Analysis and identification of low frequency vortex-acoustic coupling problem caused by decompression air vent of electric vehicle
Due to the flat bottom of electric vehicle(EV),it is easy to stimulate low-frequency sound at high speed,which seriously reduces ride comfort.In this paper,a EV decompression air vent low-frequency vortex-acoustic coupling problem at high speed is taken as the research object.The mechanism of low frequency vortex-acoustic coupling problem is systematically introduced.A static test method is designed to verify the low frequency noise problem,and the key factors affecting the low frequency noise are identified.The effectiveness of the scheme is verified by the vehicle subjective evaluation and objective test.This paper has important engineering guiding significance for solving the low-frequency sound problem.
Decompression air ventCavityVortexSelf-sustained oscillationCoupling