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首页> 外文期刊>Renewable energy >Structural health monitoring of grouted connections for offshore wind turbines by means of acoustic emission: An experimental study
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Structural health monitoring of grouted connections for offshore wind turbines by means of acoustic emission: An experimental study

机译：通过声发射监测海上风力发电机注浆连接的结构健康：一项实验研究

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Grouted connections for offshore wind turbines are formed by attaching overlapping steel piles with an ultra-high strength cementitious grout. The structural performance of grouted connections is critical for the substructures in order to exhibit sufficient resistance to environmental loads. The long-term integrity of the grout core can be compromised due to the complex stress states present, leading to unexpected slippage and gaps in the steel-grout interface, grout cracking and water ingress. This paper presents the results of an experimental investigation on damage evolution and failure mechanisms occurring within grouted connections in laboratory-based bending tests using acoustic emission. A parametric analysis of the detected acoustic emission signals has been conducted. The acoustic emission activity has been correlated with load-displacement measurements and the observed specimen failure modes. For the tested grouted connections, the number of acoustic emission hits and the signal duration were employed to identify damage evolution during load application. Root mean square and the ratio of rise time to amplitude were found to be useful Key Performance Indicators (KPIs) for damage prognosis. Finally, an improved b-value analysis has been performed, and the computed drops were well-associated with grout cracking within the connection. Crown Copyright (C) 2019 Published by Elsevier Ltd. All rights reserved.
机译：海上风力涡轮机的注浆连接是通过将重叠的钢桩与超高强度水泥浆连接在一起而形成的。灌浆连接的结构性能对于子结构至关重要，以便对环境载荷具有足够的抵抗力。由于存在复杂的应力状态，水泥浆芯的长期完整性可能会受到损害，从而导致水泥浆界面发生意外滑动和缝隙，水泥浆开裂和进水。本文介绍了在基于声发射的基于实验室的弯曲测试中，在灌浆连接内发生的损伤演变和破坏机理的实验研究结果。已对检测到的声发射信号进行了参数分析。声发射活动已与载荷位移测量和观察到的样品破坏模式相关。对于测试的灌浆连接，采用声发射的次数和信号持续时间来确定载荷施加过程中的损伤演变。均方根和上升时间与振幅的比率被发现是用于损伤预后的关键绩效指标（KPI）。最终，进行了改进的b值分析，并且计算得出的液滴与连接内的灌浆裂缝紧密相关。 Crown版权所有（C）2019，由Elsevier Ltd.出版。保留所有权利。

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