• Title/Summary/Keyword: Real-time Simulation

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Study on the parallel processing algorithms with implicit integration method for real-time vehicle simulator development (실시간 차량 시뮬레이터 개발을 위한 암시적 적분기법을 이용한 병렬처리 알고리즘에 관한 연구)

  • 박민영;이정근;배대성
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.497-500
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    • 1995
  • In this paper, a program for real time simulation of a vehicle is developed. The program uses relative coordinates and BEF(Backward Difference Formula) numerical integration method. Numerical tests showed that the proposed implicit method is more stable in carring out the numerical integration for vehicl dynamics than the explicit method. Hardware requirements for real time simulation are suggested. Algorithms of parallel processing is developed with DSP (digital signal processor).

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Development and Implementation of Real Time Multibody Vehicle Dynamics Model (실시간 다물체 차량 동역학 모델 개발 및 구현)

  • O, Yeong-Seok;Kim, Seong-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.5
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    • pp.834-840
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    • 2001
  • A real time multibody vehicle dynamics model has been developed and implemented using a subsystem synthesis method based on recursive formulation. To verify real time simulation capability the developed model has been applied to HMMWV(High Mobility Multipurpose Wheeled Vehicle) with steering system. For the kinematically driven steering system, the coupled front suspension-steering subsystem can be decoupled into two SLA suspension subsystems, which improves the efficiency of simulation. To investigate theoretical efficiency, operational counting method has been also employed to compare the proposed model with the conventional recursive dynamics model. Various simulations such as unsymmetric bump run, step steering(J-turn) and sine steering input test have been carried out to verify the real time feasibility of the proposed model.

A Design of Real-time VOD Server Simulator (실시간 VOD 서버 시뮬레이터 설계)

  • 정지영;김성수
    • Journal of the Korea Society for Simulation
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    • v.9 no.3
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    • pp.65-75
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    • 2000
  • In recent years, significant advances in computers and communication technologies have made multimedia services feasible. As a result, various queuing models and cost models on architecture and data placement for multimedia server have been proposed. However, these analytical techniques use only probabilistic models to represent the behavior of a system, and then they have several limitations like accuracy. Simulation is a viable alternative to analytical model. It avoids many of the limitations associated with analytical techniques, allowing for more precise representation of system attributes like workload in program code. In this paper, we propose a simulation test bed that can evaluate performance of real-time multimedia server by using simulation model.

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A co-simulation study on a control system with the matlab toolbox for OSEK-OS (OSEK-OS를 위한 Matlab 도구상자와 제어시스템의 연계 모의실험에 관한 연구)

  • Kim, Seung-Hoon;SunWoo, Myoung-Ho
    • Proceedings of the KIEE Conference
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    • 2001.11c
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    • pp.149-151
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    • 2001
  • In real-time control system, it is essential to confirm the timing behavior of all tasks because these tasks of real-time controller have to finish their processes within the specified time intervals called a deadline. In order to satisfy this objective, the timing analysis of a real-time system such as a schedulability test must be performed during the system design phase. This paper presents a Matlab toolbox for simulation of real-time control system based on OSEK-OS, which is one of the most widely adopted real-time operating systems in automotive industry. The toolbox allows the user to explore the timely behavior of control algorithms, and to study the interaction between the object of the OSEK-OS, such as task, scheduler and resource etc.

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Real-Time Communication using TMO(Time-Triggered and Message-Triggered Object) in Distributed Computing Systems

  • Kim, Gwang-Jun;Kim, Chun-Suk;Kim, Yong-Gin;Yoon, Chan-Ho;Kim, Moon-Hwan
    • Journal of information and communication convergence engineering
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    • v.1 no.1
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    • pp.12-22
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    • 2003
  • Real-time(RT) object-oriented(OO) distributed computing is a form of RT distributed computing realized with a distributed computer system structured in the form of an object network. Several approached proposed in recent years for extending the conventional object structuring scheme to suit RT applications, are briefly reviewed. Then the approach named the TMO (Time-triggered Message-triggered Object) structuring scheme was formulated with the goal of instigating a quantum productivity jump in the design of distributed time triggered simulation. The TMO scheme is intended to facilitate the pursuit of a new paradigm in designing distributed time triggered simulation which is to realize real-time computing with a common and general design style that does not alienate the main-stream computing industry and yet to allow system engineers to confidently produce certifiable distributed time triggered simulation for safety-critical applications. The TMO structuring scheme is a syntactically simple but semantically powerful extension of the conventional object structuring approached and as such, its support tools can be based on various well-established OO programming languages such as C++ and on ubiquitous commercial RT operating system kernels. The Scheme enables a great reduction of the designers efforts in guaranteeing timely service capabilities of application systems

Automatic real-time system of the global 3-D MHD model: Description and initial tests

