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김병섭(Byung-Sub Kim),김영표(Young-Pyo Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The traditional grinding operations involve expensive machinery and generally have long manufacturing cycles and lengthy setup times. Hard turning is an attractive replacement of grinding and may be used in a pre-grind operation or in sequences that are followed by superfinishing. Hard turning shows lower costs and increased throughputs compared with grinding operation. In this paper we present the results of structural analysis of a high precision hard turning machine, where displacement errors at the end of tool tip are estimated induced by X- and Z-axes table locations with constant-flow hydrostatic bearings.
자기베어링 스테이지의 동적 거동 통합 시뮬레이션을 통한 제어 설계
김병섭(Byung-Sub Kim) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.4
The dynamic simulation of machine tools and motion control systems has been widely used for optimization, design verification, control design, etc. There are three main streams in dynamic simulation: structural dynamic analysis based on the finite element method, dynamic motion analysis based on equations of motion, and control system analysis based on transfer functions. Generally, one of these dynamic simulation methods is chosen and employed for specific purposes. In this study, an integrated dynamic simulation is introduced, in which the structure, motion, and control dynamics are combined together. Commercially well-known software is used in the integrated dynamic simulation: ANSYS, ADAMS, and Matlab/Simulink. Using the integrated dynamic simulation, the dynamics of a magnetic bearing stage is analyzed and the causes of oscillation and noise are identified. A controller design for suppressing a flexible dynamic mode is carried out and verified through the integrated dynamic simulation.
김병섭(Byung-Sub Kim) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.9
Servo control loops are a core part in the control architecture of machine tools. Servo control loops manage acceleration, velocity and position of all the axes in a machine tool based on commands. The performance of servo control loops sets the basis for quality of production parts and cycle time reduction. First, this paper presents a general control architecture of machine tools and several control schemes in literature, which can be applicable to machine tools control; including Zero Phase Error Tracking Control (ZPETC) and Cross Coupling Control (CCC). After that, modern control strategies to mitigate the problem of high speed machining are reviewed. In high speed machining, high accelerations excite the machine structure up to high frequencies, thereby exciting the structure’s modes of vibration. These structural vibrations need to be damped if accurate positioning or trajectory following is required. Input shaping is an attractive option in dealing with structural vibrations. The advantages and drawbacks of using input shaping technique for machine tools are discussed in detail.
ZnO 투명 전도막의 전기적 특성에 미치는 Al<sub>2</sub>O<sub>3</sub> 의 도핑 농도 및 방전전력의 효과
박민우,박강일,김병섭,이세종,곽동주,Park Min-Woo,Park Kang-Il,Kim Byung-Sub,Lee Se-Jong,Kwak Dong-Joo 한국재료학회 2004 한국재료학회지 Vol.14 No.5
Transparent ZnO:Al conductor films for the optoelectronic devices were deposited by using the capacitively coupled DC magnetron sputtering method. The effect of Al doping concentration and discharge power on the electrical and optical properties of the films was studied. The film resistivity of $8.5${\times}$10^{-4}$ $\Omega$-cm was obtained at the discharge power of 40 W with the ZnO target doped with 2 wt% $Al_2$$_O3$. The transmittance of the 840 nm thick film was 91.7% in the visible waves. Increasing doping concentration of 3 wt% $Al_2$$O_3$ in ZnO target results in significant decrease of film resistivity, which may be due to the formation of $Al_2$$O_3$ particles in the as-deposited ZnO:Al film and the reduced ZnO grain sizes. Increasing DC power from 40 to 60 W increases deposition rate by more than 50%, but can induce high defect density in the film, resulting in higher film resistivity.
가포화 자기스위치를 이용한 탈황탈질 시스템의 전원장치에 관한 연구
김수홍(Soo-Hong Kim),이용덕(Young-Duck Lee),김승모(Seung-Mo Kim),김병섭(Byung-Sub Kim),권병기(Byung-Ki Kwon),최창호(Chang-Ho Choi) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Generally, Capacitor charging power supply (CCPS) consist of the full-bridge inverter, LC resonant tank and capacitance load. The multi-connection systems are normally used for high voltage or high power application. In this paper, conventional parallel operation resonant type and proposed series operation PWM type CCPS for pulse corona occurrence of DeSOx, DeNOx system using magnetic pulse compressor make a comparison. The effect of proposed CCPS is verified by circuit characteristics analysis of parallel operation resonant type and series operation PWM type, and it is confirmed by simulation result.
