Crack detection in offshore platform structure based on structural intensity approach

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• 作者：Xiaojie Tian^a ; ^b ; Guijie Liu^a ; ^b ; ^{liuguijie039@163.com} ; Zhiming Gao^a ; Pengfei Chen^a ; Weilei Mu^a ; ^b
• 关键词：Offshore platform ; Crack detection ; Structural intensity ; Power flow
• 刊名：Journal of Sound and Vibration
• 出版年：2017
• 出版时间：17 February 2017
• 年：2017
• 卷：389
• 期：Complete
• 页码：236-249
• 全文大小：2906 K
• 卷排序：389

文摘

Structural intensity approach is introduced to study the crack detection for offshore platform in the paper. The Line Spring Model (LSM) of surface crack is proposed based on plate crack structure, and thus the relationship between the additional angle, displacement and crack relative depth is achieved. Besides, the concept of appended structure-borne sound intensity is introduced. The expression of appended structural intensity for crack damage is derived. By observing the input energy, distribution, transmission and vibration performance of structure intensity, evidence is provided for detection of crack location. Vibration analysis is conducted on the whole platform under multi environment load. Using the structural intensity approach, the crack is detected on the key point easily. Moreover, the K-shape welded pipe point is detected using structural intensity approach, and the crack can be detected accurately. Therefore, development structural intensity approach would be extremely useful to spread out technologies that can be applied for offshore platform crack detection accurately.