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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.
제로에너지타운 성과검증을 위한 성과산정 옵션에 대한 연구
홍성기(Seong Ki 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 have defined measurement and verification methods and procedures to assess the energy use of zero energy towns. Time series data conversion methods and algorithms have been proposed in performance evaluation options. To verify the feasibility of the method, the energy consumption of the freezer, which is an energy saving method, was measured and analyzed. we present an algorithm based on the annual base conversion and analyze it based on actual data. As a result, a k-means clustering moving average method is defined for the performance calculation option a, and the use time correction coefficient method is proposed. The validity of this method is verified through the verification.
지역난방에 의한 공동주택의 외기예측 : 최적제어의 적용성 연구
홍성기(Seong-Ki Hong),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.
홍성기(Seong-Ki Hong),장강원(Gang-Won Jang),심상훈(Sang Hoon Shim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A lightweight RTGC (Rubber-Tyred Gantry Crane) with high structural stiffness is designed by applying topology and shape optimization. Start ing from a design domain which is very simplified from an existing model, a new layout for RTGC is obtained through topology optimizat ion by maximizing static and dynamic stiffness of the structure while the mass usage is given as the design constraint. Because the design domain for topology optimization is mostly discretized by using solid elements, the optimized result should be approximated to have plate and beam members through post-process, during which the performance loss of the optimized result might happen. To avoid this, shape and thickness optimization are subsequently conducted for the post -processed RTGC. By using the morphing technique of the commercial optimizat ion software, Optistruct, the optimum profiles for the legs and the girder of the crane as well as their optimum thicknesses can be obtained. As a result, the finally-optimized crane can have a 9.1% reduced mass from the original model without sacrificing structural stiffness.
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.
지역난방 2차측 유량변화가 내부 열유속 및 에너지소비량에 미치는 영향에 관한 실험적 연구
홍성기(Seong-Ki Hong),조성환(Sung-Hwan Cho) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.5
The presented work demonstrates the effects of flow rate on the secondary side of DHS (District Heating System). Increasing flow rate at the secondary side of DHS decreases energy consumption and time to reach the set-point of the heated room while increasing heat flux on the floor in the heating space. When flow rate increases, the overall heat transfer rate of radiant floor also increases. However, the results also show overall heat transfer rateto not increased linearly and thus the existence of an optimal flow rate for the secondary side of DHS. Control of the radiant floor with hot water may be more effectively accomplished with a combined control strategy that includes heat flux and a temperature set-point. This experimental analysis has been performed using a lab-scaled DHS pilot plant located at Jeonju University in Korea.
공급수 온도 제어방안에 따른 난방에너지 공급 및 사용 패턴 비교 연구
홍성기(Seong-Ki Hong),조성환(Sung-Hwan Cho) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In this study, the actual energy consumption of the secondary side of District Heating System(DHS) with different hot water supply temperature control methods are compared. Two methods are Outdoor Temperature Reset Control and Outdoor Temperature Prediction Control. While Outdoor Temperature Reset Control has been widely used for energy savings of the secondary side of the system, the results show that Outdoor Temperature Prediction Control method saves more energy. In general, Outdoor Temperature Prediction Control method is lowering the supply temperature of hot water, and it reduces standby losses and increases overall heat transfer value of heated spaces due to more flow into the space. This study was controlled by the differential pressure control valve applications, inverter system applied, the drive system and differential pressure control valve for mixing application, such as the outside temperature predictions second in just three of the secondary supply of hot water supply system. Empirical results showed that the heat energy use pattern of user side could be existed.
에어/전기 기반 제조공정에서의 에너지 최적화 모델 연구
홍성기(Seong-Ki Hong),조성환(Sung-Hwan Cho) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In this study, the actual air consumption of an auto parts manufacturing process has been simulated. its processes are composed of casting boilers, compressed air, foundry, precipitators, and etc.. these processes are using the air that is produced in each of the air compressor in accordance with the consumption of air. At this study, Mathematical optimization model has been made and simulated for the time number control method for optimizing the power consumption and the results have been compared with the conventional control method and the possibility of energy saving by optimization management has been evaluated than conventional control method. The results has shown as follows: Compressed air consumption and the electric cost by optimization process has showed more than 18% savings when it has manufacturing process in accordance with the air compressor operating scenario by conventional air compressor control method