Identification of Location and Severity of Damages in the Offshore wind Turbine Tripod Platform by Improved Modal Strain Energy Method

Subject Areas : Analysis of Structure and Earthquake

Seyed Reza Samaei ¹ , Madjid Ghodsi Hassanabad ² , amin karimpor zahraei ³

1 - دکتری - دانشگاه آزاد اسلامی واحد علوم و تحقیقات
2 - Assistant professor, Department of Marine industries, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 - M.Sc., Department of Marine Industries, Coastal Orientation, Ports and Marine Structures, Science and Research Branch, Islamic Azad University, Tehran, Iran

Received: 2021-09-04 Accepted : 2021-11-24 Published : 2021-11-22

Keywords: Health monitoring, Splash zone, Modal strain energy (MSE), Jacket, Offshore platform,

Abstract :

Truss structures are one of the most common offshore structures that are exposed to various damages during their service life. Offshore platforms are exposed to various damages during their useful life. This can hamper the operation of the structure and cause more damage in the future if it grows and the damage increases. The location and severity of damage to structures is usually unknown, therefore, many efforts have been made to achieve an accurate, safe and low-cost way to identify damage to marine structures. Damage detection methods based on dynamic response are one of the non-destructive and practical methods. One of the most important subfields of damage identification based on the dynamic response of the structure is the modal strain energy method. In this paper, applying the modal strain energy method, the location of the damage in an offshore wind turbine tripod platform has been identified. The results presented that the Improved modal strain energy method has a sutible ability to identify the location of single damages with appropriate accuracy, both low intensity and high intensity. Also, in the event that more than one member of the structure is damaged, the written algorithm is able to distinguish the location of the damges, but in addition to the damaged members, some other members may also exhibit a damage index greater than one.