相干分析法在机械设备噪声源识别中的应用

阐述了随机信号时频法、相干分析法以及利用相干分析方法鉴别噪声源的主要步骤,以一台噪声严重超标的实际车体为研究对象,首先对车体表面测得的振动与噪声信号进行时频分析,进而利用相干分析技术得出相干分析谱图,结果表明,车体此处噪声信号和振动信号具有很强的相关性,得出检测对象出现强烈噪声是由于此处车体的振动引起的,实现了对车体乘员舱处噪声源的分析识别,诊断出了车体乘员舱处噪声超标的原因,从而为车体减振降噪工作奠定了基础。这对于机械设备故障的监测与诊断有很重要的现实意义。

Coherent analysis of noise source identification in mechanical equipment

The random time-frequency method, coherent analysis and the major steps using coherent analysis to identify noise sources are described in this paper. Paper take an over noisy body of a car as the research object. At first, do time-frequency analysis to vibration and noise signals measured from the external surface of the car. Second, use coherent analysis to obtain spectra. The results showed that there were strong correlations between noise and vibration signals. It also showed that the strong detection of noise appeared here is caused by vibration of the body here. Finally, excessive noise at the passenger compartment of the body was diagnosed .The basis of noise source identification of a body of a car is theoretically introduced. This failure of mechanical equipment monitoring and diagnosis has important practical significance.