Temat: dynamic simulation - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Practical Approach to Determining Dynamic Recrystallization Parameters Using Finite Element Optimization of Backward Extrusion Process
Autorzy:: Irani, Missam
Joun, Mansoo
Tematy:: dynamic recrystallization
grain size
optimization
simulation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352583.pdf Link otwiera się w nowym oknie
Opis:: In this study, we present a new method for obtaining the parameters of the Johnson-Mehl-Avrami-Kolmogorov equation for dynamic recrystallization grain size. The method consists of finite-element analysis and optimization techniques. An optimization tool iteratively minimizes the error between experimental values and corresponding finite-element solutions. Isothermal backward extrusion of the AA6060 aluminum alloy was used to acquire the main parameters of the equation for predicting DRX grain size. We compared grain sizes predicted using optimized and reference parameters with experimental values from the literature and found better agreement when the optimized parameters were applied.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of break shoes wearing in drum break - numerical approach
Autorzy:: Damaziak, K.
Jachimowicz, J.
Małachowski, J.
Tematy:: road transport
simulation
brakes
thermal dynamic computations; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246894.pdf Link otwiera się w nowym oknie
Opis:: Braking system is one of the key components influencing passenger safety. Today, a design process of brakes is usually experience - driven, based on brake manufactures know - how. Using this approach, it is fairly difficult predict the brake components exact working condition or durability - parameters still more often required in a modern design process, what results in a rising demand for an exact simulation of a braking process. This paper presents numerical analyses of a drum brake. Both static and dynamic FE analyses were conducted in order to verify behaviour of numerical procedures affecting the braking process. The phenomena of heat generation by friction forces and the influence of a wear pattern was emphasized during dynamic calculations, while static analyses were focused on sensitivity to thermal properties of materials. FE models, including loads and boundary conditions, are described in details. Some of the data used during the simulation were taken from experiments. These laboratory tests are also briefly described in the paper. Based on the obtained results, it is shown that a numerical procedure converting sliding energy coming from friction to heat used in a coupled mechanical - thermal dynamic calculation works properly, but is very sensitive to material thermal properties. Proper FE modelling of the contact area and contact forces is also crucial. Unfortunately, due to lack of real material data, the presented results have quantitive character only.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Stability control of propeller Autonomous Underwater Vehicle based on combined sections method
Autorzy:: Qi, D.
Feng, J.
Liu, A.
Hu, J.
Xu, H.
Li, Y.
Ashraf, M. A.
Tematy:: propeller AUV
dynamic model
stability control
simulation; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259119.pdf Link otwiera się w nowym oknie
Opis:: Learning from the motion principle of quadrotor, a symmetric propeller AUV, which has small size and low velocity is designed. Compared with the AUV equipped with rudders, it has better maneuverability and manipulation at low velocity. According to the Newton-Euler method, the 6 DOF kinematic model and dynamic model of the propeller AUV are established. A stability controller that consists of 3 different PID controllers is designed. It makes the depth and attitude angle as trigger conditions, and the relevant controller is chosen in different moving process. The simulation experiments simulate ideal motion state and disturbed motion state, and experiments results show that the stability controller based on combined sections method can make the best of mature technology of PID, and meet the control requirements in different stages. It has a higher respond speed and accuracy, improving the stability of the propeller AUV under the disturbance of complex ocean currents.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical simulation of heat flow processes
Autorzy:: Mielewczyk, A.
Tematy:: simulation
dynamic model
heat transfer
Z-transform; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259531.pdf Link otwiera się w nowym oknie
Opis:: Numerical simulation methodis basedon mathematical models of physical processes, which describe run of a given process with a various accuracy. This paper presents a method for elaborating the computer simulation models based on differential equations. This makes it possible to obtain a high accuracy of representing dynamic features of a real process. The derived results are given in the form of numerical series. An example of modelling the dynamics of heat transfer through aflat wall is presented in the second part of the paper. Basing on the model one can simulate the process of operation of ship engine as well as such auxiliary devices as a cooler, evaporator, condenser, tank heating system etc.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A discrete model of the plate heat exchanger
Autorzy:: Mielewczyk, A.
Tematy:: simulation
dynamic model
Z-transform
plate cooler
ship facilities; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258934.pdf Link otwiera się w nowym oknie
Opis:: Developing numerical control methods requires precise models of technical machines. The article presents a discrete model of a plate heat exchanger. The model was worked out based on differential equations to secure high accuracy. Correctness of the model was verified using the data for the M10 – MFM cooler produced by Alfa-Laval.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Dynamic-accumulative operation policy of continuous distillation for the purification of anisole
Autorzy:: Wang, Z.
Li, S.
Wang, C.
Guo, X.
Bai, P.
Tematy:: anisole recycling
dynamic-accumulative operation policy
continuous distillation
simulation; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/779622.pdf Link otwiera się w nowym oknie
Opis:: In the B10 isotope enrichment industry, the purification of anisole mixture makes great sense. A dynamic-accumulative operation policy of continuous distillation (DACD) with repeated filling and dumping of the still is proposed for the separation of trace heavy impurities in the recycled anisole. To simulate and optimize the purification process of anisole, a mathematical model of DACD is derived, and the computer codes are developed in the MATLAB environment. Moreover, the experiment is performed in a pilot-scale distillation column. The results show that the experimental date agrees well with simulation results. DACD could solve the difficulty of flow rate control when the bottom flow rate is very small in continuous distillation. The size of the still in this operation mode is also smaller than that in batch distillation. And the yield of anisole is raised to 99.91%. In a word, DACD is especially suitable for separating trace heavy impurities from the recycled anisole.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Unmanned ship simulation with real-time dynamic risk index
Autorzy:: Brake, M. C. ter
Iperen, E. (W. H.) van
Looije, D.
