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Ocean Systems Engineering
  Volume 8, Number 2, June 2018 , pages 201-221

Response and control of jacket structure with magneto-rheological damper at multiple locations/combinations
Khaja A.A. Syed and Deepak Kumar

    In this paper a comprehensive study for the structural control of Jacket platform with Magneto-Rheological (MR) damper is presented. The control is implemented as a closed loop feedback of the applied voltage in the MR Damper using fuzzy logic. Nine cases of combinations with MR damper are presented to complete the work. The selection of the MR damper (RD 1005-3) is based on the operating parameters (i.e., the range of frequency and displacement). Bingham model is used to obtain the control forces. The damping co-efficient of the model is obtained using empirical relationship between the voltage in the MR damper and input velocity from the structural members. The force acting on the structure is obtained from Morison equation using P-M spectrum. The results show that the reliable control was obtained when there was a continuous connection of multiple MR dampers with the lower levels of the structure. Independent MR dampers at different levels provided control within a range, while the MR dampers placed at alternate positions gave very high control.
Key Words
    response and control; Jacket platform; multiple MR dampers; wave hydrodynamics; fuzzy logic; morison equation
Khaja A.A. Syed and Deepak Kumar: Ocean Engineering Department, Indian Institute of Technology Madras
Sardar patel road, Opp to C.L.R.I, Adyar, Chennai – 600036, India

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