  • Park, Geun-Seok;Choi, Seong-Hwan;Cho, Il-Hyun;Baek, Ji-Hye;Park, Kyung-Sun;Cho, Kyung-Suk;Choe, Gwang-Son
    • Bulletin of the Korean Space Science Society
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    • 2009.10a
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    • pp.26.2-26.2
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    • 2009
  • The Solar and Space Weather Research Group (SOS) in Korea Astronomy and Space Science Institute (KASI) is constructing the Space Weather Prediction Center since 2007. As a part of the project, we are developing automatic real-time system of the global 3-D magnetohydrodynamics (MHD) simulation. The MHD simulation model of earth's magnetosphere is designed as modified leap-frog scheme by T. Ogino, and it was parallelized by using message passing interface (MPI). Our work focuses on the automatic processing about simulation of 3-D MHD model and visualization of the simulation results. We used PC cluster to compute, and virtual reality modeling language (VRML) file format to visualize the MHD simulation. The system can show the variation of earth's magnetosphere by the solar wind in quasi real time. For data assimilation we used four parameters from ACE data; density, pressure, velocity of solar wind, and z component of interplanetary magnetic field (IMF). In this paper, we performed some initial tests and made a animation. The automatic real-time system will be valuable tool to understand the configuration of the solar-terrestrial environment for space weather research.

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Deadline Handling in Real-Time Distributed Object Oriented Programming of TMO

  • Kim, Hee-Chul;Na, Sang-Dong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.6
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    • pp.863-872
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    • 2002
  • Real-time(RT) object-oriented(00) distributed computing is a form of RT distributed computing realized with a distributed computer system structured in the form of an object network. Several approached proposed in recent years for extending the conventional object structuring scheme to suit RT applications, are briefly reviewed. Then the approach named the TMO(Time-triggered Message-triggered Object) structuring scheme was formulated with the goal of instigating a quantum productivity jump in the design of distributed time triggered simulation. The TMO scheme is intended to facilitate the pursuit of a new paradigm in designing distributed time triggered simulation which is to realize real-time computing with a common and general design style that does not alienate the main-stream computing industry and yet to allow system engineers to confidently produce certifiable distributed time triggered simulation for safety-critical applications. The TMO structuring scheme is a syntactically simple but semantically powerful extension of the conventional object structuring approached and as such, its support tools can be based on various well-established 00 programming languages such as C++ and on ubiquitous commercial RT operating system kernels. The Scheme enables a great reduction of the designers efforts in guaranteeing timely service capabilities of application systems.

Real-Time Simulation of an Excavator Considering the Functional Valves of the MCV (MCV의 기능밸브를 고려한 굴삭기의 실시간 시뮬레이션)

  • Im, Yong-Hyeon;Lee, Sang-Wook;Cho, Min-Gi;Shin, Dae-Young;Hwang, Sung-Ho
    • Journal of Drive and Control
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    • v.16 no.4
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    • pp.38-47
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    • 2019
  • In this paper, a real-time simulation model of an excavator using Amesim was proposed, considered the operation of functional valves with the main control valve (MCV). The hydraulic system models including the pump and MCV have been developed. The kinematic and dynamic models of the manipulator have also been developed, to confirm the behavior of the excavator. The MCV model includes various functional valves such as the regenerative valves, holding valves, swing and boom priority valves, and regen-cut valves so that simulations similar to real excavators can be performed. Additionally, to obtain the real-time calculation performance, the parts with no major influence on the dynamic behavior were simplified, high frequency factors were removed, and parameters were optimized. The models were compared with each other through the numerical analysis with variable time-step and fixed time-step, and the results were verified by comparison with the results of the actual vehicle tests.

Real-Time Terrain Rendering using Quadtree Wavelet Transform (쿼드트리와 웨이블릿 변환을 이용한 실시간 지형 렌더링)

  • 한정현;박헌기;정문주
    • Journal of the Korea Society for Simulation
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    • v.10 no.3
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    • pp.95-103
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    • 2001
  • Rendering of 3D terrain data in real-time is difficult because of its large scale. So, it is necessary to use level-of-detail(LOD) that uses fewer data, but makes almost similar image to the original. We present an algorithm for real-time LOD generation and rendering of 3D terrain data. The algorithm applies wavelet transform to the terrain data, and then generates quadtree based view-dependent LOD using wavelet coefficients that are the output of wavelet transform. It also uses frame-to-frame coherence and view culling for high frame rates.

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Development of an Real-time Multi-machine Power System Simulator using Personal Computers and Fast Ethernet (개인용 컴퓨터와 고속 이더넷을 이용한 다기 다모선 전력 시스템 실시간 시뮬레이터 개발에 관한 연구)

  • Kim, Joong-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.1
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    • pp.63-68
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    • 2009
  • As the complexity of the power system becomes higher, tests of the new devices, such as exciter and PCS(Power Conversion System) of the distributed generation sources, in the real operating condition are more important. However tests of the unverified devices in the real power system may cause hazardous malfunction of the system. In order to avoid this problem, power devices may be tested with the real-time simulators instead of the real power system. This paper presents an real-time multi machine power system simulator using PCs(Personal Computer) and Fast Ethernet. Developed real-time simulator performs the electro-mechanical dynamic simulation of multi-machine power system by the network distributed computing technique. Because the simulator consists of usual PCs and Fast Ethernet, it is possible to make up a simulation system very cheaper than the conventional real-time simulator which consists of dedicated expensive hardware devices. The performance of the developed simulator is tested and verified with the scaled model excitation system. The test which adjust the control parameters of the exciter is performed with the well-known New England 10 generator 39 bus sample power system.