Structure-borne noise prediction and panel acoustic contribution analysis of a heavy-duty truck cab

Abstract

In order to determine which panels in cab influence the driver's ear noise greatly, a finite element model of heavy-duty truck cab was established, and its accuracy was verified by comparing the computational modal and the experimental modal. On this basis an acoustic-solid coupling model of the cab was built and the coupling effect between sound and structure was obtained by using the method of coupling modal analysis. Then the driver's ear noise was predicted based on the coupled finite element method, in which the external excitation inputs, that is, the acceleration signals of four cab suspensions, in the acoustic-solid coupling model were sampled from a real vehicle driving test. The comparison of the test value and predictive value further verifies the accuracy of the acoustic-solid coupling model. Finally, the panel contribution and the modal participation factor analysis were implemented, by which the panels that have the largest contribution to the peak pressure of the driver's ear noise were identified. The validity of the conclusions were verified by a comparison of the different driver's ear noise pressures, sampled before and after the optimization of the panels thickness.