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Nowadays, the finite element method (FEM) is used to predict the performance of vehicle compartment cavity, i.e. the acoustic modal, the acoustic frequency response, etc. The accuracy of conventional FEM for acoustic problem strongly depends on the size of the mesh, element quality, etc. As element size gets greater and distortion gets severer, the deviation of high wave number problem also gets larger. In order to improve the accuracy of acoustic problem, this paper introduces a novel cell-based smoothed radial point interpolation method (CS-RPIM) to solve the vehicle compartment cavity model. In present method, the cavity is discretized using tetrahedron background cells, the each cell is further divided into four smoothing cells and then the cell-based gradient smoothing operation is implemented through the smoothing cells.

The Vehicle NVH performance is the main factor influencing the vehicle ride comfort. With regard to the NVH performance, the interior booming noise problem in run-up condition caused by powertrain vibration is the most serious NVH problem. Lots of researches have been done upon the engine theory exciting force to do the simulation analysis and optimization of the interior vibration and noise performance. In this paper, the vibration excitation of the powertrain mount is measured by testing the mule car and the interior noise are simulated by using the full vehicle Finite Element Analysis (FEA) model. Then the panel contribution analysis (PCA) is implemented on the peak frequency of the results, and the greater influential panels to the interior noise are identified, then the structural modifications and the damping layout optimizations to reduce the interior structure-borne noise are proposed by the analysis.