Composite fault diagnosis method based on combination of artificial immunity and evidence theory

Abstract

The invention discloses a composite fault diagnosis method based on combination of the artificial immunity and the evidence theory. The composite fault diagnosis method based on the combination of the artificial immunity and the evidence theory comprises the steps that on-line computation of non-dimensional indexes is conducted through vibration monitoring data, and the value range corresponding to the non-dimensional indexes is established during a composite fault; fault diagnosis results obtained through the non-dimensional indexes are converted into credibility distribution by means of the artificial immunity method, diagnosis results of all artificial immunity fault detectors based on the non-dimensional indexes serve as input data through the evidence reasoning algorithm, a final fault diagnosis result serves as output data, a fusion diagnostic model is established, and then composite fault diagnosis is achieved after new input data and new output data are obtained. The composite fault diagnosis method based on the combination of the artificial immunity and the evidence theory fills the blank of a composite fault diagnosis method achieved by means of the advantages of the combination of the artificial immunity and the evidence theory, and real-time and accurate diagnosis of composite faults of rotating machinery is achieved.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of rotating machinery, and in particular relates to a compound fault diagnosis method based on the combination of artificial immunity and evidence theory. Background technique [0002] Currently, dimensionless indicators are widely used in fault diagnosis of rotating machinery. Among the dimensionless indexes, the kurtosis index and pulse index are more sensitive to impact faults, especially in the early stage of fault occurrence, there are fewer large-scale pulses, and the increase of other index values ​​is not much, while the rise of kurtosis index and pulse index value is relatively small. Therefore, these two indicators are more sensitive to the early failure of rotating machinery. However, the failure of rotating machinery operating under actual working conditions is usually a composite failure, that is, the failure of the equipment is the result of multiple single failures concurren...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a composite fault diagnosis method based on the combination of artificial immunity and evidence theory, aiming to solve the problem that the composite fault diagnosis method has not been carried out by using the advantages of the combination of artificial immunity and evidence theory in the current research

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