Adaptive STFT based rotary machine order tracking method
A rotating machinery and order tracking technology, which is applied in the field of STFT order tracking, can solve the problems of time-frequency domain aliasing and the limitation of time-frequency resolution that cannot be changed, and achieve the effect of avoiding aliasing and overcoming the fixed window length
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[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific application examples.
[0030] The principle of the rotating machinery order tracking method based on adaptive STFT is as follows: figure 1 As shown, the scale function of the window function is determined according to the principle that the greater the rotation speed, the greater the length of the window function, the scale function is substituted into the adaptive STFT, the adaptive STFT is performed on the original vibration signal, and the order is extracted from the transformed time spectrum. The time domain curve of the order component is obtained by inverse transformation of the order component, and the order tracking is realized. The specific steps of the method are as follows:
[0031] 1. Use an eddy current sensor to collect the radial vibration signal of the rotating shaft, denoted as x(n).
[0032] 2. According to the increase or decrease of the ...
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