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[차량운동성능부문] Tractor-Semitrailer 차량의 제동특성 프로그램 개발
서명원(Myungwon Suh),박윤기(Yoonki Park),권성진(Seongjin Kwon),양승환(Seunghwan Yang),박병철(Byungchul Park) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and when the road is wet or slippery. Under these conditions, the truck can spin out or the tractor can jackknife or the trailer can swing out. To design the air brake system for the commercial vehicle, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration.<br/> In this study, mathematical models of the tractor-semitrailer and the air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the program. Designers can use this simulation program for understanding the braking characteristics such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.
가상주행시험장(SVPG) 개발: Ⅰ. 가상주행시험장의 시스템 구성 및 운영
서명원(Myungwon Suh),구태윤(Taeyun Koo),권성진(Seongiin Kwon),신영수(Youngsu Shin),조기용(Kiyong Cho),박대유(Daeyu Park) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
By using modeling and simulation, today's design engineers are simultaneously reducing time to market and decreasing the cost of development, while increasing the quality and reliability of their products. A driving simulator is the best example of this method and allows virtual designs of control systems, electronic systems, mechanical systems and hydraulic systems of a vehicle to be evaluated before costly prototyping.<br/> The objective of this paper is to develop the virtual proving ground using a driving simulator and to show its capabilities of an automotive system development tool. For this purpose, including a real-time vehicle dynamics analysis system, the PC-based driving simulator and the virtual proving ground are developed by using VR(Virtual Reality) techniques. Also ABS HIL(Hardware-In-the-Loop) simulation is performed successfully.<br/>
Tractor-Semitrailer 차량의 제동특성 프로그램 개발
서명원(Myungwon Suh),박윤기(Yoonki Park),권성진(Seongjin Kwon),양승환(Seunghwan Yang),박병철(Byungchul Park) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.2
Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and when the road is wet or slippery. Under these conditions, the truck can spin out or the tractor can jackknife or the trailer can swing out. To design the air brake system for the commercial vehicle, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration.<br/> In this study, mathematical models about the tractor-semitrailer and the air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the program. Designers can use this simulation program for understanding the braking characteristics such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.
기상주행시험장(SVPG) 개발: 가상주행시험자의 시스템 구성 및 운영
서명원(Myungwon Suh),구태윤(Taeyun Koo),권성진(Seongjin Kwon),신영수(Youngsu Shin),조기용(Kiyong Cho),박대유(Daeyu Park) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.1
By using modeling and simulation. today's design engineers are simultaneously reducing time to market and decreasing the cost of development. while increasing the quality and reliability of their products. A driving simulator is the best example of this method and allows virtual designs of control systems. electronic systems, mechanical systems and hydraulic systems of a vehicle to be evaluated before costly prototyping. The objective of this paper is to develop the virtual proving ground using a driving simulator and to show its capabilities of an automotive system development tool. For this purpose, including a real-time vehicle dynamics analysis system, the PC-based driving simulator and the virtual proving ground are developed by using VR(Virtual Reality) techniques. Also ABS HIL(Hardware-In-the-Loop) simulation is performed successfully.
서명원(Myungwon Suh),박윤기(Yoonki Park),권성진(Seongjin Kwon) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.6
Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and the road is wet or slip- pery. To design the air brake system for commercial vehicles, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration.<br/> In this study, mathematical models about an 8 X 4 vehicle and an air brake system including an ABS con- troller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the computer program. Designers can use this simulation program for understanding the braking characteristics of 8 X 4 commercial vehicles such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.<br/>
차체단면설계를 위한 단면계수법 및 단면형상법의 성능비교에 관한 연구
서명원(Myungwon Suh),이정환(Junghwan Lee) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.1
Section design of vehicle structure has been developed by two methods. One is the section property method which uses section property as a design variable. This method shows the tendency of an optimum section approximately. The other method is the section shape method which utilizes geometric parameter of section as a design variable. Practical solutions are obtained by this method. However, it is very expensive for large-scale problems due to the large number of geometric parameters. These two methods are compared through several sample problems. The finite element method is used for the structural and sensitivity analyses. The results are analyzed based on the number of function evaluations, the quality of cost function, the complexity of programing, and etc. The applications of both methods are also discussed.
자동변속기 장착 차량의 아이들 셰이크 진동 성능 개선 대책에 대한 고찰
최천(Cheon Choi),서명원(Myungwon Suh),김영진(Youngjin Kim) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.4
In order to improve the vibration characteristics of mid sized passenger car automatic transmission at idle, experimental and theoretical studies have been carried out. Idle shake in D range occurs by various reasons such as characteristics of body bending, resonance between subsystems and engine mounts, etc. Using full vehicle finite element analyses and modal tests, we introduce the way to reduce the idle shake in the early design stage. It shows that the exciting forces are the 2nd order torque and force of engine. A powertrain system modes in D range are entirely effected by the additional boundary conditions of drive line. As a result, the frequencies of subsystems are arranged to be lined up at the idle frequency range in order to avoid the resonances with subsystems. To reduce the idle shake, mounts of radiator are tuned to act as a dynamic damper to 1st bending frequency of the body. In addition, a hydraulic mount which is optimized by Phase Shift Method is applied to the rear engine mount.