Optimization Analysis on Full Vehicle Road Noise Based on Substructure Frequency Response Function

Combining substructure theory, an efficient method for frequency response is formulated. The substructure method is confirmed feasible in a simple vehicle model by comparing with the road noise characteristics of substructure and standard method. And then, substructure models for body and chassis system are established respectively for a kind of actual vehicle with the problem of road noise. Subsequently, substructure method is employed to study road noise characteristics for the full vehicle model. In addition, the noise peaks of common characteristics are determined by comparing with simulation and test results, and the peaks are used as optimization objectives; the optimal Latin hypercube method is used to optimize the peaks until all the noise amplitudes of 40–200 Hz frequency band satisfy the target. Significantly, substructure method dramatically increases the optimization efficiency especially to bushing stiffness optimization schemes, the efficiency increases by 98%.