Skocz do pozycji: 1.

Tytuł:

Modelling of Material Flow During Incremental Forming Process on the Basis of Digital Material Representation Concept

Autorzy:

Szyndler, J.
Perzynski, K.
Madej, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/100177.pdf

Data publikacji:

2015

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

forging
numerical modelling
aluminum

Opis:

The main goal of the work is development of the multiscale numerical model of the incremental forming process for manufacturing integral elements applicable in the aerospace industry. Description of the proposed incremental forming concept based on division of large die into a series of small anvils pressed into the material by a moving roll is presented. A complex multi scale numerical model of mentioned incremental forging process based on the digital material representation (DMR) concept was developed and is also described within the paper. Finally, obtained results in the form of strain distribution are presented and compared with the outcome from conventional forging at the macro and micro scale, respectively.

Źródło:

Journal of Machine Engineering; 2015, 15, 1; 81-89
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Investigation of the Heat Transfer in Radiators for LED Light Sources Using Thermography and Numerical Modeling

Autorzy:

Szubel, M.
Basista, G.
Karkoszka, L.

Powiązania:

https://bibliotekanauki.pl/articles/114533.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

LED
radiators
thermography
numerical modelling

Opis:

Light-emitting diodes – LED, appeared on the market in the 60s of the last century, and today it is the fastest developing lighting technology. Due to high heat flux on the small surface of the individual diodes, problems related to the light source cooling become to be one of the basic ones. The paper presents results of the thermographic and numerical analyses of the chosen design of the LED lamp radiator. Experimental and computational data have been compared and discussed.

Źródło:

Measurement Automation Monitoring; 2015, 61, 6; 257-260
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Bird modelling for simulation of bird strikes

Autorzy:

Ćwiklak, J.

Powiązania:

https://bibliotekanauki.pl/articles/245094.pdf

Data publikacji:

2015

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

bird strike
simulation
numerical modelling

Opis:

As proved in the conducted analyses, one of the factors, which, to a large degree, exerts a negative influence on flight safety, is a potential possibility of a collision of an aircraft with birds, in particular at an airfield or in its vicinity [12, 16]. Various parts of an aircraft are subjected to damage. It appears that damage to the engine as well as penetration of the windshield is extremely dangerous. The consequence of a bird falling into the engine can be engine shutting down [6, 21], whereas penetrating the canopy can cause a serious injury to the pilot, making him unable to continue piloting an aircraft. The analysis of the literature of the object of study [7] shows that the most damage of the windshield occurs in the category of aircraft and small helicopters, whose certification requirements were not specified in this case [1, 19]. It should be remembered that apart from the compulsory experimental strength tests, conducted in laboratory conditions in order to meet certification requirements, there exist various theoretical methods, which are realized based on proper mathematical modelling of the strike event [5, 10]. Therefore, due to lack of certification requirements for the category of normal aeroplanes and small helicopters and a high degree of damage, especially to the cockpit canopy, it seems justified to conduct simulation of the strike impact by means of proper software. In order to perform the modelling in question, it is necessary to select a proper bird model and a suitable simulation method, including appropriate software. Based on the available literature devoted to the subject, there are several methods of modelling a bird shape. Investigations exploit various geometrical figures in order to model the bird shape, the most common one being a cylinder, an ellipsoid and a cylinder with hexagonal endings [10]. The aim of this article is to analyse the selected methods in order to choose one of them for further research connected with the simulation of bird-strike events into a cockpit windshield of selected aircraft.

Źródło:

Journal of KONES; 2015, 22, 2; 25-32
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Application of the GTN Model to Numerical Simulation of Distaloy AB Sinters Behaviour Under Complex Loading Conditions

Autorzy:

Madej, L.
Perzyński, K.
Składzień, M.
Tkocz, M.
Rosiak, M.
Grosman, F.

Powiązania:

https://bibliotekanauki.pl/articles/350850.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

numerical modelling
porous sinters
deformation

Opis:

The behaviour of porous sinters, during compression and compression with reverse cyclic torsion tests is investigated in the article based on the combination of experimental and numerical techniques. The sinters manufactured from the Distaloy AB powder are examined. First, series of simple uniaxial compression tests were performed on samples with three different porosity volume fractions: 15, 20 and 25%. Obtained data were then used during identification procedure of the Gurson-Tvergaard-Needleman finite element based model, which can capture influence of porosity evolution on plasticity. Finally, the identified Gurson-Tvergaard- Needleman model was validated under complex compression with reverse cyclic torsion conditions and proved its good predictive capabilities. Details on both experimental and numerical investigations are presented within the paper.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1937-1942
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Optimization of Steel Flow in the Tundish by Modifying its Working Area

Autorzy:

Warzecha, P.
Hutny, A. M.
Warzecha, M.
Merder, T.

Powiązania:

https://bibliotekanauki.pl/articles/354772.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

tundish
continuous casting
numerical modelling

Opis:

Presented paper describes model investigations carried out on six-strand continuous casting tundish. Numerical analysis is based on simulations performed with the use of commercial code ANSYS Fluent. The analysis concerns determination of hydrodynamic conditions of the flow in the analysed tundish, with nominal capacity of 22 Mg, and its optimisation by modification of the flow structure in the tundish working area. Four different flow control devices (FCD) were proposed. Results of investigations presented in the paper include the distribution of velocity vectors and distribution of temperature and turbulence kinetic energy. Additionally, for more detailed comparative analysis, the macroscopic characteristics of residence time distribution (RTD) in the reactor, and the transition zone ranges were determined for each of the variants.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 4; 2071-2078
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Modelling and Experimental Testing of Hybrid Joints Made of: Aluminium Adherends, Adhesive Layers and Rivets for Aerospace Applications

Autorzy:

Sadowski, T.
Golewski, P.

Powiązania:

https://bibliotekanauki.pl/articles/356712.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

hybrid joints
numerical modelling
experiments

Opis:

The contemporary demands in different branches of engineering require application of new multi-component materials and structural systems. Appropriately chosen joining technology can offer significant enhancement of structural system performance in terms of effectiveness, reliability, safety and other design criteria. The modern applications of complex joints are of great technological interest as they permit to combine and to enhance the individual effects of each kind of joint. This is of great importance for modern applications in different branches of engineering: aerospace, mechanical and civil. Therefore in this paper we will focus on the analysis of mechanical response of adhesive joint of aluminium strips reinforced by rivets. The aim of the paper is to investigate experimentally the mechanical behaviour of adhesive joint of aluminium strips reinforced by rivets for industrial applications in aerospace. The considered joint was subjected to uniaxial loading. The tests in this paper were performed for: • classical adhesive joint in order to investigate material parameters for numerical modelling of the hybrid joint • hybrid joining of the structural elements in order to investigate the reinforcement effect. The experiments with application of digital image ARAMIS system allowed for on-line monitoring of the deformation process of the considered joining elements. The particular distributions of displacement fields at the joint surface were estimated for any stage of loading process. Numerical modelling was performed for experimentally investigated specimens. The materials parameters, necessary for calculation, were estimated from experiments. FEA modelling was done with the help of ABAQUS code.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1577-1583
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Analysis of the inadequacy of determining the spectral characteristics of optical fibre periodic structures by way of numerical modelling

Autorzy:

Stępniak, Piotr
Kisała, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/221086.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

numerical simulations
fibre Bragg grating
numerical modelling

Opis:

As part of the work, the error level of simulations of uniform optical-fibre Bragg gratings was determined using the transition matrix method. The errors were established by comparing the transmission characteristics of the structures obtained by simulation with the corresponding characteristics arrived at experimentally. To compile these objects, elementary properties of the characteristics were specified, also affecting the applications of Bragg gratings, and compared with each other. The level of error in determining each of these features was estimated. Relationships were also found between the size of the physical properties of Bragg gratings and the level of errors obtained. Based on the findings, the correctness of the simulation of structures with the said method was verified, giving satisfying results.

