A rotor rubbing fault detection method and system based on matching demodulation transformation

Active Publication Date: 2017-04-19
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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  • A rotor rubbing fault detection method and system based on matching demodulation transformation
  • A rotor rubbing fault detection method and system based on matching demodulation transformation
  • A rotor rubbing fault detection method and system based on matching demodulation transformation

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Embodiment Construction

[0026] In a basic embodiment, the present invention provides a rotor rubbing fault detection method based on matched demodulation transformation, the method uses a matched demodulation algorithm to obtain an estimated value of instantaneous frequency; calculating the estimated value of instantaneous frequency The spectrum of the oscillating part, if 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;

[0027] The matching demodulation algorithm uses the parameterized model of the instantaneous frequency of the vibration signal of the rotor system to approach the ridge line of the rotational frequency of the rotor system, and then identifies the parameters of the parameterized model, thereby obtain...

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Abstract

The invention discloses a rotor rubbing fault detection method and system based on matching demodulation conversion, and the method and system are used for detecting rotor system rubbing faults in rotating machinery. According to the method, a matching demodulation algorithm is utilized to obtain the instantaneous frequency estimated value; the frequency spectrum of the oscillation part of the instantaneous frequency estimated value is calculated, if fr serves as the rotating frequency of a rotor system, the best spectrum peak of the frequency spectrum ranges from 0.99 fr to 1.01 fr and the amplitude value exceeds the rotating frequency by 2%, it can be judged that the rubbing fault exists in the rotor system; if not, it is judged that no rubbing fault exists in the rotor system. Based on the method, the invention provides an on-line rotor system health detection system. By means of the method and system, whether the rubbing fault exists or not can be accurately judged, and the method and system are fast and reliable in result and easy to operate.

Description

technical field [0001] The invention relates to the field of fault diagnosis of rotating machinery, in particular to a rotor rubbing fault detection method and system based on matching demodulation 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, multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00
Inventor 陈雪峰王诗彬张兴武丁宝庆同超玮
Owner XI AN JIAOTONG UNIV
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