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정종윤 ( Jong-yun Jung ),김준섭 ( Joon-seob Kim ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.4
Process driving turbines have been used for a long time in high-temperature and high-pressure environments and are placed in poor environmental conditions, so the stability of the design to prevent deformation or damage is very important. The retainer, which is a core part of the turbine, rotates under steam pressure of high temperature and high pressure, so safety against deformation and damage due to vibration must be ensured. Therefore, safety verification after design is an essential process in turbine design. The purpose of this study is to verify the stability of the process retainer design by finite element analysis. There may be several methods for verifying the stability of a machine, but as machine parts become more complex and diversified, the finite element method is increasingly used. For stability verification, after verifying the deformation and damage of the part by static analysis, the possibility of fatigue failure was checked through the fatigue safety factor and fatigue life through fatigue analysis. In order to verify the safety of the rotating retainer, the possibility of occurrence of resonance according to the natural frequency was confirmed, and total deformation was confirmed through a harmonic response. Through this series of processes, it was verified that the designed retainer, the subject of this research, is safe.
도시형자기부상열차 고유용품 형식승인을 위한 대상 설정에 관한 연구
김상헌(Sang-Hun Kim),박진규(Jin-Kyu Park),김준섭(Joon-Seob Kim),홍건영(Gun-Young Hong) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5
“도시형자기부상열차 실용화 사업”에 의해 도시형자기부상열차의 개발과 시범노선이 건설되어 개통을 앞두고 있다. 도시형자기부상열차가 도시철도로서 시장에 도입되기 위해서는 열차의 성능 및 기능에 대한 객관적이고 신뢰성 있는 기준이 정립되어야 한다. 이에 따라 현행 법령체계에 부합한 도시형자기부상열차 용품 기술기준 및 시험규격이 마련되어야 할 필요성이 제기되었다. 본 연구에서는 도시형자기부상열차 고유용품의 기술기준 및 시험규격을 개발하기 위하여 자기부상열차 성능, 사양, 시험규격 관련 자료를 조사, 분석하였으며 이를 바탕으로 대상용품 선정 기준을 설정하고 기술자문 등을 실시하여 고유용품 대상 설정 결과를 도출하였다. Test line with the development of urban maglev was built by the "urban maglev program", ahead of the opening. For the introduction of the urban maglev into the market as a city railway, high standards of reliability objective must be established for the performance and features of the train. Need to be provided the test standards and technical standards of urban maglev products. As the result, conforming to the laws and regulations of the current system were raised. In this study, investigate the performance of the urban maglev, specifications and test standards related article analyzed to develop the test standards and technical standards of urban maglev specific products, the selection criteria of target products based on this set, and to provide advice, such as technical, derived its own products, the target selection result.
차세대 초고온 가스터빈의 가변 충돌 및 이중벽냉각 구조 최적화 기술과 3D printer/정밀 가공의 융합 제조 기술 개발
권화빈(Hwabhin Kwon),최제문(Jaemun Choi),김준섭(Joon Seob Kim),정예림(Ye Lim Jung),박희성(Heesung Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.05
A complex cooling structure is applied to protect the high-temperature components of the next-generation gas turbine, and a single crystal precision casting method is applied to manufacture it. The single crystal casting method has the disadvantage that the process is complicated and the manufacturing time is long. To compensate for this, a study was conducted to apply a 3D printer and precision processing technology in combination. The double-wall cooling structure applied to the single-stage vane was optimized through numerical simulation studies, and this was verified through experiments. The effusion angles of film cooling and impingement cooling applied to the double wall cooling structure are designed to be 35 ˚ and 90 ˚, respectively. A wind tunnel test was performed to experimentally determine the film cooling performance. In order to increase the film cooling performance, the structure of the delta wing tip and delta wing flop is applied. Heat transfer characteristics and cooling performance are analyzed using a thermal imaging camera and flow visualization technology. Through the development of a process the combines 3D printer and precision processing, the single-stage vane derived by this study is produced. By applying a process that combines 3D printer and precision machining, a single-stage vane derived by this study is manufactured and is evaluated.
Structural Safety of Nozzle Plate using Simulation
Jong Yun Jung(정종윤),Heesung Park(박희성),Joon-Seob Kim(김준섭) 한국산업경영시스템학회 2018 한국산업경영시스템학회지 Vol.41 No.3
Modern manufacturing industries is to produce both precise and robust mechanical parts without failure while they are in service. In order to prevent a part failure for its lifetime, a mechanical design for a part should be examined on a basis of mechanical simulation. A nozzle plate, being a key part in steam engines, changes flow directions of steam in a turbine used in power plant. This paper is to the design and test for part safety and durability. Currently, nozzle plates are fabricated by welding nozzles to their plates. Welding causes some defects on the used materials while they are being manufactured. Another major defect is un-even pitches between welded nozzles. Welding causes phase changes because of high melting temperature of metal. This leads to decay on the welding spots, which weakens their structural strength and then, may lead to early damages on mechanical structures. This research proposes assembly-typed nozzle plate without welding. From the beginning, nozzle and plate are designed for insertion-typed assembly. Nozzle head and foot are designed in accordance with the grooves on outer ring and inner ring of a plate to make mating surfaces. Then the nozzle plate should be proved for structural and fatigue safety before they are put in manufacturing. This research adopts commercial softwares for modeling and mechanical simulation. The test result shows that the design with smaller mating area and deeper insertion produces higher safety in terms of structure and durability. From the conclusion, this paper proposes the assembly-typed nozzle plate to replace the welding typed.