Study of RLS for Stability Margin Evaluation and Post Failure Data Analysis

Kamali, C and Pashilkar, A. A (2006) Study of RLS for Stability Margin Evaluation and Post Failure Data Analysis. Project Report. National Aerospace Laboratories, Bangalore.

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    Abstract

    This report presents results that demonstrate the application of time domain Recursive Least Squares (RLS) algorithm in flight control and testing. The RLS proposed here is based on the equation error principle and does not require any starting guess for its purpose. A post failure aircraft model estimation, for the purpose of reconfigurable/restructurable control, using RLS and recursive Discrete Fourier Transform (DFT) technique has been carried out. The evaluation shows the superiority of RLS over DFT in terms of computational load and convergence characteristics. Further a stabilized RLS algorithm, which can yield a useful alternative to covariance resetting as a solution to covariance wind-up in RLS has been implemented for post failure aircraft model estimation. A novel technique using RLS has been implemented to perform real time parameter estimation in absence of calibrated angle of attack and sideslip. Finally, the suitability of RLS for real time estimation of stability margin has been demonstrated. Simulated data has been used to demonstrate all these concepts.

    Item Type: Proj.Doc/Technical Report (Project Report)
    Uncontrolled Keywords: Real-time parameter estimation, fault tolerant control, Discrete Fourier Transform, Recursive Least squares, Stabilized RLS, Post failure aircraft model estimation, Calibrated air data, Stability margin estimation
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Flight Mechanics and Control Division, Flight Mechanics and Control Division
    Depositing User: Ms Indrani V
    Date Deposited: 19 Jul 2011 10:13
    Last Modified: 19 Jul 2011 10:13
    URI: http://nal-ir.nal.res.in/id/eprint/9450

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