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- 저자 : 한성현(S.H. Han) (검색결과 139 건)
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한성현(S. H. Han),이경환(K. H. Lee),최종욱(J. W. Choi),김재수(J. S. Kim) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
The flow characteristics of inertance pulse tube cryocooler(IPTC) was investigated with a computational thermal fluid dynamics for the reciprocating flow in IPTC including the piston movement of linear compressor. Two dimensional axisymmetric modeling was applied for the flow in an IPTC with a clearance between the piston and cylinder wall of linear compressor. The pressure, velocity, and temperature distribution were examined for the steady state. These were compared with previous results to confirm the validity in the modeling and computational results. The leakage between piston and cylinder wall affect the cooling capacity seriously. The dependence on mesh numbers were also examined to obtain a proper mesh numbers to improve the accuracy of calculation, which showed significant effect on the results. The user-defined function was used for the process of compression and expansion of piston.
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TMS320C31칩을 사용한 산업용 로보트의 실시간 적응제어기 설계
한성현(S. H. Han),김용태(Y. T. Kim),이만형(M. H. Lee),김성권(S. K. Kim),김진오(J. O. Kim) Korean Society for Precision Engineering 1996 한국정밀공학회지 Vol.13 No.10
This paper presents a new approach to the design of adaptive control system using DSPs(TMS320C31) for robotic manipulators to achieve accurate trajectory tracking by the joint angles. Digital signal processors are used in implementing real time adaptive control algorithms to provide an enhanced motion control for robotic manipulators. In the proposed control scheme, adaptation laws are derived from the improved Lyapunov second stability analysis method based on the adaptive model reference control theory. The adaptive controller consists of an adaptive feedforward controller, feedback controller, and PID type time-varying auxiliary control elements. The proposed adaptive control scheme is simple in structure, fast in computation, and suitable for implementation of real-time control. Moreover, this scheme does not require an accurate dynamic modeling, nor values of manipulator parameters and payload. Performance of the adaptive controller is illustrated by simulation and experimental results for a SCARA robot.
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진동형 히트 파이프에서 튜브의 지름과 개수에 따른 전산 열유동해석
한성현(S.H. Han),최종욱(J.W. Choi),김성초(S.C. Kim) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.1
In this paper, heat transfer characteristics of pulsating heat pipes are investigated with the diameter and the number of tubes through the computational analysis of thermal flow. The numerical simulation includes the phase change precess with VOF model using OpenFOAM software. The numerical code is modified for the phase change to occur with saturation temperature. The numerical results are compared with the previous ones to validate the present code. The resonable results have been obtained based on the mass transfer time relaxation parameter considering the density ratio. When the ratio of length to diameter and the number of tubes are on the decrease, the thermal resistances also tends to decrease in the pulsating heat pipes. These numerical results will supply the base line data to design and to manufacture the pulsating heat pipe.
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