Koldenhof, Y.
Tematy:: autonomous ship
ship domain
simulation
dynamic risk
real-time
risk; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135142.pdf Link otwiera się w nowym oknie
Opis:: Currently there is growing interest in unmanned shipping. In the case of unmanned ‘autonomous’ shipping, navigation is automated by on-board decision-making systems. Important motives for unmanned ships include the shortage of skilled mariners, the facilitation of slow steaming strategies, efficiency improvements in confined shipping areas, and increased safety. The aim of the present research is to simulate an unmanned ship through an Automatic Identification System (AIS) based traffic situation. In order to do this, the Maritime Research Institute Netherlands (MARIN) will use the existing simulation technology Dolphin, implement a new tool to read AIS data, simulate a large amount of ships, and develop an auto-captain. The real-time dynamic risk index developed by MARIN will be integrated in Dolphin, to monitor nautical safety of all ships with focus on the unmanned ship. The simulated unmanned ship will navigate according to the International Regulations for Preventing Collisions at Sea (COLREGS). In more complex situations, the auto-captain may use a dedicated decision support tool to find a more efficient solution to pass safely. This approach will be analysed using the real-time dynamic risk index, which will be updated based on latest insights. This paper will discuss the latest development and plans in the unmanned ship simulation project.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Modelowanie układów dynamicznych i technika obliczeń wielowątkowych
Dynamic systems modelling and multithreaded computations technology
Autorzy:: Stabrowski, M.
Tematy:: układy dynamiczne
symulacja
obliczenia wielowątkowe
dynamic systems
simulation
multithreaded computations; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/157785.pdf Link otwiera się w nowym oknie
Opis:: Artykuł prezentuje system symulacyjny AMIL służący do modelowania układów opisywanych za pomocą równań różniczkowych zwyczajnych i równań algebraicznych. System AMIL został zrealizowany w dwóch wersjach - z informacją wejściową mającą postać programu lub schematu blokowego. Pokazano przykłady użycia obu wersji systemu. najnowszy kierunek prac nad systemem AMIL koncentruje się na badaniu celowości i efektywności wprowadzenia wielowątkowych metod obliczeniowych.
Simulation system AMIL presented in this paper is targeted at modelling the systems described with the aid of ordinary differential equations and algebraic equations. AMIL system has been implemented in two complimentary variants. The first one accepts program text as input. Integrated development environment of this AMIL version is presented in fig. 1 and 2. Alternative AMIL version uses block diagram as dynamic system model. Examples of user interface for this version are ahown in fig. 3 and 4. Most recent research in the field of dynamic systems modelling is aimed at implementation and investigation of multithreaded computations. As a testbed scalable heat transfer equation has been selected (fig.5). The results of the tests carried on dual HT processor platform (tab.1) lead to the conclusion that this computational technology offers real speed-up for large problems only.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The use of computer simulations in the analysis of physical phenomena models
Autorzy:: Dziurdź, Jacek
Tematy:: dynamic models
simulation
signal analysis
modele dynamiczne
symulacja
analiza sygnałów; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/127720.pdf Link otwiera się w nowym oknie
Opis:: Tests of the technical condition of machines sometimes involve the analysis of dynamic phenomena associated with their work. The simplest methods are based on basic measurements, e.g. effective velocities and body vibration accelerations as well as sound pressure levels recorded in close vicinity of the tested object. For analysis, more advanced techniques use signals recorded in a certain period of time representing the studied phenomena. The development of computer techniques has enabled a relatively convenient modelling of technical objects. A well-identified model allows to extend research on real objects to include comprehensive computer analyses, thanks to which we can reduce time-consuming measurements or perform analyses for excitations which are difficult to perform at a test stand. Another application of a model is to generate signals, on the basis of which we can choose parameters of analysis methods to increase the effectiveness of diagnosis or test new analysis and inference algorithms. Several presented examples were implemented in the Matlab Simulink environment. Because the presented methods are universal, they can be used to analyze any physical phenomena described with more or less complicated models.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Transient Energy Models of Housing Facilities Operation
Autorzy:: Deshko, Valerii
Bilous, Inna
Biriukov, Dmytro
Yatsenko, Olena
Tematy:: dynamic modelling
simulation
temperature
heating system load
controller
Matlab
Simscape
Simulink
EnergyPlus; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/2069893.pdf Link otwiera się w nowym oknie
Opis:: Buildings are the main consumer of energy resources in the total energy balance of the countries in Central and Eastern Europe, the main energy consumption is allocated for heating. Efficient use of energy resources for heating needs to a large extent depends on the efficiency of regulation of heating systems. In the article, dynamic mathematical models of a two-room typical apartment in Ukraine, built in 2016, were developed in Matlab and EnergyPlus software environment. The simulations were carried out using IWEC hourly climate data for the city of Kyiv. The results of simulations of thermal energy consumption in Matlab are characterized by a larger range of fluctuations of the heating system load, which is typical for the real operating conditions of the system with the controller of ON/OFF type. In EnergyPlus it is assumed that the gas boiler operates continuously in the ON mode. In the research, the change of load on the apartment heating system was studied at different numbers and locations of air temperature control sensors installation, according to which the controller of the autonomous gas boiler operates.
Dostawca treści:: Biblioteka Nauki

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