不規則路面上を走行する四輪車両の時刻歴,パワースペクトル解析

抄録

This paper deals with a methodology to analyse randem vibration of a vehicle running on a road whose surface is uneven probabilistically. The uneven road is represented as a two-dimensional filtered Poisson process in terms of sinusoidal shape function. The four-wheeled vehicle is modeled as a frame structure, to which the effect of road surface is input through spring-damper systems, in the framework of the finite element method. The shape function of structural response is obtained through mode decoupling by means of complex eigenvalue analysis and time integration of the equation of motion. It turns out that samples of response time history are calculated in addition to response power spectra, without using the coherence function. A numerical example is carried out in regard to a model truck, and time history, power spectrum and frequencies of occurrence of bending mements generated are given.