Repair and replacement of offshore wind turbine blades are necessary for current and future offshore wind turbines. To date, repair activities are often conducted using huge jack‐up crane vessels and by applying a reverse installation procedure. Because of the high costs associated with installation and removal of offshore wind turbine components and the low profit margin of the offshore wind industry, alternative methods for installation and removal are needed. This paper introduces a novel concept for replacement or installation of offshore wind turbine blades. The concept involves a medium‐sized jack‐up crane vessel and a tower climbing mechanism. This mechanism provides a stable platform for clamping, lowering, and lifting of a blade. A case study of a 5‐MW offshore wind turbine is shown, where common engineering practices were applied and numerical simulations of the marine operations were carried out using finite element and multibody simulation tools. Operational limits for wave and wind actions were established to demonstrate the technical feasibility of the proposed concept.

中文翻译：

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海上风机叶片重大维修和更换概念的数值研究

对于当前和将来的海上风力涡轮机来说，海上风力涡轮机叶片的修理和更换是必要的。迄今为止，通常使用大型自升式起重船并通过反向安装程序进行维修。由于与海上风轮机组件的安装和拆卸相关的高成本以及海上风电行业的低利润率，因此需要用于安装和拆卸的替代方法。本文介绍了一种用于替换或安装海上风力涡轮机叶片的新颖概念。该概念涉及中型自升式起重船和塔式攀爬机构。该机构提供了用于夹持，降低和提升刀片的稳定平台。显示了一个5兆瓦海上风力发电机的案例研究，在那里应用了通用的工程实践，并使用有限元和多体仿真工具对海上作业进行了数值模拟。建立了波浪和风作用的操作极限，以证明所提出概念的技术可行性。