Źródło:

Metrology and Measurement Systems; 2020, 27, 1; 33-50
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Modelling of vibration with absorber

Autorzy:

Vondřich, J.
Thöndel, E.
Jirku, S.

Powiązania:

https://bibliotekanauki.pl/articles/99605.pdf

Data publikacji:

2010

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

numerical modelling
Simulink
vibration
machine
absorber

Opis:

Machine vibration occurs as a result of unbalanced revolving masses, loading forces and moments, starting and coasting of driving motors and other effects. We try to eliminate these undesirable vibrations by suitable mounting of the mechanical system. Another possibility of suppression of the vibration machine is to use an absorber. A model of a vibration mechanical system with a vibration absorber is presented in the paper. The model consists of a fixed-end vibrating beam with primary vibrating mass M and with stiffness K and damping B. The harmonic force F with frequency ? and amplitude A acts on the primary mass M as well as on the beam with stiffness k and damping b, where the secondary mass m of the absorber is mounted. The task of the absorber is to minimize the movement of the mass M. A model (Fig. 1) has two degrees of freedom X and x. Two equations describe the movement of the primary mass M and the secondary mass m of the absorber. The model is solved first numerically by using Simulink. In numerical solution it is possible to set up parameters of the mechanical system with respect to the vibration reduction. According to the mechanical requirements for the mechanical system (output trajectory, velocity, forces and torques acting on the individual parts of the system), it is also possible to design input parameters (driving torques and other parameters of the mechanical system). A experimental model will be designed in order to verify results, where a voice-coil will be used as the actuator of the force F Numerical and experimental model allows changing parameters i.e. masses M and m, length L and l of the beams and frequency ? of the excitation force F. The results from the numerical solution are then possible to compare with the measured values of the experimental model. It is assumed that the experimental model will be equipped with accelerometers enabling the measuring of vibration, which will be placed on the masses M and m.

Źródło:

Journal of Machine Engineering; 2010, 10, 4; 100-105
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Numerical modelling of a test embankment on soft ground

Autorzy:

Gabryś, K.

Powiązania:

https://bibliotekanauki.pl/articles/115485.pdf

Data publikacji:

2012

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

numerical modelling
embankment construction
soft soil

Opis:

The construction of an embankment situated on soft subsoil with a high groundwater level leads to a rise in pore pressure. This “undrained behaviour” can made the effective stress to remain low and intermediate consolidation periods to be adopted so that the construction of the embankment is safe. During a consolidation process the dissipation of the excess pore pressure is observed in order to increase the shear strength of the soil to continue the construction process [4]. The behaviour of a test embankment founded on a soft soil in Warsaw, on the Ursynowska Scarp, in the Campus SGGW (Warsaw University of Life Sciences) site was simulated with a use of a finite element analysis [6]. This study presents an experimental work, a construction of a flood-control embankment on organic soil represented by peat. The modelling of an embankment behaviour is carried out by the program PLAXIS (Finite Element Code for Soil and Rock Analysis). Measurements were taken of pore pressure, dissipations rates and displacements in the foundation peat. Predictions of these were made using a simple Soft Soil Model. Moreover, the calculation of the safety factor, the eff ect of the drains on the consolidation process and an update mesh analysis were investigated. The results suggest the signifi cant impact of drains on the speed of the consolidation course. The commonly accepted Mohr-Coulomb Model and Soft Soil Model, which involve typical parameters obtained from in-situ and laboratory testing, can be successfully selected for examination the behaviour of fl ood-control embankment situated on soft soils. The Updated mesh and Updated water pressure analysis reduces the settlements and allows for a more realistic study of settlements, while the positive effects of large deformations is considered. However, there is a great need to compare the numerical simulation with the real existing embankments located on problematic soils.

Źródło:

Challenges of Modern Technology; 2012, 3, 2; 37-43
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Optimal selection of numerical models for flood embankment pore pressure and temperature data

Autorzy:

Chuchro, M.
Dwornik, M.
Szostek, K.
Leśniak, A.

Powiązania:

https://bibliotekanauki.pl/articles/305609.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

flood embankmnet
numerical modelling
time series

Opis:

The aim of the ISMOP project is to study processes in earthen flood embankments: water filtration, pore pressure changes, and temperature changes due to varying water levels in the riverbed. Developing a system for continuous monitoring of flood embankment stability is the main goal of this project. A full-size earthen flood embankment with built-in sensors was built in Czernichow and used to conduct experiments involving the simulation of different flood waves, with parameters mostly measured at time intervals of 15 minutes. Numerical modelling—in addition to providing information about phenomena occurring in the embankment due to external factors and changes in water level—could be used to assess the state of the embankment. Modelling was performed using Itasca Flac 2D 7.0 with an assumed grid cell size of 10x10 cm. The water level in the embankment simulated the water flow in the Wisła River and the temperature of the air and water. Data about the state of the flood embankment was exported every hour. Using numerical models and real experiment data, a model-driven module was used to perform comparisons. Analyses of each half-section of the flood embankment were carried out separately using similarity measures and an aggregate window. For the tests, the North-West (NW) half cross-section of the embankment was chosen, which contains pore pressure and temperature sensors UT6 to UT10. The water level in the embankment was raised to a height of 3m; the best numerical model was considered the one that best matched the actual data recorded by the sensors during the experiment. The experiment period was from 9pm on 29/08/2016 to 9am on 03/09/2016. Seventeen numerical models of the water level rising to 2, 3, and 4 meters were compared against real experimental data from the NW half cross-section. The first step was to verify the similarity between the incoming data from the sensors. If the correlation value exceeded 0.8, the data from the sensors was averaged. The experimental data was then compared against the numerical models using least absolute deviations L1-Norm. The L1-Norm varied from 26 to 32, depending on window length and the numerical model used.

Źródło:

Computer Science; 2017, 18 (4); 399-412
1508-2806
2300-7036

Pojawia się w:

Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Hydrodynamic conditions of flow in the tundish depending on selected technological parameters for different steel groups

Autorzy:

Warzecha, M.
Merder, T.
Warzecha, P.
Hutny, A. M.

Powiązania:

https://bibliotekanauki.pl/articles/353743.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steelmaking
continuous casting
tundish
numerical modelling

Opis:

The presented results of investigations are part of a larger study focused on the optimization of the flow and mixing of liquid steel in the industrial tundish of continuous casting machine. The numerical simulations were carried out concern the analysis of hydrodynamic conditions of liquid steel flow in a tundish operating in one of the national steelworks. Numerical simulations were performed using the commercial code ANSYS Fluent. The research concerns two different speeds of steel casting. In real conditions, these speeds are the most commonly used in the technological process when casting two different groups of steel. As a result of computational fluid dynamics (CFD) calculations, predicted spatial distributions of velocity and liquid steel turbulence fields and residence time distribution (RTD) curves were obtained. The volume fractions of different flows occurring in the tundish were also calculated. The results of the research allowed a detailed analysis of the influence of casting speed on the formation of hydrodynamic conditions prevailing in the reactor.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 65-70
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Numerical modelling of engineering soil shell structure

Autorzy:

Surowiecki, A.
Machelski, C.
Saska, P.

Powiązania:

https://bibliotekanauki.pl/articles/348469.pdf

Data publikacji:

2016

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

numerical modelling
engineering
soil
shell structure

Opis:

The purpose of this article is to provide examples of models used in ground and shell design in engineering facilities made using corrugated sheets, such as roads and rail. Despite the small size of culverts designed for transport use, sophisticated computational models are applied to faithfully reproduce them. To calculate internal forces and dis-placements resulting from the utility load, spatial 3D models with a very large number of elements are used. The paper discusses simplified 2D models allowing to accurately represent an object and its operation. The focus is on discussing three ways of discretization of a shell in the form of: corrugated metal, rod mesh and orthotropic shell.

