Research on the Method of Whole Vehicle Load Spectrum Compilation Based on Road Surface irregularity

With the rapid development of the automobile industry, vehicle durability has become one of the important indicators for measuring automobile performance. As a key factor affecting vehicle durability, road surface grade has a significant impact on the load borne by the vehicle during actual driving. This study aims to explore a method for compiling a vehicle durability load spectrum based on road surface grade, in order to provide a theoretical basis and technical support for automobile durability design and testing. First, this paper reviews the classification standards of road surface grades and the characterization methods of road surface roughness, and analyzes the influence of different road surface grades on vehicle load. Secondly, through field measurement and statistical analysis, a load model under different road surface grades is established, and a time domain load signal that conforms to the actual road surface characteristics is generated using the filtered white noise method. Furthermore, combined with vehicle dynamics and load transfer mechanism, the response characteristics of the vehicle under different road surface grades are studied, and the vehicle durability load spectrum is compiled. The method of this study is characterized by comprehensively considering the statistical characteristics of road surface roughness and the dynamic response of the vehicle, ensuring the practicality and accuracy of the load spectrum. The effectiveness of the compiled load spectrum is verified by simulation analysis of the load spectrum under typical road surface grades. The research results show that the load spectrum can provide load input close to actual road conditions for vehicle durability tests, which is of great significance for improving the level of automobile durability design.