A theoretical and experimental investigation to vibro-acoustic characteristics of in-wheel reducer and motor drive system

Due to high power density and low production cost, the development of decentralized electric drive systems featuring integrated design and control becomes hot trend. In this paper, a comprehensive investigation is presented to vibration and noise influence assessment for an In-wheel Reducer and Motor Drive System (IWRMDS) equipped with passenger cars under typical conditions. In addition to the theoretical analysis, a test bench is built to measure resonance and vibrio-acoustic responses of the electric drive system. The dynamic modeling of multi-degrees of freedom for the integrated system is established, and numerical analysis in time and frequency domain is carried out. On the other hand, experimental effort is made on transmission test platform. Bench test results are obtained and compared with numerical predications. The resonant vibrations and acoustic time-frequency responses are identified and the optimal design solution for improving NVH performance of the in-wheel electric drive system is provided.