Źródło:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2016, 4; 161-169
1731-8157

Pojawia się w:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Profile design of noncircular belt pulleys

Autorzy:

Krawiec, P.
Marlewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/281025.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

reverse engineering
tooth profile
numerical modelling

Opis:

During design of the envelope of a noncircular belt pulley one should take into account several conditions resulting from kinematics and geometry of the uneven-running strand transmission. Design of proper values of pitches for a belt pulley, which enable good cooperation between the belt pulley and the belt, should be carefully done. In available Polish literature and catalogues offered by belt manufacturers, one can find only detailed dimensions of belts with a trapezoidal profile. Information on other profiles is insufficient for full description of geometrical features of belt pulley teeth as well as to design tools for machining belt pulleys. Manufacturers of belt pulleys and belts give only necessary data to submit a purchase order. The paper presents a digitization process (scanning) of geometry of the envelope of circular belt pulleys with non-standard profiles; this scanning has been done with the application of coordinate measuring machines. The obtained information on geometrical features of tooth profiles has been numerically analysed. As a result of this analysis, the mathematical description has been obtained. Finally, noncircular belt pulleys with different tooth profiles have been designed and manufactured.

Źródło:

Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 561-570
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Modelling of small river deltas : the dependence of morphology on grain size and discharge

Autorzy:

Witek, P.
Czechowski, L.
Misiura, K.

Powiązania:

https://bibliotekanauki.pl/articles/2060519.pdf

Data publikacji:

2016

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

hydrology
sedimentology
river deltas
numerical modelling

Opis:

We studied the dependence of the morphology of small river deltas on the grain size, the total discharge, and the slope of the deposits. We use Computational Fluid Dynamics (CFD) methods of numerical modelling. For all models we used the same initial geometry of the river valley and a portion of the lake. Our simulations show the expected dependence of the shape of our simulated small deltas on the grain size. Moreover, we find that the final type of delta could be characterized by the average slope in the region close to the delta front.

Źródło:

Geological Quarterly; 2016, 60, 4; 975--980
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Numerical Model of Large-Scale Levitation Melting Process

Autorzy:

Golak, S.
Panic, B.

Powiązania:

https://bibliotekanauki.pl/articles/353756.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

levitation melting
reactive metals
numerical modelling

Opis:

The levitation melting has a potentially wide range of applications, especially in the processing of reactive metals whose contact with the crucible material causes their contamination and damage to the crucible itself. Despite its advantages, levitation melting, already proposed in the 1920s, has not yet found significant use in industrial conditions. This is due to the nature of the electromagnetic field used in previously developed devices. The disappearance of this field in the system axis causes overcoming, in the case of larger charges, surface tension forces and metal leakage from the device. The article contains a comparative analysis of a conventional solution and a newly developed levitation melting device, whose completely different design eliminates the previous weight limit of the charge.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 627-632
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Computer Aided Development of the Innovative Incremental Forming Process

Autorzy:

Szyndler, J.
Madej, Ł.
Grosman, F.

Powiązania:

https://bibliotekanauki.pl/articles/99760.pdf

Data publikacji:

2014

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

incremental forming
integral elements
numerical modelling

Opis:

Computer aided design of innovative incremental forming process dedicated to manufacturing integral elements for aerospace industry is the main aim of the present work. Description of the proposed incremental forging idea as well as details of the developed numerical models are presented within the paper. First, a simple model of a single anvil indentation was created to evaluate material behaviour under different pressing depths. Then a complete numerical model of developed incremental forming press was proposed. Finally, obtained results in the form of strain distribution and recorded forging loads are presented and compared with results from conventional forming model.

Źródło:

Journal of Machine Engineering; 2014, 14, 1; 84-93
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Isotropic damage in viscoplastic flow conditions, FEM applications with practical examples

Autorzy:

Kłosowski, P.
Pyrzowski, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/243317.pdf

Data publikacji:

2008

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

FEM
viscoplacticity
isotropic damage
constitutive modelling
numerical modelling

Opis:

The damage mechanics is a very important branch of solid mechanics. Although it is still developing, it has already been applied to many engineering problems. Among many various types of damage models, which are commonly used, the main subject of this paper is the isotropic continuous damage in viscoplastic flow conditions. This paper include Information about the viscoplastic type of constitutive modelling, the presentation of mechanical representation of damage by the scalar variable D, effective stress concept, equations of the chosen isotropic damage model, the Chaboche viscoplastic constitutive model including damage effects and the identification procedure of damage material parameters with practical example. The chosen constitutive model is easy to apply to the finite element analysis. Using the MSC.Marc system, which great advantage is possibility ofa user subroutine application, the geometry nonlinear finite element analysis of plate and shell structures including damage is possible. This paper includes description of the applied program and user subroutines applied: UVSCPL - viscoplastic modelling (the standard MSC.Marc system supports the Chaboche model, but not in the damage variant) and UACTIV - deactivation of finite elements. The last part of the paper includes the practical numerical example of a clamped bar of 0.3 m long and 0.1x0.01 m cross-section size. In calculations the four-node thin-shell, divided into five layers, elements were used. dynamic, geometrically nonlinear analysis using Newmark integration algorithm has been performed. As the results, screen shots of displacements with maps of damage parameter for the bar infour time moments are presented.

Źródło:

Journal of KONES; 2008, 15, 1; 127-136
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Numerical Analysis of the Structure of Liquid Flow in the Tundish with Physical Model Verification

Autorzy:

Merder, T.

Powiązania:

https://bibliotekanauki.pl/articles/352430.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steelmaking
continuous casting
tundish
numerical modelling
physical modelling

Opis:

Detailed studies of the movement of liquid steel (hydrodynamics) on a real object are practically impossible. The solution to this problem are physical modelling carried out on water models and numerical modelling using appropriate programs. The method of numerical modelling thanks to the considerable computing power of modern computers gives the possibility of solving very complex problems. The paper presents the results of model tests of liquid flow through tundish. The examined object was model of the twonozzle tundish model. The ANSYS Fluent program was used to describe the behavior of liquid in the working area of the tundish model. Numerical simulations were carried out using two numerical methods of turbulence description: RANS (Reynolds-Averaged Navier-Stokes) – model k-ε and LES (Large Eddy Simulation). The results obtained from CFD calculations were compared with the results obtained using the water model.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1895-1901
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Numerical Analysis of Shock Initiation on Highly Energetic Material LX-04

Autorzy:

Cichocki, Maciej K.
Sokołowski, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/403640.pdf

Data publikacji:

2020

Wydawca:

Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego

Tematy:

numerical modelling
finite element method
shock initiation

Opis:

The paper presents investigation of shock initiation effects on highly energetic material LX-04, an HMX based one, by a blunt brass projectile using numerical modelling methods implemented in LS-DYNA software. Multi – Material Arbitrary Lagrangian Eulerian (MM-ALE) formulation has been used to provide the possibility of fulfilment of the elements with multiple materials accordingly to multiple phases of the composition detonated. The work is focused on LS-DYNA’s equation of the state keyword *EOS_IGNITON_AND_GROWTH_IN_HE. Proper comparison with experimental data is presented. The introduction into the subject of highly nonlinear transient dynamic finite element analysis, possibilities, and superiority of this kind of modelling are being discussed. Reasons of sustaining the need of data by numerical solutions rather than experimental handling in military applications are given. Some of typical technical issues, occurring during such a fast-performing phenomenon, and the need of experimental validation of the models are typed together with detonation-state determination’s observation capabilities.

Źródło:

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2020, 11, 2 (40); 57-66
2081-5891

Pojawia się w:

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Numerical Modelling of Metal Melt Refining Process in Ladle with Rotating Impeller and Breakwaters

Autorzy:

Sviželová, J.
Tkadlečková, M.
Michalek, K.
Walek, J.
Saternus, M.
Pieprzyca, J.
Merder, T.

