Envelope demodulation frequency band determination method based on harmonic-to-noise ratio

摘要: Provided is an envelope demodulation frequency band determination method based on harmonic-to-noise ratio. The comprises: adhering a vibration acceleration sensor the bearing pedestal of tested antifriction or installing sound level meter position close to upper part pedestal, so as acquire signals; establishing tree filter bank perform band-pass filtering original through Hilbert transformation, obtaining signals, using logarithm spectrum estimation estimate signal ratio, and ratio value index whether fault features are significant; finally, whose maximum optimal band, analyzing determine occurrence type fault. makes full use periodicity impact caused by fault, uses measure thereby overcoming defects conventional kurtosis index. has robustness, can adaptively extract beneficial for realizing feature adaptive extraction automation diagnosis monitoring.