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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (2): 637-647.doi: 10.7527/S1000-6893.2015.0139

• Electronics and Control • Previous Articles     Next Articles

A nonlinear fault tolerant flight control method against structural damage

WANG Qian, LI Qing, CHENG Nong, SONG Jingyan   

  1. Department of Automation, Tsinghua University, Beijing 100084, China
  • Received:2015-02-27 Revised:2015-05-19 Online:2016-02-15 Published:2015-05-27
  • Supported by:

    National Natural Science Foundation of China(61174168);Aeronautical Science Foundation of China(20100758002,20128058006)

Abstract:

Structural damage can affect system static stability and control precision by changing aircraft aerodynamic parameters. A nonlinear fault tolerant flight control scheme against aircraft structural damage is presented, which implements the adaptive backstepping control method with a second-order command filter. The fault tolerant control is applied to a multi-input nonlinear aircraft model. In order to compensate the influence from structural damage, the aircraft aerodynamic parameters are estimated on-line and the controller is adaptively regulated. A command filter is employed to avoid the complex derivative computation in the backstepping method. The stability of the closed-loop system with the command filter is proved. The upper bounds of control tracking errors and the lower bounds of the frequency parameters in the command filters are also analytically presented. The proposed nonlinear fault tolerant control method is verified by a simulation of a large commercial aircraft with loss of the vertical tail.

Key words: structural damage, fault tolerant flight control, command filter, adaptive backstepping control, nonlinear control

CLC Number: