关键词: 加速声品质；压缩机支架；模态测试；CAE 分析

Abstract: In view of the poor sound quality in the acceleration vehicle of a certain sport utility vehicle (SUV) model and the existence of sound quality problems, through noise spectrum analysis, modal test and disturbance verification, it is confirmed that the cause of the problem is caused by the excitation of the compressor assembly mode by the powertrain, and improving the compressor assembly mode is the direction to solve the problem. With the help of computer aided engineering (CAE) analysis, the optimization scheme is found, the finite element model is established, and the first mode of the original compressor assembly is analyzed to be close to the noise frequency. The compressor support is optimized by CAE to strengthen the connection with the engine body, and the first-order modal frequency of the compressor assembly is raised to 465 Hz. After the bracket of the selected scheme is replaced, the 205~250 Hz resonance band in the vehicle is significantly weakened, the Y-direction vibration of the compressor and the noise in the vehicle are significantly weakened in the 205~334 Hz range, and the noise quality in the vehicle is improved after the whole vehicle is accelerated.

Key words: Accelerate sound quality; Compressor bracket; Modality test; CAE analysis