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American Institute of Aeronautics and Astronautics


    Flight Vehicle System Identification in Time Domain



    Course Outline:

    I. Background
    A. What is system identification, parameter estimation, and simulation?
    B. Systematic Quad-M approach


    II. Design of flight maneuvers for system identification
    A. Practical approach to design multi-step inputs with an overview of different techniques

    III. Kinematic consistency checking of recorded flight test data
    A. Stochastic and deterministic approach to determine systematic sensor errors
    B. Hand-on experience, covering various steps, with test case using provided software and flight data

    IV. Parameter estimation methods in time domain
    A. Least-Squares and Output error method
    B. Filter error methods accounting for atmospheric turbulence
    C. Different optimization methods and practical issues
    D. Nonlinear systems and large scale problems

    V. Applications
    A. Trim point identification
    B. Global model (ATTAS, C-160, DO-328, X-31A)
    1. Aircraft mass properties
    2. Nonlinearities in control surface effectiveness
    3. Functional dependencies on flow variables
    C. Unstable aircraft
    D. Identification of nonlinear phenomenon (ex. Stall hysteresis)
    E. On-line parameter estimation

    VI. Model and Aerodynamic database validation

    VII. Broad classification: Statistical properties, residual analysis, and model predictive quality

    VIII. Proof-of-Match procedures for simulator certification based on FAA tolerances

    IX. Approach to validate and update pre-flight aerodynamic databases using flight data

    X. Demonstration of and hands-on experience with software tools

    XI. Matlab based software tool for parameter estimation in the time domain; hands-on experience with test cases on sample flight data

    XII. Summary of a modular and integrated software tool ESTIMA (Fortran-77 based) with post processing options

    XIII. Wrap-up
    A. Summary
    B. Open discussion and possibilities of addressing actual problems raised by attendee