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A multi-information fusion fault diagnosis method and system for a vector nozzle control system

A technology of multi-information fusion and control system, which is applied in the field of multi-information fusion fault diagnosis of the vector nozzle control system, can solve the problems of low accuracy rate, improve accuracy rate, speed up, reduce missed detection rate and false alarm rate Effect

Active Publication Date: 2022-04-19
BEIHANG UNIV +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-information fusion fault diagnosis method and system of a vector nozzle control system to solve the problem of low accuracy of the existing single sensor in the fault diagnosis process

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  • A multi-information fusion fault diagnosis method and system for a vector nozzle control system
  • A multi-information fusion fault diagnosis method and system for a vector nozzle control system
  • A multi-information fusion fault diagnosis method and system for a vector nozzle control system

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Embodiment approach

[0072] Based on the multi-information fusion fault diagnosis method of the vector nozzle control system provided by the present invention, as an optional embodiment of the present invention, the flow of the multi-information fusion fault diagnosis method based on D-S evidence theory is as follows:

[0073] Step 1: Obtain multi-source data information of the vector nozzle control system. Vector Nozzle A 91 The four failure modes of the actuating circuit are the diagnostic framework, that is, θ={F 1 , F 2 , F 3 , F 4}, representing system normality, servo valve wear, actuator wear and LVDT sensor drift, respectively. When a circuit of the vector nozzle device fails, it will affect the change of its own sensor signal, and at the same time, it will also affect the sensor signal in its coupled circuit, making other circuits appear certain fault characteristics. Therefore, the sensor signals with higher sensitivity to the fault state in the three loops of the vector nozzle cont...

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Abstract

The invention relates to a multi-information fusion fault diagnosis method and system of a vector nozzle control system. The method includes: obtaining multi-source data information under the working state of the vector nozzle control system, and dividing the multi-source data information into a training set and a test set; performing wavelet denoising on the multi-source data information in the training set Processing, determining the multi-source information data set; performing fault feature extraction on each type of multi-source data information in the multi-source information data set, and determining the fault characteristic parameter data set in the multi-information domain; using the principal component analysis method to analyze the fault The feature parameter data set is subjected to dimensionality reduction processing, and the principal element data set is determined; based on the principal element data set, the D-S evidence theory is used to fuse a plurality of the single evidence body information to determine the probability distribution for each of the fault states value, and identify the fault type according to the maximum probability criterion. The invention can improve the accuracy of fault diagnosis.

Description

technical field [0001] The invention relates to the field of fault diagnosis of an aero-engine control system, in particular to a multi-information fusion fault diagnosis method and system for a vector nozzle control system. Background technique [0002] As part of the aeroengine control system, the vector nozzle control system is composed of controllers, actuators, sensors and a large number of electronic components. It can not only provide sufficient thrust for fighter jets, but also cooperate with the aerodynamic force outside the Complete the function of yaw or reverse thrust, thereby greatly improving its own maneuverability and completing difficult movements. The axisymmetric vector nozzle can realize maneuvering deflection at any angle, and has the advantages of light structure, simple control principle, relatively mature technology and low risk. Moreover, the axisymmetric type has little change to the original structure of the engine, so the thrust vectoring technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCG05B23/0262G05B2219/24065
Inventor 石健张优优乔雅静王少萍
Owner BEIHANG UNIV
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