Diagonally dominant backstepping autopilot for aircraft with unknown actuator failures and severe winds

Ismail, Shaik and Pashilkar, AA and Ayyagari, Ramakalyan and Sundararajan, N (2014) Diagonally dominant backstepping autopilot for aircraft with unknown actuator failures and severe winds. Aeronautical Journal, 118 (1207). pp. 1-28. ISSN 0001-9240

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      Abstract

      This paper presents a novel formulation of the flight dynamic equations that permits a rapid solution for the design of trajectory following autopilots for nonlinear aircraft dynamic models. A robust autopilot control structure is developed based on the combination of the good features the nonlinear dynamic inversion (NDI) method, integrator backstepping method, time scale separation and control allocation methods. The aircraft equations of motion are formulated in suitable variables so that the matrices involved in the block backstepping control design method are diagonally dominant. This allows us to use a linear controller structure for a trajectory following autopilot for the nonlinear aircraft model using the well known loop by loop controller design approach. The resulting autopilot for the fixed-wing rigid-body aircraft with a cascaded structure is referred to as the diagonally dominant backstepping (DDBS) controller. The method is illustrated here for an aircraft auto-landing problem under unknown actuator failures and severe winds. The issue of state and control surface limiting is also addressed in the context of the design of the DDBS controller.

      Item Type: Journal Article
      Additional Information: Copyright to this article belongs to M/s. Royal Aeronautical Society
      Uncontrolled Keywords: Robust autopilot control structure;Nonlinear aircraft dynamic models;Diagonally dominant backstepping (DDBS);Actuator failures
      Subjects: AERONAUTICS > Aeronautics (General)
      Division/Department: Flight Mechanics and Control Division, Flight Mechanics and Control Division, Other, Other
      Depositing User: Ms. Alphones Mary
      Date Deposited: 20 Jul 2015 10:18
      Last Modified: 20 Jul 2015 10:18
      URI: http://nal-ir.nal.res.in/id/eprint/12227

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