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Volume 16, Issue 32 (11-2020)                   Marine Engineering 2020, 16(32): 119-130 | Back to browse issues page

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Samaei S R, Ghodsi Hassanabad M, Asadian Ghahfarrokhi M, Ketabdari M J. Structural health monitoring of offshore structures using a modified modal strain energy method (Case study: four-leg jacket substructure of an offshore wind turbine). Marine Engineering 2020; 16 (32) :119-130
URL: http://marine-eng.ir/article-1-843-en.html
Structural health monitoring of offshore structures using a modified modal strain energy method (Case study: four-leg jacket substructure of an offshore wind turbine)
Seyed Reza Samaei1 , Madjid Ghodsi Hassanabad * 2, Mohammad Asadian Ghahfarrokhi2 , Mohammad Javad Ketabdari3
1- Department of Civil Engineering, Qeshm International Trading Center- Science and Research Branch, Islamic Azad University
2- Department of Marine industries, Science and Research Branch, Islamic Azad University
3- Department of Marine Technology, Amirkabir University of Technology
Abstract:   (3540 Views)
Four-leg jacket is one of the most widely used offshore structures that is exposed to various damages during its service life. Unlike land structures, offshore structures are always exposed to waves, corrosion and damages, especially in the splash zone. At shallow to intermediate water depths, these structures are commonly used as the substructure of offshore wind turbines.  Passing their service life has made the structural health monitoring of offshore wind turbines necessary. In this research, a modified modal strain energy method is used for damage detection in deck and splash zone members which are more exposed to periodic loads of waves and high corrosive seawater than other members. The results showed the higher accuracy of the improved modal strain energy method compared to the original method (Stubbs index). Also, using improved method resulted in prediction of single and multiple damages, with low and high intensities with appropriate accuracy.  
Keywords: Offshore wind turbine, Damage detection, Modified modal strain energy method, Stubbs index
Full-Text [PDF 686 kb]   (2416 Downloads)    
Type of Study: Research Paper | Subject: Offshore Structure
Received: 2020/06/29 | Accepted: 2020/12/7
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