In this paper, we consider the problem of estimating the parameters in mathematical models of complex systems from experimental observations; the methods and procedures that we develop are general, but in this work we make specific reference to the problem of parameter estimation for multibody-based rotorcraft vehicle models from flight test data. We consider methods that are applicable to unstable systems, since rotorcraft vehicles are typically unstable at least in certain flight regimes. Unstable vehicles must be operated in closed-loop, and this must be explicitly accounted for when formulating parameter estimation methods. We describe two alternative classes of methods in the time domain, namely, the recursive filtering and the batch optimization methods. In the recursive approach, we formulate a novel version of the extended Kalman filter that accounts for the presence of unobservable states in the model. In the case of the batch optimization methods, we present a formulation based on a new single-multiple shooting approach, specifically designed for models with slow and fast solution components. We perform some initial steps toward the validation of the proposed procedures with the help of applications regarding manned and unmanned rotorcraft vehicles.
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July 2010
Research Papers
Parameter Estimation of Multibody Models of Unstable Systems From Experimental Data, With Application to Rotorcraft Vehicles
Carlo L. Bottasso,
Carlo L. Bottasso
Dipartimento di Ingegneria Aerospaziale,
e-mail: [email protected]
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italy
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Fabio Luraghi,
Fabio Luraghi
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italy
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Andrea Maffezzoli,
Andrea Maffezzoli
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italy
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Giorgio Maisano
Giorgio Maisano
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italy
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Carlo L. Bottasso
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italye-mail: [email protected]
Fabio Luraghi
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italy
Andrea Maffezzoli
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, Italy
Giorgio Maisano
Dipartimento di Ingegneria Aerospaziale,
Politecnico di Milano
, Via La Masa 34, I-20156 Milano, ItalyJ. Comput. Nonlinear Dynam. Jul 2010, 5(3): 031010 (10 pages)
Published Online: May 18, 2010
Article history
Received:
July 25, 2009
Revised:
March 8, 2010
Online:
May 18, 2010
Published:
May 18, 2010
Citation
Bottasso, C. L., Luraghi, F., Maffezzoli, A., and Maisano, G. (May 18, 2010). "Parameter Estimation of Multibody Models of Unstable Systems From Experimental Data, With Application to Rotorcraft Vehicles." ASME. J. Comput. Nonlinear Dynam. July 2010; 5(3): 031010. https://doi.org/10.1115/1.4001390
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