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변성국,곽문수,편종근 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
In this study, Green function method which calculates wave heights in harbor with constant depth is examined and the numerical model using by this method is applied. A computation of numerical model in huge harbor or sea area generally needs a long run-time. Green function method which has an effect of reducing run-time is applied to sea area in Saemankum and verified by comparing the results with those of other numerical model and hydraulic model experiment.
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.
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.
極座標 抛物形 波動方程式에 의한 變水深 点源波의 數値解析
곽문수,편종근 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
The Green function method is widely used for the analysis of waves in a harbor with a constant depth. In extending the application of this method to a wave field over arbitrary depth, a more generalized and convenient method is needed to obtain unit solutions for waves emerging from a point source. For this purpose, a parabolic wave equation is derived to approximate the mild-slope equation written in terms of polar coordinates. Usefulness of the equation obtained is examined through trial computations.
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.
玄鍾輝,金圭漢,片宗根 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
Using the model with a process of the wave energy dissipation, wave height and water level in the surf zone are calculated. We adopted the model to two-dimensional slope bottom. The calculation is performed for the regular and random slope bottom topography. By comparing the calculate results using the wave energy dissipation terms with the experimental results, the validity of the model is verified.
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.
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.