Simplified Formulation of Coupled System Between Moored Ship and Elastic Pipe for OTEC Plantship

Volume 5: Ocean Space Utilization Pub Date : 2021-06-21 DOI:10.1115/omae2021-62122

Ryoya Hisamatsu, T. Utsunomiya

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引用次数: 1

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.

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OTEC船系泊船与弹性管耦合系统的简化公式

商业规模的海洋热能转换(OTEC)浮动平台将需要连接一个大直径的冷水管(CWP)。一些研究分析了浮动平台与CWP之间耦合系统的动力特性。然而，耦合行为的特征尚未完全了解。本研究旨在建立OTEC浮式装置的耦合系统，并对公式进行简化，以阐明耦合行为的特点。该公式适用于数值模拟结果的验证和OTEC装置的初步设计。本文第一部分推导了直接系泊浮体和悬挂在浮体上的弹性管的运动方程和平衡方程。在第二部分中，我们验证了一个长度为800m, CWP直径为12m的100MW OTEC电厂的公式。通过求解运动方程计算了响应幅值算子(RAO)，并与OrcaFlex的数值模拟结果进行了比较。通过比较，我们发现该公式适用于实际设计回路的早期阶段。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Volume 5: Ocean Space Utilization

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