Research on digitized modeling method of riding road of vehicle

Digitized modeling method of riding road of vehicle is researched for improving the accuracy of vehicle virtual test results. Dual-track real profilometer is used to measure the periodic medium wave and long wave roads. The credibility and veracity of measuring method are verified by comparing actual measuring data with wave curves which are built based on the design parameters of road outline. Then two kinds of random roads, i.e., residue road and gravel road, are measured by using a dual-track real profilometer, and the actual road roughness data is obtained. Power spectral density (PSD) of actual measuring data is estimated by Welch algorithm based on modified periodogram method, and the rank of measuring random road is assessed according to GB/T 7031-2005 national standard. The 3D random road models are built by means of harmony superposition method, of which PSD is consistent with actually measured data, and its credibility is verified consequently.