In the most of the automotive vehicle, there exists a gap between the roof and the trim. The gap is usually filled with air or sound absorbing materials. The vibration-sound coupled system of the actual vehicle is simply idealized as a one-dimensional model and the acoustic response characteristics of the car cavity due to the variation of the dimensions of the gap and the material properties of the fillings are analyzed. The predicted results are compared with those obtained from the finite element analysis of the three-dimensional vehicle model. The results by the simple analysis agree very well with those by the numerical analysis. The predicted results are also crosschecked with the structural-acoustic response experiments.
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