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Wyszukujesz frazę "simulation and modelling" wg kryterium: Temat

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Wyświetlanie 1-15 z 45
Tytuł:
Simulations of hot-gas flow in internally cooled cascade of turbine vanes
Autorzy:
Sznajder, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/242679.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft engines
mechanical engineering
engine parts
simulation and modelling
Opis:
An experiment in cooling of gas turbine nozzle guide vanes was modelled numerically with a conjugate viscousflow and solid-material heat conduction solver. The nozzle vanes were arranged in a cascade and operated in highpressure, hot-temperature conditions, typical for first turbine stage in a flow of controlled-intensity, artificiallygenerated turbulence. The vane cooling was internal, accomplished by 10 channels in each vane with cooling-air flow. Numerical simulations of the experiment were conducted applying two turbulence models of the k-omega family: k-omega-SST and Transition SST implemented in the ANSYS Fluent solver. Boundary conditions for the simulations were set based on conditions of experiment: total pressures and total temperature on inlet to cascade, static pressure on the outlet of the cascade and heat flux on the surface of cooling channels. The values of heat flux on the surface of cooling channels were evaluated based on Nusselt numbers obtained from experiment and varied in time until steadystate conditions were obtained. Two test cases, one with subcritical outlet flow, and another one, with supercritical outlet flow were simulated. The result of experiment – distributions of pressure, surface temperature, and heat transfer coefficients on the vane external surface were compared to results of numerical simulations. Sensitivity of the vane surface temperatures and heat transfer coefficients to turbulence models and to boundary-condition values of parameters of turbulence models: turbulence energy and specific dissipation of turbulence energy was also studied.
Źródło:
Journal of KONES; 2019, 26, 2; 151-158
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of Dielectric Properties of BiNbO4-Based Microwave Ceramics
Autorzy:
Czekaj, D.
Lisińska-Czekaj, A.
Garbarz-Glos, B.
Bąk, W.
Powiązania:
https://bibliotekanauki.pl/articles/356034.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
BiNbO4 ceramics
impedance spectroscopy
simulation and modelling
quivalent electric circuit method
Opis:
In the present paper results of the studies devoted to computer simulations of dielectric response of electroceramics in a frequency domain as well as analysis of the experimental data are given. As an object of investigations BiNbO4-based microwave ceramics was taken. Simulations of the hypothetical impedance response of the ceramic system were performed under assumption of the brick-layer model. A strategy for analysis and modelling of the impedance data for microwave electroceramics was discussed. On the base of the discussed strategy modelling of the dielectric response of BiNbO4 ceramics was performed with the electric equivalent circuit method. The Voigt’s and Maxwell’s circuits were taken as electric models. Parameters of the electric components of the circuits were determined and related to parameters of the ceramic object under study. It was found that fitting quality was good and changed within the range χ2 = 6.78 × 10-4 – 6.77 × 10-5 depending on the model.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1177-1181
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation in factory optimisation
Autorzy:
Gregor, M.
Matuszek, J.
Powiązania:
https://bibliotekanauki.pl/articles/118279.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
FMS
DOE
modelling and simulation
optimisation
Opis:
Many manufacturing systems must operate under resource constraints. Simulation can help to improve the operation of such manufacturing systems. This paper presents a practical approach how to conduct a simulation project. A Flexible Manufacturing System (FMS) was chosen for the simulation. The targets for FMS improvement were given. A set of measures was proposed to meet the given targets. Design of Experiments (DoE) was used to minimise the number of simulation experiments. There were simulated and evaluated various measures and control strategies and their influence on the FMS characteristics. Rough cost analysis of each simulated variant was done. Future research targets are presented.
Źródło:
Applied Computer Science; 2005, 1, 1; 61-74
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and simulation food products production
Autorzy:
Matuszek, J.
Jasik, L
Powiązania:
https://bibliotekanauki.pl/articles/117761.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
modelling and simulation
production process
BCM
Opis:
Modelling and simulation food product production are presented in the paper. There is some information about how to analyse continuous production systems in food industry. As the example we have got here in the paper choosen food product production simulation. There was illustrated optimum production process run. In modelling and simulation there was included food industry specifity. There was take into consideration how components expiration date and production times influence on ready made products expiration date. The problem was solved in support of ARENA module. There is some information about solving problems of machine servicing with taking into account technological changes.
