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홍성기(Seong Ki Hong),홍정기(Jung Ki Hong),김태현(Tae Hyun Kim),박진균(Jin Kyun Park),김상현(Sang Hyun Kim),장강원(Gang-Won Jang) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12
수직 다관절 로봇의 세 가지 주요 부품인 베이스프레임, 하부프레임, 상부프레임의 경량화를 위하여 위상최적화를 적용하였다. 위상최적화를 위한 설계 영역은 기존 모델을 포함시키는 단순 영역으로 설정하고 이를 삼차원 솔리드 요소로 이산화하였다. 설계 변수들은 SIMP 법을 사용하여 각각의 요소의 물성치를 파라미터화 시켰다. 로봇의 다물체 동역학 해석으로부터 얻어진 하중들을 로봇의 하중조건으로 부여하였으며 최적화의 목적 함수는 구조의 정적, 동적 강성의 조합으로 설정하고 제한조건은 질량제한 조건을 부과하였다. 위상최적설계로 얻은 결과는 주조 제조에 용이한 설계로 후처리하였다. 최종 최적화 모델은 기존 모델과 비교하여 비슷하거나 큰 정적, 동적 강성을 가지면서 베이스프레임은 11.0%, 하부프레임은 12.0%, 상부프레임은 10.0% 경량화시킬 수 있었다. Topology optimization is applied for the lightweight design of three main parts of a vertical articulated robot: a base frame, a lower and a upper frame. Design domains for optimization are set as large solid regions that completely embrace the original parts, which are discretized by using three-dimensional solid elements. Design variables are parameterized one-to-one to the material properties of each element by using the SIMP method. The objective of optimization is set as the multi-objective form combining the natural frequencies and mean compliances of a structure for which load steps of interest are selected from the multibody dynamics analysis of a robot. The obtained results of topology optimization are post-processed to designs favorable to manufacturability for casting process. The final optimized results are 11.0% (base frame), 12.0% (lower frame) and 10.0% (upper frame) lighter with similar or even higher static and dynamic stiffnesses than the original models.
홍성기(Seong Kim Hong),장숙희(Suck Hee Jang),남윤광(Yun Gyang Nam),조성환(Sung-Hwan Cho) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.5
In this study, we investigated the optimal control method and the energy saving possibility when the dimming control and suspended particles display(SPD) were applied to reduce the lighting load and the cooling load in office buildings. Simulations were carried out in the same manner except for the transmittance, and the baseline model, the dimming control model, the dimming control and suspended particles display(SPD) model were performed at 8:00 am to 7:00 pm on August 14. Simulation results show that the cooling and lighting energy usage is reduced to 21.2% compared to the baseline model. Therefore, it was possible to predict the optimum control method of the suspended particles display(SPD) to control the transmittance with time and dimming control.
지역난방에 의한 공동주택의 외기예측/최적제어에 대한 실험적 연구
홍성기(Seong-Ki Hong),김주완(Joo-Wan Kim),류상범(Sang-Bum Lyu),조성환(Sung-Hwan Cho) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The objectives of this study are to find the optimal control method for apartment house with district heating system experimentally. An experimental facility consisting of small sized district heating system including heat exchangers and floor heating room have been built. The facility enables to compare the results of various control methods. This study have experimented about set point control method, outdoor reset control method and predictive optimal control method on the supply water temperature of heat demand side. Results show that 4.2% of outdoor reset control method, 11.6% of predictive optimal control method were able to save heating energy more than typical supply water temperature control method. And the predictive optimal control method have showed most effective method control.
해상 LNG 벙커링용 8 인치 선회 조인트의 구조강도 평가와 신뢰성 해석
임성환(Seong-Hwan Lim),송창용(Chang-Yong Song),박우창(Woo-Chang Park),홍성기(Seong-ki Hong),이정(Jung Lee),김세민(Se-min Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
There is a growing need for LNG bunkering system development with increasing demand for LNG fuel. The application of LNG bunkering system allows the LNG mined from the offshore plant to be transported directly to the LNG carrier hold at sea. The LNG bunkering system requires various safety modules to safely transport the LNG at cryogenic temperature. The swivel joint of the LNG bunkering system is a safety module to prevent excessive stress due to external forces by not restraining the rotational motion of the flexible hose line. In this study, the structural strength of an 8-inch swivel joint was evaluated based on the design load conditions of OCIMF, the international design specification for crude oil and LNG transport systems. For evaluating the structural strength, the three dimensional finite element model of 8-inch swivel joint was generated and finite element analysis was carried out considering the OC-IMF design load conditions. Reliability analysis was performed using Monte Carlo simulation(MCS) in order to improve design safety by considering uncertainty of operating environment. In the reliability analysis, the reliability level of structural strength results according to the variation of the design load in the ocean were evaluated.
전류밀도에 따른 SnAg 도금층의 특성 및 Cu 필라 솔더 범프의 단면 미세구조 측정
김상혁(Sang-Hyuk Kim),홍성기(Seong-Ki Hong),임현호(Hyunho Yim),이효종(Hyo-Jong Lee) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.4
We investigated the surface morphology and the change of Ag concentration for SnAg electrodeposits according to the current density using labmade and commercial plating solutions. The concentration of Ag in the SnAg electrodeposits decreased with increasing the current density. The Ag concentrations at the conditions of over 50 mA/㎠ were below 3 wt% and the surface was relatively smooth. Cu pillar bump was fabricated by using SnAg electroplating, and it was reflowed at 240℃ for 90 sec. The cross-sectional microstructure was investigated by using EBSD measurement and it was found that the grain size of SnAg became smaller by increasing the number of reflow treatments.
대추씨 제거장치를 이용한 저장 중 대추씨 제거 성능평가
이선호 ( Sun Ho Lee ),김영근 ( Young Keun Kim ),홍성기 ( Seong Gi Hong ),박종률 ( Jong Ryul Park ) 한국산업식품공학회 2016 산업 식품공학 Vol.20 No.1
Deseeded jujubes are commonly consumed as snacks. This study was conducted to develop a seed-removing machine for jujubes that relieves hard work in manual seed removal. The seed-removing machine consists of a jujube supplying unit, a punching unit, and a discharging unit. To test the performance of the machine, shape characteristics, seed removing rate, sarcocarp cracking rate, and flesh hardness were analyzed throughout the jujube storage period. The machine showed good seed removing and sarcocarp cracking rates at room temperature and cold temperature storage on days 2, 15, and 50. Seed removing rates were 80% at day 15 and 96% at day 50. The sarcocarp cracking rates were 33% for day 15 and 30% for day 50. Hardness started to decrease from day 8 to day 70 at both room temperature and cold temperature storage. The working capacity of the machine was 900 fruits/h. The results showed that the jujube seed removing machine is useful for reducing the labor requirements of postharvest jujube processing.