A Method for Intermittent Fault Diagnosis of Aircraft Based on Dual Observers

Abstract

The invention discloses an aircraft intermittent fault diagnosis method based on dual observers. Firstly, an unknown input fault diagnosis observer is constructed, and then a fault learning observer is constructed, and a gain matrix of the fault learning observer is designed. Finally, intermittent fault diagnosis is performed according to the residual error. Fault detection, using fault learning observers for fault isolation. This aspect can diagnose the occurrence time of intermittent faults in real time, realize fault isolation based on the learning observer, and determine which actuator has failed, thereby improving the effect of fault diagnosis and expanding the scope of application. It breaks through the limitation that the current unknown input observer can only detect intermittent faults but cannot separate faults, and improves the effect of fault diagnosis.

Description

technical field [0001] The invention belongs to the technical field of aircraft, and in particular relates to an aircraft intermittent fault diagnosis method. Background technique [0002] The spacecraft system is complex, and the modules are closely connected and interact with each other. At the same time, due to the harsh environment and electromagnetic interference, intermittent failures are prone to occur. Intermittent failure is a type of non-permanent failure that lasts for a short time, recurs, and disappears without treatment. The observer-based fault diagnosis method is an important fault diagnosis method. This method mainly generates redundant states by constructing the observer of the original system, and obtains the residual by making a difference between the estimated value and the actual value. Finally, the residual is calculated. Evaluation, to make a judgment whether the system is faulty. Intermittent faults have a cumulative effect, and the frequency of in...

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Problems solved by technology

[0003] In the article "Missile Intermittent Fault Diagnosis Based on Unknown Input Observer" (Feng Gang, Yang Zhiyong, Liu Yongjin, "Measurement and Control Technology", Issue 36, Volume 9, 2017), an intermittent fault diagnosis method based on unknown input observer is proposed , this method generates decoupling residuals from a single unknown input observer to detect intermittent faults, but this method does not achieve fault isolation, that is, to separate which actuator has failed

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