Estimation methods for determination of drag characteristics of fly-by-wire aircraft

Girija, G and Basappa, - and Raol, JR and Padma, Madhuranatha (2001) Estimation methods for determination of drag characteristics of fly-by-wire aircraft. Defence Science Journal, 51 (1). pp. 83-92.

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    Abstract

    In this paper, several parameter/state estimation approaches for the determination of dragpolars from flight data are described and evaluated for a fly-by-wire (FBW) aircraft. Both model-based approaches (MBAs) and non-model-based approaches(NMBAs) are considered. Dynamic response data from roller coaster and wind-up-turn manoeuvres are generated in a FBW aircraft flight simulator at different flight conditions and the typical performance results are presented. A novel approach to estimate the drag polar has been evaluated. It has been found that the NMBAs perform better than the MBAs. Classically, the MBAs have been used for the determination of drag polars. The merits of an NMBA are that it does not require specification of the detailed model of the aerodynamic coefficients and it can be suitably used for online estimation of drag polars from the flight data of aerospace vehicles.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to DESIDOC
    Uncontrolled Keywords: Drag polar determination;Model-based approaches;Non-model based approaches;Fly-by-wire aircraft;Flight simulator
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    AERONAUTICS > Aerodynamics
    Division/Department: Flight Mechanics and Control Division, Flight Mechanics and Control Division, Flight Mechanics and Control Division, Flight Mechanics and Control Division
    Depositing User: M/S ICAST NAL
    Date Deposited: 29 Jan 2008
    Last Modified: 17 Jun 2010 10:14
    URI: http://nal-ir.nal.res.in/id/eprint/4549

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