Estimation of neutral and maneuver point of aircraft by dynamic maneuvers

Srinathkumar, S and Madhuranath, Padma and Girija, G and Thomas, Moncy T (1992) Estimation of neutral and maneuver point of aircraft by dynamic maneuvers. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    The Neural point (N[o]) and Maneuver point (N[m]) are important longitudinal stability parameters which critically determine the Aft CG limit of an aircraft. Since these parameters are a function of speed, angle of attack, external store configuration, control surface deployment(slats) etc., extensive flight tests are conducted to accurately deEermine these critical stability parameters. Exisiting methods based on steady state trim flights turn out to be time consuming and are error prone due to the results being dependent on air data and aircraft weight data. In this present report an alternative flight test methodology, based on dynamic maneuver followed by modern aircraft parameter estimation analysis method is proposed to determine N[0] and N[m] simultaneous1y. This results in substantial reduction of flight test time. Further the estimation of stability parameters are independent of air data, mass or inertia data of the aircraft and depend only on the accuracy of CG position of the aircraft and the accuracy of inertial sensors (pitch rate and normal accelerations).

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Neutral point;Maneuver point;Aircraft stability margin; Parameter estimation
    Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
    Division/Department: Flight Mechanics and Control Division, Flight Mechanics and Control Division, Flight Mechanics and Control Division, Flight Mechanics and Control Division
    Depositing User: Mr. Ravikumar R
    Date Deposited: 05 Oct 2006
    Last Modified: 24 May 2010 09:43
    URI: http://nal-ir.nal.res.in/id/eprint/1714

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