论文部分内容阅读
3.小波包频带能量监测 小波包技术将信号无冗余、无疏漏、正交地分解到独立的频带内,所以这些频带里信号的能量是守恒的,且每个频带里信号的能量对于状态监测和故障诊断都是十分有用的信息。目前,国内外大都采用FFT频谱分析选取某些特征频率的幅值来进行监测诊断。这种方法相当于只考虑正弦振动的能量,而没有考虑其它振动的能量。频带能量监测应当计及各频带里信号的全部能量,包括非平稳、非线性振动能量,如摩擦、松
3. Wavelet packet band energy monitoring Wavelet packet technology to signal redundancy, non-negligible, orthogonal decomposition into independent bands, so the signal energy in these bands is conserved, and the signal energy in each band for the state Monitoring and troubleshooting are all very useful information. At present, most of the domestic and foreign countries use FFT spectral analysis to select the amplitude of some characteristic frequencies for monitoring and diagnosis. This method is equivalent to considering only the energy of sinusoidal vibration, without considering the energy of other vibrations. Band energy monitoring should take into account the full energy of the signal in each frequency band, including non-stationary, nonlinear vibrational energy, such as friction, loose