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[동력전단계부문] 차량의 조종안정성 해석시스템을 이용한 설계변수의 영향에 관한 연구
임형은(H.E.Im),김우영(W.Y.Kim),안기원(K.W.Ahn),황원걸(W.G.Hwang) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An analysis system of a vehicle handling performance is developed. The analysis system can simulate driving tests to evaluate the vehicle handling performance. A 3-dimensional nonlinear vehicle model with a steering system is proposed. Based on this vehicle model, driving tests are simulated. With the analysis system, the handling performance of a large bus that has a front and rear rigid axle is evaluated. The influence of de sign parameters on handling performance is investigated<br/> The vehicle model has 13 degrees of freedom which are 10 degrees of motion in sprung and unsprung mass and 3 degrees of freedom in steering system. A driver model was developed using PID and fuzzy controller to steer the vehicle along a prescribed path during a closed loop simulation. Good agreement was obtained between experimental and simulated results in single lane change.<br/> To evaluate the vehicle handling performance, the vehicle handling characteristics were classified as follows: (I) steering characteristics and characteristic velocity; (2) response time and amplification; (3) frequency response. The influence of front suspension spring stiffness, damping constant, steering overall ratio, and rear tire concerning stiffness on handling performance was investigated. Results of the developed program were compared with those of DADS, a commercial program for multibody dynamics analysis. Good agreement was obtained between results of the developed program and DADS in a parameter study
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.
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/>