Treatment of frequency dependent complex stiffness of rubber bushings in transmission force analysis of a vehicle suspension system by commercial multi-body dynamics programs

摘要

In order to estimate the forces transmitted onto the cabin in a running vehicle, we need to have proper dynamic models for the vibration isolation components such as rubber bushings. Typically the conventional Voigt model is used in commercial programs. However, this model has limitations in reflection of the frequency dependent characteristics of the vibration isolation components. In this paper, a model called transfer function model here, which can reflect better the frequency dependent complex stiffness and match well with the commercial programs is suggested. Performance of the derived model in dynamic analysis of a vehicle suspension system is illustrated by comparing with the results obtained by taking the Voigt model.