A Study on Optimization of Huge Ocean Structure through the Choice of Hull Forms and Mooring in Waves

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In order to study on "Optimization of Huge Ocean Structuer through the Choice of Hull Forms and Mooring in Waves", the following research items have been done during the term of this project :1) Survey of the optimization method2) Optimization method for the minimum wave exciting forces on a two-dimensional shape of a ocean structure3) Optimization method for the minimum wave exciting forces on a 2-lower hull type ocean structure4) Optimization method for the minimum wave exciting forces on a column supported type ocean structure5) Optimization method for the minimum wave forces on a lower hull type ocean structureFrom this study the following results have been obtained :1) For the elements of huge ocean structure, an optimal shape with minimum wave exciting forces is obtained by use of a present optimization method.2) Same discussion is applied to obtain an optimal shape with minimum transmission coefficients.3) For a overall huge ocean structure is concerned, the wave exciting forces as a measure of merit are to be simplified for the practical calculations. Therefore, in this study, the wave exciting forces are formulated excluding the so called diffraction force due to waves.4) However, the model experiments by use of elements of huge ocean structure showed that the wave period for minimum wave exciting force was different between calculations and experiments. In order to improve this, further study will be carried out.