Analysis And Application Research Of A Certain Passenger Car Acoustic Package Based On SEA Modeling

This article takes a domestic brand SUV car as the research object,uses the automobile high-frequency noise analysis method-Statistical Energy Analysis(Statistical Energy Analysis,SEA)to analyze the sound pressure level,carries on the high-frequency modeling to the sample car,and determines the interior of the car.The noise contribution of each component to the driver and rear passengers,the acoustic package optimization of the components with a larger contribution,and the cost reduction scheme design for the components with a smaller contribution,will finally reduce the weight of the vehicle acoustic package by 5kg.The sound pressure level of noise near the ears of the occupants and rear passengers is reduced by 2.3d B.The specific research work is as follows:1.Analyzed the principle,application scope and assumptions of the statistical energy analysis method;established a high-frequency noise simulation model in strict accordance with the provisions of the statistical energy analysis method.Based on the SEA application scope and assumptions Energy flow is formed between the systems;materials such as sheet metal parts of the entire car are added to make the properties such as density consistent with the original car;the acoustic package material of the car is added,which is also consistent with the original car.2.The three key parameters of the statistical energy analysis model are obtained through various methods-modal density,internal loss factor and coupling loss factor;the original material properties of the prototype and the original acoustic package are added to the simulation model for calculation Sound pressure level and subsequent optimization.3.Carry out the sound load test of the whole vehicle in a semi-anechoic chamber,and obtain the sound pressure level of the driver’s head in the car and the head of the rear passenger at the speed of 100km/h and 120km/h;the acoustic excitation data of the position outside the car;The external measurement point data is imported into the simulation model as an excitation,and the semi-anechoic room environment state is simulated in the ESI.VAOne software.The simulation obtains the sound pressure level of the driver’s head in the car and the head of the rear passenger at the speed of 100km/h and 120km/h.Data;compare the data obtained from simulation and experiment to verify the accuracy of the model,which can be used as a model for the optimization of the acoustic package later.4.The simulation obtains the energy flow to the driver’s voice cavity and the rear passenger’s voice cavity under the 120km/h vehicle speed.Through the analysis,the subsystem ranking of the contribution to the driver’s voice cavity and the rear passenger’s voice cavity is obtained;,The floor and ceiling have been designed to optimize the acoustic package,and the cost-reducing scheme of the sub-systems such as the middle aisle,door panel and rear wheel cover with a small contribution has been designed;finally,the highfrequency noise of the whole vehicle has been significantly reduced,120km/ Under h working condition,the sound pressure level of the whole vehicle is reduced by 3d B,and the goal of light weight of the vehicle is reached at the same time,and the weight of the whole vehicle acoustic package is reduced by 21.06%.