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Wyświetlanie 1-15 z 275
Tytuł:
Dual-control missile guidance: a simulation study
Autorzy:
Bużantowicz, W.
Pietrasieński, J.
Powiązania:
https://bibliotekanauki.pl/articles/281826.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
dual-control missile
autopilot
guidance
miss distance
Opis:
Theoretical considerations and a simulation study concerning description and analysis of new autopilot structures and issues relating to conversion of guidance commands into deflections of a complex system of control surfaces aimed at minimizing the miss distance value are presented in this paper. Due to nonlinear and nonstationary nature of the phenomena associated with the guidance process, a significant role is assigned to simulation studies. A comparative analysis has been made of the guidance processes of three models of a dual-control missile, which differ in terms of formulae implemented in the control command converters.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 727-739
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study of a missile cold launch system
Autorzy:
Głębocki, R.
Jacewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/280307.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
guided missile
modeling
simulation
Opis:
In this paper the missile flight dynamics during the launch phase is studied. The main concept behind this work was to use a vertical cold launch system and the rapid pitch maneuver to achieve longer missile range and better firing coverage. A set of a small pulse rocket engines was used to obtain the desired missile attitude. The physical and mathematical models of the missile are described. The pulse jets control algorithm is presented. The computer program of the missile model has been developed in the Simulink environment. The missile behavior in the low-speed flight envelope has been examined. The results of numerical simulations in the form of the graphs are presented. It has been obtained that there exist several benefits of the cold launch method as increased range and higher target kill probability.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 901-913
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Study of Inventory Management in Supply Chains
Autorzy:
Wiśniewski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/503658.pdf
Data publikacji:
2018
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
supply chain
inventory management
computer simulation
Opis:
Well-organized management of a supply chain involves the control of inventory levels and fast response to the changing customer demands. Enterprises cannot cope with this problem which contributes to the growing stock levels and therefore increases costs. The main goal of the article is to present a simulation approach to the problem of inventory management in a supply chain. The work shows the use of computer simulation techniques in order to emulate a supply chain system and its stochastic behaviour. The procedure for the usage of simulation modelling was described in a case study containing an analysis of an online store. The simulation results are presented using statistical parameters, which means that managers can get not only information concerning the expected value of the parameter looking decision-making, but also statistics to the characteristics of the risk associated with the decision associated with possible uncertainty.
Źródło:
Logistics and Transport; 2018, 37, 1; 41-48
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated production system on social manufacturing: a simulation study
Autorzy:
Sari, Marti Widya
Herianto
Dharma-IGB, Budi
Tontowi, Alva Edy
Powiązania:
https://bibliotekanauki.pl/articles/27315509.pdf
Data publikacji:
2022
Wydawca:
STE GROUP
Tematy:
social manufacturing
integrated production systems
simulation study
ProModel
Opis:
Today, the manufacturing industry must adapt to dynamic customer needs, changing from time to time following market trends. So that the production process in manufacturing requires adjustments, one of which is by forming social manufacturing. This study aims to create an integrated production system model based on social manufacturing, which involves several Socialized Manufacturing Resources (SMR) as manufacturing resources that are socialized to produce a product. The methods used are field observation, literature study, design of a social manufacturing-based production system model, model simulation using ProModel software, and analysis of model simulation results. In this study, the simulation involves four SMRs, each of which makes a part that has been given specifications by the manufacturer based on customer requests. The product produced is the Sanitation Chamber, which is equipped with a control system to monitor reading data via the internet. The model simulation uses the Pro Model software and analyzes resource use, location utilization, and resource costs.
Źródło:
Management Systems in Production Engineering; 2022, 3 (30); 230--237
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study of hydrodynamic cavitation in the orifice flow
Autorzy:
Pietrykowski, Konrad
Karpiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/38436947.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
cavitation
CFD
fluid flow
hydrodynamics
orifice
simulation
Opis:
Hydrodynamic cavitation is a phenomenon that can be used in the water treatment process. For this purpose, venturis or orifices varying in geometry are used. Studying this phenomenon under experimental conditions is challenging due to its high dynamics and difficulties in measuring and observing the phase transition of the liquid. For this reason, the CFD method was used to study the phenomenon of hydrodynamic cavitation occurring in water flow through the orifice and then analyze flow parameters for different boundary conditions. The research was performed for four different orifice geometries and two defined fluid pressure values at the inlet, based on a computational 2D model of the research object created in Ansys Fluent software. As a result of the numerical simulation, the distribution of fluid velocity and pressure and volume fraction of the gas phase were obtained. A qualitative and quantitative analysis of the phenomenon of hydrodynamic cavitation under the considered flow conditions was conducted for the defined orifice geometries. The largest cavitation zone and thus the largest volume fraction of the gas phase was obtained for the orifice diameter of 2 mm with a sharp increase in diameter. However, the geometry with a linear change in diameter provided the largest volume fraction of the gas phase per power unit.
