부이 형상에 따른 부이줄 장력의 차이
Difference of tension on mooring line by bouy type
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The difference of mooring tension by type of buoy was investigated in the circulating water channel and the wave tank for deductingthe 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 of0.1〜0.3 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 wasCL-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 hasthe smallest tension value. So it seems that SP buoy is the most effective in the location affected by fast current. CS is predictedto 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 areaand the drag coefficient for the buoy’s bottom side in high wave height. The factor for the current condition was not found. Butit was supposed to be related to complex factors like a dimension and a shape by buoy’s posture to flow.
Abstract
The difference of mooring tension by type of buoy was investigated in the circulating water channel and the wave tank for deductingthe 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 of0.1〜0.3 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 wasCL-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 hasthe smallest tension value. So it seems that SP buoy is the most effective in the location affected by fast current. CS is predictedto 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 areaand the drag coefficient for the buoy’s bottom side in high wave height. The factor for the current condition was not found. Butit was supposed to be related to complex factors like a dimension and a shape by buoy’s posture to flow.
참고문헌 (14)
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