Automated Application of Full Matrix Capture to Assess the Structural Integrity of Mooring Chains
Automated Application of Full Matrix Capture to Assess the Structural Integrity of Mooring Chains
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DOI：
10.1109/access.2018.2883378
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发表时间：
2018-11
期刊：
影响因子：
3.9
通讯作者：
M. Dissanayake;D. Carswell;Michael Corsar;T. Sattar;M. Sutcliffe;P. S. Lowe;T. Gan
中科院分区：
文献类型：
--
作者：
M. Dissanayake;D. Carswell;Michael Corsar;T. Sattar;M. Sutcliffe;P. S. Lowe;T. Gan
在役系泊链条每天都要承受恶劣的环境条件，这增加了链环完整性评估的必要性。为了维护浮式平台的安全，对系泊链进行定期的结构健康监测是强制性的，也是至关重要的。由于缺乏可及性、现场作业的复杂性以及系泊系统的几何特征，超声波在使用中的系泊链条检测中的应用仍处于起步阶段。随着机器人/自动化系统(即爬链机器人机构)的发展，人们对原位超声检测的兴趣与日俱增。目前，超声波探伤已局限于链环的焊缝区。然而，根据最近对疲劳和残余应力的研究，对链冠的超声检测仍需进一步研究。探讨了超声相控阵全矩阵捕获技术在链冠检测中的新应用。由于链冠的复杂几何形状(即，曲线和有限的访问)，在现有的全矩阵捕获技术中增加了一种表面映射技术。本文提出的检测方法适用于空中和水下的链节。为了给空气检测提供耦合剂，研制了一种连续供水楔形板。考虑了一种可适用于机器人检测的技术的开发，并使用自动机械手进行检测。本文讨论了检测方法和机器人操作手的设计。该技术得到了实验室实验的验证。
In-service mooring chains are subjected to harsh environmental conditions on a daily basis, which increases the necessity of integrity assessment of chain links. Periodic structural health monitoring of mooring chains is mandatory and vital in order to maintain the safety of floating platforms. Application of ultrasound for in-service mooring chain inspection is still in its infancy due to the lack of accessibility, in-field operational complexity, and the geometrical features of mooring systems. With the advancement of robotic/automated systems (i.e., chain climbing robotic mechanisms), interest in in situ ultrasound inspection has increased. At present, ultrasound inspection has been confined to the weld area of the chain links. However, according to recent studies on fatigue and residual stresses, ultrasound inspection of the chain crown should be further investigated. A new application of ultrasonic phased array full matrix capture is discussed in this paper for investigation of the chain crown. Due to the complex geometry (i.e., curved and limited access) of the chain crown, a surface mapping technique has been added to the presented full matrix capture technique. The inspection method presented in this paper is suitable for chain links both in air and underwater. A continuous water supply wedge was developed in order to supply couplant for in-air inspection. Development of a technique that can be adapted for robotic inspection was considered, and an automated manipulator was used to carry out inspections. The design of the inspection method and the robotic manipulator is discussed in this paper. The technique is validated with laboratory experiments.