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A vibration controller based on wavelet neural network (WNN) is designed for jacket-type offshore platforms with time delay. The offshore platform is regarded as a single-degree-of-freedom (SDOF) system while wave forces are irregular disturbances, and we can rebuild them in the context of Morison equation and wave theory. To reduce the vibration, a WNN vibration controller is designed based on a...
This paper designs a vibration controller based on back propagation neural network (BPNN) for jacket-type offshore platforms with time delay. The offshore structure is simplified into a single-degree-of-freedom (SDOF) system and transformed into a non-delay model. With an system designed to describe wave forces in the context of Morison equation and wave theory, the original vibration control is formulated...
This paper designs a vibration controller based on back propagation (BP) neural network for jacket-type offshore platforms with time delay. With an exosystem designed, we can describe the irregular wave forces in the context of Morison equation and wave theory. The original vibration control can be seen as an optimal control problem. This linear discrete-time system is affected by wave forces as external...
This paper deals with output feedback tracking H∞ control problem for an offshore structure subject to irregular wave forces. In the offshore structure under consideration, an active mass damper is installed at the top of the offshore structure to suppress the vibration of the system. Based on an uncertain dynamic model of the offshore structure, a robust output feedback H∞ tracking controller is...
This paper studies the vibration control of jacket-type offshore platforms with control delay. The main outside forces acting on the offshore platforms are wave and current loads and we consider the effect of current on wave in the model of outside forces. Due to time of computation and application, delay is existent and inevitable in the control process. The paper presents the dynamical model of...
This paper is concerned with optimal guaranteed cost sliding mode control for an offshore steel jacket platform subject to nonlinear self-excited wave force. A nonlinear quadratic performance index which directly associates with the wave force is introduced first. Then, by combining the guaranteed cost control scheme and the integral sliding mode control scheme, an optimal guaranteed cost sliding...
This paper studies the vibration control of jacket-type offshore platforms. A feedforward and feedback optimal controller (FFOC) is developed. The FFOC is proved to be existent and unique. In the design of FFOC, we consider the irregular wave and current forces, and the displacement and velocity of structure. The feasibility and effectiveness of the presented control law is demonstrated by a numerical...
The vibration optimal control with exponential decay rate problem of the offshore jacket platform is studied. An optimal vibration controller is designed for the system affected by the wave load expressed as disturbances produced by exosystems. Numerical simulations illustrate the effectiveness of the proposed controller.
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