The rigid body modal test and mounting stiffness check of new energy bus motor mounting system

Motor mounting system research mainly uses traditional mounting system methods, and the main research direction is the optimization method of mounting decoupling ratio. In this paper it is mainly established that the mounting system kinetic model which be used to reverse mounting dynamic stiffness of Z direction and identify the mode shape according to the test results. At the same time, rubber mounting static stiffness can be simulated by finite element analysis, and then the dynamic to static ratio can be obtained according to Z direction modal frequency. Finally, every modal frequency can be calculated using matlab based on matric A, which is compared with the measurement results.Due to the effect of the Y direction of the waist hole, it is found that X, Y direction mounting stiffness is not equal, the actual stiffness of the Y direction $\lt $ design stiffness. Using the check method can investigate the interference of the mounting system results, there is a great help of exclude other factors when the mounting system is optimized.