Abstract
Sea vessels are exposed to a complex vibration environment, influenced by the sea as well as by operational conditions. Particularly, the hydrodynamic load effects are difficult to estimate analytically. Experimental results are therefore important to verify the analytical models. In the present paper preliminary results from a full-scale modal test of a Ro-Lo vessel carried out for three different operating conditions are presented. Since little full-scale modal testing seems to have been conducted on vessels in operation, the experimental setup together with preliminary modal parameters extracted from the measurements are presented. This preliminary study is focusing on investigating the data with respect to operational conditions and shows a significant variation of the modal damping of the vessel in operation, with approximately 400 %, 200 % and 400 % difference in the first three global vertical bending modes, respectively.
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Notes
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International Ship and Offshore Structures Congress.
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The flume tank can be filled with water in order to change the stability of the structure, which could be needed because of the large deviations in cargo combination.
References
Wilken M (2011) Efficient calculation of fluid structure interaction in ship vibration. In: Advances in marine structures: proceedings of the 3rd International Conference on Marine Structures, Hamburg, Germany
Dynamic response. In: 18th International Ship and Offshore Structures Congress (2012), Rostock, Germany
Rosenow SE, Uhlenbrock S, Schlottmann G (2007) In: Proceedings of second international operational modal analysis conference, Copenhagen, Denmark
Coppotelli G, Dessi D, Rimondi RMM (2008) Output-only analysis for modal parameter estimation of an elastically scaled ship. J Ship Res 52:45–56
Allemang R, Brown D (1987) Experimental modal analysis and dynamic component synthesis—vol 3: modal parameter estimation
Orlowitz E, Brandt A (2013) Influence of correlation estimation methods on damping estimates. In: Proceedings of fifth international operational modal analysis conference, Guimarães, Portugal
Brandt A (2011) Noise and vibration analysis—signal analysis and experimental procedures. Wiley, New York, NY
Acknowledgments
The work presented is supported by the INTERREG 4 A program in Southern Denmark—Schleswig-K.E.R.N., Germany with funding from the European Fund for Regional Development. The authors would also like to thank Flensburger Shipyard for the opportunity for doing the measurements, especially thanks to Karsten Werner and Florian Kemper.
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© 2014 The Society for Experimental Mechanics, Inc.
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Orlowitz, E., Brandt, A. (2014). Modal Test Results of a Ship Under Operational Conditions. In: Allemang, R. (eds) Topics in Modal Analysis II, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-04774-4_20
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DOI: https://doi.org/10.1007/978-3-319-04774-4_20
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