Powiązania:

https://bibliotekanauki.pl/articles/353863.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminium
refining
numerical modelling
rotating impeller
degassing

Opis:

The paper describes research and development of aluminium melt refining technology in a ladle with rotating impeller and breakwaters using numerical modelling of a finite volume/element method. The theoretical aspects of refining technology are outlined. The design of the numerical model is described and discussed. The differences between real process conditions and numerical model limitations are mentioned. Based on the hypothesis and the results of numerical modelling, the most appropriate setting of the numerical model is recommended. Also, the possibilities of monitoring of degassing are explained. The results of numerical modelling allow to improve the refining technology of metal melts and to control the final quality under different boundary conditions, such as rotating speed, shape and position of rotating impeller, breakwaters and intensity of inert gas blowing through the impeller.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 659-664
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Numerical Modeling of Copper Reduction in Fire Refining Process

Autorzy:

Kolczyk, E.
Miczkowski, Z.
Czernecki, J.

Powiązania:

https://bibliotekanauki.pl/articles/354138.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

numerical modelling
copper reduction
anode furnace
tuyere

Opis:

Copper reduction represents one of the steps in the process of fire refining of blister copper. Process of copper reduction with natural gas as performed in the anode furnace was modeled. Numerical analysis was conducted using the IPSA (Inter- Phase-Slip Algorithm) module of PHOENICS package and standard turbulent model k - ε. The model takes into account the liquid phase - slag and phase of natural gas which is supplied through the tuyere from the bottom of the charge. Calculations were made for two different diameters of tuyeres for supply of reducer. Based on the calculations and analysis, it was found out that the gas flow which causes strong movement in the bath guarantees homogeneous composition of the liquid copper in each process stage. Application of a tuyere with a larger diameter results in a greater intensity of the reduction process and better use of the reducer.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 521-528
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

The effect of notch depth on CTOD values in fracture tests of structural steel elements

Autorzy:

Kowalski, J.
Kozak, J.

Powiązania:

https://bibliotekanauki.pl/articles/258854.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

brittle fracture
CTOD
numerical modelling
laboratory tests

Opis:

In elements of steel structures working at low temperatures, there is a risk of appearance of brittle fracture. This risk is reduced through the use of certified materials having guaranteed strength at a given temperature. A method which is most frequently used to determine brittle fracture toughness is the Charpy impact test, preformed for a given temperature. For offshore structures intended to work in the arctic climate, the certifying institutions more and more often require Crack Tip Opening Displacement (CTOD) tests instead of conventional impact tests, especially for steel and welded joints of more than 40 mm in thickness in the case of high-strength steel, and more than 50 mm for the remaining steels. The geometry of specimens and the test procedure are standardised; however, these standards provide some margin for specimen notch depth. The paper analyses the effect of notch depth difference, within the range permitted by the standards, on the recorded CTOD values of a given material. The analysis was performed via numerical modelling of destruction of specimens with different notch geometries and further verification of the obtained numerical results in laboratory tests. The calculations were carried out at the Academic Computer Centre in Gdansk.

Źródło:

Polish Maritime Research; 2018, 2; 85-91
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Methods for description of the total field propagation in the irregular dielectric waveguides

Autorzy:

Bekker, E.V.
Romanova, E.A.
Marciniak, M.

Powiązania:

https://bibliotekanauki.pl/articles/308366.pdf

Data publikacji:

2001

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

optical waveguides
numerical modelling
beam propagation methods

Opis:

Numerical and semi-analytical methods useful for analysis of the total field propagation in dielectric waveguides with sharp and smooth discontinuities are reviewed. The efficiency of these methods to model the field propagation in such structures is discussed comparatively. As an example, spatial transient regime of the radiation field propagation in planar step-index waveguide excited by a Gaussian beam is simulated numerically by two different beam propagation methods.

Źródło:

Journal of Telecommunications and Information Technology; 2001, 2; 64-71
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Laser-Assisted Thermomechanical Bending of Tube Profiles

Autorzy:

Widłaszewski, J.
Nowak, M.
Nowak, Z.
Kurp, P.

Powiązania:

https://bibliotekanauki.pl/articles/355622.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

laser forming
laser-assisted bending
numerical modelling

Opis:

The subject of the work is the analysis of thermomechanical bending process of a thin-walled tube made of X5CrNi18-10 stainless steel. The deformation is produced at elevated temperature generated with a laser beam in a specially designed experimental setup. The tube bending process consists of local heating of the tube by a moving laser beam and simultaneous kinematic enforcement of deformation with an actuator and a rotating bending arm. During experimental investigations, the resultant force of the actuator and temperature at the laser spot are recorded. In addition to experimental tests, the bending process of the tube was modelled using the finite element method in the ABAQUS program. For this purpose, the tube deformation process was divided into two sequentially coupled numerical simulations. The first one was the heat transfer analysis for a laser beam moving longitudinally over the tube surface. The second simulation described the process of mechanical bending with the time-varying temperature field obtained in the first simulation. The force and temperature recorded during experiments were used to verify the proposed numerical model. The final stress state and the deformation of the tube after the bending process were analyzed using the numerical solution. The results indicate that the proposed bending method can be successfully used in forming of the thin-walled profiles, in particular, when large bending angles and a small spring-back effect are of interest.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 421-430
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Numerical methods in fluid mechanics – an overview

Autorzy:

Sobieski, Wojciech
Šarler, Božidar

Powiązania:

https://bibliotekanauki.pl/articles/22672799.pdf

Data publikacji:

2023

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

CFD
numerical modelling
mesh methods
meshless methods

Opis:

The article presents in a review way the most important numerical methods used in modern fluid mechanics. The individual chapters discuss Finite Difference Method, Finite Volume Method, Lattice Boltzmann Method, Discrete Element Method and Smoothed Particle Hydrodynamics. The aim of the article is to familiarize the reader with the most important concepts, features and mathematical equations used in particular methods. The article is intended mainly for people who want to get acquainted with the current possibilities of numerical modelling in the field of broadly understood fluid mechanics. The material is intended to facilitate the decision on how to implement the planned play research.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2023, 26(1); 185--218
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Effect of Tunnel Progress on the Settlement of Existing Piled Foundation

Autorzy:

Al-Omari, Raid Ramzi
Al-Soud, Madhat Shakir
Al-Zuhairi, Osamah Ibrahim

Powiązania:

https://bibliotekanauki.pl/articles/949855.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

numerical modelling
numerical analysis
piles
soil-structure interaction
tunnelling

Opis:

Tunnel construction below or adjacent to piles will affect the performance and eventually the stability of piles due to ground deformation resulting in the movement of piles and changes in the axial force distribution along the piles. A three dimensional finite element analysis using PLAXIS 3D (2013) was performed to study the behaviour of a single pile and 3 x 3 piles group during the advancement of shield tunnelling in ground. The 10-node tetrahedral elements were used to model both the soil and the tunnel lining. The Hardening Soil (HS) model was used to simulate the soil structure interaction at the tunnel-soil interface. An isotropic elastic model was used for the pile, piles cap, tunnel lining and tunnel boring machine shield (TBM). Several parametric studies were attempted including the longitudinal, lateral, and vertical tunnel location relative to pile embedded in different types of soil (clay or sand). The results showed that the pile head settlement increases during the tunnelling advancement in larger values than that for ground surface settlement. A zone of influence was determined in the range of twice the tunnel diameter in the longitudinal direction (forward and backward of the pile), and transverse direction (left and right of the tunnel centreline). If the tunnel boring is kept off this zone then there is no fear of pile collapse.

Źródło:

Studia Geotechnica et Mechanica; 2019, 41, 2; 102-113
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Application of High Flow Rate Gas in the Process of Argon Blowing Trough Steel

Autorzy:

Merder, T.
Pieprzyca, J.
Warzecha, M.
Warzecha, P.

