A multi-fault diagnosis method based on a correlation model

A technology of correlation model and diagnostic method, applied in special data processing applications, complex mathematical operations, instruments, etc., can solve problems such as easy to fall into local optimum, and achieve good engineering application value

Active Publication Date: 2019-02-12
NAVAL AVIATION UNIV
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Problems solved by technology

This method is not limited to a single fault hypothesis, and can be used for multiple fault diagnosis, but this method only searches for the optimal solution, discards the suboptimal solution, and is easy to fall into local optimum

Method used

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  • A multi-fault diagnosis method based on a correlation model
  • A multi-fault diagnosis method based on a correlation model
  • A multi-fault diagnosis method based on a correlation model

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Embodiment

[0036] A correlation model of a control system such as figure 2 As shown, the model has two branches based on the division of function and structure, f 2 and f 3 is a branch, f 4 as a branch. In the model, fault states are detected by corresponding tests along the direction of the arrows. as f 1 occurs, the test results of all tests are failed; f 4 occurs, then only the test t 4 The test result for Failed. The prior probability of each fault state is p(f 1 )=0.1, p(f 2 )=0.2, p(f 3 )=0.3, p(f 4 )=0.4; the test result of the system is t1 = 0, t 2 = 1, t 3 = 1, t 4 =1. The correlation model shows the interconnection relationship between each component of the control system and the correlation relationship between each component and each test, which provides a basis for testing and fault diagnosis.

[0037] Step 1: Perform correlation modeling on the system and obtain the correlation matrix of the system.

[0038] Dependency modeling for a control system such as ...

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Abstract

The invention relates to a multi-fault diagnosis method based on a correlation model. The method comprises the four steps of modeling the system correlation, obtaining a fault-test correlation matrixand a reduced correlation matrix, generating a multi-fault correlation matrix, and carrying out the multi-fault diagnosis, and comprises the steps that firstly, the system is modeled by relativity andthe fault-test correlation matrix is obtained; then, the correlation matrix is reduced according to the system test results, secondly, the logical OR operation is performed on each fault feature vector in the reduced correlation matrix to obtain the multi-fault correlation matrix; and finally, fault diagnosis is carried out based on multi-fault correlation matrix. Based on the correlation model and the test result, the invention can carry out multi-fault diagnosis on the system.

Description

technical field [0001] The invention belongs to the technical field of testing and fault diagnosis, and relates to a multi-fault diagnosis method based on a correlation model. Background technique [0002] The fault diagnosis based on the correlation model is mainly divided into two ways: concurrent diagnosis and sequential diagnosis. Concurrent diagnosis is a traditional monitoring and diagnosis method, that is, to complete all the tests first and then diagnose. The whole process only needs one cycle of testing and diagnosis to realize. Correct diagnosis results, this diagnosis method is more suitable for the situation where the sensor information in the system under test is relatively rich. Sequential diagnosis is a test and diagnosis method with the core of the "test → diagnosis → retest" cycle process, which is suitable for systems in the stages of principle test and prototype development. [0003] The sequential diagnosis method is adopted in the optimal design of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/16
CPCG06F17/16G06F30/20Y04S10/52
Inventor 马羚吕晓峰叶文唐永川贺英政陆巍巍张振姚成柱
Owner NAVAL AVIATION UNIV
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