Analysis and Optimization of Interior Noise Based on Transfer Path Analysis

The identification and solution to noise and vibration problems are important ways to continuously improve the comfort in the mechanical field. The car is a more complex mechanical system, and the transfer path of noise and vibration into the car is very complex. It is difficult to identify the path problem by conventional noise and vibration test and analysis measures. Using the transfer path analysis method, the key transfer path of noise and vibration can be identified more quickly. Aiming at the problem of 340-440 Hz and 460-560 Hz acceleration roughness noise in a newly developed car, the OTPA model is built, and the main contribution paths of the problematic frequency band of the car are the right suspension active side tie rod and the right suspension passive side bracket. The scheme of adding vibration absorber is verified, and the acceleration roughness amplitude in this frequency band is reduced by about 3-5 dB (A). The NVH problem can also be solved by increasing the dynamic stiffness of the active side mount bracket with CAE. It is proved that by further improving the dynamic stiffness of the active end mount bracket, the resonance amplitude of the passive end can be reduced, which provides a new idea for similar problems.