• Title, Summary, Keyword: Dynamic Simulation

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HILS(Hardware-In-the-Loop Simulation) Development of a Steering HILS System (전동식 동력 조향 장치 시험을 위한 HILS(Hardware-In-the-Loop Simulation) 시스템 개발)

  • 류제하;노기한;김종협;김희수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.9
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    • pp.105-111
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    • 1999
  • The paper presents development of a Hardware-In-the-Loop simulation (HILS) system for the purpose of testing performance, stability, and reliability of an electronic power steering system(EPS). In order to realistically test an EPS by the proposed HILS apparatus, a simulated uniaxial dynamic rack force is applied physically to the EPS hardware by a pnumatic actuator. An EPS hardware is composed of steering wheel &column, a rack & pinion mechanism, andas motor-driven power steering system. A command signal for a pneumatic rack-force actuator is generated from the vehicle handling lumped parameter dynamic model 9software) that is simulated in real time by using a very fast digital signal processor. The inputs to the real-time vehicle dynamic simulation model are a constant vehicle forward speed and from wheel steering angles driven through a steering system by a driver. The output from a real-time simulation model is an electric signal that is proportional to the uniaxial rack force. The vehicle handling lumped parameter dynamic model is validated by a fully nonlinear constrained multibody vehicle dynamic model. The HILS system simulation results sow that the proposed HILS system may be used to realistically test the performance stability , and reliability of an electronic power steering system is a repeated way.

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An Integrated Simulation Method to Support Virtual Factory Engineering

  • Zhai, Wenbin;Fan, Xiumin;Yan, Juanqi;Zhu, Pengsheng
    • International Journal of CAD/CAM
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    • v.2 no.1
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    • pp.39-44
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    • 2002
  • This paper presents a structure and architecture of an integrated simulation method (ISM) to meet the requirements of virtual factory engineering (VFE). Combining CAD, VR and discrete event simulation techniques, the ISM provides static and dynamic simulation functions for implementation of VFE throughout the lifecycle. The static simulation can be used to evaluate the factory layout. The dynamic simulation enables us to evaluate ergonomics of factory, process performance of production system, feasibility of production plan and operation of factory, and to train operators safely, which cover the whole VFE lifecycle. The principles of the key techniques of VFE, including virtual factory data management system (VFDMS), static and dynamic simulation, are also discussed. To demonstrate and validate the ISM, a case study has been carried out in an assembly factory.

Dynamic Characteristics Analysis of Stacker Crane for Automatic Warehouse(I) (자동창고용 스태커 크레인의 동특성 해석(I))

  • Shin, Sang-Ryong;Lee, Yun-Sig;Kim, Jong-Jun;Lee, Ho-Taek;Lee, Sang-Hul;Yun, Suk-Ho
    • Proceedings of the KSME Conference
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    • pp.428-435
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    • 2001
  • In this paper, the design factors of stacker crane for the automatic warehouse are verified by dynamic simulation process. Simulation model is designed as the form of rigid elements and discrete flexible beam connections. The various result for structural design of stacker crane is produced by dynamic simulation and experiment. For the simulation of structural dynamics, ADAMS which is a software for kinematic & dynamic simulation, is used. In order to verify the analysis method, simulation and experiment result are compared.

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The dynamic production scheduling on flexible flowshop systems using simulation (유연흐름 생산시스템에서의 시뮬레이션을 이용한 동적일정계획 연구)

  • 우훈식
    • Journal of the Korea Society for Simulation
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    • v.5 no.2
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    • pp.1-12
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    • 1996
  • Utilizing the simulation approaches, the dynamic production scheduling system FOLS(Flexible flowshop On-Line Simulation) is developed under the flexible flowshop environment. When an interruption such as machine failure/recovery is occurred at the shop floor, the FOLS system performs evaluations for job selection rule oriented alternatives, and generates a dynamic production schedule based on the collected current shop floor data. For the case study, the FOLS system is applied to the printed circuit card assembly(PCCA) line and simulation results are reported.

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Dynamic Simulation of Underwater Vehicle-Manipulator Systems Using Principle of Dynamical Balance (동적 발란스의 원리를 이용한 수중 잠수정-매니퓰레이터 시스템의 동역학 시뮬레이션)

  • Han, Jong-Hui;Chung, Wan-Kyun
    • The Journal of Korea Robotics Society
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    • v.2 no.2
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    • pp.152-160
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    • 2007
  • In this paper, two schemes are introduced for dynamic simulation of underwater robotic systems. One is principle of dynamical balance, which is an easy and powerful tool for formulating dynamic equations of composite systems such as underwater vehicle-manipulator system. In the dynamic modeling, this principle gives us the closed-form of dynamic equations on matrix Lie group. The other is geometric integration algorithm, called 4-th order explicit Munthe-Kaas method. By this method, the derived differential equations can be integrated preserving geometric structure. Adopting these two schemes, dynamic simulation of underwater vehicle- manipulator system can be conducted more easily and more reliably.

