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Reliability assessment of point-absorber wave energy converters

机译：点吸收波能量转换器的可靠性评估

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摘要

Ocean wave energy is a clean and inexhaustible energy resource, capable of providing more than 2 TW of energy supply worldwide. Among all the technologies available to convert wave energy, the point-absorber is one of the most promising solutions today, due to its ease of both fabrication and installation. The floaters of point-absorber WECs (wave energy converters) are generally exposed to harsh marine environments with great uncertainties in environmental loads, which make their reliability assessment quite challenging. In this work, a reliability assessment framework, which combines parametric finite element analysis (FEA) modelling, response surface modelling and reliability analysis, has been developed specifically for the floater of point-absorber WECs. An analytical model of point-absorber WECs is also developed in this work to calculate wave loads and to validate the developed FEA model. After the validation through a series of simulations, the reliability assessment framework has been applied to the NOTC (National Ocean Technology Centre) 10 kW multiple-point-absorber WEC to assess the reliability of the floater, considering the fatigue limit state (FLS). Optimisation of key design components is also performed based on reliability assessment in order to achieve target reliability. The results show that for the considered conditions, the WEC floater is prone to experience fatigue failure before the end of their nominal service life. It is demonstrated that the reliability assessment framework developed in this work is capable of accurately assessing the reliability of WECs and optimising the structure on the basis of reliability.
机译：海浪能源是一种清洁且取之不尽的能源，能够为全球提供超过2 TW的能源供应。在所有可转换波能的技术中，点吸收器由于易于制造和安装而成为当今最有前途的解决方案之一。点吸收式WEC（波能转换器）的漂浮物通常暴露于恶劣的海洋环境中，环境负荷存在很大的不确定性，这使其可靠性评估颇具挑战性。在这项工作中，专门为点吸收器WEC的浮动件开发了一个可靠性评估框架，该框架结合了参数有限元分析（FEA）建模，响应面建模和可靠性分析。在这项工作中，还开发了点吸收器WEC的分析模型，以计算波浪载荷并验证开发的FEA模型。通过一系列模拟验证后，可靠性评估框架已应用于NOTC（国家海洋技术中心）10 kW多点吸收器WEC，以考虑疲劳极限状态（FLS）评估浮子的可靠性。还基于可靠性评估来执行关键设计组件的优化，以实现目标可靠性。结果表明，在考虑到的条件下，WEC浮子在其标称使用寿命到期之前容易出现疲劳破坏。事实证明，本文开发的可靠性评估框架能够准确评估电焊机的可靠性，并在可靠性的基础上优化结构。

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