Jixie chuandong (Feb 2022)
NVH Simulation Research and Optimization of Electric Vehicle Reducer
Abstract
As a key component of electric drive assembly of electric vehicles，the reducer is one of the main noise sources of electric vehicles.The noise level of the reducer is directly related to electric vehicle noise，vibration， harshness （for short NVH） performance and passenger comfort.Taking a certain type of reducer as the research object，the mechanism of vibration and noise generation of the reducer is analyzed. On this basis，four simulation indicators for evaluating the NVH of the reducer are introduced: transmission error of the reducer，contact spots，dynamic stiffness of the bearing seat and modal.Based on these four indicators，simulation research and test benchmarking are carried out respectively.The results show the simulation and test results are in good agreement.Based on the above research results，the transmission error and contact spots of the two-stage gear of the reducer need to be optimized. Through strengthening of spoke structures and modification of gear teeth，the results show that the simulation transmission error and contact spots of the secondary gear can be improved and the noise of the optimized scheme test can also be reduced.
