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한명철(Myung-Chul Han),성창민(Chang-Min Sung),김정관(Jung-Kwan Kim),권유홍(Yu-Hong Gwon) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
A cable tray is a fixture to support and protect electrical and communication cables. In this study, a roll-forming analysis is conducted to produce an all-in-one cable tray. The number of process stands is calculated using an empirical formula. By applying bending methods to the design of the roll flower pattern, the final process stands and forming angles are determined. The shape and stress variations in the cable tray are modeled and observed by roll forming analysis using LS-DYNA Software. The width of the side rail and the maximum stress on all stands does not exceed the reference values. The forming machine and rolls are manufactured based on the results of the roll forming analysis. In addition, all-in-one cable trays satisfy the National Electrical Manufacturers Association standards when they are manufactured according to this design.
수중발사를 위한 ATP 방식 압축수 방출시스템의 동특성 해석
한명철(Myung-Chul Han),김정관(Jung-Kwan Kim),김광수(Kwang-su Kim) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.6
The underwater launch system using an ATP consists of five parts: compressor tank, proportional flow control servo valve, expulsion spool valve, air turbine pump, and discharge tube. The purpose of this study is to develop an underwater launch system using an ATP and to verify the validity of the system. The proportional flow control servo valve is modeled as a 2nd order transfer function. The projectile is ejected by pressurized water through the air turbine pump, which is controlled by expulsion valve. The mathematical model is derived to estimate the dynamic characteristics of the system, and the important design parameters are derived by using simulations. The computer simulation results show the dynamic characteristics and the possibility of control for underwater launch system.
한명철(Myung-Chul Han),성창민(Chang-Min Sung) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.6
In this paper, a doubly fed induction generator wind turbine is presented to account for uncertainties in operation. The controllers generally used for these wind turbine systems cannot guarantee stable performance. Therefore, robust control schemes are proposed, which ensure that below the rated speed, the power output is maximized, and above the rated speed, the power output is regulated. The designed controllers guarantee uniform ultimate boundedness. By setting the bound values of the set where the uncertainties are laid or moved, the controllers facilitate the accessing of the control target. To verify the proposed control schemes, stability analysis and simulation results are presented.
Note on behavior of a coupled nonautonoumous ordinary differential equation
홍금식,한명철,이석,윤중선,Hong, Keum-Shik,Han, Myung-Chul,Lee, Suk,Yun, Joong-Sun Institute of Control 1995 제어·로봇·시스템학회 논문지 Vol.1 No.1
결합된 시변 상미분 방정식의 해외 점근적 성질에 관한 연구이다. 리아프노프 직접 방법에 의하면 평등 안정성(uniform stability)만 얻어졌을 경우이지만, 추가적으로 상태 벡터 중 일부가 0으로 점근적 수렴함을 보이는데 있다. 얻어진 결과는 특히 불변원리(invariance principle)가 성립하지 않는 시변 시스템에 유용하다.