VEHICLE NOISE PREDICTION AND PANEL ACOUSTIC CONTRIBUTION ANALYSIS SUBJECTED TO DIFFERENT ROAD EXCITATION

The automotive interior noise subjected to different roadexcitations was predicted with finite element simulation method, andacoustic contribution from the panel was also analyzed. Firstly, B and Cgrade road spectra were generated by MATLAB. Secondly, the frequencyresponse results of body structure subjected to different road excitationswere computed at 1\sim 200\,Hz by NASTRAN. In LMS Virtual. Lab, the soundpressure level (SPL) around driver and passenger's ears was predicted byusing Acoustic Transfer Vector (ATV) technology. Also, the impact of cavitystructure surface impedance on the interior noise was discussed. Finally,the contributions of body panels to the noise levels around the driver'sright ear were achieved via panel acoustic contribution analysis (PACA), keyareas of structural optimization were identified. Analysis method discussedhere is of a good reference to noise reduction and acoustic treatment.