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A construction method of hydraulic rudder circuit fault diagnosis system based on svr multi-model

A fault diagnosis system and diagnosis system technology, applied in character and pattern recognition, instruments, design optimization/simulation, etc., can solve the problem that the system is difficult to model accurately, and achieve the effect of avoiding modeling errors and flexible structure

Inactive Publication Date: 2020-02-14
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The nonlinearity and uncertainty of the hydraulic steering gear model itself make it difficult to accurately model such systems

Method used

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  • A construction method of hydraulic rudder circuit fault diagnosis system based on svr multi-model
  • A construction method of hydraulic rudder circuit fault diagnosis system based on svr multi-model
  • A construction method of hydraulic rudder circuit fault diagnosis system based on svr multi-model

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Embodiment Construction

[0048] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0049] The object of the embodiment of the present invention is a typical hydraulic rudder circuit, its structure diagram is as follows figure 1 shown. The rudder circuit is composed of a controller, an electro-hydraulic servo valve, a hydraulic cylinder, a displacement sensor and a load. The output signal of the displacement sensor is fed back to the input end of the system to form a position closed loop. When the system is running, the electro-hydraulic servo valve amplifies, converts and controls the high-power hydraulic energy from the electrical signal output by the controller, and pushes the piston rod of the hydraulic cylinder to move, thereby driving the aircraft steering surface to deflect. The present invention proposes a hydraulic rudder circuit fault diagnosis system construction method based on SVR multi-model for this type of closed-loop system, an...

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Abstract

The invention relates to a construction method of a hydraulic rudder circuit fault diagnosis system based on SVR multi-models, comprising three steps of designing a hydraulic rudder circuit fault diagnosis system based on SVR multi-models, training fault diagnosis SVR model groups, and testing the fault diagnosis system. The fault diagnosis system has a flexible structure and can be adjusted according to the number of measurable states and fault types of the hydraulic rudder circuit. The fault diagnosis system trains the SVR model group by collecting the historical data of each state of the rudder circuit under typical conditions, so that it can approach the dynamic characteristics of each state. The output of the model group is then compared with the actual output, and fault detection and isolation are performed based on the generated residual set. Since the SVR model training process does not depend on the precise model of the steering gear, the problem of reduced reliability of fault diagnosis caused by modeling errors is avoided. Therefore, this method is more suitable for engineering applications.

Description

technical field [0001] The invention belongs to the technical field of hydraulic rudder circuit fault diagnosis, and relates to a construction method of a hydraulic rudder circuit fault diagnosis system based on SVR multi-model. Background technique [0002] The hydraulic rudder circuit is an indispensable part of the aircraft automatic control system, which has a significant impact on the safe take-off and landing of the aircraft and flight performance. A typical hydraulic rudder circuit is mainly composed of three components: electro-hydraulic servo valve, hydraulic cylinder, and displacement sensor, and the faults of the rudder circuit are mainly concentrated on these three components. There are many types of electro-hydraulic servo valve faults, which can be roughly divided into leakage type, blockage type, stuck type, and electrical component faults according to fault performance; hydraulic cylinder faults can be divided into leakage, crawling, and stuck faults; sensor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/62G06F30/20
CPCG06F30/20G06F18/2411
Inventor 李婷谢蓉王剑曹宇燕
Owner NORTHWESTERN POLYTECHNICAL UNIV
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