Źródło:
Applied Computer Science; 2022, 18, 3; 31-41
1895-3735
2353-6977
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A nanoscale simulation study of elastic properties of gaspeite
Autorzy:
Benazzouz, B.-K.
Powiązania:
https://bibliotekanauki.pl/articles/178463.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
carbonate rock
gaspeite
molecular dynamic
elastic properties
pressure effect
skała węglanowa
gaspeit
dynamika molekularna
właściwości sprężyste
wpływ ciśnienia
Opis:
The study of structural and mechanical properties of carbonate rock is an interesting subject in engineering and its different applications. In this paper, the crystal structure of gaspeite (NiCO3) is investigated by carrying out molecular dynamics simulations based on energy minimization technique using an interatomic interaction potential. At first, we focus on the structural properties of gaspeite mineral. And then, the elastic properties are calculated, including the elastic constants, bulk modulus, shear modulus, the S- and P-wave velocities. In the next part of this paper, the pressure effect will be studied on the structural and elastic properties of NiCO3 at high pressure.
Źródło:
Studia Geotechnica et Mechanica; 2014, 36, 2; 9-16
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Mielno Port design – results by real time simulation study
Autorzy:
Gucma, L.
Powiązania:
https://bibliotekanauki.pl/articles/360503.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship manoeuvring simulation
safety of navigation
port design
breakwater optimization
Opis:
Construction of new ports requires applying the entire range of methods and the close cooperation between designers and specialists of different field including safety of navigation or oceanography. At present there is no possible to conduct of such investments without carrying out simulation examinations. These studies most often take place as multistage where the next stage is the result of the previous one. The paper presents complex method of water areas optimization with consideration of navigational safety. In the present study was implemented real-time simulation method. Methods of the simulation of the real time leaning against manoeuvre simulators have been applied. Two distinct from each other alternatives have been explored and the best in terms of safety of navigation has been selected as final. The results were used as a guideline for the development project of a small Polish seaport in Mielno.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 38 (110); 32-38
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assesment of cortical bone thickness using cepstrum analysis. Simulation study
Autorzy:
Falińska, K.
Litniewski, J.
Tasinkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/332677.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Assessment of cortical bone thickness is important from a medical point of view because bone-layer thickness has a diagnostic value. The thinning of the cortical bone layer reduces the mechanical strength of the bone and exposes it to an increased risk of osteoporotic fractures [1]. The hip bone (proximal femur) is the most critical fracture site. The thickness of the cortical layer in the proximal femur is often too thin to be detected from ultrasonic echoes using traditional peak detection methods (for example the envelope method). In such a case the cepstrum analysis technique may be very useful. In this study the cepstrum method was applied to analyze numerically simulated echoes reflected from the layer and to determine layer thickness. In simulation, the transducer operated at 1 MHz and pulses of a 1.5 µs duration were assumed. The thickness of the thinnest layer for which the applied cepstrum analysis gave, the correct result equaled 1 mm, which was ¼ ƛ(ƛ– wavelength of an ultrasonic wave). That value of the d/ƛ ratio is sufficient for future measurements performed in-vivo conditions.
Źródło:
Hydroacoustics; 2014, 17; 47-56
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Satisfaction of the condition of order preservation : a simulation study
Autorzy:
Mazurek, Jiří
Kułakowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/406465.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pairwise comparisons
eigenvalue method
geometric mean method
condition of order preservation
numerical simulation
Opis:
We examine the satisfaction of the condition of order preservation (COP) concerning different levels of inconsistency for randomly generated multiplicative pairwise comparison matrices (MPCMs) of the order from 3 to 9, where a priority vector is derived both by the eigenvalue (eigenvector) method (EV) and the geometric mean (GM) method. Our results suggest that the GM method and the EV method preserve the COP almost identically, both for the less inconsistent matrices (with Saaty’s consistency index below 0.10), and the more inconsistent matrices (Saaty’s consistency index equal to or greater than 0.10). Further, we find that the frequency of the COP violations grows (almost linearly) with the increasing inconsistency of MPCMs measured by Koczkodaj’s inconsistency index and Saaty’s consistency index, respectively, and we provide graphs to illustrate these relationships.
