Analysis And Optimization Of Automobile Low-frequency Noise Based On Transfer Path Analysis

With the continuous improvement of car performance requirements by ordinary people,the importance of car comfort in corporate vehicle research and development continues to increase.Automotive NVH(Noise,Vibration,Harshness)performance is an important performance indicator in the forward development of automobiles.According to the city’s road driving conditions,vehicles generally run at low and medium speeds,and the excitation from the road surface is transmitted to the body through the suspension system,and the vibration response of the interior noise caused by the vehicle becomes an important consideration in automobile development.Therefore,the analysis and optimization of low-frequency road noise have important practical significance in vehicle development.Based on the transfer path analysis method,this paper analyzes the noise response in the vehicle caused by the road surface excitation through a combination of experimental testing and finite element simulation.First,the transmission path data is obtained through the TPA test.Because the road surface excitation is a partial coherent function,it is necessary to use the principal component analysis method to decouple the input of the uncorrelated single excitation path,and then use the inverse matrix method to analyze the transmission path of the decorative car body to obtain Load spectrum at the installation point.The finite element simulation is used to establish the decorative body model,and the load spectrum is loaded on the decorative body to calculate and predict the vehicle interior response and compare with the test results.Through TPA simulation analysis,find the path of the problem that caused the peak response in the vehicle.Simulate the suspension system under the installation point dynamic stiffness and working state.Due to the particularity of the problem frequency,the tire is simulated and analyzed to confirm the peak response in the vehicle.Reason,and put forward the improvement plan,and finally prove that the plan is effective through experiments.The finite element simulation technology is added to the development of vehicle road noise to point out the direction for engineers to solve the road noise problem.Effective noise reduction programs can be implemented in the vehicle design stage to avoid the high cost or failure of subsequent adjustment programs.To reduce the risk of excessive road noise,shorten the development cycle,and reduce the development cost,the technical research inthis article provides a complete technical development route for the development of road noise.