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Rotor rub impact fault detection method based on nonlinear compression conversion and rotor rub impact fault detection system based on nonlinear compression conversion

A non-linear compression and fault detection technology, applied in vibration measurement in solids, machine/structural component testing, vibration measurement, etc., can solve problems such as difficult to locate rotor system rubbing faults

Active Publication Date: 2015-05-20
XI AN JIAOTONG UNIV
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Problems solved by technology

When a certain feature is found, it is difficult to locate the friction fault of the rotor system

Method used

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  • Rotor rub impact fault detection method based on nonlinear compression conversion and rotor rub impact fault detection system based on nonlinear compression conversion
  • Rotor rub impact fault detection method based on nonlinear compression conversion and rotor rub impact fault detection system based on nonlinear compression conversion
  • Rotor rub impact fault detection method based on nonlinear compression conversion and rotor rub impact fault detection system based on nonlinear compression conversion

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Embodiment Construction

[0035] In a basic embodiment, a rotor rubbing fault detection method based on nonlinear compressive transformation is provided. The method obtains the time-frequency representation of the vibration signal by performing nonlinear compressive transformation on the vibration signal of the rotor system, and combines the The time-frequency representation calculates the instantaneous frequency of the vibration signal, and then further calculates the frequency spectrum of the oscillation part of the instantaneous frequency; assuming f r is the rotation frequency of the rotor system, if the maximum spectral peak of the spectrum is located at [0.99f r , 1.01f r ] range and the amplitude exceeds 2% of the rotational frequency, it can be determined that the rotor system has a rubbing fault; otherwise, it is determined that the rotor system does not have a rubbing fault; the nonlinear compression transformation includes the following steps:

[0036] S100: Calculate the short-time Fourier...

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Abstract

The invention discloses a rotor rub impact fault detection method based on nonlinear compression conversion and a rotor rub impact fault detection system based on nonlinear compression conversion, and the method and the system are used for detecting the rub impact fault of a rotor system in a rotating machine. The method comprises the following steps of performing nonlinear compression conversion on a vibration signal of the rotor system so as to obtain time-frequency representation of the vibration signal; calculating the instantaneous frequency of the vibration signal in combination with the time-frequency representation; further calculating the frequency spectrum of a vibration part of the instantaneous frequency; if fr is the rotating frequency of the rotor system, the maximal spectrum peak of the frequency spectrum is within a range of [0.99fr,1.01fr] and the amplitude value is greater than 2% of the rotating frequency, judging that the rotor system has a rub impact fault; otherwise, judging that the rotor system does not has a rub impact fault. The system is implemented on the basis of the method and is capable of facilitating application of the method. By virtue of the method and the system, whether the rub impact fault exists or not can be accurately judged, and the result is rapid and reliable; the method and the system are simple and easy and are applicable to online health monitoring of a rotor.

Description

technical field [0001] The invention relates to the field of fault diagnosis of rotating machinery, in particular to a method and system for detecting a rotor rubbing fault based on nonlinear compression transformation. Background technique [0002] Rubbing of moving and static parts is a common type of fault in rotating machinery. If it is light, it can cause friction damage to moving and static parts, and if it is serious, it can cause serious friction and collision failures. When rubbing occurs, it is generally local rubbing first, and rubbing intensifies and eventually leads to rubbing for the whole week. Therefore, it is of great practical significance to adopt effective signal processing methods to timely and accurately detect rubbing faults to prevent major rubbing accidents. [0003] The traditional rubbing fault signal processing method judges whether there is a rubbing fault through spectrum analysis to determine whether there is a rotor system rotation frequency,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01H1/14
Inventor 王诗彬陈雪峰丁宝庆同超玮
Owner XI AN JIAOTONG UNIV
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