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이병용(ByeongYong Lee),임병직(ByoungJik Lim),최환석(Hwan-Seok Choi) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.5
나로우주센터 연소기 시험설비(CCTF)의 부속설비로 운영 중인 공용설비(각 시험설비에 추진제를 공급해 주는 설비)에는 3종 5세트의 극저온 펌프가 있으며 엔진 구성품, 엔진, 추진기관, 조립동, 발사대등의 시험을 지원하기 위해 지속적으로 운용되는 액체 로켓 개발을 위한 필수적인 기반시설이다. 고압질소 생성 펌프 전단의 부스터 펌프, 고압질소 생성 펌프, 산화제 이송 펌프의 특성에 대하여 고찰하였다. 5 sets of cryogenic pumps of 3 kind common facility (facilities that supply propellant to each test facility) which is operated of Naro Space Center at Combustor Chamber Test Facility (CCTF) It is essential infrastructure for the development of liquid rocket that are continuously operated to support such tests. A Review of the booster pump, high pressure nitrogen production pump, and Liquefied oxygen transfer pump of Characteristics.
이병용(ByeongYong Lee),임병직(ByoungJik Lim),최환석(Hwan-Seok Choi) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
나로우주센터 연소기 시험설비(CCTF)의 부속설비로 운영 중인 공용설비(각 시험설비에 추진제를 공급해 주는 설비)에는 2세트의 고압 질소생성 펌프가 있으며 질소 공급을 위하여 연속적으로 작동되는 펌프성능 변화 확인이 필요하다. 펌프의 성능을 유지하기 위하여 펌프성능 관찰이 필요하며 수리 전과 후의 성능을 확인해 보았다. 2 sets High Pressure Nitrogen pumps in common facility (facilities that supply propellant to each test facility) which is operated of Naro Space Center at Combustor Chamber Test Facility (CCTF). Pump performance was checked for stable nitrogen supply. It is necessary to check the performance of pumps operated continuously for nitrogen supply. In order to maintain the performance of the pump, it is necessary to observe the performance and check the before and after repair.
Nosé-Poincaré 분자동역학을 이용한 나노와이어의 역학적 거동
이병용(Byeongyong Lee),조맹효(Maenghyo Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Mechanical behaviors of copper nanowire are investigated. An FCC nanowire models are consist of about 3,000 atoms. Simulations are performed within Nose-Poincare MD algorithm and NVT ensemble setting without periodic boundary conditions. Nose-Poincare is applied to guarantee the preservation of Hamiltonian and temperature. Bending and torsion simulations of nanowire in (100) plane are carried out. Bending and torsion simulations are carried out with constant angle change rate. Stress-strain curve is constructed from the calculated Cauchy stresses and specified strain values. Nonlinear behavior starts with dislocation or twinning.
Nosé-Poincaré 분자 동역학 알고리즘을 이용한 나노 와이어의 역학적 거동 해석
이병용(Lee Byeongyong),조맹효(Cho Maenghyo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Mechanical behavior of copper nanowire is investigated. An FCC nanowire model composed of 1,408 atoms is used for MD simulation. Simulations are performed within NVT ensemble setting without periodic boundary conditions. Nose-Poincare MD algorithm is employed to guarantee preservation of Hamiltonian and temperature. Numerical tensile tests of Nanowire are carried out with constant strain rate. Additionally, temperature and strain rate effects are considered. Stress-strain curve is constructed from the calculated Cauchy stresses and specified strain values. In (22,4,4) Copper nanowire, non-linear behavior appears around ??0.09. At this instance, starting of structural reorientations are observed. At the onset of reorientation, the modulus characteristics are also investigated.
Nosé-Poincaré 분자동역학을 이용한 나노와이어의 역학적 거동 해석
이병용(Byeongyong Lee),조맹효(Maenghyo Cho) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Recently, simulations of metallic nanowire are largely focused. In this work, mechanical behavior of copper nanowire is investigated. An FCC nanowire model composed of about 1408~5000 atoms is used for simulations. Simulations are performed within NVT ensemble setting without periodic boundary conditions. Nose-Poincare MD algorithm is employed to guarantee preservation of hamiltonian and temperature. Numerical tensile tests of nanowire are carried out with constant strain rate. The effect of strain rate, temperature and size on the [100] stretching behavior of nanowire is investigated. Size effects are investigated through the simulation of characteristic size 1.5㎚, 2㎚ and 2.5㎚. Strain rate effects are subjected to about 600/ms and 1000/ms. Temperature effects are subjected to 300K and 554K. In these processes, stress-strain curve is constructed from the calculated Cauchy stresses and specified strain values.