A method for quickly obtaining an optimal frequency response function based on hammering

Abstract

The present application relates to a kind of method for quickly obtaining optimal frequency response function based on hammering method, belong to tire test field.The time domain data of excitation signal and acceleration response signal are segmented;Window function is applied to each segment signal, wherein force window is applied to excitation signal, and exponential decay window is applied to acceleration response signal;Discrete fourier transform is carried out to each segment signal after windowing;The cross power spectrum of the excitation signal and acceleration response signal and the self power spectrum of each are calculated, which is the basis for calculating H1 estimation and H2 estimation of frequency response function and coherence function;According to the coherence function as quantitative index, the first knock signal is selected;Based on the found first knock signal, according to the coherence function as quantitative index, the remaining two knock signals are found;According to the three knock signals found, the final frequency response function is determined. After keeping the same force to continuously knock the specified position of tire multiple times, the optimal frequency response function can be obtained using all knock data.

Images