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최대 내용적을 갖는 수소압력용기의 형상설계 및 성형해석
박건영(Gun Young Park),곽효서(Hyo Seo Kwak),이광오(Kwang O Lee),김철(Chul Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.10
최근 화석연료 고갈 및 환경오염 문제를 해결할 수 있는 대안으로 수소에너지가 주목받고 있으며, 고효율 및 주행거리 향상을 위한 수소 자동차 개발에 따라 수소 저장 압력용기의 내용적 증가 및 구조안전성이 요구되고 있다. 그러나, 반구형의 바닥부보다 내용적이 큰 타원형 바닥부의 형상설계가 이루어지지 않았으며, 타원형 바닥부의 성형공정에 관한 연구 또한 미비한 실정이다. 이에 본 연구에서는 수소압력용기 라이너의 타원형 바닥부 장단축비에 따른 최대 내용적을 계산하고 유한요소해석을 통한 구조안전성 검증 및 이에 대한 이론적 고찰을 검토하였다. 또한, 바닥부 성형 공정해석을 통하여 제안된 최대 내용적을 갖는 타원형상의 성형 가능성을 확보하였다. Recently, hydrogen energy has been in the spotlight as an alternative to diminishing fossil fuels and as a potential solution to environmental pollution. The development of hydrogen-fueled vehicles and the demands for improved fuel efficiencies have resulted in the need to increase the volume of the hydrogen pressure vessels. Pressure vessels having an elliptical bottom, as opposed to one that is hemispherical, allow for a greater capacity. However, there are insufficient studies on the feasibility of the forming process required for an elliptical bottom. In this study, the liner capacity is calculated according to the ratios of the major to the minor axes of the elliptical bottom part in a hydrogen pressure vessel. Structural safety is verified through finite element analyses, and the results are compared to the theoretical results. The feasibility of the proposed elliptical shape of the pressure vessel bottom, while filled to maximum capacity, is validated through forming analysis.
Type I 고압 수소용 용기(990 bar) 제조를 위한 열간 스피닝 공정의 유한요소 해석
서영빈(Young-Bin Seo),박건영(Gun-Young Park),김한빈(Han-Bin Kim),김철(Chul Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The dome part of hydrogen pressure vessel (Type I) is manufactured by hot spinning process. Since the study on the spinning process of hydrogen pressure vessel with thick thickness is insufficient, it is necessary to analyze the defects occurred during the spinning process and to derive the design parameter for optimal design. In this study, FEA of the spinning process for dome part of the hydrogen pressure vessel (Type I) which thickness is 40 to 50 mm was carried out and the number of paths of roller for forming of dorm was decided except for inlet part. In addition, defect in forming occurred during simulation is analyzed and, its causes and countermeasures are reviewed.
압력맥동 및 소음 저감을 위한 2개의 확장된 오보이드 로브형상을 갖는 지로터 치형 설계
신찬영(Chan-young Shin),박건영(Gun Yung Park),김철(Chul Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The Gerotor oil pump has a simple structure and has a larger discharge per revolution than other pumps of the same size, so it is advantageous for miniaturization and widely used. To improve fuel efficiency and reduce noise, which are the most important issues in the automobile industry, the tooth design of the Gerotor oil pump is still required. In this study, two extended ovoid curves were applied to the method previously devised for lobe shape design in previous study.