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Communication Dans Un Congrès Année : 2013

Identifiability investigation of the aerodynamic coefficients from free flight tests

Résumé

The identification of the aerodynamic coefficients, based on free flight measurements, remains a difficult task for flying vehicles like space vehicles, munitions, UAV. This is mainly due to the nonlinear structure of the mathematical model describing the behavior of the vehicle in flight, the absence of an input signal, the unknown initial conditions and the nonlinear dependence of the aerodynamic coefficients on several state variables. Under these conditions, the estimation of the model parameters must be processed with caution. In this paper, we propose a new procedure for the identification of the aerodynamic coefficients, and more precisely the pitch damping coefficient of a re-entry space vehicle. This approach is based on system identification techniques and several steps are required, like the polynomial description of the coefficient as a function of the Mach number and the total angle of attack, the a priori and a posteriori identifiability study, followed by the estimation of the parameters in question based on real experimental free flight measurements. This model-based method improves the accuracy of the estimated coefficient.
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Dates et versions

hal-00911877 , version 1 (30-11-2013)

Identifiants

  • HAL Id : hal-00911877 , version 1

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Marie Albisser, Simona Dobre, Claude Berner, Magalie Thomassin, Hugues Garnier. Identifiability investigation of the aerodynamic coefficients from free flight tests. AIAA Atmospheric Flight Mechanics Conference, Aug 2013, Boston, Massachusetts, United States. ⟨hal-00911877⟩
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