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

A technology of synchronous compression and vibration signals, applied in linear/angular velocity measurement, velocity/acceleration/shock measurement, measuring devices, etc., can solve the problems of reducing the accuracy of instantaneous speed extraction and the accuracy of instantaneous speed needs to be improved

Active Publication Date: 2015-02-25
XI AN JIAOTONG UNIV
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However, most of the current research only considers one of these two processes, and the error of any one of the tw

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

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Embodiment Construction

[0051] The method for estimating the instantaneous speed of rotating machinery based on synchronous compression transformation of vibration signals of the present invention will be described in detail below in conjunction with the accompanying drawings and a specific embodiment, and the effectiveness of the present invention in engineering applications will be verified at the same time. This embodiment is described by taking the vibration displacement signal of a rotating machine as an example, but the present invention is not limited to using the displacement signal, and other vibration signals of the rotating machine such as vibration acceleration signals can be used.

[0052] refer to figure 1 , this embodiment is carried out on a rotor test bench. A displacement sensor is used to measure the relative displacement between the rotor and the stator in the horizontal direction. The instantaneous rotational speed is compared with the instantaneous rotational speed extracted by ...

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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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Application Information

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IPC IPC(8): G01P3/00
Inventor 曹宏瑞席松涛訾艳阳陈雪峰成玮张兴武
Owner XI AN JIAOTONG UNIV
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