Browsing by Author "Abdel-Rohman M."

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    A nonlinear controller for offshore structures under wave excitations
    (2001) Terro M.J.; Mahmoud M.S.; Abdel-Rohman M.; Department of Civil Engineering; Kuwait University; PO Box 5969; Safat-13060; Kuwait; Modern Sciences and Arts University; Amer Street; Dokki; Egypt
    In this paper, a new feedback-control design is developed and applied to an offshore structure under wave excitation. The nonlinear Morison equation is employed to estimate the wave forces. The feedback-control design proceeds in two consecutive stages: a nominal stage based on linear quadratic theory for regulating a linear part of the system dynamics, and an adjustment stage in the form of a nonlinear controller with a tuning gain factor for accommodating the nonlinearities while maintaining the overall stability. A SIMULINK model is designed to simulate the response of a three-floor steel jacket platform example. Results of the simulation of this structure with and without feedback-control are discussed to demonstrate the effectiveness of this control method.