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- W4293317033 abstract "The effect of a lever arm arrangement on the dynamic response of jacket structure installed with a Magneto-Rheological (MR) damper is investigated in this study. The structure is excited by random ocean waves for significant wave heights of 5 m, 8 m, and 10 m using the Pierson–Moskowitz (PM) spectrum. MR dampers of capacity 1000 kN, 500 kN, and 200 kN are used to study the effect of the lever arm on the control performances of the structure. The jacket structure is numerically modeled using the Finite Element Method (FEM), and the dynamics of MR damper is represented using the phenomenological Bouc-Wen model. The Fuzzy Logic Controller (FLC) that provides the command voltage to the MR damper is optimized using the Genetic Algorithm (GA) with a fitness function based on Root Mean Square (RMS) values of tip displacement and acceleration. The lever arm arrangement was found to enhance the control force, which further aids in reducing the damper capacity although maintaining the same percentage of control. For a 30% lever ratio, the percentage control in RMS displacement achieved for 200 kN, 500 kN, and 1000 kN dampers are 31.9%, 45.2%, and 47%, respectively. The percentage control on RMS displacement was nearly constant for different significant wave heights because of the lever arm arrangement. The numerical results show that the FLC successfully controls the response of the structure, and the lever arm configuration helps in improving damper efficiency" @default.
- W4293317033 created "2022-08-27" @default.
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- W4293317033 date "2022-10-01" @default.
- W4293317033 modified "2023-09-28" @default.
- W4293317033 title "Semi-active control of jacket structure using MR damper and a deformation enhancement device under random ocean waves" @default.
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- W4293317033 doi "https://doi.org/10.1016/j.apor.2022.103323" @default.
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