谐波小波包方法及其对转子亚频轴心轨迹的提取

HARMONIC WAVELET PACKETES METHOD AND USED ON ACCURATE OBTAINING THE ORBIT OF ROTOR SUB-FREQUENCY SIGNAL

转子轴心轨迹,特别是亚频轴心轨迹的提取,在转子故障识别中是十分重要的。分析了谐波小波的优势,在研究了谐波小波的频段分解基础上,提出了谐波小波包变换的频段分析表达式,并给出了实现方法,实现了谐波小波的任意频段“任意细化”能力。对转子振动信号进行了频域细化分析,并用谐波小波包变换对实际的高速转子振动信号进行了分析,在得到细化频谱的同时,直接实现了常规方法难以实现的转子亚频信号的轴心轨迹提取,得到了满意结果,为转子故障信号的分析创造了条件。

The advantage of harmonic wavelet is analyzed. On the basis of research for part decomposition in frequency domain, the expression for harmonic wavelet packets transform on frequency section is put forward. The realizing method of harmonic wavelet packets transform is given out. The ability of harmonic wavelet analysis on arbitrary detail of frequency section is realized. The vibration signal of rotor is analyzed in detail frequency section. The real vibration of high speed rotor is analyzed by harmonic wavelet packets transform. At the same time of obtaining detail spectrum, the orbit of rotor's sub-frequency signal is accurate obtaining directly. This is difficult in general method. The satisfied results are received. This provides the new method for signal analysis of rotor fault.