Źródło:
Applied Computer Science; 2008, 4, 1; 51-60
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of production processes by searching and increasing of the production system constraints with utilization of the modelling and simulation method
Autorzy:
Plinta, D.
Powiązania:
https://bibliotekanauki.pl/articles/117973.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
modelling and simulation
theory of constraints
Opis:
There is presented the practical application example of the theory of constraints, in the paper. In all enterprises from engineering industry, the main problem connected with realization of production orders are the constraint existing in every production system. Searching and increasing of the bottleneck (constraint) should be the first step in situation, when exist necessity to increase production. There are described principles and stages of the production system improvement, which are based on the mentioned above theory. In the paper, there is demonstrated that the computer simulation is very useful aiding tool for finding constraints and facilitating the analysis of different proposed changes in production systems.
Źródło:
Applied Computer Science; 2005, 1, 1; 75-92
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric analysis of automotive mechatronic systems
Autorzy:
Puchalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/246388.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
automotive mechatronics
parametric analysis
modelling and simulation
Opis:
The paper presents the analysis results of the fan system using hardware/software multi-technology language VHDL-AMS (IEEE 1076.1) and System Vision design platform. The analysis was performed in the time domain for the selected sweep values of the component parameters. The sensitivity analysis was used to vary selected, user-specified percentage of rated values . The parameters were arranged according to the effect on the selected waveforms. The further analysis was performed using statistic method Monte Carlo (MC) and Worst Case (WCA). Results of simulation are presented and the advantage of MC simulation over sensitivity analysis was emphasized. Post processing measurement tools of MC results and calculator with the standard mathematical operators and advanced statistic functions were used to picture the system performance versus run number and to determine correlations between devices parameters and system performance. The obtained characteristics enable the designer to evaluate the reliability of the system when manufactured in the large scale and to state the worst case limits for the project.
Źródło:
Journal of KONES; 2010, 17, 2; 403-407
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vehicular traffic simulations: use of a games engine for video rendering and verification of an architecture model based on queuing systems
Autorzy:
Pasini, L.
Rietti, F. M.
Allegretto, F.
Powiązania:
https://bibliotekanauki.pl/articles/1938605.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
traffic systems
queuing networks
modelling and simulation
graphic simulation
Opis:
In a previous work [Pasini L and Sabatini S 2016 TASK Quart. 20 (1) 9], we described a technique that allows a specific system of urban traffic to be associated to a description file system, called Model.dat. This file contains a list of data objects that are defined in the library [Pasini L and Feliziani S 2013 TASK Quart. 17 (3) 155] and that form the architecture model of a vehicular traffic system. This model turns out to be a network of queuing systems. In this work, we illustrate how we adapted the old procedure to study a new urban traffic system. Moreover, through a new tracking procedure, we illustrate how we developed a graphic simulation able to reinterpret the data from the simulation of the queuing networks model, in order to make it easier to check the effectiveness of the simulator and to have a graphical way to analyze the data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 3; 273-294
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of Activated Sludge Model with Scarce Data Sets
Autorzy:
Andraka, D.
Piszczatowska, I. K.
Dawidowicz, J.
Kruszyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/124360.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
activated sludge models
modelling and simulation
model calibration
Opis:
Mathematical models of activated sludge process are well recognised and widely implemented by researchers since 1980's. There is also numerous software available for modelling and simulation of activated sludge plants, but practical application of those tools is rather limited. One of the main reasons for such a situation is a difficult process of model calibration the requires extended data sets collected at investigated plant. Those data are usually not included in a standard plant monitoring plan. In the paper the problem of model calibration with the data sets derived from standard monitoring plan is discussed with a special regard to simulation objectives and data availability. The research was conducted with operational data from Białystok Wastewater Treatment Plant. The model of the plant was based on Activated Sludge Model No.3 developed by IWA Task Group and implemented in ASIM simulator. Calibration and validation of the model gave promising results, but further applications should be carefully considered, mainly due to uncertainties underlying input data.
