Simplified formulation of coupled system between moored ship and elastic pipe for OTEC plantship

Ryoya Hisamatsu, Tomoaki Utsunomiya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A commercial-scale Ocean Thermal Energy Conversion (OTEC) floating platform will require a large diameter Cold Water Pipe (CWP) to be attached. Several studies have analyzed the dynamic behavior of the coupled system between the floating platform and the CWP. However, the characteristic of the coupled behavior has not yet been fully understood. This study aims to formulate the coupled system of an OTEC floating plant and simplify the formula to clarify the characteristic of the coupled behavior. The formula is suitable for validation of the numerical simulation results and the preliminary design of an OTEC plant. In the first section of this paper, we derive the equation of motion and equilibrium of the direct moored floating body and an elastic pipe hanged off from the floating body. In the second section, we verify the formula for a 100MW OTEC plantship with 800m length and 12m diameter CWP. The Response Amplitude Operator (RAO) is calculated by solving the equation of motion and statistics responses in 3 hours are compared with a numerical simulation by OrcaFlex. As the result of the comparison, we observed that the present formula is applicable in the early stage of the practical design loop.

Original languageEnglish
Title of host publicationOcean Space Utilization
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791885154
DOIs
Publication statusPublished - 2021
Event2021 40th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2021 - Virtual, Online
Duration: Jun 21 2021Jun 30 2021

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume5

Conference

Conference2021 40th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2021
CityVirtual, Online
Period6/21/216/30/21

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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