NVH performance optimization of trimmed body based on noise transfer function

With the rapid development of automobile technology, how to improve the performance of noise, vibration and harshness (NVH) has always been the focus of automotive research and development. In this paper, the installation point of a car air conditioning is used as the excitation source, and the right ear of the driver and rear passenger is used as the response point for NVH researching. The acoustic-solid coupling finite element model of the vehicle is established by using the 3D body model of the vehicle and the finite element model equipped with the passenger compartment. Through the noise transfer function analysis, combined with the modal analysis of the prepared body and the analysis of working deformation, the body components with relatively large contribution to noise transfer are identified and optimized. The optimization results show that the sound pressure value at the driver is reduced by 12.7dB, and the peak sound pressure at the rear passenger is also significantly decreased. Thus, the NVH performance is improved. The analysis method and optimization scheme adopted in this paper are simple and feasible, which has certain reference value for the personnel and manufacturers engaged in automobile design.