신우철,노승국,김병섭,박종권,Shin, Woo-Cheol,Ro, Seung-Kook,Kim, Byung-Sub,Park, Jong-Kweon 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
Conventional shrink-fit tool holders have positive features, such as high accuracy, high strength, high stiffness and low sensitivity to centrifugal forces, but they require heavy investments for heating and cooling equipment. Generally the heating equipment has to heat the tool holder up to $200{\sim}300^{\circ}C$ for tool changes. This paper introduces a novel shrink-fit tool holder that is able to unclamp a tool at $40{\sim}50^{\circ}C$. This feature makes it possible to switch between the clamped and unclamped states by using a simple device, which has lower power, smaller size and lower cost than the heating equipment of the conventional shrink-fit tool holders. The proposed shrink-fit tool holder is able to expand its tool hole by using the shape memory alloys which are integrated in the tool holder body. Performances of the SMA shrink-fit tool holder were evaluated experimentally. The experimental results confirm that the proposed tool holder is feasible in aspects of clamping/unclamping operations, clamping force and repeatability of tool setup.
형상기억합금 기반 공구클램핑 장치를 위한 자동공구교환 시스템 개발
신우철,노승국,김병섭,박종권,Shin, Woo-Cheol,Ro, Seung-Kook,Kim, Byung-Sub,Park, Jong-Kweon 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.5
This study developed an automatic tool change system of the SMA-based tool clamping device for applications of micro-machine tools. This paper first describes clamping and unclamping procedures of the automatic tool change system and its basic configuration. Second, it presents fabrication techniques of components, such as a heating/cooling system and a tool loader. Finally, it describes automatic tool change test conducted with a prototype in which the fabrication techniques of components were employed. As the results of the test, times needed for clamping and unclamping operations were estimated to 18(s) and 8(s) respectively. The experimental results confirm that the proposed automatic tool change system can be sucessfully applied to micro-machine tools.
이준영 ( Jun Young Lee ),김병섭 ( Byung Sub Kim ),박영민 ( Young Min Park ) 대한피부과학회 2016 대한피부과학회지 Vol.54 No.9
The level of terrorist threats using chemical, biological, and radiological agents has been continuously increasing, and it is an undeniable truth that these agents are actually in use today. The fact that most chemical, biological, and radiological agents cause skin-related symptoms, and that the skin symptoms are observed at a relatively early stage of the condition, leads to the conclusion that dermatologists could be the first point of contact for potential victims of these agents. It is highly important that first responders are able to recognize symptoms caused by these agents early and react quickly. Therefore, dermatologists do have a responsibility to take on a role in dealing with chemical, biological, and radiological attacks, and pre-equip themselves with professional knowledge in this field. Among the various types of chemical agents, typical examples of agents causing skin-related symptoms are blistering agents, which lead to bullae and necrosis on the skin. Biological agents are classified from Category A to C according to their respective risk factors. The most dangerous Category A agents include anthrax, smallpox, plague, tularemia, and viral hemorrhagic fever, all of which are known to show characteristic skin-related symptoms. Upon exposure to a certain level of radiation, radiological agents can also lead to erythema on the skin. In this article, we will discuss various characteristics and up-to-date treatment methods of potential chemical, biological, and radiological agents to help dermatologists advance their knowledge in this field. (Korean J Dermatol 2016;54(9):683 ∼692)
송창규(Chang Kyu Song),김병섭(Byung-Sub Kim),노승국(Seung-Kook Ro),이성철(Sungcheul Lee),민병권(Byung-Kwon Min),정영훈(Young Hun Jeong) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.3
Control systems in machinery equipment provide correction signals to motion units in order to reduce or cancel out the mismatches between sensor feedback signals and command or desired values. In this paper, we introduce a simulator for control characteristics of machinery equipment. The purpose of the simulator development is to provide mechanical system designers with the ability to estimate how much dynamic performance can be achieved from their design parameters and selected devices at the designing phase. The simulator has a database for commercial parts, so that the designers can choose appropriate components for servo controllers, motors, motor drives, and guide ways, etc. and then tune governing parameters such as controller gains and friction coefficients. The simulator simulates the closed-loop control system which is built and parameter-tuned by the designer and shows dynamic responses of the control system. The simulator treats the moving table as a 6 degrees-of-freedom rigid body and considers the motion guide blocks stiffness, damping and their locations as well as sensor locations. The simulator has been under development for one and a half years and has a few years to go before the public release. The primary achievements and features will be presented in this paper.