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현가장치의 준정적 해석을 이용한 효율적인 차량동역학 해석기법
김상섭(S.S.Kim),최강식(K.S.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Vehicle dynamic modeling and simulation using multibody suspension model is now a standard method to predict the ride and handling performances of vehicles in the design stage. The multibody vehicle dynamics model that correctly include nonlinear geometric and compliance properties of suspension has usually about 100 degress of freedom and requires significant amount of simulation time. The main source of the long simulation time is the high frequency motion of suspension links that are connected with stiff rubber bushings. Since the mass and inertia of the suspension links are relatively small, the inertia forces and moments of the suspension link are negligibly small comparing to the transmitting forces and moments between car body and wheel. Thin paper presents an efficient modeling and analysis method of vehicle suspensions using generalized massless links thar are defined as massless links with own motion variables. The governing dynamic equations of the generalized massless link suspension model are derived, that are composed of a set of differential algebraic equations of motion and quasi-static force equilibrium equation. The force equilibrium equations are solved more efficiently by integrating the velocity equations of motion variables of generalized massless link. A planer 1/4 car model is used as a test example. The simulation results show that the generalized massless link suspension model is effective to eliminate high frequency response and is able to predict correctly the responses of motion as well as joint and bushing forces.<br/>
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차량의 시험개발을 위한 차량 동역학 모델링 및 특성분석방법
김상섭(S.S.Kim),정홍규(H.K.Jung),이종호(J.H.Lee),최강식(K.S.Choi),김중희(J.H.Kim),임세빈(S.B.Im),우현구(H.G.Woo),박홍철(H.C.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
This paper presents an effective modeling and simulation method for vehicle dynamic performance evaluation during test and development process. Each wheel suspension is modeled as translational joint which allows relative translational motion in vertical direction of car body. The neglected kinematic and compliance characteristics of actual suspension are included in the model as functional form in terms of relative wheel displacement or tire force and moment. These characteristics are easily obtained through SPMD test. A vehicle dynamic analysis and performance evaluation software has been developed using Matlab/Simulink. Simulation results for various test conditions shows good correlation with test results<br/>
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