Źródło:
Operations Research and Decisions; 2020, 30, 2; 77-89
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Beneficiation of oxide ores using dense medium cyclones. A simulation study
Autorzy:
Aghlmandi Harzanagh, A.
Ergun, S. L.
Gulcan, E.
Powiązania:
https://bibliotekanauki.pl/articles/110337.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy medium cyclone
heavy liquid
simulation
iron ores
manganese
chromite
Opis:
Recent investigations of particle behavior and segregation phenomena in a cyclone underline that little is known about particle distribution within a heavy medium separation. For this purpose, density profiles in a heavy medium cyclone (HMC) is measured with techniques such as computational fluid dynamics (CFD) in combination with discrete element modelling (DEM), electrical resistance tomography (ERT), X-ray tomography, particle dynamics analyzer (PDA) etc. Along with these modern efforts of determining the performance of HMC, traditional methods depending on empirical inferences based on experimental data are still important and in progress. The aim of this research was to investigate the possibility of using HMC for the concentration of problematic ores which are not coarsely aggregated. Towards this purpose, current empirical methods were applied to experimental data which were derived from float-sink tests of selected heavy minerals and Fe, Mn, and Cr ore samples. Low density difference between particles made the enrichment difficult using other gravity methods like jigs and shaking tables. After determining physical and mineralogical properties of the samples, appropriate size fractions were prepared for float-sink tests. Combination of sodium polytungstate and tungsten carbide powder were used to prepare non-toxic heavy liquids with density up to 3.5 g/cm3. Using the sink-float test results and existing empirical models for high-density DMC plants simulations were performed. The results of the simulations followed by experimental studies showed that HMCs are applicable to process Fe, Mn, and Cr ores with acceptable grade and recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 379-393
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prompt gamma-ray methods for industrial process evaluation : a simulation study
Autorzy:
Mohammed, Mohammed Siddig H.
Alhawsawi, Abdulsalam M.
Aljohani, M. S.
Damoom, Mohammed M.
Banoqitah, Essam M.
Elmoujarkach, Ezzat
Powiązania:
https://bibliotekanauki.pl/articles/2105331.pdf
Data publikacji:
2022
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
prompt gamma ray
sealed sources
radiotracers
industrial process
Opis:
Radioisotope applications in industrial process inspection and evaluation using gamma-ray emitters provide otherwise unavailable information. Offering alternative gamma-ray sources can support the technology by complementing sources’ availability and radiation safety. This work proposes to replace gamma-ray from radioisotopes with prompt gamma-ray from the interaction of neutrons with stable isotopes injected into the industrial process or with the structural material of the industrial process equipment. Monte Carlo N-Particle Transport Code (MCNP5) was used to simulate the irradiation of two-phase fl ow pipes by 252Cf neutron source. Two simulations were run for each pipe, with and without mixing the liquid phase with the stable isotope 157Gd. The detected gamma-ray spectra were analysed, and images of the two phases inside the pipes were produced. The images were compared to images obtained from simulations of gamma transmission measurement using 60Co. Furthermore, results for prompt gamma computed tomography (CT) were presented and discussed. The studies’ outcomes indicate the potential of prompt gamma-ray to carry out the sealed sources applications of gamma transmission measurements and imaging.
