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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (2): 640-650.doi: 10.7527/S1000-6893.2014.0200

• Electronics and Control • Previous Articles     Next Articles

Characteristic model-based approach for actuator fault diagnosis

ZHU Jihong1, HE Yang1, HUANG Zhiyi2   

  1. 1. State Key Lab of Intelligent Technology and Systems, Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China;
    2. Lanzhou Flight Control Corporation, Ltd., AVIC, Lanzhou 730070, China
  • Received:2013-08-05 Revised:2014-09-05 Online:2015-02-15 Published:2014-09-26
  • Supported by:

    National Natural Science Foundation of China (61104082)

Abstract:

Actuator fault diagnosis is very important to improve flight safety. Nevertheless, some nonlinear problems in classical approaches such as load time variability uncertainty and rate saturation etc. will affect the diagnosis, resulting in false alarm. This paper presents a characteristic model-based fault detection method for actuator to solve the problems. Firstly, a characteristic model used in diagnosis is established according to the bandwidth and the rate saturation of the actuator. Then, the reference responses of the velocity and displacement are calculated with state estimators. Lastly, judging by whether the residuals between the practical velocity or displacement and the references exceed the given thresholds or not, failures in motors or drives can be easily detected. This approach can avoid the false alarm caused by load uncertainty or rate saturation effectively, and the characteristic model, only related to the actuator bandwidth and rate saturation, is provided with the significant advantages of simplicity and practicability.

Key words: actuator, characteristic model, fault detection, characteristic parameter, rate saturation

CLC Number: