ADAMS를 이용한 다기능 복합가공기 이송시스템의 동특성 해석

정상화,차경래 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1

다기능 복합가공기에서, 가공공정의 정밀도를 높이기 위해 틸팅터릿 이송시스템의 설계는 매우 중요하다. 틸팅터릿 유니트는 3축 이송시스템으로 이송되어지므로 매우 주의를 기울여 설계하여야 할 부분이다. 본 논문에서는 틸팅터릿이 장착되어 있는 3축 이송시스템을 모델링하였고 효율적인 설계를 가능하게하는 가상시제품 개발의 첫 단계로서 ADAMS를 이용하여 시뮬레이션하였다. 또한, 3축 이송시스템의 동적거동을 그래프와 동영상을 통하여 가시화하였다. In multi-purpose lathe, the design of tilting turret slide system has an important and critical role to enhance accuracy of the machining process. Tilting turret unit is traveled by 3-axis slide systems. There is a need to design this part very carefully. In this paper, the 3-axis slide system with tilting turret unit is modeled and simulated using ADAMS software. The dynamic behavior of this system is visualized by data graphs and dynamic animations. The first step of virtual prototype which makes it possible to design economically and effectively is developed.

포화 시스템의 비선형 제어에 대한 안정성 연구

정상화,류신호,차경래 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1

물리적인 제한에 의한 액츄에이터의 비선형적인 포화상태의 특성을 연구는 실제 제어시스템의 설계는 매우 필요하다. 액츄에이터의 비선형적인 포화상태는 제어기 성능의 저하뿐만 아니라 작동 초기와 말기동안 큰 오버슈트를 일으킬 수도 있고 오버슈트가 증가함에 따라 시스템은 진동을 일으키면서 불안정해질 수 있다. 본 논문에서는 포화상태에서 좋은 성능을 갖고 리셋 와인드업을 예방하는 슈퍼바이저 제어 기법을 제안하였다. 또한, 동적제어기를 가진 슈퍼바이저 제어기를 사용하는 포화된 시스템의 안정성을 연속시간계와 이산시간계에서 각각 연구하였다. 이산시간 동적제어기에 의해 제어되는 전형적인 포화상태를 갖는 생산 분배 시스템에 대한 슈퍼바이저 제어의 효율성을 설명하기 위하여 수치적인 예가 제시되었고 시뮬레이션에 의하여 기본적인 결과를 확인하였다. In realistic control systems, the nonlinear saturation attributes of the control actuator due to physical limitations should be taken into account. This nonlinear saturation of actuators may cause not only a deterioration of the control performance but also a large overshoot during start-up and shut-down. As the overshoot increases, the system may become oscillatory unstable. In this paper, the supervisor implementation which guarantees good performance for saturation operation and prevents reset wind up is presented. Moreover, the sufficient conditions of the stability for saturated system using supervisory control with a dynamic controller are provided in the continuous-time and in the discrete-time domain. Numerical examples are presented to depict the efficiency of supervisory control for a typical saturated production-distribution system controlled by a discrete-time dynamic controller and to validate basic results by simulation.

초정밀 광소자 정렬 스테이지의 구동 특성에 관한 연구

정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

As the optical communication is introduced to the backbone network at first and becomes a general communication method of network, the demand of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM(Wavelength Division Multiplexing) element increases. The alignment and the attachment technology are very important in the fabrication of optical elements. In this paper, the driving mechanism of ultra precision stage is studied with the aim of optimal design of stage. The travel and the resolution of stage are investigated. The hysteresis of the stage is generated because of PZT actuator. The hysteresis and the inverse hysteresis are modeled in X, Y, and Z-axis motion. The input data of desired displacement to the stage according to input voltage is obtained from the inverse hysteresis equation. In the result of experiments with the input data, the errors due to hysteresis are well compensated.

극초정밀 다축 스테이지의 광소자 정렬에 관한 연구

정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In recent years, as the demands of VBNS and VDSL increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM elements increases. The alignment and the attachment technology are very important in the fabrication of optical elements. In this paper, the optical alignment characteristics of multi-axis ultra precision stage were studied. The alignment algorithms were studied for applying to the ultra precision multi-axis stage. The alignment algorithm is comprised of field search and peak search algorithms. The contour of optical power signals can be obtained by field search and the precise coordinate can be found out by peak search. Two kinds of alignments, such as 1ch. input vs. 1ch. output optical stack, and 1ch. input vs. 8ch. output PLC stacks were performed for investigating the alignment characteristics.

