Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Difference of tension on mooring line by buoy type

부이 형상에 따른 부이줄 장력의 차이

  • Lee, Gun-Ho (Aquaculture Industry Division, West Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Kim, In-Ok (Aquaculture Industry Division, West Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Cha, Bong-Jin (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Jung, Seong-Jae (Fisheries System Engineering Division, National Fisheries Research & Development Institute)
  • 이건호 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 김인옥 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 차봉진 (국립수산과학원 시스템공학과) ;
  • 정성재 (국립수산과학원 시스템공학과)
  • Received : 2014.06.03
  • Accepted : 2014.08.25
  • Published : 2014.08.31
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Abstract

The difference of mooring tension by type of buoy was investigated in the circulating water channel and the wave tank for deducting the most stable buoy from the current and the wave condition. 5 types of buoy made up of short cylinder laid vertically (CL-V), short cylinder laid horizontally (CL-H), capsule (CS), sphere (SP) and long cylinder (CL-L) were used for experiments. A mooring line and a weight were connected with each buoy. A tensile gauge was installed between a mooring line and a weight. All buoy's mooring tension was measured at the same time for the wave test with periods of 1.5~3.0 sec and wave heights of 0.1~0.3 m, and the current test with flow speeds of 0.2~1.0 m/sec. As a result, the order of tension value in the wave test was CL-H > CL-V > SP > CS > CL-L. In the current test CL-V and CL-H were recorded in the largest tension value, whereas SP has the smallest tension value. So it seems that SP buoy is the most effective in the location affected by fast current. CS is predicted to be suitable for a location that influence of wave is important more than that of current if practical use in the field is considered. And it was found that the difference of mooring tension among buoys in wave is related to the product of the cross sectional area and the drag coefficient for the buoy's bottom side in high wave height. The factor for the current condition was not found. But it was supposed to be related to complex factors like a dimension and a shape by buoy's posture to flow.

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References

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