Abstract
This paper explores using steep regular waves to identifying safe operating conditions that avoid capsize. The data is from a multidisciplinary experiment using an autonomous scale-model running a proportional-derivative controller in aft of beam steep regular waves. The test explored relative wave headings from 15\(^\circ \) to 75\(^\circ \) and speeds from 0.1 to 0.4 Froude number. This effort analyzes the resultant ship trajectories to determine if the model obtained the desired operating conditions during each run. For slow speeds, safe operating conditions could not be identified since the requested headings could not be achieved. For moderate speeds, most requested headings could be achieved. At the highest speeds, only relative wave headings closer to beam seas could be explored as the model capsized in stern quartering waves. Results show that wavelength and wave steepness have minimal effects on the model’s ability to achieve a desired heading. Finally, only a limited number of runs are required to verify a safe operating condition since capsizes appear to be consistently repeatable. This research highlights the usefulness of using steep regular waves for capsize testing but also some of its limitations.
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Acknowledgements
The author would like to acknowledge the enormous amount of work put forth by Mr. Richard Bishop, Mr. Joel Park, and Mr. Stephen Laverty in preparing and conducting the model experiment described in this paper. The author would also like to thank Mr. David Hayden for providing access to the data. Finally, the author would like to thank Dr. Paisan Atsavapranee, Dr. Ronald Giachetti, and Ms. Barbara Berlitz for their comments and suggestions. The Research and Sponsored Programs Office at the Naval Postgraduate School provided funding for this effort as part of the institutionally funded Research Initiation Program for new faculty members.
The views expressed in this document are those of the author and do not reflect the official policy or position of the Department of Defense or the U.S. Government. The author states that there is no conflict of interest.
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Klamo, J.T. Multidisciplinary experiment using steep regular waves to determine ship operating conditions that avoid capsize. Multiscale and Multidiscip. Model. Exp. and Des. 1, 119–132 (2018). https://doi.org/10.1007/s41939-018-0012-1
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DOI: https://doi.org/10.1007/s41939-018-0012-1