Abstract
The launch environment is a challenging regime to work due to changing system dynamics, changing environmental loading, joint compression loads that cannot be easily applied on the ground, and control effects. Operational testing is one of the few feasible approaches to capture system level dynamics since ground testing cannot reproduce all of these conditions easily. However, the most successful applications of Operational Modal Testing involve systems with good stationarity and long data acquisition times.
This paper covers an ongoing effort to understand the launch environment and the utility of current operational modal tools. This work is expected to produce a collection of operational tools that can be applied to non-stationary launch environment, experience dealing with launch data, and an expanding database of flight parameters such as damping. This paper reports on recent efforts to build a software framework for the data processing utilizing existing and specialty tools; understand the limits of current tools; assess a wider variety of current tools; and expand the experience with additional datasets as well as to begin to address issues raised in earlier launch analysis studies.
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References
James G, Cao T, Fogt V, Wilson RL, Bartkowitz T (2011) Extraction of modal parameters from spacecraft flight data. In: Proceedings of the 29th international modal analysis conference, Jacksonville, FL, USA
James G, Carne T, Marek E (1994) In-situ modal analysis of STARS missile flight data and comparison to pre-flight predictions from test-reconciled models. In: Proceedings of the 15th institute of environmental sciences aerospace testing seminar, Manhattan Beach, CA, USA
Goursat M, Döhler M, Mevel L, Andersen P (2010) Crystal clear SSI for operational modal analysis of aerospace vehicles. In: Proceedings of the 28th international modal analysis conference, Florida
Zhang L, Wang T, Tamura Y (2010) A frequency-spatial domain decomposition (FSDD) method for operational modal analysis. Mech Syst Signal Process 24(5):1227–1239
Freudinger L, Lind R, Brenner M (1997) Correlation filtering of modal dynamics using the Laplace Wavelet. NASA CR-97-207066
Huang E et al (1998) The empirical mode decomposition and the Hilbert spectrum for non-linear and non-stationary time series analysis. Proc Royal Soc Lond 454:903–993
Bjerg I, Hansen S, Brinker R, Aenlle ML (2007) Load estimation by frequency domain decomposition. In: Proceedings of the 2nd international operational modal analysis conference, Aalborg, pp 669–676
James G, Carne T, Wilson B (2007) Reconstruction of the space shuttle roll-out forcing function. In: Proceedings of the 25th international modal analysis conference, Orlando, FL, USA
Hermans L, Van der Auweraer H (1997) On the use of auto and cross-correlation functions to extract modal parameters from output-only data. In: Proceedings of structural dynamics: recent advances, Southhampton, 14–17 July 1997
Mohanty P, Rixen D (2003) Modifying the ERA identification for operational modal analysis in the presence of harmonic perturbations. In:Proceedings of the 16th ASCE engineering mechanics conference, Seattle, 16–18 July 2003
Campbell R, Vandiver J (1980) The estimation of natural frequencies and damping ratios of offshore structures. In: Proceedings of the 12th annual offshore technology conference, Houston
Briggs M (1981) Multichannel maximum entropy method of spectral analysis applied to offshore structures. WHOI-81-69, Woods Hole Oceanographic Institute, Woods Hole
Ibrahim S (1977) Random decrement technique for modal identification of structures. J Spacecr Rockets 14(4):183–198
Asmussen J, Ibrahim S, Brinker R (1998) Random decrement: identification of structures subjected to ambient excitation. In: Proceedings of the 16th international modal analysis conference, Santa Barbara
James G (2003) Modal parameter estimation from space shuttle flight data. In: Proceedings of the 21st international modal analysis conference, Orlando, FL, USA
Bartkowicz T, James G (2011) Ares 1-X in-flight modal identification. In: Proceedings of the American institute of aeronautics and astronautics structures, structural dynamics, and materials conference, Denver, CO, USA
James G, Carne T, Lauffer J (1995) The natural excitation technique (NExT) for modal parameter extraction from operating structures. SEM Int J Anal Exp Modal Anal 10(4):260
Templeton J, Buerhrle R, Gaspar J, Parks R, Lazor D (2010) Ares 1-X launch vehicle modal test measurements and data quality assessments. In: Proceedings of the XXVIII international modal analysis conference, Jacksonville, FL, USA
Alldredge D (2011) OMA Data Delivery. DCI-TM-081011-1050-01, Dynamic Concepts, Inc., Huntsville
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© 2012 The Society for Experimental Mechanics, Inc. 2012
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James, G. et al. (2012). Operational Analysis in the Launch Environment. In: Allemang, R., De Clerck, J., Niezrecki, C., Blough, J. (eds) Topics in Modal Analysis I, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-2425-3_23
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DOI: https://doi.org/10.1007/978-1-4614-2425-3_23
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