The conventional aerodynamic modelling and the methods of high-order non-linear aerodynamic modelling such as high-order Taylor series expansion of aerodynamic forces and moments models, multipoint aerodynamic modelling, non-linear modelling using multi-variate orthogonal functions, and so on are parametric methods of aircraft stability. Control modelling and the high-order methods require a massive effort to be applicable on the aircraft, and a large number of parameters, 1794 parameters at the thirdorder Taylor series expansion, and so on, are needed to model the space of aerodynamics. In contrast to the parametric modelling, the method of wavelet modelling is a non-linear and nonparametric method and only a single wavelet transfer function generates the aerodynamic function, and in comparison to the high-order non-linear parametric modelling, a smaller amount of parameters, 6x20 parameters at this investigation, could simply model the space of aerodynamics precisely. The parametric approach of aircraft parameter estimation is a white box modelling, whereas the wavelet approach leads to a black box model to which no physical significance can be attributed. Although the conventional model is a local model, the new wavelet aerodynamic model could be used as a global model that results when the range of validity covers a large portion of space. In comparison to the conventional approach and other wavelet aerodynamic models that are used at this investigation, the model made by the Morlet wavelet transform shows the best efficiency at the identification of aircraft response while keeping the number of parameters low and the sum square error minimum. At the test aircraft identification process in this paper, the sum square error for the conventional aerodynamic approach using37 coefficients is 17.6496 and the covariance error is 3.4399, whereas in the Morlet aerodynamic model using 6x20 parameters, the sum square error is 2.1217 and the covariance error is 0.1081.


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    Titel :

    Aircraft stability and control model using wavelet transforms


    Weitere Titelangaben:

    Flugzeugstabilität und Steuerungsmodell unter Verwendung von Wavelet-Transformationen


    Beteiligte:
    Mohammadi, S.J. (Autor:in) / Sabzeparvar, M. (Autor:in) / Karrari, M. (Autor:in)


    Erscheinungsdatum :

    2010


    Format / Umfang :

    12 Seiten, 9 Bilder, 4 Tabellen, 42 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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