Noise Analysis of an Lightweight Auto-body Using FEM/BEM

Since numeric simulation can save much costs, it is widely used in automobile design. Besides, noise, vibration and harshness(NVH) performance is one major target for engineer to design a competitive product. In this paper, NVH performance of a lightweight auto-body prototype using alternative materials and gauge thickness were studied by finite element method (FEM) and boundary element method (BEM). In order to find the most contributing panel to the peak value of response, the panel acoustic contribution analysis (PACA) was performed and the most effective modification area was located. Finally, the sound pressure was reduced by putting damping material on these parts.