Improving the Sound Pressure Level for a Simplified Passenger Cabin by using Modal Participation and Size Optimization
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2013, Vol 10, Issue 1
Abstract
The interior acoustics is an important part in the design stage for automakers in order to reduce the sound pressure level in the passenger compartment by using Computer Aided Engineering (CAE). The sound field in the vehicle interior is affected by the vibration of the body in white (BIW) and by the acoustic modal characteristics of the enclosed volume of air. The Finite Element Method (FEM) was used for a vibro-acoustic analysis of a simplified passenger compartment. In order to simulate the sound pressure level (SPL) at the hearing point of the driver while the firewall panel is excited, the modal frequency response analysis has been used. The SPL versus frequency curve shows that at the excitation frequency of 50 Hz the highest value of 87.09 dB(A) is recorded. The modal participation analysis is carried out to find the structural modes which contribute most to the sound pressure level inside the vehicle cab. Based on the analysis results, a size optimization was performed in order to lower the SPL at the driver’s ear location at the excitation frequency of 50 Hz applied to the firewall panel. The thickness parameters of the structural panels have been altered in order to reduce the interior noise level at the frequency of interest.
Authors and Affiliations
Adrian COROIAN, Iulian LUPEA
Keywords
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