Powiązania:

https://bibliotekanauki.pl/articles/351630.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ladle
high intensity gas blowing
numerical modelling
physical modelling

Opis:

The article demonstrates results of modelling research tests concerning the analysis of possibilities of blowing gas into the metal bath at high flow rates in a steel ladle with a nominal capacity of 50 Mg. Various configurations concerning of gas introduction into the steel ladle were analysed. There were considered cases of blowing into the metal bath via one, two or three purging plugs, being installed on the bottom and via additional support for blowing the gas from the top through the lance. Results obtained from the water model of the reactor were verified with the results of numerical simulations.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2A; 905-910
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Constitutive modelling of root-reinforced granular soils - preliminary studies

Autorzy:

Switala, B.
Fern, E.J.

Powiązania:

https://bibliotekanauki.pl/articles/887535.pdf

Data publikacji:

2018

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

soil
constitutive modelling
root reinforcement
granular soil
numerical modelling

Źródło:

Scientific Review Engineering and Environmental Sciences; 2018, 27, 2[80]
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Load capacity of the mixed bench and slab foundation. Numerical simulations and analytical calculation model

Autorzy:

Grodecki, Michał

Powiązania:

https://bibliotekanauki.pl/articles/1845166.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

bench foundation
slab foundation
load capacity
numerical modelling

Opis:

The paper presents results of a numerical investigation on load capacity of the mixed bench and slab shallow foundations (often used in the process of the modernization of the old, antique buildings, which are suffering from lack of the load capacity). The main trouble with use of existing analytical approaches is a non-unique foundation level of the bench and slab, they could even be founded on different geotechnical layers. Proposed analytical model based on Brinch Hansen (EC-7) approach could deal with such a problem. Results of 2D and 3D numerical modelling (ultimate load of the foundation) are compared to the obtained by using the proposed approach. Influence of the soil above the foundation level is also investigated. Different width to length ratios of the foundation are analyzed (from "short" to "long" foundations). Usability of the proposed analytical model in engineering practice is proved by numerical simulations; the obtained results are on the safe side with quite acceptable margin of additional safety.

Źródło:

Studia Geotechnica et Mechanica; 2021, 43, 2; 135-141
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Impact of mesh quality on the numerical estimation of saturated water conductivity of pore media

Autorzy:

Gackiewicz, B.
Lamorski, K.
Slawiński, C.
Hsu, S.-Y.
Chang, L.-C.

Powiązania:

https://bibliotekanauki.pl/articles/2082923.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

porous media
numerical modelling
hydraulic
conductivity
mesh accuracy

Opis:

The numerical modelling of transport phenomena in porous media often requires a compromise between grid precision and the accuracy of simulation results. This study demonstrates the impact of errors on the accuracy of the reproduction of the actual pore space by the numerical grid on the estimated values of the saturated water conductivity. Four types of computational grids with varying levels of complexity were prepared for each of the 12 tomographic images of the porous specimens. The specific surfaces and total porosities were calculated for each of the meshes and compared with those parameters calculated for binarized tomographic images. Simulations of steady flow were performed on the computational grids, and the saturated water conductivity values were calculated. It has been shown that an insufficiently accurate mesh only reproduces the largest pore spaces in the analysed sample, which most often leads to an underestimation of the water conductivity coefficient. The following criterion for the optimal accuracy of the computational grid is proposed, it is based on the voxel size of the tomographic images of the porous media: the minimum size of the cell in the mesh used for simulations has to be at most two times the size of the voxel used in the tomographic scans of the porous medium.

Źródło:

International Agrophysics; 2020, 34, 4; 473-483
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Optimization of a thin-walled element geometry using a system integrating neural networks and finite element method

Autorzy:

Golewski, P.
Gajewski, J.
Sadowski, T.

Powiązania:

https://bibliotekanauki.pl/articles/351314.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

artificial neural networks
numerical modelling
thin-walled element

Opis:

Artificial neural networks [ANNs] are an effective method for predicting and classifying variables. This article presents the application of an integrated system based on artificial neural networks and calculations by the finite element method [FEM] for the optimization of geometry of a thin-walled element of an air structure. To ensure optimal structure, the structure’s geometry was modified by creating side holes and ribs, also with holes. The main criterion of optimization was to reduce the structure’s weight at the lowest possible deformation of the tested object. The numerical tests concerned a fragment of an elevator used in the “Bryza” aircraft. The tests were conducted for networks with radial basis functions [RBF] and multilayer perceptrons [MLP]. The calculations described in the paper are an attempt at testing the FEM - ANN system with respect to design optimization.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 435-442
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Study of Solidification of Continuously Cast Steel Round Billets Using Numerical Modellin

Autorzy:

Tkadleckova, M.
Válek, L.
Socha, L.
Saternus, M.
Pieprzyca, J.
Merder, T.
Michalek, K.
Kováč, M.

Powiązania:

https://bibliotekanauki.pl/articles/353911.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steel
billet
continuous casting
numerical modelling
metallurgical length

Opis:

The paper is dedicated to the verification of solidification of continuously cast round steel billets using numerical modelling based on the finite element method. The aim of numerical modelling is to optimize the production of continuously cast steel billets of round format. The paper describes the pre-processing, processing and post-processing phases of numerical modelling. Also, the problems with determination of the thermodynamic properties of materials and the heat transfer between the individual parts of the casting system, including the definition of the heat losses along the casting strand in the primary and secondary cooling, were discussed. The first results of numerical simulation show the so-called thermal steady state of continuous casting. The temperature field, the metallurgical length and the thickness of the shell at the end of the mould were predicted. The further research will be concentrated on the prediction the risk of the cracks and the porosity based on the different boundary conditions.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 1; 221-226
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

The Influence of the Use of Fasteners with Different Stiffness in Hybrid Joints Subjected to Complex Mechanical Loads

Autorzy:

Sadowski, T.
Nowicki, M.
Golewski, P.

Powiązania:

https://bibliotekanauki.pl/articles/354292.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

hybrid joining
fasteners
adhesive
mechanical loads
numerical modelling

Opis:

To this day, most of the papers related to hybrid joints were focused on single and double lap joints in which shear deformation and degradation was the dominant phenomenon. However, in real constructions, complex state of loads can be created by: a) torsion with shear, b) bending with shear, c) torsion with tensile. Analytical and numerical computation for simple mechanical joints is known, however, the introduction of an adhesive layer to this joint makes the load transferred both through: (1) the adhesive and (2) mechanical fasteners. There is also an interaction between the amount and stiffness of mechanical fasteners and the strength of the adhesive layer. The paper presents the results of numerical calculations for the bending with shear type of load for the hybrid structural joint and corresponding simple joints by: (1) pure adhesion and (2) rivets with different quantity maintaining the same cross-sectional area. A total of 9 simulations were performed for: (1) 4 types of pure rivets connections, (2) pure adhesive joint and (3) 4 kinds of hybrid joints. The surface-based cohesive behavior was used for creation of the adhesive layer, whereas the rivets were modelled by connector type fasteners, which simplify complexity of the numerical model. The use of connectors allowed for effort assessment taking into account damage in both types of connections. Application of connector elements can be useful for larger structures modelling, e.g. aircraft fuselage, where the number of mechanical joints is significant and complex load conditions occur.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 4; 1263-1268
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

The Effect of Thermophysical Parameters on Temperature Distribution in the Primary Cooling Zone

Autorzy:

Miłkowska-Piszczek, K.

