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Wyświetlanie 1-9 z 9
Tytuł:
Real-time human in the loop MBS simulation in the Fraunhofer robot-based driving simulator
Symulacja w czasie rzeczywistym układu wieloczłonowego z człowiekiem w pętli w opartym na robocie symulatorze kierowania pojazdem opracowanym w Instytucie Fraunhofera
Autorzy:
Kleer, M
Gizatullin, A
Dreßler, K.
Müller, S.
Powiązania:
https://bibliotekanauki.pl/articles/139514.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
driving simulator
human in the loop
real-time MBS simulation
symulator jazdy
MBS
czas rzeczywisty
Opis:
The paper encompasses the overview of hardware architecture and the systems characteristics of the Fraunhofer driving simulator. First, the requirements of the real-time model and the real-time calculation hardware are defined and discussed in detail. Aspects like transport delay and the parallel computation of complex real-time models are presented. In addition, the interfacing of the models with the simulator system is shown. Two simulator driving tests, including a fully interactive rough terrain driving with a wheeled excavator and a test drive with a passenger car, are set to demonstrate system characteristics. Furthermore, the simulator characteristics of practical significance, such as simulator response time delay, simulator acceleration signal bandwidth obtained from artificial excitation and from the simulator driving test, will be presented and discussed.
Artykuł zawiera przeglĄd architektury sprzętowej i charakterystyk systemowych symulatora kierowania pojazdem opracowanego w Instytucie Fraunhofera. Na wstępie zdefiniowano i przedyskutowano szczegółowo wymagania dla modelu czasu rzeczywistego i obliczeń w czasie rzeczywistym. Zaprezentowano takie aspekty systemu, jak opóźnienie transportu i obliczenia równoległe złoŻonych modeli czasu rzeczywistego. Pokazano ponadto działanie interfejsu pomiędzy modelem i systemem symulatora. W celu zademonstrowania charakterystyk systemu wykonano dwa testy symulatora: w pełni interaktywny test kierowania koparkĄ kołowĄ w nierównym terenie, oraz test kierowania samochodem pasaŻerskim. Co więcej, charakterystyki symulatora majĄce znaczenie praktyczne, takie jak opóźnienie czasowe odpowiedzi symulatora, pasmo sygnału przyspieszenia symulatora wyznaczone przy sztucznym pobudzeniu i z testu kierowania pojazdem zostały zaprezentowane i przedyskutowane.
Źródło:
Archive of Mechanical Engineering; 2014, LXI, 2; 270-285
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing power system protections utilizing hardware-in-the-loop simulations on real-time Linux
Autorzy:
Krakowski, M.
Nogal, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/201732.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hardware-in-the-loop simulation
testing
real time systems
power systems protection
Opis:
The complexity of power system phenomena challenges power system protection testing to obtain the required adequacy of the testing environment. Hardware-in-the-loop simulation in real-time substantially increases testing capabilities. However, there is still the question of the availability of commercial solutions. To address the challenges, a new hardware-in-the loop system has been designed and implemented utilizing the easily available Matlab/Simulink environment and Linux RT Preempt OS. The custom software part prepared for the presented system is based on the Matlab/Simulink s-function mechanism, Embedded Coder toolbox and Advantech biodaq library as the interface for the utilized I/O cards. The simulator’s real-time performance limits on Linux RT Preempt have been verified, and it was shown that its performance is sufficient to conduct successful tests of protection relays. Consequently, a simple power system protection relay testing example is provided, including a discussion of results. Finally, it has been proven that the presented system can be utilized as a simpler and more accessible hardware-in-the-loop testing alternative to commercial simulators.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1099-1105
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LQG/LTR control of input-delayed discrete-time systems
Autorzy:
Horla, D.
Krolikowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/200895.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LQG control
loop transfer recovery
time-delay
Opis:
A simple robust cheap LQG control is considered for discrete-time systems with constant input delay. It is well known that the full loop transfer recovery (LTR) effect measured by error function ∆(z) can only be obtained for minimum-phase (MPH) systems without time-de-lay. Explicit analytical expressions for ∆(z) versus delay d are derived for both MPH and NMPH (nonminimum-phase) systems. Obviously, introducing delay deteriorates the LTR effect. In this context the ARMAX system as a simple example of noise-correlated system is examined. The robustness of LQG/LTR control is analyzed and compared with state prediction control whose robust stability is formulated via LMI. Also, the robustness with respect to uncertain time-delay is considered including the control systems which are unstable in open-loop. An analysis of LQG/LTR problem for noise-correlated systems, particularly for ARMAX system, is included and the case of proper systems is analyzed. Computer simulations of second-order systems with constant time-delay are given to illustrate the performance and recovery error for considered systems and controllers.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1049-1058
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The real-time simulator using MATLAB/Simulink software for closed-loop coordination protection devices testing
Autorzy:
Smolarczyk, Adam
Łapczyński, Sebastian
Szulborski, Michał
Kolimas, Łukasz
Kozarek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2086829.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
real-time simulator
distance protections
protection relays testing
closed-loop testing
MATLAB/Simulink
symulator czasu rzeczywistego
zabezpieczenia odległościowe
testowanie przekaźników zabezpieczeniowych
testowanie w pętli zamkniętej
Opis:
This paper aims to discuss the behavior of the proprietary real-time simulator (RTS) during testing the coordination of distance relay protections in power engineering. During the construction process of the simulator, the mapping of various dynamic phenomena occurring in the modeled part of the power system was considered. The main advantage to the solution is a lower cost of construction while maintaining high values of essential parameters, based on the generally available software environment (MATLAB/Simulink). The obtained results are discussed in detail. This paper is important from the point of view of the cost-effectiveness of design procedures, especially in power systems exploitation and when avoiding faults that result from the selection of protection relay devices, electrical devices, system operations, and optimization of operating conditions. The manuscript thoroughly discusses the hardware configuration and sample results, so that the presented real-time simulator can be reproduced by another researcher.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137413, 1--10
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control problems with a fixed terminal time in linear fractional-order systems
Autorzy:
Gomoyunov, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/1403685.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optimal control
fractional derivatives
linear systems
open-loop control
feedback control
reduction
Opis:
The paper deals with an optimal control problem in a dynamical system described by a linear differential equation with the Caputo fractional derivative. The goal of control is to minimize a Bolza-type cost functional, which consists of two terms: the first one evaluates the state of the system at a fixed terminal time, and the second one is an integral evaluation of the control on the whole time interval. In order to solve this problem, we propose to reduce it to some auxiliary optimal control problem in a dynamical system described by a first-order ordinary differential equation. The reduction is based on the representation formula for solutions to linear fractional differential equations and is performed by some linear transformation, which is called the informational image of a position of the original system and can be treated as a special prediction of a motion of this system at the terminal time. A connection between the original and auxiliary problems is established for both open-loop and feedback (closed-loop) controls. The results obtained in the paper are illustrated by examples.
Źródło:
Archives of Control Sciences; 2020, 30, 4; 721-744
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis for discrete-time fractional-order LTI state-space systems. Part II: New stability criterion for FD-based systems
Autorzy:
Stanisławski, R.
Latawiec, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/200325.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Grünwald-Letnikov fractional difference
discrete-time fractional order system
stability criterion
non-minimum phase system
closed loop stability
Opis:
This paper presents a series of new results on the asymptotic stability of discrete-time fractional difference (FD) state space systems and their finite-memory approximations called finite FD (FFD) and normalized FFD (NFFD) systems. In Part I of the paper, new necessary and sufficient stability conditions have been given in a unified form for FD, FFD and NFFD-based systems. Part II offers a new, simple, ultimate stability criterion for FD-based systems. This gives rise to the introduction of new definitions of the so-called f-poles and f-zeros for FD-based systems, which are used in the closed-loop stability analysis for FD-based systems and, approximately, for FFD/NFFD-based ones.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 363-370
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The combined effect of fractional filter and Smith Predictor for enhanced closed-loop performanceof integer order time-delay systems: some investigations
Autorzy:
Nagarsheth, Shaival Hemant
Sharma, Shambhu Nath
Powiązania:
https://bibliotekanauki.pl/articles/229571.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
generalized fractional controller
Smith predictor
time delay system
generalized inverse
Bode’s ideal transfer function
Opis:
This paper proposes a generalized fractional controller for integer order systems with time delay. The fractional controller structure is so adopted to have a combined effect of fractional filter and Smith predictor. Interestingly, the resulting novel controller can be decomposed into fractional filter cascaded with an integer order PID controller. The method is applied to two practical examples i.e. liquid level system and Shell control fractionator system. The closed-loop responses resulting from the proposed method are compared with that of the available methods in the literature. For quantitative evaluations of the proposed method, Integral Absolute Error (IAE) and Integral Square Control Input (ISCI) performance criteria are employed. The proposed method effectively enhances the closed-loop response by improving the IAE values, reducing the control effort inputs to achieve the desired output. The disturbance rejection and robustness tests are also carried out. The robustness test reveals a significant improvement in the maximum absolute sensitivity measure. That is displayed in numerical simulations of the paper.
