| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系 === 103 === The core of the article is finding an objective way to modify and optimize the ship bulbous instead of using human manipulation or trial and error .We want to couple with many hydrodynamics as objectives, such as wave making resistance, seakeeping or viscous resistance for our optimization. We use Particle Swarm Optimization (PSO) as our method to find a best design. The algorithm is easy to be developed under our transformation system. We evaluate the ship resistance via famous commercial software named Shipflow and using three dimension panel methods (F3DMP) to compute the six-degree motion.
After the optimization , The test ship KVLCC2 reduces 9% wave drag in single objective case, It also gets 4% improvement of wave drag, 0.4% improvement of Heave and Pitch motion in multiple objectives case. The container has slight improvement of wave drag and seakeeping performance in both cases. However, we have tried to extend the area of transformation, and got more obvious improvements of seakeeping, wave resistance than original case.
Finally, we conclude that single objective case has more obvious improvement than multiple objectives case. Else, the change of bulb has slight influence to seakeeping. In the future, we can widen the area of transformation to achieve an ideal design.
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