OMA analysis of a launcher under operational conditions with time-varying properties

The objective of this paper is the investigation of the capability of operational modal analysis approaches to deal with time-varying system in the low-frequency domain. Specifically, the problem of the identification of the dynamic properties of a launch vehicle, working under actual operative cond...

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Published in:CEAS space journal 2018-09, Vol.10 (3), p.381-406
Main Authors: Eugeni, M., Coppotelli, G., Mastroddi, F., Gaudenzi, P., Muller, S., Troclet, B.
Format: Article
Language:English
Subjects:
Aerospace Technology and Astronautics
Damping ratio
Engineering
Flight tests
Hilbert transformation
Modal analysis
Original Paper
Resonant frequencies
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description The objective of this paper is the investigation of the capability of operational modal analysis approaches to deal with time-varying system in the low-frequency domain. Specifically, the problem of the identification of the dynamic properties of a launch vehicle, working under actual operative conditions, is studied. Two OMA methods are considered: the frequency-domain decomposition and the Hilbert transform method. It is demonstrated that both OMA approaches allow the time-tracking of modal parameters, namely, natural frequencies, damping ratios, and mode shapes, from the response accelerations only recorded during actual flight tests of a launcher characterized by a large mass variation due to fuel burning typical of the first phase of the flight.
doi_str_mv 10.1007/s12567-018-0209-5
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subjects Aerospace Technology and Astronautics
Damping ratio
Engineering
Flight tests
Hilbert transformation
Modal analysis
Original Paper
Resonant frequencies
title OMA analysis of a launcher under operational conditions with time-varying properties
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