Źródło:
Archives of Control Sciences; 2020, 30, 1; 47-76
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and reliability analysis of three phase z-source AC-AC converter
Autorzy:
Prasad, H.
Maity, T.
Powiązania:
https://bibliotekanauki.pl/articles/140661.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
real-time digital simulation (RTDS)
field programming gate array (FPGA)
hardware-in-the-loop (HIL)
z-source ac-ac converter
PID controller
Opis:
This paper presents the small signal modeling using the state space averaging technique and reliability analysis of a three-phase z-source ac-ac converter. By controlling the shoot-through duty ratio, it can operate in buck-boost mode and maintain desired output voltage during voltage sag and surge condition. It has faster dynamic response and higher efficiency as compared to the traditional voltage regulator. Small signal analysis derives different control transfer functions and this leads to design a suitable controller for a closed loop system during supply voltage variation. The closed loop system of the converter with a PID controller eliminates the transients in output voltage and provides steady state regulated output. The proposed model designed in the RT-LAB and executed in a field programming gate array (FPGA)-based real-time digital simulator at a fixedtime step of 10 μs and a constant switching frequency of 10 kHz. The simulator was developed using very high speed integrated circuit hardware description language (VHDL), making it versatile and moveable. Hardware-in-the-loop (HIL) simulation results are presented to justify the MATLAB simulation results during supply voltage variation of the three phase z-source ac-ac converter. The reliability analysis has been applied to the converter to find out the failure rate of its different components.
Źródło:
Archives of Electrical Engineering; 2017, 66, 4; 731-743
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-based method for the combined identification of velocity-loop parameters
Metoda złożonej identyfikacji parametrów pętli sterowania prędkością wykorzystującą właściwości czasowe
Autorzy:
Neugebauer, R.
Hofmann, S.
Hellmich, A.
Schlegel, H.
Powiązania:
https://bibliotekanauki.pl/articles/140194.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
identyfikacja parametrów
model parametryczny
urządzenia kontrolujące pracę serwonapędów
parameters identification
parametric model
motion control
Opis:
Today, a cascaded system of position loop, velocity loop and current loop is standard in industrial motion controllers. The exact knowledge of significant parameters in the loops is the basis for the tuning of the servo controllers. A new method to support the commissioning has been developed. It enables the user to identify the moment of inertia as well as the time constant of the closed current loop simultaneously. The method is based on the auto relay feedback experiment by Aström and Hägglund. The model parameters are automatically adjusted according to the time behaviour of the controlled system. For this purpose, the auto relay feedback experiment is combined with the technique of gradual pole compensation. In comparison to other existing methods, this approach has the advantage that a parametric model for the open velocity loop is derived directly.
We współczesnych przemysłowych układach sterowania ruchem standardowo wykorzystuje się kaskadowe systemy z pętlą sterowania położeniem, prędkością i pętlą prądową. Dokładna znajomość istotnych parametrów pętli jest podstawą dla optymalizacji działania serworegulatorów. Autorzy opracowali nową metodę wspomagającą pozyskiwanie tych danych. Umożliwia ona jednoczesną identyfikację momentu bezwładności i stałej czasu w zamkniętej pętli prądowej. Metoda jest oparta na eksperymencie Aströma i Hägglunda z automatycznym przekaźnikowym sprzężeniem zwrotnym. Parametry modelu są dobierane automatycznie, biorąc pod uwagę właściwości sterowanego systemu w dziedzinie czasu. Wykorzystano w tym celu eksperyment z automatycznym przekaźnikowym sprzężeniem zwrotnym w połączeniu z techniką stopniowej kompensacji biegunów. W porównaniu do innych istniejących metod, zaletą takiego podejścia jest możliwość bezpośredniego wyznaczenia modelu parametrycznego dla otwartej pętli sterowania prędkością.
Źródło:
Archive of Mechanical Engineering; 2011, LVIII, 2; 175-184
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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