汽车后桥噪声的分析与试验研究

本文对ＪＨＣ６４００型汽车后桥的噪声功率，表面声强，表面声压，表面振速及相应的频谱等进行了全面，系统的测量与分析，研究结果表明：后桥噪声能量主要分布在中心频率为０．８－２ｋＨｚ的频带内，它由桥体和桥盖的表面噪声构成，后桥噪声产生的根本原因是，后桥齿轮副在运转中产生的冲击与振动；噪声产生的直接原因是后桥表面的振动，所以后桥噪声的治理应在上述频带内以振动控制为主，以振动传递的路径和发声体做为主要研究对

Analysis and Investigation of Noise Caused by Automotive Rear Axle

The noise power, sound intensity, sound presure, vibration velocity and corresponding frequency spectrum of JHC6400 rear axle surface were measured and analysed. The results indicate that its sound energy mainly distributes over the frequency range of 0.8 to 2 kHz. The radical cause of the noise is the impact and vibration of gears in the rear axle housing; and the immediate cause of the noise is surface vibration of the rear axle.Therefore, it is most important to control the rear axle vibration in above mentioned frequency range for attenuating noise level. The transmitting path of the vibration and the noise source in the rear axle are considered to be main study objects.