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심도식(Do Sik Shim)(沈度植),이종호(Jong Ho Lee)(李鍾昊) 위기관리 이론과 실천 2013 Crisisonomy Vol.9 No.11
본 연구는 토목섬유 구조체의 해안선 적용성을 알아보기 위한 수리모형실험 및 수치해석적 연구이다. 수리모형실험은 토목섬유 구조체를 설치한 경우와 일반 토목섬유 구조체를 설치하지 않은 경우, 투수성을 개량한 토목섬유 구조체를 설치한 경우 3가지에 대하여 실시하였다. 실험결과 개량된 토목섬유 구조체를 설치한 경우 해안침식 방지효과가 발현되는 것으로 확인되었다. 한편, 토목섬유 구조체의 모래충진시 거동을 알아보기 위한 수치해석 결과 모래충진시 전단응력은 구조체 하부 측면방향으로 집중되었으며 상재하중의 영향으로 구조체 하부에 응력이 증가되는 것으로 분석되었다. 또한 뒷채움지 구조체 배면하부에서 전단응력이 증가하였고 뒷채움 하중의 영향으로 측면만곡부에서 변위증가가 최대로 발생되었다. The objective of this study is to investigate coastal applicability of geotextile through numerical analysis and hydraulic model exeperiment. Hydraulic model exeperiments were conducted in three cases: gexotile installed, normal geotextile installed, and modified geotextile permeability. Test result shows that installation of geotextile has prevention effect for costal erosion. Furthermore, in numerical analysis results to investigate behavior of geotextile in case of sand filing, shear stresses concentrate and increse the lateral direction under the geotextile as effect of overburden load. Also, shear stresses increase under the backface of backfill structure and displacement was occurred the maximum value at the side flexure as influence of backfil load.
심도식(D. S. Shim),양동열(D. Y. Yang),정성욱(S. W. Chung),한명수(M. S. Han) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
For the effective manufacture of doubly curved metal plates, a line array roll set (LARS) process is proposed. The suggested process utilizes a pair of upper and lower symmetric roll assemblies. In the process, the initial plate is progressed into the final shape in a stepwise or pathwise manner according to the basic principle of the incremental forming process. In this work, the intermediate shape which is closest to a final shape is proposed to fabricate the desired shape effectively in design of forming schedule. The intermediate shape has homogeneous curvature in a longitudinal and transverse direction so that it can be fabricated easily without complicated controls of rolls in the roll set. The method of approximation using genetic algorithm is proposed and applied to some actual ship hulls to evaluate the efficiency of the algorithm.
대형 상선 외곡판 제작을 위한 냉간 롤 성형 공정 개발 및 적용
심도식(D. S. Shim),이돈진(D. J. Lee),한명수(M. S. Han),양동열(D. Y. Yang),고명석(M. S. Ko) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Incremental roll forming process combines the advantages both of incremental forming and the roll forming process. This process requires a smaller load capacity to form a thicker plate. This fact means that the incremental roll forming process has considerable potential for shipbuilding applications. The authors of this work have demonstrated experimentally the general applicability of the incremental roll forming process for the manufacture of ship hull plates. Recently, on the basis of the preliminary study, the large-sized forming machine for practical application of incremental roll forming process has been developed. Furthermore, the forming process planning system for the generation of forming information has been constructed and integrated with the forming machine. The primary achievements and features will be presented in this paper.
심도식(D. S. Shim),양동열(D. Y. Yang),정성욱(S. W. Chung),한명수(M. S. Han) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
The line array roll set process, as one of many kinds of incremental forming processes, is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has considerable potential for shipbuilding applications. In a shipbuilding yard, hull forming is an important fabrication process in which flat plates are deformed into singly or doubly curved plates. The major purpose of the present study is to estimate experimentally the general applicability of the line array roll set process for the manufacture of ship hull plates. In this study, the target shapes are selected through investigation of the shape classification of ship hull plates that comprise a certain vessel. Forming processes for twisted shapes are analyzed with the finite element method (FEM). Finally, the results of experimental work for two types of target shapes are presented.