Powiązania:

https://bibliotekanauki.pl/articles/958194.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

continuous casting of steel
enthalpy
numerical modelling
ProCAST

Opis:

The values of thermophysical properties obtained from the experimental research, and those that were calculated with thermodynamic databases, are crucial parameters which were used in the numerical modelling of the steel solidification process. This paper presents the results of research on the impact of specific heat and enthalpy, along with the method of their implementation, on temperature distribution in the primary cooling zone in the continuous steel casting process. A cast slab – with dimensions of 1100 mm and 220 mm and a S235 steel grade – was analysed. A mould with a submerged entry nozzle (SEN), based on the actual dimensions of the slab continuous casting machine, was implemented. The research problem was solved with the finite element method using the ProCAST software package. Simulations were conducted using the “THERMAL + FLOW” module.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 4; 2079-2082
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Application of Gillespie algorithm for simulating evolution of fitness of microbial population

Autorzy:

Gil, Jarosław
Polański, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/38433970.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

clonal evolution
mutation waves
yeast evolution
numerical modelling

Opis:

In this study we present simulation system based on Gillespie algorithm for generating evolutionary events in the evolution scenario of microbial population. We present Gillespie simulation system adjusted to reproducing experimental data obtained in barcoding studies – experimental techniques in microbiology allowing tracing microbial populations with very high resolution. Gillespie simulation engine is constructed by defining its state vector and rules for its modifications. In order to efficiently simulate barcoded experiment by using Gillespie algorithm we provide modification – binning cells by lineages. Different bins define components of state in the Gillespie algorithm. The elaborated simulation model captures events in microbial population growth including death, division and mutations of cells. The obtained simulation results reflect population behavior, mutation wave and mutation distribution along generations. The elaborated methodology is confronted against literature data of experimental evolution of yeast tracking clones sub-generations. Simulation model was fitted to measurements in experimental data leading to good agreement.

Źródło:

Applied Computer Science; 2022, 18, 4; 5-15
1895-3735
2353-6977

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Contribution of numerical modeling to the study of historical structures
Znaczenie modelowania numerycznego dla badań konstrukcji historycznych

Autorzy:

Roca, P.

Powiązania:

https://bibliotekanauki.pl/articles/217696.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Konserwatorów Zabytków

Tematy:

modelowanie numeryczne
konstrukcja historyczna
numerical modelling
historical structure

Opis:

The paper presents a discussion on the possibilities offered by structural analysis, based on numerical simulation, to the study if structures of architectural heritage. Structural analysis can significantly contribute, when used in combination with inspection, historical research and monitoring, to obtain conclusions on the diagnosis and, safety evaluation and take decision on the design of intervention. Some reflections are also provided on the way structural modelling is to be used to grant reliable results. Concerning the application of structural models, the three phases corresponding to (1) input data preparation, (2) calibration or validation and (3) use of models for prediction, are discussed.
Artykuł dotyczy omówienia możliwości, jakie daje analiza strukturalna, oparta na symulacji liczbowej w dziedzinie badań konstrukcji dziedzictwa architektury. Analiza strukturalna może być bardzo przydatna, jeśli łączy się ją z badaniami empirycznymi, historycznymi i monitoringiem, aby opracować wnioski na temat diagnozy i oceny bezpieczeństwa oraz decyzji o projekcie interwencji. Autorzy zawarli także pewne refleksje na temat modeli strukturalnych, dzięki którym można uzyskać wiarygodne wyniki. Jeśli chodzi o stosowanie modeli strukturalnych, omówiono trzy fazy, odpowiadające (1) przygotowaniu danych wejściowych, (2) kalibracji lub uwiarygodnieniu (3) zastosowaniu modeli do prognozowania.

Źródło:

Wiadomości Konserwatorskie; 2009, 26; 207-217
0860-2395
2544-8870

Pojawia się w:

Wiadomości Konserwatorskie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Efektywne zastosowanie modelowań numerycznych w sejsmologii górniczej
Effective use of numerical modelling in mining seismology

Autorzy:

Danek, T.
Leśniak, A.
Pięta, A.

Powiązania:

https://bibliotekanauki.pl/articles/186503.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG

Tematy:

modelowanie numeryczne
sejsmologia górnicza
mining seismology
numerical modelling

Opis:

W artykule przedstawiono metodę modelowania pełnych, sejsmicznych obrazów falowych, głównie pod kątem ich wykorzystania w sejsmice górniczej i sejsmologii. Postęp w tych dziedzinach miał miejsce dzięki dynamicznemu rozwojowi metod informatycznych i numerycznych. Zasadnicze znaczenie ma tu możliwość prowadzenia modelowań numerycznych w rozproszonych, heterogenicznych środowiskach obliczeniowych oraz w innych architekturach równoległych. W artykule przedstawiono efektywny algorytm numeryczny do modelowań pola falowego oraz dwie podstawowe metody jego implementacji w równoległych środowiskach komputerowych (metody dekompozycji trywialnej i domenowej). Zaprezentowano również przykład modelowań numerycznych dla rejonu LGOM oraz dyskusję efektywności obliczeń tego typu w zmieniających się co do wielkości heterogenicznych klastrach komputerów.
The article features a method of modelling full seismic wave pictures in order to use them in mining seismics and seismology. The progress in this area was possible thanks to dynamically developing information and numerical methods. Here it is essential to have the possibility to carry out numerical modelling in distributed, heterogenic computing environments and other parallel architectures. The article presents an effective numerical algorithm of the wave field modelling along with two basic methods of its implementation in parallel computing environments (trivial decomposition and domain decomposition methods). Additionally, the authors presented an example of numerical modelling for the LGOM area and discussed the effectiveness of such computing in the computer clusters which change with respect to heterogenic quantities.

Źródło:

Mechanizacja i Automatyzacja Górnictwa; 2010, R. 48, nr 11, 11; 18-24
0208-7448

Pojawia się w:

Mechanizacja i Automatyzacja Górnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Modelling of the system for cleaning up free oil products with the application of the MARS simulator

Autorzy:

Knez, J.
Knez, D.

Powiązania:

https://bibliotekanauki.pl/articles/298761.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

LNAPL
numerical modelling
remediation
oil product
extraction wells

Opis:

Nowadays one of the most important problems in environmental protection is the pollution of groundwater by derivative products of oil. A common case of the infiltration of the oil derivative products to the ground water system is mainly connected with accidental oil spills in various types of environmental conditions. In this case we encounter numerous types of problems connected especially with the pollution in: 1) aeration zones, 2) saturation zones. The first step is a conceptual model for the proper recognition of the type and scale of the problem. After making a conceptual model it is possible to take a preliminary decision to recognize what sort of pollution is the source of the environmental problem. A study example describes modeling of free products of oil (LNAPL) floating on the groundwater table using MARS (Multiple Areal Remediation Simulator). The multiphase model was made on the basis of theoretical model concepts. In the modeling the recovery and migration of LNAPL are simulated, and the recoverable and residual spill volumes of derivate products of oil are estimated. Modeling indicates the best location of the remediation system and the pumping wells. Additionally, modelling can be applied to manage the remediation system for improving the efficiency and for decreasing the catchment area of piezometers and wells.

Źródło:

AGH Drilling, Oil, Gas; 2013, 30, 2; 327-332
2299-4157
2300-7052

Pojawia się w:

AGH Drilling, Oil, Gas

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Estymacja przedziału niepewności aproksymacji dyskretnej nieustalonego zagadnienia wentylacji pomieszczenia mieszkalnego
Estimation of the discretization uncertainty of an unsteady ventilation problem in a habitable room

Autorzy:

Kołodziejczyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/387423.pdf

Data publikacji:

2010

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

wentylacja
aproksymacja
modelowanie numeryczne
ventilation
aproximation
numerical modelling

Opis:

Praca poświęcona jest oszacowaniu przedziału niepewności aproksymacji dyskretnej nieustalonego zagadnienia wentylacji pomieszczenia mieszkalnego. Obliczenia numeryczne przeprowadzono z wykorzystaniem programu ANSYS-CFX. Szczegółowa analiza wykazała, że ich wyniki znajdują się poza przedziałem zbieżności asymptotycznej. Na ich przykładzie zbadano przydatność istniejących metod weryfikacji w różny sposób uwzględniających nieasymptotyczność rozwiązań. Przedział niepewności wyznaczono dla przyjętego poziomu ufności 0.95.
This article presents a study of estimation of the numerical uncertainty due to discretization of an unsteady ventilation problem in a habitable room. The numerical results are obtained with the code ANSYS-CFX. Careful considerations are given to selection of the verification procedure for the results being outside the asymptotic range. The results are presented with dis- cretization error bars computed with 95% confidence.

