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해양 시추선용 경량 수밀 공조 덕트의 구조해석 및 강도 평가
김병탁(Byung-Tak Kim),진도훈(Do-Hun Chin) 한국동력기계공학회 2024 동력시스템공학회지 Vol.28 No.2
본 연구에서는 새롭게 개발하고자 하는 경량 수밀용 공조 덕트가 7 bar의 내압이나 외압을 받을 경우에 대한 구조해석을 수행하고 그 강도를 평가하였다. 해당 덕트는 해양 시추선용으로 두께 3 ㎜의 STS316L 소재로 되어 있으며, 굽힘에 대한 유연성을 확보하기 위해 길이 방향으로 일정 간격의 주름부가 형성되어 있다. 공조 덕트가 내, 외압을 받을 때 발생하는 응력은 주름부의 피치나 깊이와 같은 설계 인자에 의해 상당한 영향을 받으므로, 본 해석에서는 주름부에 발생하는 응력분포의 양상과 설계인자에 따른 응력 수준의 변화를 조사하였다. 마지막으로 시추선이 침몰하여 덕트가 외압을 받게 되면 쭈그러짐으로 인해 내부 체적이 감소하여 부력 확보가 어려워질 수 있으므로, 이에 대한 안전성을 검토하기 위하여 좌굴 해석도 동시에 수행하였다. 결과적으로 최대응력은 69~70 ㎫로서 항복에 대해 충분한 강도를 가지며, 1차 좌굴 모드에 대한 안전율은 약 1.35로 나타났다. The purpose of this study is to conduct a structural analysis and evaluate the strength of the newly developed lightweight watertight air conditioning duct when it is subjected to seven bar of internal or external pressure. The duct is made of STS316L material with a thickness of three mm for offshore drilling ships and has corrugated parts at regular intervals in the longitudinal direction to ensure bending flexibility. Since the stress generated in which the air conditioning duct is subjected to internal or external pressure is considerably influenced by design factors such as the pitch and depth of the corrugations, this paper focused on investigating the pattern of stress distribution in the corrugated portion and how stress levels changed according to variations in design factors. Finally, the internal volume may decrease due to crumpling, hindering the ability to maintain buoyancy if the drilling ship sinks and the duct is subjected to external pressure. Thus, the buckling analysis was also performed to examine its safety. As a result, the maximum stress was 69-70 ㎫, which had sufficient strength against yield, and the safety factor for the first buckling mode was approximately 1.35.
스웨이징 행정에 따른 고압호스의 변형 특성에 관한 연구
김병탁(BYUNG-TAK KIM),김형제(HYUNG-JE KIM) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.4
The mechanical components with high-pressure hoses are generally produced by the swaging process. The hoses are composed of the rubber materials and the reinforced braids to support tensile forces. In case they are subjected to high mechanical and thermal loads under severe operating conditions, the oil in hoses can leak at the parts of small clamping forces. In this paper, the deformation characteristics of a fiber-reinforced hose are analyzed with respect to the jaw strokes using the finite element method. The manufacturing process is modeled with a contact problem in consideration of a real situation, and the material properties based on the experimental results are used in the analysis. Examinations of the relationship between the swaging strokes and the deformation behaviors of the hose were made on the basis of the stress and strain values of the hose components. The relations between clamping forces and separating forces are also proposed, in order to estimate clamping forces corresponding to separating forces for the given model.
김병탁(Byung-Tak Kim),고성위(Sung-Wi Koh),김광희(Kwang-Heui Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
Blast walls are integral structures at the typical offshore topside module to provide safety barriers for personnel and critical equipment against any blast loading and hydrocarbon explosions. The blast wall structures are usually configured with stainless steel. It can be referred as the good mechanical properties of the stainless steel against blast load, which features the characteristics of significant energy absorption and ductility. In this study, the proposed designs of corrugated panel are examined in order to determine the best design which satisfies the design criteria. The criteria on maximum deflection and stress are used to decide the best design. The effect of inclined angle of profile on deformation characteristics of blast wall is also performed. The numerical study was performed by using NX Nastran 7.5.