• Title/Summary/Keyword: Real-Time Simulation

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REAL-TIME SIMULATION OF A HIGH SPEED MULTIBODY TRACKED VEHICLE

  • YI K. S.;YI S.-J.
    • International Journal of Automotive Technology
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    • v.6 no.4
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    • pp.351-357
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    • 2005
  • Development of a real-time simulation model for high-speed and multibody tracked vehicles is difficult because they involve hundreds of highly nonlinear equations. In the development of a reliable tracked vehicle model for real-time simulation, it is helpful to use an off-line tracked vehicle model developed by considering all the degrees of freedom of each element. This paper presents a step-by-step procedure for the development of a real-time simulation model based on the off-line tracked vehicle model. The road input data, Profile IV, is used for the real time simulation and simulation results are compared with vehicle test results obtained in the military test field. It is noted that the simulation results are quite close to the test results.

A Study on the Real Time Simulation of Continuous Dynamic System Using a Multiprocessor (Multiprocessor를 이용한 연속 동특성계의 실시간 시뮬레이션에 관한 연구)

  • 곽병철;양해원
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.24 no.4
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    • pp.559-567
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    • 1987
  • In this paper, the real time simulation of continuous dynamic system was performed by general integration algorithms using multiprocessor. For the stable simulation, the relation between stability of integration method and integration step-size was investigated from the stability graph. As a typical illustration, the real-time digital simulation and the real-time hard-ware-in-the-loop simulation of flight control system were performed and reviewed. Moreover through the real-time simulation, the design verification and performace test of flight control system could be evaluated. The computer used for simulation is AD10, which is a very high-speed special-purpose computer designed specifically for a time-critical simulation of large and complex models of dynamic systems. The simulation validity is demonstrated by comparing hardware simulation results with software simulation results.

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Development of the Distributed Real-time Simulation System Based on HLA and DEVS (DEVS형식론을 적응한 HLA기반의 분산 실시간 시뮬레이션 시스템 개발)

  • Kim, Ho-Jeong;Lee, Jae-Hyun;Cho, Kil-Seok
    • Journal of the Korea Institute of Military Science and Technology
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    • v.9 no.3
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    • pp.25-32
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    • 2006
  • Weapon systems composed of several subsystems execute various engagement missions in distributed combat environments in cooperation with a large number of subordinate/adjacent weapon systems as well as higher echelons through tactical data links. Such distributed weapon systems require distributed real-time simulation test beds to integrate and test their operational software, analyze their performance and effects of cooperated engagement, and validate their requirement specifications. These demands present significant challenges in terms of real-time constraints, time synchronization, complexity and development cost of an engagement simulation test bed, thus necessitate the use of high-performance distributed real-time simulation architectures, and modeling and simulation techniques. In this paper, in order to meet these demands, we presented a distributed real-time simulation system based on High Level Architecture(HLA) and Discrete Event System Specification(DEVS). We validated its performance by using it as a test bed for developing the Engagement Control System(ECS) of a surface-to-air missile system. The proposed technique can be employed to design a prototype or model of engagement-level distributed real-time simulation systems.

Development of Real-time Simulator for Vehicle Electric Brake System (차량 전자 제동 시스템을 위한 실시간 시뮬레이터 개발)

  • Cheon, Se Young;Choi, Seong Woong;Yang, Soon Yong
    • Journal of Drive and Control
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    • v.16 no.1
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    • pp.22-28
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    • 2019
  • This paper develops ABS braking real - time simulator to develop vehicle braking system by simulation. Recently, real-time simulation is widely used in the development of vehicles to decrease development time. In the field of electronic braking, real-time simulation is actively underway. In order to simulate electronic braking model in real time, a vehicle model, a hydraulic model, and a control S/W model are required. These models must be calculated in one platform. Therefore, in this paper, a vehicle model composed of CarSim and a hydraulic model composed of SimulationX using S/W in actual ABS controller was developed as a Simulink model base and linked with Matlab real time model. Using this real-time model, design effects of the electronic braking controller were simulated according to road surface condition to verify its operability.

An FMI-based Time Management Scheme for Real-time Co-Simulation (실시간 Co-Simulation을 위한 FMI 기반 시간관리 기법)

  • Kyung, Dong-Gu;Joe, Inwhee;Kim, Wontae
    • Journal of IKEEE
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    • v.24 no.2
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    • pp.426-434
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    • 2020
  • FMI is being researched as a standard for linking large-scale simulation of CPS. In order to guarantee the reliability of the results in large-scale simulations using FMI, event handling through time management techniques is required. This paper aims to guarantee real-time performance and accuracy in large-scale co-simulation environments such as CPS. Synchronize the wallclock time and simulation time to ensure real time. Also, to ensure the accuracy, before the simulation, the event is checked and the simulation is performed with the smallest step size while maintaining the real time until the event occurrence time. As a result, the events occurring in the co-simulation environment are processed immediately and sequentially, ensuring the real-time performance and minimizing the numerical integration error by maximizing the simulation resolution. In the experiment, the proposed method was processed immediately, and it was confirmed that the numerical integration error is reduced by about 1/5 unlike the existing time management method which does not guarantee the resolution.

