Abstract: In the rotor dynamic balance system, the extraction of fundamental frequency amplitude and phase of vibration signal plays an important role in calculating the accuracy of rotor imbalance. In view of the large error in the calculated rotor unbalance caused by the traditional method of extracting the amplitude and phase of vibration signal, a peak difference method is proposed to extract the amplitude and phase of rotor vibration signal. The peak difference method, correlation method and fast fourier transform (FFT) method are written into LabView rotor dynamic balance vibration signal amplitude and phase extraction program respectively. The rotor dynamic balance experiment is carried out, and the rotor unbalance calculated by the three methods is analyzed and compared. The experimental results show that compared with the correlation method and FFT method, using the peak difference method as the program to extract the amplitude and phase of the fundamental frequency of the vibration signal in the rotor dynamic balance system, the calculated rotor unbalance error is smaller and more accurate.

Key words: Vibration signal extraction; Peak difference method; Correlation method; Fast fourier transform (FFT) method; LabView; Dynamic balance accuracy

摘要： 在转子动平衡系统中，振动信号基频幅值和相位的提取对计算转子不平衡量的精准度 起着至关重要的作用。针对传统方法提取振动信号幅值相位导致计算的转子不平衡量出现较 大误差的问题，提出了一种峰值差法对转子振动信号幅值相位进行提取。将峰值差法、相关 性法、快速傅里叶变换（FFT）法分别编写成 LabView 转子动平衡振动信号幅值相位提取程 序，进行转子动平衡实验，对三种方法计算出的转子不平衡量进行分析对比。实验结果表明： 与相关性法和 FFT 法相比，采用峰值差法作为转子动平衡系统提取振动信号基频幅值相位的 程序，计算出的转子不平衡量误差更小，更加精准。

关键词: 振动信号提取；峰值差法；相关性法；快速傅里叶变换（FFT）法；LabView；动平 衡精度