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김우영(W.Y. Kim),안기원(K.W. Ahn),이정환(J.H. Lee),황원걸(W.G. Hwang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
When developing a new vehicle, subjective feeling test is extensively used for the tuning of dampers. This requires a lot of time and efforts. In this study, optimization technique has been applied to suspension damper design for ride comfort. For ride comfort evaluation, PSD(Power Spectral Density) of accelerations at three locations; front, middle, and rear floor are calculated. With the WRMS(Weighted Root Mean Square) as the objective function, damping curves for front and rear suspensions of a large bus have been obtained. These damping curves are compared with those obtained through the subjective feeling test.<br/> <br/>
안기원(K.W.Ahn),안상호(S.H.Ahn),서권희(K.H.Seo),황원걸(W.G.Hwang),윤희석(H.S.Yoon),오철성(Q.S.Oh) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
To evaluate the safety and durability of the vehicle structure in the vehicle developing stage, many times and efforts have been required. It is difficult to find the reason of crack which was occurred in the body and frame of a vehicle during tests. Recently computer aided engineering technology has rapidly<br/> raised to solve the problems of safety and durability of the vehicle.<br/> In this study, dynamic stress analysis is performed to the frame of the vehicle by rigid and flexible<br/> multibody dynamic techniques during bump pass. The results of the analysis are compared to those of the test. The full vehicle dynamic models for the rigid and flexible body are accomplished by DADS; a special code for dynamic analysis. Dynamic stress analysis procedure is also developed using the accomplished dynamic models.
진현수(H.S.Jin),성원석(W.S.Sung),윤민철(M.C.Yun),박은용(E.Y.Park),김기세(K.S.Kim),황원걸(W.G.Hwang) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The purpose of this study is to establish theoretical scheme for engine mount design and to develop an engine mount design program. A six degrees of freedom, rigid body model of engine mount system is developed and the equation of motion for the mount system is derived in this paper. And Engine Mount Design System is implemented with visual basic code through some equations of design principles for engine mount that is derived for 3, 4, 5 and 6 point support. EMDS was applied for minibus. Also, the result of EMDS was compared with current design, and EMDS was verified that it is useful tool through making a comparison between the analysis with EMDS and the experiment in vibration characteristics of mount system.<br/>
김기세(K.S.Kim),황원걸(W.G.Hwang) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
This study developes a torsional vibration model of heavy duty truck drive line for simulation of a rattling noise, which is very annoying to driver at the full load condition. A 10 d. o. f. lumped parameter nonlinear torsional model is constructed and engine torque is calculated from P - 9 diagram. Time responses are simulated and compared with test results, which show a peak in the fft plots at the frequency of a 2nd harmonics of shaft revolution.<br/>
대형 차량의 ABS(Anti-lock Brake System)에 관한 연구
정병만(B.M.Jung),안기원(K.W.Ahn),황원걸(W.G.Hwang) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
This paper describes the ABS(Anti-lock Brake System) characteristics to a large vehicle in braking. The full vehicle dynamic model was made with sprung mass, brake system, and wheels including control algorithms. Control algorithms were designed for the wheel accelerations and slip ratio and applied to the front and rear wheels independently. Simulation was also performed to the dry asphalt and slippery roads at the speed of 50km/hr. The results of simulation to the ABS system were compared to the results of test.<br/>
김기세(K.S.Kim),임형은(H.E.Im),황원걸(W.G.Hwang) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper develops a 11 d.o.f. dynamic model, and analyze the ride comfort of a vehicle. The dynamic model is derived with MATHEMAT1CA program and C language. The time responses over several deterministic roads are simulated, and the frequency response for probabilistic irregular road are examined. The computational results were compared with the test results, which showed good agreements. The index of ride comfort considering the equal comfort curve of human body is used to investigate the effect of parameter change.<br/>
차량 구동계 비틀림 진동 해석 시스템의 개발에 관한 연구
김기세(K.S.Kim),양상훈(S.H.Yang),황원걸(W.G.Hwang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
A computer aided analysis system is developed for analyzing the driveline torsional vibration of a vehicle. Investigating general torsional vibration systems, 10 types of module are developed and the results are implemented using C++ language. 10 d.o.f. torsional vibration system and 4 d.o.f. idle rattle system are modeled and simulated with this system. Their responses for engine torque excitation are evaluated on time and frequency domain, and the results are compared with test results favorably.