조명 조건에 강건한 스마트폰 카메라 맥박 측정을 위한 다이내믹 레인지 재구성 알고리즘

박상욱,차경래 대한임베디드공학회 2015 대한임베디드공학회논문지 Vol.10 No.1

Recently, handy pulse measurement method was introduced by using smart phone camera. However, measured values are not consistent with the variations of external light conditions, because the external light interfere with dynamic range of captured pulse image. Thus, adaptive dynamic range reconstruction algorithm is proposed to conduct pulse measurement robust to light condition. The minimum and maximum values for dynamic ranges of green and blue channels are adjusted to appropriate values for pulse measurement. In addition, sigmoid function based curve is applied to adjusted dynamic range. Experimental results show that the proposed algorithm conducts suitably dynamic range reconstruction of pulse image for the interference of external light sources.

초경합금 소재 LCU_CL 코어의 초정밀 연삭 특성에 관한 연구

정상화,차경래,김현욱,이봉주 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

As the various manufacturing technology of optical glass is developed, the aspherical lenses are applied to many fields. However, It is still very difficult to manufacture glass lens because of the high cost and the short life of core. In recent years, the demands of the aspherical glass lenses increase since it is difficult to obtain the desirable performance in the plastic lens. In the glass mold lens, it has merits of high productivity and reproductivity since lens is manufactured by the only forming with high precision mold. The fabricating conditions for glass mold lens are glass surface that does not cause fusion, viscosity of 108-1013 poise for the 0.2㎛ accuracy, and viscoelasticity for the roughness less than 100 angstrom. In this thesis, ultra-precision grinding characteristics of tungsten carbide for forming the aspherical glass lens core were studied and the result of it is applied to manufacture the tungsten carbide-base core of the glass lens used to the laser scanning unit and the camera phone.

건전지 자동화 조립라인의 라벨링부의 Virtual Prototype 개발

정상화,차경래,김현욱,신병수,나윤철 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

Most of battery industries are growing explosively as a core strategy industry for the development of the semi-conductor, the LCD, and the mobile communication device. In this thesis, dynamic characteristics of the steel can labeling machine on the automatic cell assembly line are studied. Dynamic characteristic analysis consists of dynamic behavior analysis and finite element analysis and is necessary for effective design of machines. In the dynamic behavior analysis, the displacement, velocity, applied force and angular velocity of each components are simulated according to each part. In the FEA, stress analysis, mode analysis, and frequency analysis are performed for each part. The results of these simulations are used for the design specification investigation and compensation for optimal design of cell manufacturing line. Therefore, Virtual Engineering of the steel can labeling machine on the automatic cell assembly line systems are modeled and simulated. 3D motion behavior is visualized under real-operating condition on the computer window. Virtual Prototype make it possible to save time by identifying design problems early in development, cut cost by reducing making hardware prototype, and improve quality by quickly optimizing full-system performance. As the first step of CAE which integrates design, dynamic modeling using ADAMS and FEM analysis using NASTRAN are developed.

광정렬용 초정밀 다축 위치제어 장치 개발에 관한 연구

정상화,차경래,이경형,김광호 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2

As optical fiber communication grows, the fiber alignment become the focus of industrial attention. This greatly influence the overall production rates for the opto-electric products. We proposed multi-axis nano positioning stage for optical fiber alignment. This device has 3 DOF translation and sub nanometer resolution. This nano stage consist of 3 PZT-driven flexure stages which are stacked parallel. The displacement of it is measured with capacitance gauge and is controlled by computer-embedded main controller. The design process of flexure stage using FEM is proposed and the performance evaluation of this system is verified with experiments.

다기능 복합가공기 이송시스템의 가상시제품 개발

정상화,차경래,김상석 제어로봇시스템학회 2000 제어로봇시스템학회 국내학술대회 논문집 Vol.2000 No.10

다기능 복합가공기 이송시스템의 가상시제품 개발

정상화,차경래,김상석 제어로봇시스템학회 2000 제어로봇시스템학회 국내학술대회 논문집 Vol.1 No.10