Research on Coupling of Porous Material with Acoustic Cavity and Sheet Metal,and Calibration of the Modeling Method
To overcome the challenges of NTF simulation accuracy in vehicle NVH simulations,the paper designed and constructed a"rigid-wall occupant cabin",which reduced the coupling effect between the"acoustic cavity mode"and the"container"to a negligible extent.Based on the rigid-wall passenger cabin,the influence of sub-acoustic cavities on the overall acoustic cavity mode was analyzed,and the modeling method for porous materials was discussed.The porous material models such as seats and carpets were established,and the effect of front wall sound insulation material on the coupling of sheet metal vibration and acoustic cavity mode was analyzed quantitatively.The simulation and test results show that the cavity mode,air-borne sound transfer function,structural vibration transfer function and sound transfer function all achieve good simulation accuracy.The findings of this paper provide a reference for the control of low frequency road noise and engine noise.
cavity modeporous materialair born noisestructure born noisefinite element modelingorrelation between test and simulation
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