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한명철(Myung-Chul Han),김정관(Jung-Kwan Kim),허승현(Seung-Hyun Heo),김성렬(Sungryul Kim),김찬봉(Chanbong Kim) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
The acoustic emission (AE) sensor has been widely used for monitoring the machining states or tool abrasion, etc. This paper presents the relation between machining time and states such as tool abrasion for ceramic machining processes, which can be applicable to develop the dentistry machining center. A commercial PZT-type of AE sensor was used for experiments, and the aquisition data was analyzed in the AE signal strength versus machining time. The results show that it is possible to estimate the tool life and the ceramic machining state. In the future, additional experiments for various machining conditions such as depth of cut and feed rate are strongly necessary so as to design an effective monitoring system for the ceramic machining processes through detecting the AE signal.
한명철(Myung-Chul Han),성창민(Chang-Min Sung),황욱(Wook Hwang) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.12
In this paper, we consider variable speed wind turbine systems containing uncertain elements. Though PI controller is generally used for pitch control, it cannot guarantee a stability and performance of the complicated wind turbine systems. A robust pitch control scheme is proposed to regulate the electric power output above the rated wind speed. The pitch controller is designed in order to guarantee uniform boundedness and uniform ultimate boundedness based on the bound values of the set where the uncertainties are laid or moves. In order to verify the proposed control scheme, we present stability analysis and simulation results using Matlab/Simulink.
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),김정관(Jung-Kwan Kim),최명욱(Myoung-Wook Choi),이왕근(Wang-Guen Lee),김헌주(Heon-Joo Kim) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
The dental high-speed handpiece is one of the most popular and important devices that has been widely used as the main means of cutting tooth structure and restorative materials in dentistry. In consideration of usage and marketability of the dental handpiece, it is obviously worthy of investigating it. In this paper, a high speed dendal handpiece is developed through reverse engineering with 3D X-Ray CT equipment and wire cutter for the Mark II model in NSK. The demension of the handpiece parts is obtained through this process, and 3D modeling is performed with CATIA V5. The interference between parts can be examined through the part assembly in CATIA, and the performance is finally compared with Mark II model in NSK.
치과용 고속 에어터빈 핸드피스의 공급관로 분석 및 성능평가
한명철(Myung-Chul Han),김정관(Jung-Kwan Kim),최명욱(Myoung-Wook Choi) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.1
The dental high-speed air turbine handpiece is one of the most popular devices that have been widely used as the main means of cutting tooth structure and restorative material in dentistry. In consideration of usage and marketability of the dental handpiece, it is obviously worthy of investigating it. The goal of this paper is to establish the relationship between the air turbine speed and the supply route inside the handpiece. To do this, the Computational Fluid Dynamics (CFD) tool, Fine<SUP>TM</SUP>/Turbo is used and the optimal supply route position is suggested from the simulation results. In addition, as an attempt for domestic product, the reverse engineering process of a high speed dental handpiece by 3D X-Ray CT equipment and wire cutting is presented for the Mark II model in NSK. In doing so, the 3D modeling of the handpiece parts is carried out with CATIA V5, and the interference between parts is examined. Finally, the result of performance test for the prototype produced in this research is presented.
Kinematics Analysis of a 5-Axis Ultrasonic Inspection Equipment
한명철(Myung-Chul Han),성창민(Chang-Min Sung) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.1
In this paper, it is studied that kinematic analysis of a 5-axis ultrasonic inspection equipment. The equipment is comprised of three straight axes and two rotary axes. With features of ultrasonic, the transmitter and receiver of the equipment are vertical to a test surface, operating at regular intervals. To perform this well, the motions of every link should be found on the based of kinematic analysis of the equipment. We chose starting point for testing and defined relations among all links through transformation of coordinates. For double curvature-shaped test object, we generated test paths. To follow these, we found motions of all links using inverse kinematics. By using Matlab/Simulink, simulator was developed, so that we could find out desired trajectories of main axes for a scan.