부 타이어 소파제의 정적 장력 해석 방법

윤길수,추원효,YOON Gil-Su,CHU Weon-Hyo 한국수산과학회 1993 한국수산과학회지 Vol.26 No.1

This paper deals with static tension analysis method for Floating Tire Breakwater(FTB). FTB can be used for the limited wave height. It is especially focused on Goodyear type FTB easily applied to the breakwater for the fisheries cultivating region. The numerical examples for FTB design procedure was reviewed. It is also studied the static analysis method of offshore catenary spread mooring system. The general calculation procedure for the tension versus excursion curves for the multi-line system using the basic catenary relationship was studied. Calculation results showed good agreement with some existing mooring results. To extend this mooring force calculating method to the floating fisheries caitivating cages, the strength of synthetic fiber was considered. This analysis method can be used to the estimation of the mooring force for the floating structures such as floating breakwaters and floating artificial reefs.

부유식 해상관측시설의 파랑중 운동 및 표류력 해석

윤길수,김용직,김동준,강신영,YOON Gil Su,KIM Yong Jig,KIM Dong Jun,KANG Shin Young 한국수산과학회 1998 한국수산과학회지 Vol.31 No.2

본 연구에서는 부유식 해상관측시설의 파랑중 운동응답 및 표류력 해석을 위해 Green 적분방정식에 기초한 3차원 수치해법을 개발하였다. 본 방법에서는 소오스분포와 더브렛분포를 함께 사용하였으며, 판요소로는 3각형 요소와 4각형 요소를 병행 사용하였다. 불규칙파수 현상을 제거하기 위해 개량된 적분방정식 해법을 적용하였으며, 시간평균 표류력의 계산은 원인별 성분파악이 가능한 물체표면 직접적분법을 사용하였다. 개발된 전산 프로그램의 검증을 위해 비교자료가 있는 구형 부유체에 대한 계산이 수행되었고, 이에 대한 계산을 통해 개발된 프로그램으로부터 신뢰성있는 결과를 얻을 수 있음을 확인하였다. 실제시설에 대한 적용예로서 직경 2.6m 흘수 3.77m인 원통형 해상관측용 부이에 대한 계산을 수행하여 그 운동특성 및 표류력 특성을 고찰하였다. 운동응답 해석결과는 공진주파수를 설치해역의 파랑 탁월주파수 범위밖에 놓이도록 부이의 형상과 치수를 조정하는데 활용할 수 있고, 또 이들 계산을 통해 댐퍼 등의 설치효과도 미리 예측할 수 있다. 또한, 계산된 표류력은 황천중에서 계류계에 걸리는 최대하중을 예측하는데 이용할 수 있으므로 계류계의 설계에 있어 중요한 기초자료로 활용된다. 본 수치해법은 원칙적으로 대상 부유체의 형상에 제약을 받지 않으므로 향후 다양한 형상의 부유식 해상관측 시설들의 설계 및 설치$\cdot$운용에 폭 넓게 적용할 수 있다. A three-dimensional numerical method based on the Green's integral equation is developed to predict the motion response and drift force in waves for the ocean monitoring facilities. In this method, we use source and doublet distribution, and triangular and rectangular eliments. To eliminate the irregular frequency phenomenon, the method of improved integral equation is applied and the time-mean drift force is calculated by the method of direct pressure integration over the body surface. To conform the validity of the present numerical method, some calculations for the floating sphere are performed and it is shown that the present method provides sufficiently reliable results. As a calculation example for the real facilities, the motion response and the drift force of the vertical cylinder type ocean monitoring buoy with 2.6 m diameter and 3,77 m draft are calculated and discussed. The obtained results of motion response can be used to determine the shape and dimension of the buoy to reduce the motion response, and other data such as the effect of motion reduction due to a damper can be predictable through these motion calculations. Also, the calculation results of drift force can be used in the design procedure of mooring system to predict the maximum wave load acting on the mooring system. The present method has, in principle, no restriction in the application to the arbitrary shape facilities. So, this method can be a robust tool for the design, installation, and operation of various kinds of the floating-type ocean monitoring facilities.

콘크리트 파일앵커의 설치 매니퓨레이터의 개발을 위한 모형실험에 관한 연구

윤길수(GIL-SU YOON),김호상(HO-SANG KIM) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.1

Greater holding force of an anchor is required for maintaining the position of a larger floating structure. According to the series of model tests of pile anchors with movable fluke, the square type pile anchor, with fluke, showed more than 6 times of the uplift pulling force, compared to the same type pile anchor, without fluke. This uplift force is 100 times its weight. When the water depth is more than 40 m, it is difficult to install the pile anchor. For a convenient installation method, a type of manipulator is proposed for the separation of a weight and buoyancy controller, using TRIZ.

