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김동우(D. W. Kim),임종훈(J. H. Lim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.6
The tapered leaf spring is regarded as the adequate tool to improve ride quality and to reduce vehicle weight of commercial vehicles. These effects are due to minimizing the contact area of each leaf by reducing the number of leaves and by optimizing the thickness profile of each leaf. But in adapting the tapered leaf spring to improve ride quality, we often have some problems of bad pitching and bouncing motion. This paper shows the basic properties of tapered leaf spring by rig tests and how to improve ride quality of a vehicle with tapered leaf springs, compared with multi-leaf spring. From the results of vehicle tests and rig tests it is concluded that the ride quality was effected by the dynamic spring rate and the friction of the tapered leaf spring.<br/>
김동우(D. W. Kim),이희욱(H. W. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.6
The frequency of the brake squeal noise can be changed during braking, and this frequency shifting is due to variation of braking deceleration rate. The natural frequency of the brake system also shifted according to deceleration rate. It makes difficult to treat this problem. This paper shows an experimental study on the brake squeal noise having main frequencies of about 450-500Hz. And it shows how to improve the brake squeal noise problem.<br/>
김동우(D.W.Kim),김현수(H.S.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
In this paper, a dynamic control strategy of the CVT speed ratio is investigated. Firstly, dynamic models of the CVT vehicle including shift dynamics, hydraulic control valve, line pressure control module are obtained. Based on the dynamic models, simulation program "ACVTSIM" is developed. Simulation results show that the higher the speed ratio velocity, the better the kick down response and limitation of the speed ratio velocity is required for comport ride when lift foot up occurs.<br/>
김동우(D.W.Kim),김현수(H.S.Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper. a static control strategy of CVT speed ratio is investigated. In order to operate the engine on the optima] operating region corresponding to the driver ’ s desire and the driving condition. a fuzzy control logic is used. In the fuzzy controller, S_factor is suggested which is defined as a degree of sportiness for the normal driving. Also. L_factor is suggested which determines the engine brake capacity for coating ‘<br/> Simulation results show that the fuzzy controller designed in this work selects the optimal driving mode automatically for the driver' s demand and driving condition