基于机电相似理论的带附加气室空气悬架的建模与仿真分析

ue to mathematical express similarity between mechanical and electrical systems, and the theory study of electrical system is more mature and convenient than mechanical systems, by which complicated mathematical modeling and parsing of complex equation can be avoided. Based on electromechanical similarity theory, the equivalent electrical model of air suspension and its core component air spring with auxiliary chamber was built, corresponding relationship of suspension components parameters between mechanical and electrical system was obtained. The air suspension characteristics were studied both by experiment and simulation, the results match well, which verified the correctness of the electricity model. Finally, with equivalent electrical model, suspension system performance evaluation indexs were studied under different influencing factors: the volume of auxiliary chamber, speed, shock absorber damping coefficient and the sprung mass. Results show that when the auxiliary chamber volume is less than 6L, sprung mass acceleration and suspension dynamic travel change quickly with the increase of the volume, however, the variation is no longer obvious after the volume is greater than 6L. The shock absorber damping coefficient has great influence on suspension system performance evaluation indexs , as sprung mass is 965kg, the minimum of tyre dynamic load is reached when the damping coefficient is between 8250 ~ 9250Nos/m. It is necessary to take a comprehensive evaluation of suspension performance to determine the suitable shock absorber damping coefficient. Besides, the simulation analysis also proves that it's plausible to apply electromechanical similarity theory to the study of suspension system.