Abstract
Panel acoustic contribution analysis (PACA) is an advanced engineering tool to improve noise, vibration, and harshness quality and minimize weight of vehicles. It is a technique to categorize areas of ve- hicle body panels as positive (sound level increases as vibration ampli- tude increases), negative or neutral according to their contribution to the total sound. PACA is a hybrid of computer aided engineering and experi- mental methods. Computer aided holometry (CAH), scanning laser ve- locimetry (SLV), or an accelerometer net is used to experimentally mea- sure structure vibration complex velocities. These velocities are the boundary conditions for a boundary element model of the acoustic cav- ity. Boundary element analysis is then used to predict the vehicle interior sound and calculate panel acoustic contributions. Experimental results for a welded steel box (validation) and vehicle application are presented.
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