数字锁相环引起的振动信号幅值和相位误差分析

ANALYSIS OF AMPLITUDE AND PHASE ERROR IN VIBRATION SIGNALS TEST CAUSED BY DIGITAL PHASE-LOCKED LOOP

在旋转机械设备振动信号测试中，由于数字锁相环不能准确对周期信号进行整周期采样会引起的幅值和相位误差，本文分析了这种误差产生的原因，并给出了减小误差的方法．

In vibration signals test of rotating-machine, the actual sampling rate which is controled by digital Phase-Locked Loop is not exact equal to that in theory, so the amplitude and phase error occur. In this paper, the reason is analyzed and the method for reducing error is given.