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차량 승차감에 미치는 공차의 영향 분석을 위한 해석적 방법
김범석(Beomseok Kim),김봉수(Bongsoo Kim),유홍희(Honghee Yoo) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Drivers are exposed to the vehicle vibration which mostly originates from the interaction between the road and the vehicle. Vibration can cause discomfort, fatigue, and sometimes even injury to a driver. So, the vehicle ride comfort is one of the most important performance indices to achieve a qualitatively excellent vehicle design. From the previous research works, it is obvious that the ride comfort is affected by various parameters of a vehicle model. Therefore. the effects of the parameters on the ride comfort need to be evaluated quantitatively based on the whole-body vibration of the vehicle. An analytical method to analyze the tolerance effects of major vehicle parameters on the vehicle ride comfort is proposed in this paper. The weighted RMS values of the acceleration PSD of a seat position are employed to define the ride comfort. The equations of motion and the sensitivity equations are derived based on a 5DOF vehicle model.
서브프레임 등가모델을 이용한 전차량 모델의 진동특성 분석 방법
김범석(Bumsuk Kim),김봉수(Bongsoo Kim),배경일(Kyungil Bae),유홍희(Honghee Yoo) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The large structure, such as passenger vehicle or aircraft, cannot be modeled into simple vibration system because the various substructures were complicatedly combined each other. So, the finite element method technique is generally used to model and simulate the physical behavior of bodies with arbitrary shape. However, FE analysis requires a huge amount of computation time and cost to construct the analysis model. Accordingly, the vibration characteristics of large structural systems are often analyzed using the component mode synthesis techniques which is one of the substructure synthesis methods. The component mode synthesis (CMS) method is adopted to reduce the number of degrees of freedom of structures composed of two or more substructures, without losing the mean physical characteristics of the structure. In this study, an analysis of vibration characteristics of passenger vehicle applying substructure synthesis method is performed. The passenger vehicle model, consisting of a vehicle body, suspension systems and sub-frame, is presented. The physical parts of the vehicle system are idealized as equivalent substructures using the Craig-Bampton method of CMS. Vibration characteristics, such as modal results and frequency response, of the vehicle system are obtained. The effects of some design parameters variations on the vibration characteristics of full vehicle model are also investigated.