Exploring Harmonic Wavelet Adaptive Filtering Method
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摘要: 为适应电主轴高精度动平衡测试的要求,根据谐波小波的相位锁定、窄带分析功能以及在时域具有明确的表达式的特点,研究了谐波小波自适应滤波的方法并给出了算法。该方法由转动频率和滤波带宽确定出相应频段的谐波小波,通过谐波小波与振动信号在时域的相关运算,提取与转速同频的动不平衡信号。为验证谐波小波的滤波性能进行了仿真和电主轴动平衡实验研究,结果表明:通过谐波小波自适应滤波,能够精确提取动不平衡信号;该滤波方法简单、实时性好,可满足高精度电主轴动平衡测试的要求,具有较强的应用价值。Abstract: Following the locking of harmonic wavelet phase, naxTow-band analysis and the clear expression of time domain, we study the harmonic wavelet adaptive filtering method and give its algorithm. We determine the harmon-ic wavelet from the rotational frequency and filtering bandwidth and extract the dynamic imblance signal that has the same frequency as the rotational speed by calculating the harmonic wavelet and vibration signal in time domain. verify the filtering performance of the harmonic wavelet, we carry out the simulation and on-site spindle dynamic balancing test; the simulation and test results show that: ( 1 ) our harmonic wavelet adaptive fihering method can accurately extract the dynamic imbalance signal; (2) our filtering method is simple and has real time, thus being able to satisfy the requirements for high-precision dynamic balancing test.
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