Seakeeping experiment of two side-by-side floating bodies

Smith, Doug (2014) Seakeeping experiment of two side-by-side floating bodies. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (56MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

After determining a need to further investigate the hydrodynamic behavior of the side-by-side floating bodies at a close proximity, model scale experiments were conducted. This experiment changed parameters such as the gap width and wave heading to examine the effects of hydrodynamic interaction. Two initial gap widths, 300 and 450 mm, and four wave headings, 90⁰, 60⁰, 30⁰ and 0⁰, were examined. Each experimental setup was examined over a range of wave frequencies, while free surface elevation and vessel motion responses were monitored and recorded. Analysis of the data showed the narrow gap resonance phenomena. However, the experiment did show little variation of the frequency where gap resonance occurred. Beam seas cases showed one peak frequency where values were significantly amplified compared to surrounding frequencies, while other wave headings showed two peak frequencies. There was little variation of the frequency where resonance occurred for each case. However, the magnitude of amplification did show significant variation over each case. The vessel motion response showed significant amplification over quite broad frequency bands. Beam seas cases showed very little pitch motion but head seas cases showed significant roll motion.

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