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Water pump rotor system power frequency vibration abnormity fault diagnosis method

A technology for water pump rotor and fault diagnosis, applied in special data processing applications, based on specific mathematical models, instruments, etc., can solve problems such as structural structure and difficulty in determining conditional probability tables, and achieve the effect of simple determination

Active Publication Date: 2017-08-15
HOHAI UNIV
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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problems existing in the prior art, the present invention provides a combination of Bayesian network and T-S fuzzy fault tree, which effectively solves the difficult problem of Bayesian network structure and conditional probability table determination in rotor fault diagnosis Fault Diagnosis Method for Abnormal Power Frequency Vibration Applicable to Water Pump Rotor System

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  • Water pump rotor system power frequency vibration abnormity fault diagnosis method
  • Water pump rotor system power frequency vibration abnormity fault diagnosis method
  • Water pump rotor system power frequency vibration abnormity fault diagnosis method

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the specific embodiments with reference to the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0031] Firstly, a T-S fuzzy fault tree for abnormal power frequency vibration of the pump rotor system is constructed. The common faults of the water pump rotor system are simulated on the rotor vibration experiment platform, and the vibration signals of the rotor under different fault conditions are collected by the eddy current sensor, and the frequency spectrum is analyzed to obtain the amplitude distribution of various faults under different frequency components. According to the above Experiments and expert experience show that the specific reasons for the abnormal power frequency vibration of the water pump rotor system include rotor mass imbalance and rotor thermal ...

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Abstract

The invention discloses a water pump rotor system power frequency vibration abnormity fault diagnosis method comprising the following steps: 1, building a T-S fuzzy fault tree taking the water pump rotor system power frequency vibration abnormity as top events; 2, converting the built T-S fuzzy fault tree into a diagnosis Bayes network according to specific conversion rules; 3, using the diagnosis Bayes network strong inferences to carry out fault diagnosis. The method can well solve the problems that Bayes network structural elements and a condition probability table are hard to determine, and the diagnosis result is better than a conventional method based on the Bayes network.

Description

technical field [0001] The invention belongs to the field of fault diagnosis, and in particular relates to a method for diagnosing abnormal power frequency vibration faults applicable to a water pump rotor system. Background technique [0002] The operating state of a large pumping station unit is affected by hydraulic, mechanical, and electromagnetic coupling, and the factors that affect its efficiency or cause failures often have multiple mappings, which is a typical large-scale, nonlinear complex system. As the main component of the pump unit, the rotor has been found that more than half of the failures of rotating machinery are caused by rotor failures. Therefore, its fault diagnosis is the most important thing in the fault diagnosis of the whole pump unit. [0003] As an intelligent method integrating probability theory, graph theory, decision theory and other knowledge, Bayesian network has been paid more and more attention in the field of fault diagnosis, especially ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06K9/62G06N7/00
CPCG06F30/20G06N7/01G06F18/29
Inventor 毕竹清李旭杰李臣明高红民
Owner HOHAI UNIV
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