Enhanced phase waterfall plot-based rotor crack weak fraction harmonic feature identification method
A technology of rotor cracks and fractional harmonics, which is applied in analyzing materials, processing detection response signals, and using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., to achieve accurate identification and eliminate random phase values.
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[0035] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0036] The present invention obtains a series of short-time signals by moving short-time sampling of the original signal, that is, the signal to be analyzed, uses FFT to obtain its frequency-domain phase spectrum, and adopts a linear element morphological filtering method to realize phase spectrum feature enhancement; the enhanced phase spectrum is divided into The sampling time series are arranged sequentially into a phase waterfall diagram, which realizes the separation of the random phase area caused by FFT calculation and noise from the regular phase band of the real frequency component, so as to realize the identification of weak frequency components. This method is a brand-new frequency component identification method, which is simple and feasible, and can provide effective support for w...
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