Źródło:
Journal of Ecological Engineering; 2018, 19, 6; 182-190
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy logic in rationalization of production systems on the basis of simulation project
Autorzy:
Kukla, S.
Powiązania:
https://bibliotekanauki.pl/articles/117655.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
modelling and simulation
multicriterion evaluation of variants
fuzzy logic
Opis:
The present paper presents a systemic approach to foundry management. Thanks to production process modelling and simulation techniques, an attempt was made to synthesise many interconnected devices and numerous manufacturing stages into one production system. The sheets of multi-criterion evaluation were prepared, where criteria and variants were assessed by means of subjective point evaluation and fuzzy character evaluation. The paper presents an analysis example of finishing activities of castings realized in foundry and in cooperation.
Źródło:
Applied Computer Science; 2010, 6, 1; 91-98
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Surgical Training Practice with the Spring Tensor Heuristic Model
Autorzy:
Chiu, C.
Chaczko, Z.
Powiązania:
https://bibliotekanauki.pl/articles/226752.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laparoscopic surgical training
spring tensor model
modelling and simulation systems
Opis:
The enhancement of surgical simulation tools is an important research study, to assist in the assessment and feedback of medical training practice. In this research, the Spring Tensor Model (STEM) has been used for laparoscopic end-effector navigation through obstacles and high-risk areas. The modelling of the surgical trainer as part of the laparoscopic simulator seeks to emulate the physical environment as a virtualized representation in the integrated infrastructure. Combining sensor network framework paradigms to a surgical knowledge-based construct demonstrates how STEM can enhance medical practice. The architectural hybridisation of the training framework has enabled the adaptation of STEM modelling techniques for a simulated laparoscopic training methodology. The primary benefit of the architecture is that this integration strategy has resulted in a seamless transition of the heuristic framework to be applied to surgical training.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 237-244
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling & Simulation as a Strategic Tool for Decision-Making Processes: A Dairy Case Study
Autorzy:
Eccher, Cristiani
Geraghty, John
Powiązania:
https://bibliotekanauki.pl/articles/1818472.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
modelling and simulation
dairy industry
decision-making processes
optimising
GAMS
Opis:
The dairy industry faces many challenges when compared to other sectors. On the supply side, due to the nature of the raw material, large inventories are not applied; during the manufacturing process, continuous production is highly sensitive to any sort of unplanned disruption; on the demand side, the market dictates the bulk powder commodity prices. In response to the growth in competition, dairy organizations’ strategy must incorporate technology into their daily processes in order to become more efficient, profitable and sustainable. To achieve desired levels of improvement, Modelling and Simulation (M&S) has been increasing in popularity in the decision-making process. Using a dairy company as a case study, this paper has highlighted the potential for M&S to be used as a powerful strategic tool for decision-making processes.
Źródło:
Decision Making in Manufacturing and Services; 2020, 14, 1; 5--22
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inversion of Remote Sensing Data Using Multiple Ratios of Spectral Radiation Intensities and Neural Networks
Autorzy:
Cięszczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032310.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
remote sensing
infrared spectrometers
infrared spectra
computer modelling and simulation
Opis:
The article presents a method for determining the content and temperature on the basis of spectra from remote measurements. The technique uses measurements of a high resolution radiation spectrum that allows the visibility of the individual rotational lines of gases such as CO₂, used here in the range of 2470-2495 cm¯¹. At the same time a new algorithm is applied of pre-processing the spectrum, involving the use of multiple ratios of intensity at several wavenumbers as input to an inverse model based on neural networks. Due to it, the dimensionality of the input can significantly be reduced. Additionally, the data interpreted do not have to be measured in units of spectral radiance. Thus only the calibration of the sensitivity of the spectrometer at various wavelengths is required. The neural models were constructed on the basis of data from the simulation. The proposed method works with a uniform layer of radiating gas for determining the temperature and CO₂ content. For a non-uniform layer it is possible to determine the line-of-sight temperature profile and average gas content. The method can be extended to different spectral ranges and to other gases present in substantial quantities in the exhaust gases of various processes.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1454-1459
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Curie temperatures for the Ising model on Archimedean lattices
Autorzy:
Malarz, K.
