NVH Analysis and Optimization of Light Truck Electric Drive Axles Based on Romax

A light truck 3.5 t parallel shaft electric drive axle was taken as the research object, and the NVH test was carried out to it. In order to find out the main cause of howling and carry out optimization lifting, the method of combining experiment with simulation was adopted. Based on the test results, it is found that the main reason of the howling is the meshing excitation of the first gear of the electric drive axle, and then the rigid-flexible coupling multi-body dynamic simulation model of the electric drive axle was established based on the Romax Designer software. Through the calculation of transmission error and load distribution on the gear surface of the reducer, the vibration response of the shell was obtained. In order to reduce the fluctuation of transmission error of the gear, the micro modification of the reducer gear was carried out by using genetic algorithm, thus the excitation of the electric drive axle caused by the gear meshing was reduced, and the NVH performance of the electric drive axle was further improved. The aim is to provide reference for technical research in this field.