Investigating the acoustic properties of vehicle compartments

摘要

Vehicle interior noise has been an important problem for the car industry for at least the past four decades (1). With many noise generation mechanisms, including structural and airborne sources, it is a very complex subject that employs a variety of modelling techniques. These include experimental techniques using excitation of sound inside cavities by means of a loudspeaker (2) or an electromagnetic shaker (3, 4). Finite Element Analysis and Trefftz-based methods are being used widely to predict acoustic responses of both regular and irregular cavities (5, 6). In spite of noticeable progress, there is still insufficient understanding of the acoustic resonant properties of a vehicle interior which are paramount in defining levels and frequency contents of vehicle interior noise.