This paper describes about the practical finite element (FE) modeling of vehicle structure and acoustics, in order to predict "boom" response to powertrain excitation. The FE modeling process through validation and updating with experimental mode makes, the accumulation of considerable expertise for improving prediction accuracy, possible. FE analysis based on this modeling process is so useful for predicting "boom" level up to 200Hz. Using the result of FE analysis, structural optimization with Response Surface Method is executed in order to improve "boom" level of 80Hz.
