# 제주대학교 Repository

### 돛이 소형선박의 횡동요에 미치는 영향

Alternative Title
The Influence of Sail on the Rolling motion of Small ship
Abstract
In this paper, to examine the efficiency of the diminution of rolling of a vessel, we installed the proposed sail on a skiff boat, which is a support vessel to 'ARA', Cheju National University's training ship. Eventually we summarize the analyzed results obtained from the vessel while stationary and while in sailing for two cases, the vessel with a sail and the vessel without a sail. The sea trial test was done in cheju outer harbor.

1. The average angle of rolling is 1.74˚ and 1.84˚ each case in first test. Second case 1.09˚ and 1.15˚ respectively. The significant angle of rolling (Φ1/3) is 3.25˚ and 3.42˚ each trial case in first test. Second case 2.04˚ and 2.18˚ respectively. From above the result, in each case rolling angle and significant rolling angle is larger when the ship has not the sail.

2. When the ship is cruising, the average angle of rolling is 1.99˚ (case 1) and 2.17˚ (case 2) in the first field test. In the second field test, the average angle of rolling is 1.06˚ and 1.17˚ for each case respectively. The significant angle of rolling is 3.78˚ (case 1) and 4.11˚ (case 2) in each case of the first field test. In the second field test, the significant angle of rolling is 1.99˚ (case 1) and 2.20˚ (case 2) for each case. This case shows the same tendency exhibited by a stationary ship.

3. The area of Rayleigh's probability density function is larger than 0.011 and 0.019 in the first test and larger than 0.012 and 0.034 in the second case without sail while cruising and while stationary. So, if the wave is high the area will increase.

4. In this case we consider a stationary skiff boat with sail; the efficiency of diminution is 4.57% and 4.07% in the stationary ship in each sea trial test. When the ship is cruising, the efficiency of diminution is 6.97% and 8.12% in each case. Consequently, the efficiency of diminution is higher when the ship is cruising.

5. While cruising, a ship with sail averages a speed of 5.46 knots and a ship without sail average a speed of 5.38knots. In this case, the ship with sail is faster by 0.08knots than without sail.

From above the result, the designed sail can act on diminution of rolling of ship on the irregular wave. If the sail is made of a controllable shape, the sail can control drag and lift. So this sail can use green-energy.
Based on this research, we can design a small ship with an inexpensive anti-rolling system and bring about a reduction in oil consumption. This designed sail combined with the sea anchor used on hand-line fishing boat can be useful while maintaining course.
Author(s)
Issued Date
2008
Awarded Date
2008. 8
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000004404
Alternative Author(s)
Department
Ⅰ. 서 론 1
Ⅱ. 돛을 이용한 횡요감요의 이론 4
Ⅲ. 장치 및 방법 11
3.1 시험선 선정 11
3.2 돛의 제원 및 설치 13
3.3 시험선의 횡동요 경사각 측정 장치 15
3.4 측정방법 및 분석방법 19
Ⅳ. 결과 및 고찰 21
4.1 시험선의 횡동요 경사각 변화 21
4.2 Rayleigh 확률밀도함수 분석 29
4.3 상대누적분포에 의한 감쇠효율 분석 33
4.4 선속의 평균값 비교 39
Ⅵ. 요약 42
참고문헌 44
감사의 글 46
Degree
Master
Publisher
제주대학교 산업대학원
Citation
김상범. (2008). 돛이 소형선박의 횡동요에 미치는 영향
Appears in Collections:
Graduate School of Industry > Fishery