Acoustic Modelling and Analysis of Vehicle Interior Noise Based on Numerical Calculation

In this paper, various numerical calculation methods are rigorously combined to model and analyze the acoustic characteristics of a heavy truck cab. Firstly a brief introduction of different numerical calculation methods is given, then the finite element structure model and cavity model of the cab are built. The statistical energy analysis models of the cab, including structural subsystems and cavity subsystems, are also built and used in the high-frequency range. The panel acoustic contribution analysis and the energy transfer path contribution analysis are carried out to find the panels which contribute most to the sound pressure inside the cab. Based on the analysis results, structure modification of these panels has been proposed with acoustics topology optimized. The optimization result shows that the sound pressure level on the side of the driver´s right ear can be reduced by a few decibels. Necessary tests to validate the models are also administered.