基于零相位转频跟踪带通滤波的旋转机械Bode图

Rotating Machinery Bode Diagram Based on Zero-Phase Rotating Frequency Tracking Band-Pass Filter

针对现有方法难以获得旋转机械Bode图相位信息的问题,提出了基于零相位转频跟踪带通滤波的旋转机械Bode图实现方法。其原理是对采集的原始振动信号进行分段零相位转频跟踪带通滤波,滤波器的中心频率为每段时间内转子的平均转频,滤波后得到具有精确相位信息的1阶振动信号。通过1阶振动信号的时域波形提取出转子振动的幅值和相位,实现旋转机械Bode图。实测试验验证了该方法的有效性,结果表明本方法在极低的采样频率下,就能得到较高的精度,具有很好的工程实用价值。

Rotating machinery bode diagram based on zero-phase rotating frequency tracking band-pass filter is proposed to overcome the deficiency of existing methods in obtaining accurate phase.The raw vibration signal is filtered by using zero-phase rotating frequency tracking band-pass filter that get the one-order vibration signal possessed accurate phase information.Among which,the center frequency of the filter is the average rotating frequency within each period.The amplitude and phase information is got from time domain waveform of one-order vibration signal and these information is used to plot the bode diagram.The experiment verifies the effectiveness of this proposed method,and the result shows that this proposed method can get high accuracy under very low sampling frequency.This method is of high engineering application values.