Grant-in-Aid for Co-operative Research (A)

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The objective of this cooperative research is to develope and establish the rational evaluation method of safety and stability of floating type offshore structures and ships. Firstly the interracation effect of directionality of waves and combined environmental conditions, such as, wind, and current was investigated. Then the mathematical model for time domain simulation of motions of moored floating bodies was developed. With regard to ships the stability in the following waves was investigated. The evaluation method for the stability of life rafts was proposed. The content of the research work is divided into the following ten items: (1) Introduction (2) The state of the arts of rules of stability and safety of offshore structures (3) Statistics of casualty records of offshore structures (4) Stability of ships in following waves (5) Offshore structures in directional waves (6) Offshore structures in wind, wave and current (7) Motions of offshore structures in damaged condition and transient motions after brealxing of mooring lines (8) Low frequency motions of moored vessels (9) Separated flow and hydrodynamic forces around cylinders (10) Stability of life rafts.