A controller design for offshore structures is discussed in this study.udStochastic simulation is considered for evaluation of the system'sudperformance in the design stage. This way, nonlinear characteristics ofudthe structural response and excitation are explicitly incorporated intoudthe model assumed for the system. Model parameters that have someudlevel of uncertainty are probabilistically described. In this context, theudcontroller is designed for optimal reliability, quantified as theudprobability, based on the available information, that the performanceudwill not exceed some acceptable bounds. This treatment leads to audrobust-to-uncertainty design. The methodology is illustrated in anudexample involving the control of a Tension Leg Platform in a randomudsea environment. Multifold nonlinearities are taken into account for theudevaluation of the platform's dynamic response and a probabilisticuddescription is adopted for characterizing the random sea environment.
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