... is conducted to confirm correctness of the analysis method. Utilizing this analysis method, an optimization method called Genetic Algorithm (GA) is then employed to find an optimal model shape. In GA implementation, the fitness of each model, which is defined as Performance Index (PI) in this study...

..., the controller outputs the forces in x-, y-direction and moment (Fu~, Fur, Me, see Fig.3) to control the position, and the thruster azimuth of multiple thrusters is determined by the TAL using the Lagrange method of undetermined multipliers with performance index described by thrust of the thrusters...

... cases by minimizing each quadratic performance index. The results indicate that the active-control system could reduce the resonance amplitude of the pipe string by about 80% as compared with that of the mining system without any controls, and that this reduction rate is about 30% greater than...

... in the design of a mooring system for a semisubmersible platform, considering the design constraints and different performance indexes. The analysis of the results illustrates how the choice of the performance index affect the selection of the lines configuration. KEY WORDS: Mooring system, underwater layout...