Źródło:

Acta Mechanica et Automatica; 2010, 4, 3; 47-53
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Numerical model of bullet - barrel system
Model numeryczny układu lufa - pocisk

Autorzy:

Łazowski, J.
Małachowski, J.
Niezgoda, T.

Powiązania:

https://bibliotekanauki.pl/articles/241651.pdf

Data publikacji:

2007

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

lufa
pocisk
modelowanie numeryczne
barrel
bullet
numerical modelling

Opis:

Aktualnie, projektowanie uzbrojenia w dużej mierze opiera się na metodach analitycznych, które nie pozwalają na znaczną poprawę parametrów broni w zakresie odporności udarowej. Szczególnie istotna jest analiza dynamiki dla ruchu pocisku w lufie na stożku przejściowym i ustalenie optymalnych parametrów procesu. Na styku lufy i pocisku zachodzą bardzo złożone procesy termomechaniczne. Oddziaływanie to powoduje powstawanie na powierzchni styku ciał ciepła a w konsekwencji zmian właściwości mechanicznych. Dodatkowo charakter współpracy obu ciał obarczony jest często brakiem symetrii wynikającym między innymi z niedokładności wykonania elementów, nieodpowiednim osadzeniem pocisku w lufie oraz niejednorodnością materiałów. W skutek takiej złożoności zjawisk, której konsekwencją są np. zmienność współczynnika tarcia czy również drgania pocisku i lufy, ogólne analityczne wyznaczanie stanów naprężeń i stanów krytycznych w sposób ścisły jest niemożliwe. Jedyną skuteczną metodą może być w tym przypadku modelowanie numeryczne. W pracy przedstawiono próbę analizy stanu wytężenia powstającego podczas szybkozmiennych procesów w trakcie współpracy pocisku z lufą. Przedstawiono model numeryczny obiektów i zaprezentowano wyniki analizy w formie planów warstwicowych. Narzędziem zastosowanym do analizy był pakiet obliczeniowy LS-DYNA umożliwiający symulacje w zakresie nieliniowym z jawnym krokiem całkowania.
Currently the design process for armament equipment mostly employs very known and traditional analytical methods. But in many cases this kind of approach is not sufficient and effective, especially for gun parameters related with impact resistance. Very crucial for proper dynamic bullet movement in the barrel are geometric dimensions. In the contact areas between a bullet and a barrel appear some thermo-mechanical phenomena. Additionally, the cooperation process between these two components is encumbered because of the asymmetry caused by the inaccuracy of production process and the inhomogeneity of used materials. Finally, the mentioned reasons produce some unwanted effects like: bullet and barrel vibrations, problems with friction phenomena, etc. In such situations, the typical engineering approach in design process is unable to take into considerations all such local and very complex effects. Therefore, this paper presents is a trial of numerical methods application, which allow perform full analysis process of interaction between bullet and barrel. The models of these two bodies were developed using FE method. The numerical calculations were performed using LS-DYNA code. The main goal of the research was focused on contact problem. In the paper authors enclosed the initial results of the dynamic simulations.

Źródło:

Journal of KONES; 2007, 14, 1; 261-266
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Arch bridges under test loadings

Autorzy:

Chróścielewski, J.
Malinowski, M.
Miśkiewicz, E.

Powiązania:

https://bibliotekanauki.pl/articles/243342.pdf

Data publikacji:

2008

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

bridge
FEM
test loads
numerical modelling
arch bridges

Opis:

According to the Polish bridge design code road bridges with spans over 20 m and all railway bridges, before they are given to public usage, all require the conduction of studies during a test loading. This paper is an illustration to the experience in arch bridge test loadings of the research team of Department of Structural Mechanics and Bridge Structures from the Gdansk University of Technology. It concerns the applied computational conceptions and researches on an example of three arch bridges, built between 2005 and 2007. The presented calculations results consists the analysis of spatial construction schemes made using the finite elements method (FEM) and its comparison to the field studies. The goal of the studies is to check the correctness of the construction 's work and of the design assumptions. Arch bridges with the longest spans, visualisation of the computational model, the displacement - deflection graphs of the arch bridge construction, generating the extreme span 's deflections, results of the calculations and field dynamic measurements of the some bridges, example of computation results and field dynamic measurements during the static tests are presented in the paper.

Źródło:

Journal of KONES; 2008, 15, 1; 29-38
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Universal approach for risk identification and evaluation in underground facilities

Autorzy:

Pytel, Witold
Fuławka, Krzysztof
Pałac-Walko, Bogumiła
Mertuszka, Piotr
Kisiel, Jan
Jalas, Panu
Joutsenvaara, Jari
Shekov, Vitali

Powiązania:

https://bibliotekanauki.pl/articles/1402360.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

risk assessment
risk matrix
numerical modelling
underground laboratory

Opis:

Underground laboratories provide a unique environment for various industries and are the perfect place for developing new technologies for mining, geophysical surveys, radiation detection as well as many other studies and measurements. Unfortunately working in underground excavations is associated with exposure to many hazards not encountered in the laboratories located on the surface. Water inflow, gas burst, roof fall and even seismic hazards translate into high accident rates in the underground mining industry across the globe. Therefore, to minimise the risk of serious accidents, a lot of research investigations related to the development of effective risk assessment procedures are being carried out. One of the initiatives aimed at improving the work safety in underground laboratories in the Baltic Sea Innovation Network project implemented under the Interreg Baltic Sea Region Programme. This study presents the process of compiling a database on hazards within underground laboratories. Finally, a proposal of unification of the procedure for risk assessment, including methods for determining the likelihood and potential impact of unwanted events has been developed.

Źródło:

Mining Science; 2020, 27; 165-181
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Hydrodynamic and hydrochemical conditions in the Wda and Mątawa River catchments (NW Poland)

Autorzy:

Kachnic, J.
Kachnic, M.

Powiązania:

https://bibliotekanauki.pl/articles/2059131.pdf

Data publikacji:

2006

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

sandur aquifer
water age
groundwater chemistry
numerical modelling

Opis:

The paper focuses on the problem of groundwater "ages" in the Pleistocene aquifers of the Wda and Mątawa River catchments. Groundwater residence time in the rocky environment of sandur areas was estimated with two methods i.e.: numerical modelling along the two lines of cross-sections and an isotope method (18O, 2H, 3H) for 6 samples. Chemical parameters (TDS, Cl) confirm the general trends of enriching water mineralization along the flow path in the sandur aquifer, as well as during infiltration towards the deeper aquifers.

Źródło:

Geological Quarterly; 2006, 50, 4; 447-456
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

The numerical spatial model (3D) of geological structure of Poland- from 6000 m to 500 m b.s.l.

Autorzy:

Piotrowska, K.
Ostaficzuk, S.
Małolepszy, Z.
Rossa, M.

Powiązania:

https://bibliotekanauki.pl/articles/2065893.pdf

Data publikacji:

2005

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

deep geological structure
3D numerical modelling
Polska

Opis:

The article describes the methodology and the results of the pilot stage of a project, aimed at representing the deep geological structure of Poland from 6000 m to 500 m b.s.l. as a 3D numeric spatial model in scale 1 : 500,000, in the "1992" georeference system.

