Rotary machine instantaneous rotation speed estimation method based on vibration signal synchronous compression transformation

Abstract

The invention discloses a rotary machine instantaneous rotation speed estimation method based on vibration signal synchronous compression transformation. The rotary machine instantaneous rotation speed estimation method comprises the following steps of 1 obtaining a vibration signal in the rotary machine operation process; 2 conducting frequency shift treatment on the measured vibration signal, 3 conducting synchronous compression continuous wavelet transformation on the vibration signal subjected to the frequency shift treatment to obtain the time-frequency distribution of the vibration signal subjected to the frequency shift treatment, 4 utilizing a Viterbi algorithm to extract first-order instantaneous frequency components of the vibration signal subjected to the frequency shift treatment from the obtain time-frequency distribution, and 5 utilizing the extracted first-order instantaneous frequency to recover calculation so as to obtain the rotary machine instantaneous rotation speed. The rotary machine instantaneous rotation speed estimation method adopts a frequency shift algorithm and the synchronous compression continuous wavelet transformation to process the signal, achieves accurate estimation of the instantaneous frequency of the vibration signal, utilizes the Viterbi algorithm to achieve accurate extraction of the instantaneous frequency and can accurately extract the instantaneous rotation speed of a rotary machine which cannot directly measure the instantaneous rotation speed through the vibration signal.

Description

technical field [0001] The invention relates to a method for estimating the instantaneous rotational speed of a rotary machine. Background technique [0002] The instantaneous speed of rotating machinery often contains a large amount of information about its own operating status, and this information is of great significance for real-time control, status detection and fault diagnosis of equipment. How to accurately extract the instantaneous speed of rotating machinery has become a research hotspot in recent years. [0003] The direct measurement method of the instantaneous speed of the rotating machine is to use a rotary encoder, and use a specific signal processing method to process the pulse signal generated by the encoder, so as to obtain the instantaneous speed of the rotating machine. However, due to reasons such as unacceptable operating conditions, unreasonable design and assembly, and cost, direct measurement of the instantaneous speed of rotating equipment cannot b...

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Problems solved by technology

However, most of the current research only considers one of these two processes, and the error of any one of the two will reduce the accuracy of instantaneous speed extraction. The instantaneous speed accuracy needs to be improved

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