Identification of aerodynamic derivatives of a flexible aircraft

Majeed, M and Singh, Jatinder and Kar, IN (2012) Identification of aerodynamic derivatives of a flexible aircraft. Journal of Aircraft, 49 (2). pp. 654-658. ISSN 0021-8669

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THE effects of flexibility on the flight dynamics of large transport aircraft have been shown to be quite significant, especially as the frequencies of the elastic modes become lower and approach those of the rigid body modes [1]. The handling characteristics of such vehicles are altered significantly from those of a rigid vehicle, and the design of the flight-control system may become drastically more complex. Therefore, mathematical modeling of an aeroelastic vehicle for dynamic analysis and control system design is a major issue in flight vehicle dynamics. Consequently, the need to model accurately the dynamics of such vehicles is becoming inevitable. Parameter estimation from flight data, as applied to aircraft in the linear flight regime, is currently being used on a routine basis with the assumption that the rigid body model is valid [2]. Elastic degrees of freedom are, therefore, absent from the aircraft derivative model used in the estimation algorithm. However, the newly introduced highly maneuverable aircraft with a high degree of flexibility poses a new challenge to search for appropriate aeroelastic models for inclusion in parameter estimation algorithms [3]. A simplified integrated modeling approach to account for the aeroelastic effects in aircraft dynamics was suggested in [4], and its use for a highly elastic aircraft was demonstrated. The aeroelastic model of [4] was simplified in [5] and the resulting model, with a reduced number of unknown terms, was used in the identification of the aeroelastic aircraft. In another attempt, parameter estimation from simulated data of a flexible aircraft was carried out by defining the aerodynamic derivatives in a linear form with the quasi-steady aeroelastic effects represented through the flex factor [6].

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. American Institute of Aeronautics and Astronautics
Uncontrolled Keywords: Aerodynamic derivatives;Flexible aircraft;Flight dynamics;Large transport aircraft;Aerodynamic models
Subjects: AERONAUTICS > Aeronautics (General)
AERONAUTICS > Aerodynamics
Depositing User: Ms. Alphones Mary
Date Deposited: 01 Apr 2014 08:26
Last Modified: 01 Apr 2014 08:26

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