Unveiling modal parameters with forced response using SVD and QR during flutter flight testing

This article presents an algorithm for the identification of modal parameters during flutter flight testing when forced excitation is employed and the aircraft possesses several sensors for structural response acquisition. The main novelty of the method, when compared with other classical modal anal...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part G, Journal of aerospace engineering Journal of aerospace engineering, 2018-01, Vol.232 (1), p.68-76
Main Authors: Barros-Rodríguez, José, Fernández Fructuoso, José Miguel, Flores Le Roux, Roberto, Sánchez Prieto, Sebastián, Rodríguez Polo, Oscar
Format: Article
Language:English
Subjects:
Aerodinàmica
Aeroelasticitat
Aeroelasticity
Aeronàutica i espai
Aircraft
Aircraft components
Amortiment (Mecànica)
Damping
Damping (Mechanics)
Enginyeria mecànica
Excitation
Fighter aircraft
Flight flutter
Flight tests
Flutter
Flutter (Aerodynamics)
Immunity
Modal parameters identification
Parameter identification
QR factorization
SVD
Vibration
Àrees temàtiques de la UPC
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Summary:This article presents an algorithm for the identification of modal parameters during flutter flight testing when forced excitation is employed and the aircraft possesses several sensors for structural response acquisition. The main novelty of the method, when compared with other classical modal analysis methods, is that the analysis is carried out in intervals of time instead of in the whole duration of the excitation. It means that, even when the response signal is only partially available, some modal parameters may be still identified. Application to analytic signals as well as structural response of modern fighter aircraft using frequency-swept excitation is provided in order to demonstrate the effectiveness, robustness and noise immunity of the proposed method.
ISSN:0954-4100
2041-3025
DOI:10.1177/0954410016673393