Combined neural network circuit fault diagnosis method considering fuzzy group pre-discrimination

A technology of neural network and diagnostic method, which is applied in the field of fault diagnosis of combined neural network circuits considering fuzzy group pre-discrimination, can solve problems such as model accuracy reduction, fault diagnosis difficulty, and impact on diagnosis efficiency, so as to improve accuracy and improve diagnosis Effects, effects with high computational efficiency

Active Publication Date: 2019-05-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in engineering practice, for products with a large number of failure modes and test parameters, it is very difficult to use only one neural network for fault diagnosis. The ...

Method used

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  • Combined neural network circuit fault diagnosis method considering fuzzy group pre-discrimination
  • Combined neural network circuit fault diagnosis method considering fuzzy group pre-discrimination
  • Combined neural network circuit fault diagnosis method considering fuzzy group pre-discrimination

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Experimental program
Comparison scheme
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Embodiment

[0100] Such as figure 2 As shown, the power board of the embodiment of the present invention is powered by 28V externally, and can output 18V and 12V voltages to the outside. A short-circuit risk is set on the power board to realize an open-circuit fault, and a parameter drift fault can be simulated by a portable probe injector.

[0101] Applying the method provided by the present invention, considering the combined neural network circuit fault diagnosis method of fuzzy group pre-discrimination, carrying out fault diagnosis to the described power circuit, the specific steps are as follows:

[0102] Step 1, construct multi-valued D matrix;

[0103] The main steps are as follows:

[0104] 1.1 Build Status-Test Matrix

[0105] Obtain the data of the product in each state, determine the data range of each test point data in each state of the product, and form a state-test matrix, as shown in Table 2 below:

[0106] Table 2 State-Test Matrix

[0107]

[0108]

[0109] T...

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Abstract

The invention discloses a combined neural network circuit fault diagnosis method considering fuzzy group pre-discrimination, and belongs to the technical field of fault diagnosis. The method first determines the fault isolation fuzzy group of a test point to perform separability determination of the fault fuzzy group, establishes a combined neural network diagnosis sub-model for the separable fuzzy group state-test matrix, and uses the combined neural network to complete the fault diagnosis. The method provided by the invention makes the setting of classification labels in the neural network model more reasonable, improves the accuracy of the fault diagnosis based on the neural network, and has high operation efficiency by running at most one neural network model for each diagnosis, whichexpands the application range of the neural network model, and improves the diagnostic effect.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis and relates to a method for fault diagnosis of a combined neural network circuit considering fuzzy group pre-discrimination. Background technique [0002] The failure of the product will affect the system function, cause the system to fail and even cause a major accident. The study of fault diagnosis technology is of great significance to improve system efficiency, reduce downtime, and reduce safety hazards. The fault diagnosis method based on neural network has the ability of self-learning and self-adaptation, and has been widely used in aviation, aerospace, shipbuilding, automobile and other fields. [0003] However, in engineering practice, for products with a large number of failure modes and test parameters, it is very difficult to use only one neural network for fault diagnosis, and the accuracy of the model will decrease with the increase of the number of faults. Establishing a di...

Claims

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Application Information

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IPC IPC(8): G01R31/28G06N3/04
Inventor 王自力石君友邓怡
Owner BEIHANG UNIV
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