Use of Fourier transform for defining diagnostic parameters of car wheel

In this paper the problem of wheel imbalance is taken into consideration. An approach is presented based on spectral analysis of acceleration measured on vehicle chassis. The goal is to work out an analytical and theoretical basis for design of relatively cheap diagnostic devices for diagnostic during drive in normal road traffic conditions. It was proven that the chassis vibration amplitude are correlated with wheel imbalance and the frequency at which main peak occurs in amplitude spectrum (AS) and power spectrum (PS) spectrum is dependent on the vehicle speed. This indicated relation with acceleration signal spectral characteristic and wheel imbalance.