engleski

NUMERICAL EVALUATION OF OPERABILITY ENVELOPE FOR ULTRA LARGE CONTAINER SHIP IN EXTREME SEAS AND INFLUENCE OF MANEUVERING ON WAVE LOADS

This paper presents two interconnected parts of ship navigation in extreme seas. Possibilities and advices for ship maneuvering for seafarers are one part. Another part is influence of ship maneuvering on wave loads. Principle for making advices is made on operability criteria platform. Influence of maneuvering on wave loads is defined through amount of wave bending moment amidship. Practical example is made for 9200 TEU container ship. Numerical evaluation is carried out via 3D panel method. 2-P Pierson– Moskowitz wave spectrum is used for short term spectral analysis. Rough weather is described according to the IACS recommendation Note No.34. Closedform expressions are used for quick estimate of wave induced bending moment. Results are presented in operability polar plots, operability diagram and speed diagram. In the conclusion, suggestions for better approach in maneuvering calculations are provided and connection of ship operability and amount of wave loads is commented with guidelines for the future research.

container ship; operational criteria; 3D panel method; wave induced bending moment

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