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A Dynamic Simulation of Voltage Instability Using EMTP (EMTP를 이용한 전압 불안정 현상의 동적 시뮬레이션)

  • 허정용;김철환
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.6
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    • pp.295-300
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    • 2003
  • Voltage instability has been studied for some decade now. But, There is not generally accepted definition of voltage instability because of the complex phenomenon and the variety of ways in which it can manifest itself. Both IEEE and CIGRE have the respective definitions. The areas of voltage instability research are the analysis, simulation and countermeasure of voltage instability. It needs to model the components of the power system to simulate the voltage instability and voltage collapse. At the beginning, the static simulation was used. This method provides the voltage stability indices and it requires less CPU resource and gives much insight into the voltage and power problem. However, it is less accurate than the dynamic simulation peformed in the time domain simulation. So, when it appears difficult to secure the voltage stability margin in a static stability, it is necessary to perform the dynamic simulation. To perform time-domain simulation, we have to model the dynamic component of the power system like a generator and a load. The dynamic simulation provides the accurate result of the voltage instability. But, it is not able to provide the sensitivity information or the degree of stability and it is time consuming and it needs much CPU resource. In this Paper, we perform a dynamic simulation of voltage instability and voltage collapse using EMTP MODELS. The exponential load model is designed with MODEIS and this load model is connected with test power system. The result shows the process of voltage change in time domain when the voltage instability or voltage collapse occurs.

Implementation of virtual plant using module concept for the dynamic simulation of drum type boiler (드럼형 보일러의 동특성 해석을 위한 모듈 개념의 가상 플랜트 구현)

  • 남채호;권상혁;노태정;이광식
    • 제어로봇시스템학회:학술대회논문집
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    • pp.476-479
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    • 1997
  • The focus of this paper is to implement of virtual plant using module concept for the dynamic simulation of drum type boiler and to simulate the control trends of dynamic characteristics. MAtlab & Simulink is used for implement virtual plant & analyzation the dynamics & control trends. They are available for analyzing the dynamic characteristics of drum type Boiler by means of applying well measured data to virtual plant.

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Development of the VR Simulation System for the Dynamic Characteristics of the Adaptive Cruise Controlled Vehicle (ACC 차량의 동특성 해석을 위한 VR 시뮬레이션 시스템 개발)

  • Kwon, Seong-Jin;Jang, Suk;Yoon, Kyoung-Han;Suh, Myung-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.4
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    • pp.163-172
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    • 2004
  • Nowadays, to analyze the dynamic characteristics of the automotive driving system, the computer simulation linked up with VR(Virtual Reality) technology is treated as the useful method with the improvement of computing ability. In this paper, the VR simulation system has been developed to investigate the driving characteristics of the ASV(Advanced Safety Vehicle) equipped with an ACC(Adaptive Cruise Control) system. For the purpose, VR environment which generates 3D graphic and sound information of the vehicle, the road, the facilities, and the terrain has been organized for the driving reality. Mathematical models of vehicle dynamic analysis including the ACC model have been constructed for computer simulation. The ACC modulates the throttle and brake functions to regulate the vehicle speed so that vehicles could keep proper spacing. Also, the real-time simulation algorithm synchronizes vehicle dynamic simulation with the graphic rendering. With the developed VR simulation system, simple scenarios are applied to analyze the dynamic characteristics. It is shown that the VR simulation system could be useful to evaluate the adaptive cruise controlled vehicle on various driving conditions.

Vehicle Dynamic Characteristics according to the Coherence of Road Roughness between Left and Right Wheels (좌우 바퀴 노면 거칠기 상관도가 차량 운동 특성에 미치는 영향)

  • Choi, Gyoo-Jae;Jang, Bong-Choon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.120-126
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    • 2006
  • Vehicle dynamic simulation has been carried out using the coherence of road roughness between left and right wheels. The generated twin tracks with the coherence of road roughness between left and right wheels are in good agreements with the measured coherence relation of left and right wheels. And these tracks reflect well on the roughness characteristics of real roads. Using the generated roads and multibody dynamic simulation program, vehicle dynamic simulation is performed. The vertical and roll motion analysis of a vehicle are carried out using the realistic road profiles with the coherence between left and right wheels and the results are in good agreements with the dynamic characteristics of a vehicle.