Variable speed gear fault signal extraction method, diagnosis method and system based on adaptive time-varying comb filtering, and storage medium

A technology of comb filtering and rotating speed signal, which is applied in the testing of mechanical components, testing of machine/structural components, instruments, etc. It can solve the problems of strong background noise, missed diagnosis, and difficulty in detecting

Active Publication Date: 2021-07-06
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of low signal-to-noise ratio or early faults, the background noise is relatively strong at this time, and the fault characteristics of gears are easily submerged and difficult to detect, thus easily causing missed diagnosis

Method used

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  • Variable speed gear fault signal extraction method, diagnosis method and system based on adaptive time-varying comb filtering, and storage medium
  • Variable speed gear fault signal extraction method, diagnosis method and system based on adaptive time-varying comb filtering, and storage medium
  • Variable speed gear fault signal extraction method, diagnosis method and system based on adaptive time-varying comb filtering, and storage medium

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Such as figure 1 As shown, the present embodiment provides a variable-speed gear fault diagnosis method based on adaptive time-varying comb filtering, including the following steps: (1) collecting gear vibration signals and speed signals at variable speeds; (2) according to the speed Signal design adaptive time-varying comb filter; (3) Adopt adaptive time-varying comb filter to perform time-varying comb filtering on the gear vibration signal to obtain time-varying comb filtering signal; (4) According to the speed signal The time-varying comb filter signal is resampled at equal angles to obtain the resampled signal in the angle domain; (5) The order spectrum is obtained by performing spectrum analysis on the resampled signal in the angle domain, and according to the modulation edge frequency order around the meshing order in the order spectrum Diagnose gear faults at variable speeds for the first time.

[0070] The test data of this embodiment comes from the single-sta...

Embodiment 2

[0116] This embodiment provides a variable speed gear fault signal extraction method based on adaptive time-varying comb filtering, including the following steps:

[0117] A collects gear vibration signal x(t) and speed signal f at variable speed r (t), t=t 1 ,t 2 ,...,t N ;

[0118] B Use an adaptive time-varying comb filter to perform time-varying comb filtering on the gear vibration signal to obtain a time-varying comb filtering signal. The time-varying comb filtering signal is the purified gear mesh vibration component and its modulation edge frequency components.

[0119] For the structure of the adaptive time-varying comb filter and the process of using the adaptive time-varying comb filter to perform time-varying comb filtering on the gear vibration signal, please refer to the description of Embodiment 1. Let me repeat.

Embodiment 3

[0121] Such as figure 2 As shown, this embodiment provides a system based on the above-mentioned variable-speed gear fault diagnosis method based on adaptive time-varying comb filtering, including:

[0122] The signal acquisition unit is used to synchronously acquire gear vibration signals and rotational speed signals at variable rotational speeds;

[0123] A time-varying comb filter design unit is used to design a time-varying comb filter according to the collected rotational speed signal.

[0124] A time-varying comb filter unit, configured to perform time-varying filtering on the collected gear vibration signals according to the time-varying comb filter to obtain a time-varying comb filtering signal;

[0125] The signal resampling unit is used to perform equiangular resampling on the time-varying comb filter signal according to the collected rotational speed signal, so as to obtain equiangular resampled signals.

[0126] The spectrum analysis unit is used for performing ...

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Abstract

The invention discloses a variable speed gear fault signal extraction method, diagnosis method and system based on adaptive time-varying comb filtering, and a storage medium. The diagnosis method comprises the following steps of acquiring a gear vibration signal and a rotating speed signal under a variable rotating speed, performing time-varying comb filtering on the gear vibration signal by using an adaptive time-varying comb filter to obtain a time-varying comb filtering signal, performing equal-angle resampling on the time-varying comb filtering signal according to the rotating speed signal to obtain an angular domain resampling signal, and performing spectral analysis on the angular domain resampling signal to obtain an order spectrum, and diagnosing the gear fault under the variable rotation speed according to the modulation side frequency order around the meshing order in the order spectrum. According to the method, the gear meshing vibration frequency component and the modulation side frequency component containing the gear fault information under the variable rotating speed are accurately extracted, meanwhile, interference of other signal components is removed, and the gear fault characteristics under the variable rotating speed can be effectively highlighted.

Description

technical field [0001] The invention belongs to the field of state monitoring and fault diagnosis of mechanical equipment, in particular to a gear fault signal extraction method under variable speed and its fault diagnosis method and system, more specifically to a variable speed based on adaptive time-varying comb filter Gear fault signal extraction method, diagnosis method, system and storage medium. Background technique [0002] Gears are a widely used component in rotating machinery, often used to transmit torque, change speed, change direction, etc. In practical applications, due to the high working intensity, complex operating environment, and continuous operation under heavy loads, gears are prone to local failures such as spalling, cracks, and broken teeth due to fatigue wear, which affects the safe operation of the entire equipment. Therefore, monitoring and fault diagnosis of gears is of great significance to ensure the reliable operation of the whole equipment. ...

Claims

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Application Information

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IPC IPC(8): G01M13/045
CPCG01M13/045Y02E10/72
Inventor 陈向民段萌舒国强张亢卢绪祥晋风华李录平
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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