基于相位差校正技术的动平衡信号高精度测量

High Accuracy Parameters Measurement of Dynamic Balancing Signal Based on Phase Difference Correction Technology

提出利用相位差校正技术实现动平衡信号的高精度测量。对原始随机采样的振动信号序列时移构造相同点数的新序列，分别对这两个信号序列加对称窗函数进行FFT分析，利用各自离散频谱中对应峰值谱线的相位差求取信号幅值和相位的校正量，最后根据该校正量得到基频不平衡信号的特征参数，同时也说明了对称窗函数的选取原则。该方法的采样频率不受待测信号频率影响，不需要整周期采样，算法实现方便，实时性好，且加适当的窗函数可以消除信号中的谐波、噪声干扰。实验结果表明该方法能够实现动平衡信号参数的高精度测量。

The phase difference correction technology is presented to measure the parameters of dynamic balancing signal with high accuracy. A new signal sequence is constructed by shifting the original random sampling signal sequence in time domain. The FIT spectrum analyses on the original sequence and the new one are made with symmetrical window functions separately, and then the corrections of the amplitude and phase are obtained by the phase difference of the peak lines in each discrete spectrum. Finally, the characteristic parameters of the first harmonic dynamic balancing signal are obtained by those corrections. The principles of the selecting windows function with high anti-noise efficiency are expounded. The frequency of the measured signal has no influence on the sampling frequency when adopting this method and the measured signal needs not to be picked up by integral period sampling. The experimental results validate the effectiveness of the presented method for parameters measurement of dynamic balancing signal.