Estimation Methods for Determination of Drag Characteristics of Fly-by-Wire Aircraft

  • G. Girija National Aerospace Laboratories, Bangalore
  • J. R. Raol National Aerospace Laboratories, Bangalore
  • Padma Madhuranath National Aerospace Laboratories, Bangalore
Keywords: Aeronautics, Drag, Drag polars, Aerospace vehicles, Flight simulators

Abstract

"In this paper, several parameter/state estimation approaches for the determination of drag polars 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
Published
2002-01-01
How to Cite
GirijaG., RaolJ., & MadhuranathP. (2002). Estimation Methods for Determination of Drag Characteristics of Fly-by-Wire Aircraft. Defence Science Journal, 51(1), 83-92. https://doi.org/10.14429/dsj.51.2208