海洋平台结构损伤涡流热成像检测激励线圈设计

海上平台作为海上石油开发的重要设施，处在海水浸泡、冲击等恶劣环境中，很容易出现损伤，影响其安全性。管节点作为高应力集中的部位是海上平台结构中更易产生损伤的地方，因此对管节点进行检测十分重要，为适应海上平台管节点这种特殊结构的损伤检测，利用涡流热成像技术，考虑管节点结构、在管节点表面感应出的涡流分布情况等因素，设计出了圆台形线圈、三角形线圈、扁平双线圈三种形式的线圈，并通过COMSOL、SolidWorks完成了相应的仿真模拟，为了符合实验室需求，又构建出了等比例待测工件及线圈的实际模型，通过实验模拟、MATLAB数据处理验证了仿真模拟的准确性及所设计线圈的有效性。结果表明，扁平双线圈对海上平台管节点的加热效果更佳，能够用于对其损伤缺陷的检测。

Excitation coil design of eddy current thermography forstructural damage detection of offshore platforms

As an important facility for offshore oil development, offshore platforms are prone to damage in harsh environments, such as seawater immersion and impact, which affects their safety. As a high stress concentration area, tubular joints are more prone to be damaged in offshore platforms. Therefore, the detection of tubular joints is of great significance. In order to adapt to the damage detection of the tubular joints that are the special structures on offshore platforms, using eddy current thermography, the structure of the tubular joints and the distribution of eddy currents induced on the surface of the tubular joints are considered, three forms of coil were designed: Round table coil, delta coil and flat double coil, and the corresponding simulation was completed by SolidWorks and COMSOL. In order to meet laboratory requirements, the actual models of coils and the workpiece to be measured were manufactured. The accuracy of the simulation and the effectiveness of the designed coils were verified through experiments and MATLAB data processing. The results show that the flat double coil has better heating effect on the tubular joints of offshore platforms, and can be used to detect the damage defects.