交流接触器振动噪声测量方法及系统开发

Vibration and Noise Measurement Method of AC Contactor and System Development

为了实现强背景噪声环境下交流接触器的噪声测量,开发基于振速法的噪声测量系统.首先,在消声室内,通过激光测振仪和传声器分别采集大量相同型号的交流接触器的振动信号和声压信号,计算并提取辐射指数.然后,测量一定数量相同型号的交流接触器运行时的表面振动,通过振速法,求得其噪声值.最后,将求得的噪声值与声级计的测量值进行对比.结果表明:当交流接触器的噪声为30~50dB时,两种方法的测量误差为±1dB;该测量系统能够通过振动强弱求得噪声值,并准确判定合格与否,不受背景噪声的影响.

In order to realize the noise measurement of AC contactor under strong background noise,a noise measurement system based on vibration velocity method was developed.First,the vibration signals and sound pressure signals of a large number of AC contactors with the same type were collected respectively by laser vibrometer and microphone in the anechoic chamber,and the radiation index was calculated and extracted.Then,the surface vibration of a certain number of AC contactors with the same type was measured,and the noise value was obtained by using the vibration velocity method.Finally,the obtained noise was compared with the measured value of sound level meter.The experimental results showed that when the noise of the AC contactor was between 30 and 50 dB,the measurement error of the two methods was within ±1 dB.The system can obtain the noise value through vibration strength,and accurately determine whether the AC contactor was qualified or not,which not affected by background noise.