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횡파 중 대경사에 따른 소형어선의 동요응답 특성에 관한 연구
박노식(Ro-Sik Park),김성근(Seong-Gun Kim),이진복(Jin-Bok Lee) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.6
This study conducted wide-tank experiments and numerical calculations for a vessel in various positions such as upright and inclined by 2 and 4 degrees, with the goal of investigating the motion amplitude response of a small damaged fishing boat subject to a beam sea. Numerical calculations were conducted based on the three-dimensional source distribution method. The good agreement of the numerical calculation and experimental results confirmed that the present calculation method can be efficiently used for the initial design of a small fishing boat. In addition, while the chine-line type has been frequently adopted to improve a ship’s resistance performance in the design of a small fishing boat, it is considered that the possibility of a deterioration in rolling performance should be thoroughly considered.
박노식(Ro-Sik Park),이진복(Jin-Bok Lee) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
The marine accident case the last 5 years, a small vessel of less than 20tons of incidence of accidents accounted for 33.2%, most these vessels were composed of small fishing vessels. in addition most of ship capsized occurred by excessive roll motion. In this paper, Now widely used in domestic gross tonnage of 1 ton and 3 ton based on the linear fluctuations of small fishing vessels to development of new type for motion of response and stability. It used to Three-dimensional source distribution method find out hydrodynamic force and moition of response for even keel and heeling state. As a result, In the development of small fishing boats knuckle line resistance characteristics influence the decision a lot but does not significantly affect of the motion characteristics.
박노식(Ro-Sik Park),엄병섭(Byung-Seob Eom) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.1
This study is carried out the theoretical studies on wave transmission and motions in waves of twin hull type floating breakwaters with the vertical and horizontal plate.<br/> The method of calculation is based on the three dimensional singularity distribution method.<br/> The results show that wave transmission is affected by heave motion.<br/> Twin hull type is designed by the use of the theoretical method and good performance of the developed floating breakwater is confirmed for longer wave period.
박노식(Park ro sik) 한국해양공학회 1994 韓國海洋工學會誌 Vol.8 No.2
This paper compared with the hydrodynamic interference acting on the semi-submersible element model with 1-lowerhull and 2-columns. In this case, calculation are applying the strip method and 3-dimensional source distribution method. As the wave frequency and the distance between increase, the influence effects of parts upon each other decrease and approach the results calculated by using the strip method. Thus, it can be prepared for the investigation of new practical method of investigation of new practical method of hydrodynamic forces acting on huge structures.
초대형 부유식 해양구조물에 작용하는 유체력 추정에 관한 근사계산법의 연구
박노식(Ro-Sik Park) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.1
This study is to develop a practical calculation method of hydrodynamic forces and motion response on very large floating structures consisted of multiple legs. To investigate the effect of hydrodynamic interaction and of free surface on the responses of very large floating structures in regular waves, four kind of models are considered, ie. 1, 4, 64, 21248 column with footing. Based upon the results of this study, it is found that the middle parts of very large floating structures have small diffraction effects. Therefore only out side parts are used to determine the hydrodynamic forces for taking into account the effects of interaction.
조선 해양 구조물용 강재의 소성 및 파단 특성 IV: 고온 기계적 물성치에 관한 실험적 연구
정준모,임성우,박노식,Choung, Joon-Mo,Im, Sung-Woo,Park, Ro-Sik 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.3
This is the fourth of a series of companion papers dealing with the mechanical property reductions of various marine structural steels. Even though a reduction of the elastic modulus according to temperature increases has not been obtained from experiments, high temperature experiments from room temperature to $900^{\circ}C$ revealed that initial the yield strength and tensile strength are both seriously degraded. The mechanical properties obtained from high temperature experiments are compared with those from EC3 (Eurocode 3). It is found that the high temperature test results generally comply with the prediction values by EC3. Based on the prediction of EC3, time domain nonlinear finite element analyses were carried out for a blast wall installed on a real FPSO. After applying the reduced mechanical properties, corresponding to $600^{\circ}C$ to the FE model of the blast wall, more than three times the deflections were observed and it was observed that most structural parts experience plastic deformations exceeding the reduced yield strength at the high temperature. It is noted that a protection facility such as PFP (passive fire protection) should be required for structures likely to be directly exposed to fire and explosion accident.
김성근(Seoung-gun Kim),박노식(Ro-sik Park),박인규(In-gyu Park) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.2
The theory is based on two thermodynamic equations for the air mass in the air column and hydrodynamic equation for the relation between the response of the air in the water column and the incident wave. The numerical model is experimented in a two dimensional water tank and the caisson model with sloped front wall is tested in the large towing tank.
조철희(Chul-Hee Jo),박노식(Ro-Sik Park),임진영(Jin-Young Yim),이강희(Kang-Hee Lee) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.4
The use of a tidal-current power system is one source of renewable energy that can minimize the environmental impact of power production and offer many other advantages compared to conventional energy sources. Unlike other energy production approaches, rate of energy production can be precisely predicted and the operational rate is very high. The performance of the rotor, which has a vital role in energy production using tidal currents, is determined by various design factors, and it should be optimized for the specific ocean environment in the field. The horizontal-axis turbine is very sensitive to the direction of flow and flaw direction changes due to rise and fall of the tides. To investigate the performance of the rotor considering the interaction problems with incidence angle of flaw, a series of experiments were conducted, and a 3D CFD model was designed and analyzed by ANSYS CFX. The results and findings are summarized in the paper.
임성우(SUNG-WOO IM),조철희(CHUL-HEE JO),박관규(KWAN-KYU PARK),박노식(RO-SIK PARK),조원철(WON-CHUL CHO) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.6
Large-scale model tests of welded topside joints were carried out to observe the fatigue behavior of API 2W Gr.50 steel produced by POSCO. The fatigue crack behaviors for various loading conditions were measured and investigated around the critical joint sections. The experimental results have been verified with numerical approaches and also compared with the AWS D1.1 and DnV RP-C203 design curves. The large-scale experiment models were fabricated, based on the actual operating east area fixed platform. The dimensions of the models were slightly modified to accommodate the test facilities and capacities. The fatigue test was carried out having △Q of T1=705.6kN, T2=749.7kN and T3=793.8kN. The three specimens were statically loaded 20 times, with various loadings of about 50kN intervalsbetween the maximum and minimum loads required in the fatigue tests. This loading removed the residual stress in the specimen before the fatigue tests. The topside joint crack was initiated from the brace heel, where the maximum tensile stress occurred. The API 2W Gr.50 steel satisfied the AWS D1.1 detail category C and DnV RP-C203 detail category F ΔS-N curve.