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Tension Leg Platform의 Tether의 동적해석
편종근,박우선,김규한,Pyun, Chong Kun,Park, Woo Sun,Kim, Kuy Han 대한토목학회 1987 대한토목학회논문집 Vol.7 No.4
Dynamic analysis of tethers and platforms of tension leg platforms(TLP's) subjected to wave forces is presented in this paper. The efficient platform analysis model which can adequately include the dynamic characteristics of tethers is proposed, and the platform motion analyses are mainly carried out using this model. Also, the tether analyses are performed utilizing the finite element method with geometric stiffnesses due to the pre-tension in tethers. Two different. TLP's located in 1000 ft and 3000 ft waters are chosen as example structures. For the purpose of comparison, analyses are also carried out by two different models. One is the conventional model in which the tethers are idealized as weightless springs. The other is the coupled model of platform and tethers. A comparison has been made between the results obtained by three different models mentioned above. Also, effects of the conventional stiffnesses of tethers and the wave exciting forces acting on tethers for the tether responses are examined. 본 논문에서는 파랑하중에 대한 Tension Leg Platform(TLP)의 tether와 platform의 동적거동해석에 대해서 연구하였다. tether의 동특성 효과를 적절하고도 간단히 고려할 수 있는 platform 해석모델을 제안하여 platform 운동해석을 수행하였으며, tether에 작용하여 인장력에 기인된 기하학적 강성을 고려한 유한요소법을 사용하여 tether의 거동을 해석하였다. 해석 예제용구조물로는 설치수심이 1000ft 및 3000ft인 두 가상적인 TLP를 선택하였으며, 비교를 목적으로 tether의 동특성 효과를 고려하지 않은 기존모델 및 platform과 tether를 조합한 모델 등에 의한 해석도 수행하여, 그 결과를 본 연구에서 제안한 모델에 의한 platform 운동과 tether의 거동 해석결과와 비교분석하였다. 아울러, tether의 통상적인 휨강성 및 tether에 작용하는 파랑하중이 tether의 거동에 미치는 영향정도도 고찰하였다.
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TOPOGRAPHIC CHANGES AROUND THE LAGOON YOUNGRANG
편종근,김규한,Seung Jin Jung 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.2 No.1
Topographical changes around the inlet of lagoon causing sedimentation have begun to directly affect the water quality in the lagoon. This major environmental issue has attracted much social attention in Korea. Topographical changes around the inlet of lagoon show the extremely complex features of waves, wave induced currents, and interaction of seawater and freshwater. This study aims to introduce a special methods for dealing with waves, wave induced currents and Topographical changes, which are among the major factors of various hydraulic phenomena in the lagoon area. Also, this study deals with the effectiveness of the jetty system and the optimal conditions for installing the jetty system which is often suggested as an alternative measure to prevent the closure of river mouth.
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Morison 방정식을 이용한 Tension Leg Platform의 동정해석
편종근,박우선,윤정방,Pyun, Chong Kun,Park, Woo Sun,Yun, Chung Bang 대한토목학회 1987 대한토목학회논문집 Vol.7 No.3
본 논문에서는 Tension Leg Platform(TLP)에 작용하는 파랑하중을 간단한 Morison 방정식을 이용하여 효율적으로 산정할 수 있는 방법에 대해서 연구하였다. 본 방법에서는 MacCamy-Fuchs 산란파이론에 기초를 둔 파동력 감소계수를 도입하여 파의 산란효과를 근사적으로 고려하였으며, Morison 방정식 상에서는 무시되는 연직기둥의 바닥에 작용하는 수직력을 이 면에서의 동압력과 수직방향의 부가질량에 관련된 관성력으로 산정하여 고려하였다. 수치해석은 1000 ft 수심에 위치한 가상적인 구조물에 $0^{\circ}$ 및 $45^{\circ}$로 입사하는 파에 대하여 전술한 방법 및 이론적으로 보다 정확한 산란파이론에 의한 방법을 사용하여 수행하였으며, TLP 운동 및 tether의 상단 인장력의 전달함수(RAO)를 구하여 비교 검토하였다. An efficient method for the calculation of wave forces on a tension leg platform(TLP) is presented in this paper. It is based on the Morison's equation with two corrective terms. One is the reduction of the inertia forces on the vertical columns in order to include the wave diffraction effect particularly for small wave conditions. The other is the inclusion of the hydrodynamic forces acting at the bottoms of the columns. Numerical studies are carried out for a TLP in 1000 ft water with two different wave heading angles($0^{\circ}$ and $45^{\circ}$). The reponse amplitude operators(RAO's) for the TLP motions and top tether tension variations are obtained by the present method and the theoretically more accurate method based on the diffraction theory. A comparison has been made between the results obtained by two methods.
