关键词: NVH 问题；宏观参数优化设计；MASTA 仿真分析；微观修形优化设计

Abstract: After the three-in-one electric drive assembly is equipped with a pure electric sport utility vehicle (SUV) on the market, the vehicle will emit a similar whistling sound when driving under working conditions of 1 500 to 10 000 r/min. After the noise, vibration, harshness (NVH) test analysis of the abnormal sound vehicle, according to the NVH test analysis results, the NVH optimization measures are proposed. The macro and micro parameters of the gear are optimized, and then combined with the software simulation micro contour to reduce the transmission error, improve the contact spotting of the gear tooth surface. By trial production of parts, testing and verification of packing test bench, subjective evaluation of the whole vehicle on loading, and NVH test and analysis, finally some constructive suggestions are given to solve the optimization of the electric drive three-in-one NVH, and some practical optimization measures are given to solve the typical NVH problems such as the loud noise of the gear of pure electric vehicles.

Key words: NVH problem; Macro parameter optimization design; MASTA simulation analysis; Micro contour optimization design