Zborek, M.
Wróbel, B.
Powiązania:
https://bibliotekanauki.pl/articles/1964143.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska
Tematy:
computer modelling and simulation
Ising model
phase transition
critical parameter
Opis:
Critical temperatures for the ferro-paramagnetic transition in the Ising model are evaluated for five Archimedean lattices, basing on Monte Carlo simulations. The obtained Curie temperatures are 1.25, 1.40, 1.45, 2.15 and 2.80 [J/kB] for (3,12 do2), (4,6,12), (4,8 do 2), (3,4,6,4) and (3 do 4,6) lattices, respectively.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 4; 475-480
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and numerical simulation of symmetric vibrations of the KNI 140070 viaduct -ballasted track - KTX train system
Autorzy:
Szurgott, P.
Klasztorny, M.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/247456.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
railway bridge
composite bridge
ballasted track
KTX train
modelling and simulation
Opis:
The paper develops a new methodology of FE modelling and simulation of the bridge - track - moving train system with the use of CAE systems. The KNI 140070 viaduct of span length 14.40 m, located on the Polish Central Main Line, has been selected. The modernized track contains: 60E1 main rails equipped with Vossloh 300-1 fasteners, 60E1 side rails with SB3 fasteners, B 320 U60 sleepers, crushed stone ballast, approach RC slabs. A KTX (Korea Train eXpress) high-speed train, being a modification of a TGV train, is taken into consideration. A methodology of physical and numerical modelling of the viaduct, the track and the train was developed using Altair HyperMesh and LS-PrePost software. The FE model of a bridge superstructure consists of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL TRACK and RAIL TRAIN modules available in LS-Dyna system were applied for simulating the train — trach interaction. Hughes-Liu beam elements were used for the rail modelling. Rail fastenings were simulated using one-dimensional discrete spring and damper elements. Carbodies, bogieframes and wheelsets were considered as rigid bodies and they were modelled using shell and beam elements. Cylindrical and revolute constrained joints and discrete springs and dampers were applied to connect all components of the FE model of rail-vehicles. The exemplary simulation of transient vibrations of the bridge - trach -train system has been made for service velocity 300 km/h. Contours of displacement and stress and selected time histories for displacements, accelerations and stresses, created in LS-PrePost and HyperView software, have been analysed.
Źródło:
Journal of KONES; 2010, 17, 3; 415-422
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Span length influence on dynamic response of selected bridge under high - speed train
Autorzy:
Szurgott, P.
Bernacki, P.
Powiązania:
https://bibliotekanauki.pl/articles/247827.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
railway bridge
composite bridge
ballasted track
high-speed train
modelling and simulation
Opis:
The paper presents a methodology of finite element (FE) modelling and simulation of the bridge – track – moving high-speed train system using CAE systems. Two composite (reinforce-concrete – steel) bridges were considered. The span length was equal to 15 and 21 meters, respectively. Bridges selected for the study belong to the proposed series of bridges with the span length of 15 to 27 meters stepped by 3 meters. Full symmetry of the bridges was assumed. RC platform was homogenized since the rebars were distributed quasi-uniformly in the specified platform sections. The FE model of a bridge superstructure consisted of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL_TRACK and RAIL_TRAIN LS-DYNA’s modules were applied for simulating the moving train – track interaction. Ballasted track with the rectilinear rail-line axis was taken into consideration. German ICE-3 train running at velocity of 200–300 km/h was selected as a representative for the study. All mass components of the train FE model were treated as rigid bodies. Symmetric vibrations of the train units were assumed with respect to the main longitudinal vertical plane of symmetry of the system. Nodal displacement and longitudinal normal stress in shell elements were registered during the FE analysis. The results were depicted in the form of time histories for selected velocities. In addition, extreme values of vertical deflections and normal stress were compiled and presented a function of train velocity. It allowed to assess the dynamic response of the bridge depending on its span length. Contours of resultant displacement for the RC platform was also presented.
Źródło:
Journal of KONES; 2013, 20, 1; 343-350
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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