The purpose of this paper is to examine the roll damping characteristics by bilge keels on the fishing vessel. Unlike other degree of freedom motions, roll motion is highly nonlinear. However the quantitative evaluation of roll damping combined with waves is very important for the fishing vessel. To reduce roll motion, roll motion stabilizers such as a bilge keel is used due to easy made and cheap cost rather than anti-rolling tank and fin-stabilizer. Authors paid attention to the shape of bilge keel and waves to grasp the roll damping for the fishing vessel and studied about the difference of tendencies of roll angle following the shapes of bilge keel. The model ship was the offshore large purse seiner and four types of bilge keel were used. The data from the experiments were provided and analyzed to investigate the rolling characteristics of the model ship being affected by the wave height, wave period and bilge keel shape. The results of the study showed that three types of the bilge keel have little effective, but only one has an effect on the roll damping. So bilge keel shape and its attachment method need to be a future study for the practical use in fishing vessel.

• 김용직 | Yong-Jig KIM
• 강일권(부경대학교 조선해양시스템공학과) | Il-Kwon KANG (Dep. of Naval Architecture & Marine System Engineering, Pukyong National University, Busan 608-737, Korea) Corresponding author
• 박병수(부경대학교 조선해양시스템공학과) | Byung-Soo PARK (Dep. of Naval Architecture & Marine System Engineering, Pukyong National University, Busan 608-737, Korea)
• 함상준(부경대학교 조선해양시스템공학과) | Sang-Jun HAM (Dep. of Naval Architecture & Marine System Engineering, Pukyong National University, Busan 608-737, Korea)