Diagnosis analysis and control method of booming noise in car's passenger
In this paper,diagnosis,analysis and control of the roar of a passenger car under acceleration conditions are carried out.First of all,the problem conditions are determined through subjective evaluation,and through the real vehicle test,it is found that there is obvious roaring noise in the car around 2400 r/min.Using order analysis,modal analysis and frequency-staggered verification,it can be seen that the engine excitation is transmitted to the sub-frame through the suspension,causing the resonance of the sub-frame,which is then transmitted to the interior of the vehicle to cause a roaring sound.Finally,the subframe rubber bushing structure is optimized by transfer analysis and flexible connection point admittance method.The results show that after optimization,the difference between the overall level at 2400 r/min and the second-order sound pressure is 7.5 dB(A);The overall level and the second order noise sound pressure increase,and the roaring sound decreases significantly.The subjective evaluation is acceptable.
NETL
NSTL
万方数据
维普