Źródło:
Nukleonika; 2022, 67, 1; 11--18
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical simulation study of mold filling in the injection molding process
Autorzy:
Baum, Markus
Anders, Denis
Powiązania:
https://bibliotekanauki.pl/articles/29520096.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
injection molding
polymers
Hele-Shaw approximation
computational fluid dynamics
computing methods
Opis:
Injection molding can undoubtedly be regarded as one of the most widely used manufacturing processes for polymers (Guevara-Morales & Figueroa-Lopez, 2014). Furthermore, injection molding has found its way into various branches of industry (Fernandez et al., 2018) since it has several essential advantages over other processing techniques in terms of good surface finish, the ability to process complex parts without the need for secondary operations, and low cost for mass production. In order to find optimal process settings, it is necessary to gain a deeper insight into the filling process and the underlying physical phenomena, as well as a thorough understanding of the complex material behavior. In this context, the numerical simulation of the injection molding process is increasingly important. Therefore, the current contribution is dedicated to present a thorough comparative numerical study for the mold filling of an exemplary thin-walled mold geometry, including a realistic non-Newtonian viscosity model for the polymer melt. For the numerical simulation, the authors employ the commercial CFD software packages Cadmould 3D-F and ANSYS CFX. While ANSYS CFX is a well-established CFD software for numerical modelling of multiphysical phenomena, Cadmould 3D-F is a highly specialized and computationally efficient alternative suitable for certain geometric configurations in the context of injection molding. The present study is new in the sense that it demonstrates the equivalence of the considered software packages for the simulation of the injection molding process in thin-walled mold geometries.
Źródło:
Computer Methods in Materials Science; 2021, 21, 1; 25-34
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistics of Envelope of High-Frequency Ultrasonic Backscatter from Trabecular Bone: Simulation Study
Autorzy:
Litniewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/177928.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
trabecular bone
Rayleigh distribution
scattering
simulation
Opis:
The paper considers the application of statistical properties of backscattered ultrasonic signal for assessment of the trabecular bone status. Computer simulations were conducted to investigate the properties of the ultrasound pulse-echo signal, as it is received on the transducer surface after scattering in trabecular bone. The micro-architecture of trabecular bone was modeled by a random distribution of long and thin cylindrical scatterers of randomly varying diameters and mechanical properties, oriented perpendicular to the ultrasound beam axis. The received echo signal was calculated as a superposition of echoes from all the scatterers present in the scattering volume. The simulated signal envelope was used for statistical processing to compute various parameters like the mean amplitude, the amplitude MSR defined as the ratio of the mean to the standard deviation and the amplitude histogram. Results indicated that while for the well-defined trabeculae properties within the simulated bone structure the signal envelope values are Rayleigh distributed the significant departures from Rayleigh statistics may be expected as the thickness of trabeculae become random. The influence of the variation of mechanical properties of the bone tissue building the trabeculae on the bone backscattered signal parameters was not observed.
Źródło:
Archives of Acoustics; 2010, 35, 3; 349-360
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD simulation study of air flow around the airfoil using the Magnus effect
Autorzy:
Sokołowski, P.
Czarnigowski, J.
Magryta, P.
Powiązania:
https://bibliotekanauki.pl/articles/117936.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
Magnus effect
simulation
air flow
Opis:
The article presents a simulation study of air flow around the airfoil equipped with an additional rotary element, using the Magnus effect to change the air flow around it. For this purpose, a two-dimensional computational model for the airfoil without and with the moving element was made. The model was based on the airfoil NACA 8-H-12. The article describes a method of creating a model in two versions: without moving computational grid and with moving computational grid. Studies were carried out for a typical flow rate corresponding to the flow velocity around the gyroplane in a nominal flight speed conditions. Article shows a comparison of flows in both cases, and assesses the impact of the geometry that use the Magnus effect on the work of airfoil.
Źródło:
Applied Computer Science; 2015, 11, 3; 19-33
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study of longitudinal forces in the coupling device of heavy freight trains
Autorzy:
Stokłosa, J.
Jaśkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/102629.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
heavy freight trains
longitudinal forces
coupling devices
Nadal criterion
modeling
simulation
theory of Kalker’s contact
Opis:
On the LHS line (Broad-gauge Metallurgical Line), far out West of the railway line with a gauge of 1520 mm, heavy goods trains for a gross weight 5500 tons and a length of 850 m are operated. The article presents the results of a simulation study of the forces that occur in the automatic coupling device of SA-3 type of Russian production train consisting of 60 coal wagons of Russian construction of gross mass 91 tons each. The train moves on the 1520 mm gauge tracks curve S type (the radius of curvature of curves 300 m). Simulation studies were conducted using the Train Module of program to dynamic study multielements systems of Universal Mechanism UM 6.0. Keywords: heavy freight trains, the longitudinal forces in the coupling device, Nadal criterion, modeling, simulation, the theory of Kalker’s contact.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 21; 24-30
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 275

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