Control of Offshore Jacket Platform under Wave Loads Using Self-Powered Semi-Active Tuned Mass Damper

Document Type : Research Article

Authors

1 Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran

2 Department of Mechanic Engineering. Faculty of Engineering University of Maragheh. Maragheh. Iran

3 Department of Civil Engineering University of Maragheh. Maragheh. Iran

Abstract

Offshore jacket platforms play an important role in the oil and energy industry, so controlling the vibrations of these structures and increasing their useful life is of great interest. In this study, the dynamic response of an offshore jacket platform has been investigated under the effect of wave load with a return period of 100 years. To reduce the dynamic response of the platform deck, a self-powered semi-active mass damper (SP-SATMD) was used and its mass ratio was set to 3% by default. The magneto-rheological damper (MR) energy in the semi-active tuned mass damper is supplied by the vibration of the tuned mass damper (TMD) through an energy harvesting system. This system includes DC direct current generator, rack, and pinion. The rack and pinion convert the linear motion of the TMD into an angular motion and apply it to a DC generator to generate the required electrical energy. The energy harvesting system can also act as an electromagnetic damper (EM) and a proportional control algorithm in determining the damping of the magneto-rheological damper. The results show that the maximum displacement and absolute acceleration of the deck of the controlled platform with a semi-active control strategy decreased by 15 and 16.24%, respectively, compared to the uncontrolled structure.

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References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 2
May 2023
Pages 247-264

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