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유체력을 고려한 3차원 수중압력선체의 진동특성에 관한 연구
손충렬(CHOONG-YUL SON),김경수(KYUNG-SU KIM),변효인(HYO-IN BYUN) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.1
Unlike structures in the air, the vibration analysis of a submerged or floating structure such as offshore structures or ships is possible only when the fluid-structure interaction is understood, as the whole or part of the structure is in contact with water. This paper introduces two methods to find natural frequency in consideration of fluid-structure interaction, direct coupled vibration analysis and fluid-structure modal coupled vibration analysis. The purpose of this study is to analyze the vibration characteristic of a submerged vehicle to obtain the anti-vibration design data, which could be used in the preliminary design stage. The underwater pressure hull of submerged vehicle is used as the model of this study. The F.E.M. model is meshed by shell and beam elements. Also, considering the inner hull weight, the mass element is distributed in the direction of hull length. Numerical calculations are accomplished by using the commercial B.E.M. code. The characteristics of natural frequency, mode shape and frequency-displacement response are analyzed.
부가수질량을 고려한 실린더형 풍력발전기타워의 동적응답연구
손충렬(Son Choong-Yul),이강수(Lee Kang-Su),이정탁(Lee Jung-Tak) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
Unlike structures in the air, the vibration analysis of a submerged or floating structure such as offshore structures is possibly only when the fluid-structures is understood, as the whole or part of the structure is in contact with water. Through the comparison between the experimental result and the finite element analysis result for a simple cylindrical model, it was verified that an added mass effects on the cylindrical structure. Using the commercial FEA program ANSYS(v.11.0), underwater added mass was superposed on the mass matrix of the structure. A frequency response analysis of forced vibration in the frequency considered the dynamic load was also performed. It was proposed to find the several important modes of resonance peak for these fixed cylindrical type structures. Furthermore, it is expected that the analysis method and the data in this study can be applied to a dynamic structural design and dynamic performance evaluation for the ground and marine purpose of power generator by wind.
손충렬(Son, Choong-Yul),이강수(Lee, Kang-Su),류영현(Ryu, Young-Hyun) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.9
In the design of a rotor shaft, care should be taken to minimize vibration by taking into account the sources of vibration. In addition, the intensity critical speed, stability, and other related aspects of the system must be considered. especially when it is operated at a critical speed, it is important to address issues related to vibration, as an increase in the whirling response of the rotor shaft can cause damage to the shaft, destruction of the rotor parts, and detrimental abrasions on the bearings. In this thesis, the vibration characteristics of a rotor shaft are investigated through the use of the finite element method. Variations of the diameters and lengths were used to determine the effect of a rotor shaft using Beam No.188(3D linear strain beam) in ANSYS version 11.0 as a universal interpretation program for finite elements. Special care was taken to prevent excessive vibration, which can result from resonance at the initial stage, in the formulation of a dynamic design for a rotor shaft through calculations while changing the diameters and the lengths of the shaft. Moreover, the dynamic characteristics of the critical speed, total mass, D/L(diameter to length) ratio, and natural frequency were verified. Furthermore, the rotor shaft applied by bearing element was calculated and compared by using Combi No. 214(2-D spring-damper bearing).
LNG 운반선용 펌프타워의 구조해석 GUI개발에 관한 연구
이강수,손충렬,Lee, Kang-Su,Son, Choong-Yul 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.5
본 연구의 목적은 LNG 펌프타워 구조물의 전용 구조해석 GUI를 개발하는데 있다. 이 시스템은 펌프타워 구조물의 유한요소모델을 가장 적절한 형태로 만들어 주며, 가장 적합한 과정을 통하여 해석이 자동으로 수행되도록 해준다. 펌프타워 구조물은 LNG선의 가장 중요한 것 중의 하나이다. 펌프타워 구조물은 주로 카고탱크 안의 LNG가 채워져 있는 양과 선박의 운동에 의한 슬로싱(sloshing) 하중이 주가된다. 그 밖에 하중의 형태는 열, 관성, 자중 등의 세 가지에 대하여도 고려하였다. 이러한 하중들을 범용 유한요소해석 프로그램인 ANSYS에 적용하여 구조해석을 수행하였다. 미국선급협회(ABS) 내의 API Unity check를 통하여 구조부재의 강도 계산과 조인트(Joint)에서의 Punching shear unity 값도 검토하여 그 건전성 여부를 판단할 수 있도록 하였다. 상위의 과정을 새로운 형태의 GUI로 개발하였다. 펌프타워 전용해석 툴(tool)은 Tcl/tk언어로 개발되었다. 위의 모든 과정들이 GUI 성공적으로 적용되었다. The purpose of this study is to develop a structural analysis system of LNG pump tower structure. The system affords to build optimized finite element model and procedure of the pump tower structure. The pump tower structure is one of the most important components of LNG (liquefied natural gas) carriers. The pump tower structure is subject to sloshing load of LNG induced by ship motion depending on filling ratio. Three typer of loading components, which are thermal, inertia and self-gravity are considered in the analysis. The finite element analysis is performed with ANSYS commercial code. The failure of each members can be evaluated of API unity and punching shear in ABS rule. The GUI is newly developed using Tcl/tk script language. All these design and analysis procedures are embedded in to the analysis system successfully.
