Crack detection in offshore platform structure based on structural intensity approach. (17th February 2017)

• Record Type: Journal Article
• Authors: Tian, Xiaojie; Liu, Guijie; Gao, Zhiming; Chen, Pengfei; Mu, Weilei
• Is Part Of: Journal of sound and vibration. Volume 389(2017)
• Page Start: 236
• Page End: 249
• Publication Date: 2017-02-17
• Subjects: Offshore platform -- Crack detection -- Structural intensity -- Power flow; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2016.11.020
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: 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.