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연직축대칭(鉛直軸對稱) 부유체(浮遊體)의 동적응답(動的應答)
편종근,Pyun, Chong Kun 대한토목학회 1984 대한토목학회논문집 Vol.4 No.1
연직축대칭(鉛直軸對稱) 부유체(浮遊體)의 동적응답(動的應答)을 Fenton의 계수행렬(係數行列)을 수정(修正)하여 구(求)하여 보았다. 축대칭(軸對稱) 관계로 계산시간(計算時間)을 대폭(大幅) 줄일 수 있었으며 Hoffman의 Discus Buoy에 대한 모형실험치(模型實驗値)와 비교(比較)하였다. 앞으로 Tension Leg Platform등과 같은 대수심(大水深) 대형(大型) 구조물(構造物)의 동적응답(動的應答)을 계산(計算)하기 위한 초석(礎石)이 될 것이다. The dynamic response of vertically axisymmetric floating bodies is numerically calculated with corrections of Fenton's coefficient matrix. The computational effort required is considerably reduced due to axisymmetry of the bodies. Comparisons are made with the results of Hoffman's model tests of the discus buoy. In the near future, this study will be applied to calculate the dynamic response of large scale structures, located in the deep sea, i.e., tension leg platforms.
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片宗根 명지대학교 1976 明大論文集 Vol.9 No.-
In case of diffraction from semi-infinite breakwater when waves propagate to breakwater at right angle, Penney and Price's solution has been well known and programmed so as to make diffraction diagrams. This paper presents another approach whcih is based on the finite element method.
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편종근 명지대학교 공학기술연구소 1986 공학기술연구소 논문집 Vol.1 No.-
Stimulated by Strang G., a sample problem and various hand-calculated solutions are introduced in order to have a bird's-eye-view of solution methods. A sample problem is governed by famous Laplace equation with the Dirichlet boundary conditions and numerical solutions, using the finite difference method, the finite element method and the boundary element method alternatively, are presented and compared with the analytical solution and with one another. The numerical solutions are as accurate as the level that hand calculation is possible, because, if not, students can hardly understand the whole procedure, making the final matrix and solving it. A straight forward extension of these fundamental ideas leads to the more complicated problems.
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Re-derivation of Added Mass Coefficient of Circular Cylinder near Bottom Boundary
편종근,박창근 한국해안해양공학회 1994 한국해안해양공학회 논문집 Vol.6 No.3
바닥영향을 받는 수평원형 실린더에 작용하는 힘에 대한 해석해를 복소포텐셜을 이용하여 재유도하였다. 본 연구에서 해석해를 재유도한 이유는 Yamamoto 등(1974)이 유도한 해석해는 부가질량제수가 거동하는 경향을 정확하게 설명하지 못하고있기 때문이다. 재유도한 부가질량계수 CM은 Yamamoto 등(1974)의 <sup>M</sup> 과 다르며, 또한 부가질랑계수가 거동하는 경향을 만족하게 설명하고 있음을 알 수 있었다. The analytic solution of the forces acting on a horizontal circular cylinder affected by the bottom boundary is re-derived using the complex potential. The reason of the re-derivation of the analytic solution is such that it is found that the analytic solution of Yamamoto et al. (1974) does not simulate the behavior of the added mass coefficient accurately. The re-derived formula of the added mass coefficient CD is different from that of Yamamoto et al (1974), while the re-derived formula of Cm simulates the tendency of the behavior of the added mass coefficient success-fully.
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