The Real-Time Constructive Simulation With the RM scheduling and Lock-free Shared Objects (RM 스케쥴링과 Lock-Free 공유개체에 의한 실시간 시뮬레이션)

  • 박현규
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.519-522
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    • 1998
  • The Constructive Battle simulation Model is very important to the recent military training for the substitution of the field training. However, real battlefield systems operate under rea-time conditions, they are inherently distributed, concurrent and dynamic. In order to reflect these properties by the computer-based simulation systems which represent real world processes, we have been developing constructive simulation model for several years. The constructive simulation system is one of the famous real-time system software, nd the one common feature of all real-time systems is defined as the correctness of the system depend not only on the logical result of computation, but also on the time at which the results are produced. Conventionally, scheduling and resource allocation activities which have timing constraints are major problem of real-time computing systems. To overcome these constraints, we elaborated on these issues and developed the simulation system on commercially available hardware and operating system with lock-free resource allocation scheme and rae monotonic scheduling.

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Real Weather Condition Based Simulation of Stand-Alone Wind Power Generation Systems Using RTDS

  • Park, Min-Won;Han, Sang-Geun;Yu, In-Keun
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.3
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    • pp.146-152
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    • 2004
  • Cost effective simulation schemes for Wind Power Generation Systems (WPGS) considering wind turbine types, generators and load capacities have been strongly investigated by researchers. As an alternative, a true weather condition based simulation method using a real-time digital simulator (RTDS) is experimented in this paper for the online real-time simulation of the WPGS. A stand-alone WPGS is, especially, simulated using the Simulation method for WPGS using Real Weather conditions (SWRW) in this work. The characteristic equation of a wind turbine is implemented in the RTDS and a RTDS model component that can be used to represent any type of wind turbine in the simulations is also established. The actual data related to weather conditions are interfaced directly to the RTDS for the purpose of online real-time simulation of the stand-alone WPGS. The outcomes of the simulation demonstrate the effectiveness of the proposed simulation scheme. The results also signify that the cost effective verification of efficiency and stability for the WPGS is possible by the proposed real-time simulation method.

Real-time 3D Graphic Simulation of the Spent Fuel Rod Extracting Machine for Remote Monitoring (사용후핵연료봉 인출장치의 원격감시를 위한 실시간 3차원 그래픽 시뮬레이션)

  • 송태길;이종열;김성현;윤지섭
    • Korean Journal of Computational Design and Engineering
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    • v.5 no.4
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    • pp.327-335
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    • 2000
  • The spent fuel rod extracting machine is automatically operated in high radioactive environment, so high reliability of operation is required. In this paper, to enhance the reliability of this machine by providing a close monitoring capability. a real time graphic simulation method is suggested. This method utilizes conventional IGRIP (Interactive Graphics Robot Instruction Program) 3D graphic simulation tool to visualize and simulate the 3D graphic model of this machine. Also, the dedicated protocol is defined for transmission of the operational data of the machine. The real time graphic simulation is realized by developing the socket module between a graphic workstation and a machine control computer through the TCP/IP network and by dividing the 3D graphic simulation GSL(Graphic Simulation Language) program as a small sized sub routine. The suggested method is implemented while automatically operating the rod extracting machine. The result of implementation shows that the real time 3D graphic simulation is well synchronized with the actual machine according to the operational data.

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Performance analysis of mini MAP architecture in real time application by simulation method (실시간 응용시 Mini MAP의 시뮬레이션에 의한 성능해석에 관한 연구)

  • 김덕우;정범진;권욱현
    • 제어로봇시스템학회:학술대회논문집
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    • 1987.10b
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    • pp.382-388
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    • 1987
  • In this paper, the performance of Mini MAP architecture is analyzed by simulation method. Token rotation time and waiting time are obtained by simulation. The results of the simulation are compared with these of the analytic model. From these comparisons, it is shown that simulation results are approximately identical to analytic results. Mini MAP architecture has good real time performances in token rotation time and waiting time and can be used to many real time applications.

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Development of a Real-Time Vehicle Dynamic Simulation Software (실시간 차량 동역학 시뮬레이션 S/W 개발)

  • Choi, G.J.;Lee, K.H.;Yoo, Y.M.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.5
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    • pp.30-37
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    • 1995
  • In this research a real time vehicle dynamic simulation software, to be used on real time vehicle simulators, is developed using relative coordinates and suspension super-element concept. Accuracy of the software is verified through comparisons of simulation results with those of a commercial mechanical system dynamic analysis package. It is demonstrated that real time simulation on a workstation with a 15 D.O.F. vehicle model is possible.

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