Aerodynamic database update from the flight tests using system identification techniques is a crucial tool for the development of control laws and high fidelity simulators. For the certification of aircraft under test, aero-database needs to be validated from flight tests throughout the flight envelope and also to certain levels beyond the envelope boundaries. Validation of aero-database close to envelope boundaries entails additional complexities which necessitates careful handling of flight data identification and update process. This paper discusses the approach adopted for aero-database update and flight clearance, followed by a discussion on the issues relevant in the extreme flight test regimes, such as, flow angle accuracy at higher angles-of-attack, center-of-gravity variation with fuel pitch angle for high-g maneuvering conditions and inaccuracies in Mach number at transonic speeds. Results from flight data identification of a high performance aircraft with relaxed static stability are presented to highlight the impact of each of these factors on aero-database update.


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    Title :

    Validation and Update of Aerodynamic Database at Extreme Flight Regimes


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2015 AeroTech Congress & Exhibition ; 2015



    Publication date :

    2015-09-15




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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