Research On Control And Prediction Of Vehicle Inner Noise

With the critical requirement of vehicle riding comfort especially inner acousticenvironment, Automobile enterprises pay more attention on car inner noise. How toimprove vehicle inner acoustic environment has become the focus of eachmanufactures. Basing on a SUV car, the Finite Element Method (FEM) was applied toestablish the body-cavity coupling model in order to predict the inner noise. Throughpressure sensitivity analysis method, the optimization model was established based onresponse surface method (RSM). The body panels’ thickness and damping materiallayout was optimized to reduce the car inner noise. The main research contents are asfollows:①Using the finite element method to establish car body, cavity and body-cavitycoupled models. Analyzing the car body, cavity and body-cavity coupled modals. Thedriver’s right ear pressure response at the exciting of mountings was calculated. Theabove results lay the foundation of car inner noise control and body structureoptimization.②The white body FEM model was established. Car body torsion stiffness andbending stiffness was calculated according to the requirement of body stiffness test.Analyzing the stiffness distribution and comparing it with foreign similar bodystiffness provide the basis for the car body structure optimization.③The panels’ thickness sensitivities were calculated by using the sensitivityanalysis method. Set the minimization of inner noise pressure as objective, theoptimization model was established basing on polynomial response surface methodand was solved by using the penalty function method. The precision of agency modelwas also inspected. The results showed that: the vehicle inner noise was effectivelyimproved and the maximum sound pressure drop was12.98dB.④Establishing the damping material layout topology optimization model in thebasis of panel thickness optimization, the evolutionary structure optimization code wasapplied to obtain the optimal layout of damping material. The results showed that: thereduction of inner noise was5.79dB after using the optimal layout of dampingmaterial.