해상관측시설을 위한 파랑하중과 계류계 해석

윤길수(Gil Su Yoon),김용직(Yong Jig Kim),김동준(Dong Joon Kim),강신영(Sin Young Kang) 한국해양환경·에너지학회 1998 한국해양환경·에너지학회지 Vol.1 No.1

역학 문제 풀이 도구로서의 SureMath 활용방법

윤길수(Gil Su Yoon) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6

Mathematics is the basic for learning advanced subjects such as Algebra, Physics, Chemistry, Machanics etc. from grade school to graduate school and beyond. To solve mathematical problems especially mechanics is not easy for ordinary students, so it is liable for students to give up mathematics in high schools and don't want to be engineers. Since IMF, Korea ship building industry decreases the share of order confronted with China's aggressive pursuit. More than worse is the diminishment of students for majoring of engineering, especially in the fields of naval architects and ocean engineering. It is originated from chasing for easy and comfort life for making money without difficult labors. SurerMath is quite a good supporting program for solving mathematics and machanics problems. To give strong motivation for majoring naval architects and ocean engineering with the training of solving for machanics problems, training tool such as SureMath can give us one measure for heuristic study for our younger generation.

비선형 구조해석에서 부분구조를 이용한 수정 BFGS법

류연선(Yeon-Sun Ryu),윤길수(Gil-Su Yoon) 대한조선학회 1986 大韓造船學會誌 Vol.23 No.3

OWC 플랜트 주위 파랑변형

김용직(Yong-Jig Kim),김동준(Dong-Joon Kim),윤길수(Gil-Su Yoon),류청로(Cheong-Ro Ryu),홍석원(Seok-Won Hong) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.2

Wave deformation due to Oscillating water column (OWC) plant was studied. To solve this problem, three dimensional numerical method based on Improved Green integral equation was applied. Moored condition was considered as well as fixed condition and freely floating condition. From the calculation results, main characteristics of wave deformation due to OWC plant were discussed. Also, some calculations for the floating barge were performed to confirm the validity of numerical solution of the method.

半潛水式 海洋構造物의 波力推定

尹吉秀 釜山水産大學校 1984 釜山水産大學 硏究報告 Vol.24 No.1

계산하기가 비교적 어렵고, 정시간을 요하는 반잠수 해상구조물에 미치는 波力을 Hooft의 근시방법을 이용하여 계산하였다. 본 계산방법에 의하면 간단한 계산만으로도 波기진력 추정이 가능할 뿐만 아니라 소요되는 계산시간이 짧은데 비해 계산 결과도 실험치와 잘 일치하고 있다. 다라서 초기 설계 단계의 해양구조물의 波기진력 계산에 이용할 수 있으며, 운동계산에의 이용도 가능할 것이다. 더구나 본 계산은 Apple CP/M fortran으로 작성, 수행되었음을 밝힌다. 아울러, 대형전산조직의 사용을 절감시킬 수 있을 것으로 기대된다. This paper presents an approximation method for wave force on semi-submersible platforms. The approximate values for 2-D circular cylinder added masses and calculation method was made use of the Hooft's works. The procedure was computerized and varified with the STAFLO platform. The calculation results were compared with the experimental data of NSMB and showed nearly same values.

繫留된 雙胴船의 運動解析

尹吉秀 釜山水産大學校 1989 釜山水産大學 硏究報告 Vol.29 No.1-2

According to increasing need of ocean development, it is necessary for the dynamic analytical method of moored floating bodies. The 2-D problem of moored floating objects was solved numerically as a boundary value problem by direct use of Green's identity formula for a potential function by Ijima et al. They treated floating bodies having mono-hull with taut mooring system for shallow water. In this paper, Ijima's method was extended to catamaran with catenary mooring system for deep water. The dynamic characteristics of catamaran with catenary mooring system showed good agreement with Simada's result. v

부유체 운동해석을 위한 개인용 전산기의 이용방법

윤길수,김동준 釜山水産大學校 1985 釜山水産大學 硏究報告 Vol.25 No.2

본 연구의 결과를 요약하면 다음과 같다. 1. 복소수를 포함하는 선형연립방정식을 푸는 한 방법으로서 부분행렬과 Choleski의 직접해법을 이용한 새로운 프로그람을 작성하였다. 2. 복소수가 정의되지 않는 개인용 전산기에서도 복소수를 포함한 선행연립방정식을 풀 수 있다. 3. 부유체의 운동해석 과정 중에서 2차원 유체력을 구하는 부분에 본 계산방법을 이용할 경우 기억공간이나 계산시간이 줄어들게 된다. 4. 부유체의 운동방정식의 해법에 본 계산방법을 이용할 경우 계산과정이 간단해지게 된다. 5. 본 계산방법은 Gauss 소거법과 비교할 때 기억공간이나 계산시간이 적게 요구된다. This paper presents an application method of personal computer for the motion analysis of Floating Bodies. For the solution of linear equations with complex coefficients, a new computational procedure is formulated and programmed using partitioning and Choleski decomposition. The method is implemented in the personal computer which can not define complex variables. From the case study, it is found that the method is efficient in the motion analysis of floating bodies, especially in the calculation of 2nd hydrodynamic coefficients. Comparison with the Gauss elimination method shows that the proposed new method requires small memory size less computing time.