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[차량운동성능부문] 차량 동역학을 고려한 차량용 댐퍼 해석 프로그램 개발
고유석(Yoyseok Koh),조길준(Giljoon Cho),심정수(Jeongsoo Shim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The shock absorber is an important automotive part, which affect the comfort and the stability of the vehicle. In this paper, a physical model is developed to accuont for the nonlinear behavior of the auto-motive shock absorber. The quarter and half car models are constructed with the commercial GUI(Graphic User Interface) package. Instead of using a simple damper model with a damping coefficient, a shock absorber model which considers the compressibility of the oil and the variable gas phase in the shape of the bubbles, is linked with the vehicle model.<br/> Under the several driving conditions such as ride and steering motion, the internal architecture(valve parameters and hysterisis effects) of the damper and the vehicle motion are identified. This program can be applied to the design and the analysis of the various automotive shock absorber which affects the vehicle dynamics.
지영춘(Youngchun Ji),정인승(Inseung Chung),전남일(Namil Jeon),윤기현(Kihyun Yoon),심정수(Jeongsoo Shim),최승렬(Seungryul Choi) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Brake judder in automotive vehicle is defined as low frequency vibration around 20Hz caused by disc thickness<br/> variation of disc brake. This paper is focused on developing simulation model to analyze the transfer pass of brake<br/> judder phenomenon of chassis system, which is composed of suspension, steering, brake systems. A dynamic model<br/> of half car system was constructed with ADAMS software and validated by experimental data in chassis dynamometer<br/> test.
ER 유체를 이용한 회전식 약실 축계의 비틀림 진동 제어
임승철(Seungchul Lim),김기갑(Kikap Kim),길성진(Seongjin Kil),심정수(Jeongsoo Shim),차기업(Kiup Cha) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.1
간헐 회전식 약실 계가 화력 대 무장 공간의 비율 관점에서 볼 때 중구경 자동포에 크게 유익하다고 보고되었다. 그러나 약실계의 핵심 부품인 평행 인덱스가 인덱스 터릿에 설치되는 캠종동절의 상대적으로 낮은 횡 강성으로 인하여 비틀림 방향으로 유연해지는 경향이 있으며, 이는 결국 터릿과 약실 사이의 연결 축이 상당한 크기의 비틀림 잔류 진동에 노출되어 탄 장전과 발사 시에 심각한 비정렬 문제를 야기시킬 수 있다. 이러한 맥락에서 본 논문에서는 상기 진동을 억제하는 ER유체 작동기와 그에 적합한 반능동 제어 알고리듬을 제안하게 되었으며, 전체 계의 수학적 모델링과 컴퓨터 시뮬레이션을 통하여 그 성능이 만족스러움을 입증하였다. It is reported that an intermittently rotating chamber system will improve the ratio of firepower to armament space in the case of mid-calibre automatic guns. However, the parallel index, which is a main component of the system, tends to be torsionally flexible due to the low lateral stiffness of cam followers on the index turret. This may cause the shaft system connecting the turret with the chamber prone to considerable residual torsional vibration so that serious misalignment problems occur during ammunition loading and firing processes. Herein, an electrorhelogical (ER) fluid actuator that can suppress such vibrations and the associated semiactive control algorithm are proposed. By mathematical modeling and computer simulations, the performance of the entire system is proved satisfactory.
조향시스템의 랙-피니언(Rack&Pinion) 래틀(Rattle)소음 저감에 관한 연구
한민규(Mingyu Han),김승중(Seungjoong Kim),이재용(Jaeyong Lee),김광일(Kwangil Kim),송준규(Jungyu Song),심정수(Jeongsoo Shim),길성진(Seongjin Kil) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper addresses a modification for reducing rattle noise of an CEPS(Column type Electric Power Steering) system. To simulate rattle noise of the steering system, analytical test rig including rack bar, pinion shaft, tie rods, support yoke assembly and rack housing for rack and pinion system and motor, worm wheel and worm gear for reduction system is made with ADAMS. Then, vehicle test is carried out for input data like left/right side forces, left/right vertical accelerations and handle angle to the analytical model. Analytical results and vehicle test results show a good relationship. Based on the analytical model, to reduce rattle noise of rack and pinion part, a cam-type yoke system that has a self-adjusting function is added to the analytical model. The modified system shows a good rattle performance in vehicle test as well as the analytical model.