A simplified aerodynamic force model based on the physical principle of Prandtl's lifting line theory and trailing vortex concept has been developed to account for unsteady aerodynamic effects in aircraft dynamics. Longitudinal equations of motion have been modified to include these effects. The presence of convolution integrals in the modified equations of motion led to a frequency domain analysis utilizing Fourier transforms. This reduces the integro-differential equations to relatively simple algebraic equations, thereby reducing computation time significantly. A parameter extraction program based on the maximum likelihood estimation technique is developed in the frequency domain. The extraction algorithm contains a new scheme for obtaining sensitivity functions by using numerical differentiation. The paper concludes with examples using computer generated and real flight data. (Stoehr)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Maximum likelihood identification of aircraft parameters with unsteady aerodynamic modeling


    Additional title:

    Identifikation von Flugzeugparametern nach der Maximum-Likelihood-Methode


    Contributors:
    Keskar, D.A. (author) / Wells, W.R. (author)

    Published in:

    AIAA-Papers ; Jan ; 1-9


    Publication date :

    1979


    Size :

    9 Seiten, 5 Bilder, 4 Tabellen, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English