Źródło:

Przegląd Geologiczny; 2005, 53, 10/2; 961-966
0033-2151

Pojawia się w:

Przegląd Geologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Strategy of Cooling Parameters Selection in the Continuous Casting of Steel

Autorzy:

Falkus, J.
Miłkowska-Piszczek, K.

Powiązania:

https://bibliotekanauki.pl/articles/352539.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

continuous casting of steel
cooling parameters
numerical modelling

Opis:

This paper presents a strategy of the cooling parameters selection in the process of continuous steel casting. Industrial tests were performed at a slab casting machine at the Arcelor Mittal Poland Unit in Krakow. The tests covered 55 heats for 7 various steel grades. Based on the existing casting technology a numerical model of the continuous steel casting process was formulated. The numerical calculations were performed for three casting speeds - 0.6, 0.8 and 1 m min^-1. An algorithm was presented that allows us to compute the values of the heat transfer coefficients for the secondary cooling zone. The correctness of the cooling parameter strategy was evaluated by inspecting the shell thickness, the length of the liquid core and the strand surface temperature. The ProCAST software package was used to construct the numerical model of continuous casting of steel.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 1; 329-334
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Research and Development of the Solidification of Slab Ingots from Special Tool Steels

Autorzy:

Tkadlečková, M.
Michalek, K.
Gryc, K.
Socha, L.
Jonšta, P.
Saternus, M.
Pieprzyca, J.
Merder, T.

Powiązania:

https://bibliotekanauki.pl/articles/356096.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

tool steel
steelmaking
slab ingot
numerical modelling
porosity

Opis:

The paper describes the research and development of casting and solidification of slab ingots from special tool steels by means of numerical modelling using the finite element method. The pre-processing, processing and post-processing phases of numerical modelling are outlined. Also, problems with determining the thermophysical properties of materials and heat transfer between the individual parts of the casting system are discussed. Based on the type of grade of tool steel, the risk of final porosity is predicted. The results allowed to improve the production technology of slab ingots, and also to verify the ratio, the chamfer and the external/ internal shape of the wall of the new designed slab ingots.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1453-1458
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Wind influence on the formation of nearshore currents in the southern Baltic: mumerical modelling results

Autorzy:

Sokolov, A.
Chubarenko, B.

Powiązania:

https://bibliotekanauki.pl/articles/241238.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN

Tematy:

currents
waves
numerical modelling
coastal zone
Baltic Sea

Opis:

A two-dimensional numerical model was used for a simulation of vertical average longshore currents generated by both wind friction and wind-wave action in the nearshore zone. The modelling domain includes the southern part of the Baltic Proper (all boundaries were closed). Wind, uniform in space and varying in time, was the only forcing in the model. The correlation coefficient higher than 0.8 was obtained by model calibration versus the field measurements of currents conducted at the Lubiatowo field station (southern Baltic) during about 1.5 months in 2006. Comparative simulations of total currents including both wind-induced drift and wave components, and of total currents including only a wind-induced drift component, showed that the input of the drift component into currents in the nearshore zone is greater than commonly believed. Wind-induced drift strongly dominates outside the zone of wave transformation, and its input into the total resulting currents remains noticeable even in a zone between the shoreline and the depth of the first wave breaking. Thus, wind-induced drift constitutes up to 50% of the resulting longshore currents for longshore winds and no less than 20% of the longshore component of currents for winds at 45 degrees to the longshore direction.

Źródło:

Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 1-2; 37-48
1231-3726

Pojawia się w:

Archives of Hydro-Engineering and Environmental Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Theoretical and Experimental Analysis of Formability of Explosive Welded Mg/Al Bimetallic Bars

Autorzy:

Mróz, S.
Szota, P.
Bajor, T.
Stefanik, A.

Powiązania:

https://bibliotekanauki.pl/articles/353760.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Mg-Al bimetallic bars
plastic deformation
physical modelling
numerical modelling
FEM

Opis:

The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of Mg/Al bimetallic specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Bimetallic bars of an outer diameter of 22.5 mm and a cladding layer thickness of 1.7 mm were obtained by the explosive welding method. Samples for formability tests, characterized by a diameter-to-length ratio of 1, were taken from the bars. The theoretical studies and experimental tests were carried out for the temperature range from 300 to 400°C and for different strain rates. Based on the obtained investigation results it has been found that the main parameters influencing the formability of Mg/Al bimetallic bars are strain rate than the process temperature.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2A; 501-507
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Analiza numeryczna wpływu materiału palnego na pole temperatury podczas pożaru
Numerical analysis of the influence of combustible material on the temperature field during fire

Autorzy:

Sosnowski, M.
Grabowska, K.

Powiązania:

https://bibliotekanauki.pl/articles/103787.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane

Tematy:

spalanie
pożar
CFD
modelowanie numeryczne
combustion
fire
numerical modelling

Opis:

Celem pracy było dokonanie analizy numerycznej wpływu zastosowanego materiału palnego na pole temperatury podczas pożaru. Analizom poddano trzy materiały wykorzystywane do produkcji materacy. Symulacje przeprowadzone zostały w programie PyroSim, który wykorzystuje do obliczeń kod FDS (Fire Dynamics Simulator). Uzyskane w ramach pracy wyniki, pozwoliły na zdefiniowanie cechy materiału, która posiada największy wpływ na rozkład temperatury. Ponadto określono w pracy rekomendacje w zakresie doboru materiałów wykończenia wnętrz.
The aim of the research was to analyze the influence of combustible material on the temperature field during building fire. Three materials used in matress production were analyzed. The e numerical analysis were performed in PyroSim soft ware, which uses FDS (Fire Dynamics Simulator) code to accomplish calculations. The obtained results allowed to define the property of material, which strongly influences the temperature field. Moreover recommendations in selection of interior finishing materials were defined.

Źródło:

Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2015, T. 3; 237-244
2300-5343

Pojawia się w:

Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa

Dostawca treści:

Biblioteka Nauki

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Tytuł:

Numerical simulation of thermal processes proceeding in a multi-layered film subjected to ultrafast laser heating
Symulacja numeryczna procesów cieplnych zachodzących w wielowarstwowych mikroobszarach poddanych działaniu ultrakrótkiego impulsu laserowego

Autorzy:

Majchrzak, E.
Mochnacki, B.
Suchy, J. S.

Powiązania:

https://bibliotekanauki.pl/articles/281751.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

microscale heat transfer
thin films
laser pulse
numerical modelling

Opis:

In the paper, the mathematical model, numerical algorithm and examples of computations concerning thermal processes proceeding in a multi-layered thin film subjected to an ultrafast laser pulse are discussed. The equations describing a course of the analysed process correspond to the dual-phase-lag model and contain both the relaxation time tau q and additionally the thermalization time tau T. At the stage of numerical simulation, the finite difference method has been used. The algorithm is based on an artificial decomposition of the domain considered, while common thermal interactions between successive layers are taken into account using conditions of heat flux and temperature continuity at points corresponding to internal boundaries (1D task has been considered).
W pracy przedstawiono model matematyczny, algorytm numeryczny i przykłady symulacji dotyczących przebiegu procesów cieplnych w wielowarstwowym mikroobszarze nagrzewanym ultraszybkim impulsem generowanym przez laser. Równanie opisujące przebieg procesu odpowiada modelowi z dwoma opóźnieniami wynikającymi z czasu relaksacji i czasu termalizacji. Na etapie obliczeń numerycznych wykorzystano metodę różnic skończonych. Algorytm bazuje na sztucznej dekompozycji obszaru wielowarstwowego, przy czym wzajemne oddziaływania między warstwami uwzględniono poprzez założenie ciągłości strumienia ciepła i pola temperatury na powierzchniach kontaktu. Biorąc pod uwagę geometrię obszaru, rozpatrywano zadanie jednowymiarowe.

Źródło:

Journal of Theoretical and Applied Mechanics; 2009, 47, 2; 383-396
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

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