Analysis Of Vibration And Noise In An SUV Based On Transfer Path Analysis

The upgrade of the automobile consumer market and the explosion of young consumers' consumption power make the automobile consumers increasingly younger.Young consumers have stricter requirements on the level of noise and vibration in the car.This article takes an SUV as an object to study the main transmission path of noise and vibration in the vehicle under the excitation of its powertrain.Aiming at the powertrain excitation,the transmission path analysis model of the powertrain mounting system,exhaust suspension,etc.to the vehicle body is established.After completing transfer function measurement,working condition data measurement,and working load calculation,it can be known from the test that the acceleration condition 2400r/min and 3500r/min corresponding frequency is the problem frequency,and the left and right suspension paths are the problem path.The body-in-white model was established using finite element software,its free mode was calculated and compared with the experimental mode.The comparison results show that the error between simulation and experiment is small,and the established model is effective.After performing frequency response analysis on the right and rear suspension paths,use the work deformation analysis method to perform secondary transfer path analysis to determine the left side of the front floor,the middle floor and the inner panel of the front door as the positions to be optimized.According to the principle of damping noise reduction,the simulation of noise reduction is predicted at three locations,and the noise reduction effect is verified through experiments.The results show that the acceleration peak 3500r/min noise peak value drops by 3.8dB,the noise reduction scheme is effective.