In this work, the capability of Operational Modal Analysis (OMA) approaches to deal with time-varying system in the low-frequency domain are investigated. Specifically, a launch-vehicle, working under actual operative conditions and characterized by a large mass variation due to fuel burning, is studied and its modal properties are identified in terms of natural frequencies, damping ratio coefficients and mode shapes. Two OMA methods are considered: the Frequency Domain Decomposition (FDD) and the Hilbert Transform Method (HTM). It is demonstrated that both OMA approaches allow the time-tracking of modal parameters from the response accelerations only recorded during actual flight tests of the studied launcher.
OMA study on the structural dynamic properties of a launcher vehicle using flight data / Eugeni, Marco; Coppotelli, Giuliano; Mastroddi, Franco; Gaudenzi, Paolo; Muller, S.; Troclet, B.. - STAMPA. - 5:(2017), pp. 3343-3368. (Intervento presentato al convegno 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference tenutosi a Grapevine; United States nel 9 - 13 January 2017) [10.2514/6.2017-1827].
OMA study on the structural dynamic properties of a launcher vehicle using flight data
EUGENI, MARCO;COPPOTELLI, Giuliano;MASTRODDI, Franco;GAUDENZI, Paolo;
2017
Abstract
In this work, the capability of Operational Modal Analysis (OMA) approaches to deal with time-varying system in the low-frequency domain are investigated. Specifically, a launch-vehicle, working under actual operative conditions and characterized by a large mass variation due to fuel burning, is studied and its modal properties are identified in terms of natural frequencies, damping ratio coefficients and mode shapes. Two OMA methods are considered: the Frequency Domain Decomposition (FDD) and the Hilbert Transform Method (HTM). It is demonstrated that both OMA approaches allow the time-tracking of modal parameters from the response accelerations only recorded during actual flight tests of the studied launcher.File | Dimensione | Formato | |
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Eugeni_OMA-study_2017.pdf
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AIAA_Frontespizio-Structures-structural_2017.pdf
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Note: http://dx.doi.org/10.2514/MSDM17
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