임프란트 나사형태와 치조골 흡수에 따른 응력분산의 3차원 유한요소법적 분석
김일규,손충렬,장금수,조현영,백민규,박승훈,Kim, Il-Kyu,Son, Choong-Yul,Jang, Keum-Soo,Cho, Hyun-Young,Baek, Min-Kyu,Park, Sheung-Hoon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.1
The objective of this study is to evaluate the stress distribution according to the thread design and the marginal bone loss of a single unit dental implant under the axial and offset-axial loading by three dimensional finite element analysis. The implants used had the diameter of 5mm and 4mm with 13mm in length and prosthesis with a conical type which is 6mm in height and 12mm in diameter. The thread designs were triangular, square and buttress. In the three dimensional finite element model with $15\times15\times20mm$ hexahedron and 2mm cortical thickness, implants were placed with crown to root ratio 7:12, 10:9, 13:6 and 16:3. And additionally the axial force of 100N were applied into 0mm, 2mm and 4mm away from the center of the implants. The results were as follows 1. The maximum von-Mises stress in cortical bone was concentrated to cervical area of implant, and in cancellous bone, apical portion. 2. Comparing the von-Mises stresses in cortical bone of 2mm and 4mm offset loading with central axial loading, it were increased to 3 and 5 times in diameter 4mm implant, and 2 and 4 times, in diameter 5mm implant. 3. The square threads were more effective than the triangular and butress as the longer diameter, the offset loading, and the worse crown to root ratio. 4. The von-Mises stresses were relatively stable until crown to root ratio 13:6, but it was suddenly increased at 16:3. From the results of this study, minimum requirement of crown to root ratio of implant is 2:1, and in the respect of crown to root ratio, diameter and offset loading, square threads are more effective than triangular and buttress threads.
해상 풍력 발전용 Tubular와 Jacket Type Tower의 진동 특성에 관한 연구
이강수,이정탁,손충렬,김건훈,Lee, Kang-Su,Lee, Jung-Tak,Son, Choong-Yul,Kim, Keon-Hoon 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.5
풍력 발전 분야는 앞으로 에너지 대란에 있어서 이를 해결해 줄 중요한 돌파구 중의 하나이다. 지금까지 연구되어 온 풍력발전기의 Tower에 대한 분야는 정적인 해석에 그치고 있다. 본 연구에서는 타워의 형태를 크게 두 가지 Tubular Type와 Jacket Type으로 정하고 이것에 대한 각각의 특성을 파악하며, 그 경향을 찾아내 이를 실제 설계 및 제작에 적용하고자 하였다. 본 논문에서는 타워의 모드별 고유진동수를 파악하고 이것에 대한 특성을 연구하였으며, 작동 중 발생하는 하중과 해상 설치 시 작용하는 부가질량의 영향에 대하여 고려하여 그 특성을 파악하였고 두가지 유형의 타워의 특성을 비교하여 그 경향을 예측 할 수 있었다. Wind power generation is one of the promising gateways that will solve the energy crisis in the future. The wind power generator studied so far is limited to static interpretation in the areas related to tower. This study broadly sets the form of tower as tubular and jacket, identifies the characteristics of each and aims to find and apply their trend to in actual design and manufacturing process. This paper identified the resonance frequency of tower at each mode and studied their features. Furthermore, this study identified the characteristics of the load that occurs in operation and the effect of additional mass incurring when installed in sea, and it compared the two types of tower and was able to predict their trend.
김경수(Kyung-Su Kim),손충렬(Choong-Yul Son),김성준(Sung-Joon Kim) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.2
Two types of barge, container and tanker vessels, are designed with specific dimensions for canal-coastal shipping in Kyung-In canal and Yellow Sea region. The principal dimensions of barges are determined by considering the environment of Kyung-In canal and Yellow Sea. The selection of structure type and strength confirmation is conducted by the technical rules of Korean Register of Shipping.<br/> For the structural analysis of designed barges, the semi-direct structural analysis is carried out with using MSC NASTRAN software. Applying identical dimensions to both vessels, the standardization of structural design and analysis procedure are introduced.
모형실험 및 수치 시뮬레이션을 이용한 쌍동형 준설선의 선형 설계에 관한 연구
이영길(YOUNG-GILL LEE),손충렬(CHOONG-YUL SON),정우철(UH-CHEUL JEONG),강대선(DAE-SUN KANG),정광열(KWANG-LEOL JEONG),김도정(DO-JUNG KIM) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.2
To develope a hull form of catamaran type dredging vessel, resistance characteristics is investigated to find the interaction effect of waves between the two hulls. The fore body shape is simplified as two dimensional wedge shape for the maintenance and disassembly/assembly. Based on MAC method, numerical simulation is performed in staggered variable mesh system. The conservation form of Euler equations and continuity equation are applied as governing equations. To verify numerical methods, the wave patterns along the hull surface are compared with the results of model tests. This study is performed as varying wedge shape of the bow and the distance between the two hulls. The wave interactions between two hulls are observed to investigate the relation between the resistance performance and the flow characteristics. Suitable hull form and distance between two hulls are discussed.