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부유식 진자형 파력발전 시스템의 유압회로 설계에 관한 기초적 연구
김현호(H. H. Kim),이일영(I. Y. Lee),신승호(S. H. Shin),최종수(J. S. Choi),천호정(H. J. Cheon),김재환(J. H. Kim) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
The Hydrostatic transmission (HST) converts the reciprocal power into continuous power as the device involved the ocean waver energy converter (OWEC). This paper suggests a simulation model for the hydrostatic transmission (HST). Simulation and experimental results are compared with each other. And the validity of the simulation model is verified. Though the suggested simulation model, basic study is performed for the circuit design of HST.
핫프레스 공법을 이용한 CFRP-SUS304 하이브리드 복합소재 제조
김현호(H. H. Kim),이민식(M. S. Lee),강충길(C. G. Kang) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Carbon Fiber Reinforcement Plastics (CFRP) has been used as aerospace parts by vacuum forming or compression Recently, CFRP products have been increased the competitiveness with mass production of CFRP system. Also, hybrid composite is needed to improve the CFRP weakness such as low elongation. In this study, CFRP and SUS304 material is combined by hot press mold with temperature variable or loading time. As a result, optimal loading pressure and loading time is 0.4㎫, 5 minutes respectively. Especially, CFRP-SUS304 hybrid composites, which made by hot press molding, have a good interface states with each other.
유한요소해석을 이용한 자동차용 Oil Control Valve 단조 금형 설계
김현호(H. H. Kim),강충길(C. G. Kang) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Extrusion process can minimize the loss of the material, fast and low cost. However, extrusion of aluminum alloys is a complex and difficult process because tearing tends to occur at the surface. Therefore, Finite Element Analysis is necessary to minimize trial and error. The purpose of this study is that finding of optimal extrusion die for fabricating of Automotive Oil Control Valve by Finite Element Method. In summary, the considering geometric die design is selected to reduce the stress concentration by DEFORM 3D simulation tool.
김현호(H. H. Kim),이일영(I. Y. Lee) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
The purpose of this study is to achieve high-precision and broad-bandwidth reference tracking control for an electric hydrostatic actuator(EHA). For this purpose, firstly, a reference input tracking controller(consisting of a PI-D controller and a feed-forward controller) is designed for the EHA-driven system using the pole placement method and the zero placement method. The feed-forward controller has a tendency to show high gain symptom in frequency response as system"s actuation frequency increases. To suppress the increase of control gain in high frequency range, an input shaping filter(ISF) with the style of a lag compensator is incorporated in the designed control system. To verify the effectiveness of the proposed control system, experiments are performed. The results demonstrate that the application of the proposed control system including the ISF can greatly improve the reference tracking control performance of the EHA-driven system in broad-bandwidth. Also, it is verified that the proposed control system using the ISF is stable with enough margin in broad frequency range.