Near real time stability margin estimation from piloted 3-2-1-1 inputs (AIAA 2002-5820)

Patel, Vijay V and Deodhare, Girish and Chetty, Shyam (2002) Near real time stability margin estimation from piloted 3-2-1-1 inputs (AIAA 2002-5820). In: AIAA's Aircraft Technology, Integration, and Operations (ATIO) 2002 Technical, 1-3 Oct 2002, Los Angeles, California.

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    Abstract

    Near Real Time estimation of stability13; (gain and phase) margins using flight test data from13; development flights of a new aircraft facilitates cost effective flight envelope expansion. Methods based13; on FFT, Z-transforms etc. have been proposed to13; meet this requirement. In this paper a new method13; combining FFT techniques and parameter estimation13; in the frequency domain has been used to accurately13; determine the stability margin of the longitudinal axis13; of a FBW fighter aircraft. Typically during initial13; flight tests of a new aircraft only flight data from13; piloted time domain inputs such as doublets or 3-2-1-13; 1 are available for analysis even though sine sweeps13; are the preferred inputs for determining stability13; margins. Further the aircraft response signals due to13; these inputs have lower bandwidth compared to the13; typical gain and phase crossover frequencies of the13; aircraft + control law loop transfer function. Hence13; estimating the stability margins from these low13; bandwidth signals is a challenging problem.

    Item Type: Conference or Workshop Item (Paper)
    Additional Information: Copyright for this article belongs to American Institute of Aeronautics and Astronautics
    Uncontrolled Keywords: Flight data analysis;ELS simulation;Light combat aircraft (LCA)
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Other, Other, Flight Mechanics and Control Division
    Depositing User: Mr. N A
    Date Deposited: 01 Apr 2009
    Last Modified: 24 May 2010 09:40
    URI: http://nal-ir.nal.res.in/id/eprint/1044

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