• Journal of Advanced Marine Engineering and Technology
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• v.33 no.5
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• pp.729-737
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• 2009

This paper introduces the machine tools feed system, which can be optimized the control's performance through simulation and the adjustment of the mechanical components. One method simulates the frequency response of the speed-loop with the design value using the MATLAB application, so that all of the interpolation axis can be equal to the response bandwidth, resulting in a high accuracy rate. The other method sees the mechanical component being adjusted by analyzing the results of various experiments. Lastly, this client's program is able to change the parameters that are related to the FFD, as well as the parameters in the friction compensation of the OPEN-CNC.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.4
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• pp.214-222
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• 2003

Studies on the optimization of machining process can be divided into two different approaches: off-line feedrate scheduling and adaptive control. Each approach possesses its respective strong and weak points compared to each other. That is, each system can be complementary to the other. In this regard, a combined system, which is a feedrate control system fur cutting force optimization, was proposed in this paper to make the best of each approach. Experimental results show that the proposed system could overcome the weak points of the off-line feedrate scheduling system and the adaptive control system. In addition, from the figure, it can be confirmed that the off-line feedrate scheduling technique can improve the machining quality and can fulfill its function in the machine tool which has a adaptive controller.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2000.10a
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• pp.299-303
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• 2000

A brushless linear motor is suitable for operation with higher speed and precision. Since it does not involve mechanical coupling, linear driving force can be applied directly. Conventional PID and fuzzy controllers are implemented and performance results using those controllers are compared. Along with better simulated performance observed using fuzzy controller, further fabrication is to be included with various empirical results. Several system operational characteristics have been observed. Typical nonlinearities as friction, cogging and torque or thrust ripple that might deteriorate system performance would be tackled using presumably effective method such as neural network based learning controller.

• Journal of Advanced Marine Engineering and Technology
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• v.18 no.4
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• pp.62-68
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• 1994

Recently, the trends toward reduction in size and weight of industrial products increased the application of micro hole for manufacturing gadgets of high precision and gave rise to a great deal of interest for micro hole drilling M/C. Quite a few research work is performed on micro drilling on domestic basis compared with the tendency of analyzing cutting mechanism, adaptive control, monitoring of generally available drills of diameter greater than 1mm. This study adresses the design, manufacturing and controlling a micro hole drilling M/C with the overload detection instrument and the step feed mechanism. Controlling and monitoring of the drilling process are acomplished on PC basis for more user interfaces and effectiveness. The test machine of the results of this research shows a good foundation for extending further micro hole machining technique.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.157-158
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• 2020

항만용 자율주행 야드트럭운행 환경은 무신호교차로 주행, 낮은 GPS정확도, 악천후상황주행, 이송 컨테이너 위치변경등과 같이 일반 도로의 센서기반의 자율주행차량 운행과 다르게 매우 복잡하다. 이를 위해서는 항만내 특성을 반영한 실시간 위치, 속도 등에 대한 정확한 인식이 중요한 요소이다. 이를 위해서 센서융합과 V2X기반의 복합적인 항만용 실시간 로컬 동적지도 (Local Dynamic Map) 생성 및 V2X기반의 협력측위를 통하여서 기존의 독립적인 자율주행차량의 위치 인식보다 더 개선된 고정밀 위치 인식 정보추출이 필요하다. 본 연구에서는 복합적인 항만용 동적지도 생성관리시스템의 설계 방안 및 협력측위 기술 적용 방안을 제시하고 이를 활용한 항만 구역내 자율주행차량 및 모든 화물 이송장비들의 실시간 위치 인식뿐만 아니라 이동체의 사전 충돌예측 및 비상정지 안전 제어 가능한 V2X 기반의 인텔리젼스 한 3차원 관제시스템 설계 방안을 제시하고자 한다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.12 no.2
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• pp.206-214
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• 1988

To improve the surface waviness in the peripheral milling, the feedrate is controlled so that the cutting force measured in the normal direction to the workpiece is constant. A discrete time first order model between the feedrate and the tool deflection is derived for the control. It has been shown by the analysis that the tool deflection is directly related to the feedrate and largely affects the surface waviness during cutting. The experimental results shown that the surface waviness is drastically improved by the proposed methods.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1125-1130
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• 2005

This paper presents a method for inter-sheet spacing control in a flexible media handling device. In order to verify the performance of inter-sheet spacing control by experiment, system of section structure is introduced in the first place. In the introduced system, each section is driven by different servo motor for independent section freedom. And suitable inter-sheet spacing control algorithm that is more optimal than conventional inter-sheet spacing control algorithm is proposed. Finally experiments are performed to confirm the performance of inter-sheet spacing control. And two inter-sheet spacing control algorithms, conventional and proposed, are compared with each other.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1764-1765
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• 2011

피에조 액추에이터는 세라믹 소재의 압전 특성을 이용한 전기식 액추에이터로, 이에 사용되어지는 세라믹스는 전자분야의 기초재료로 다양한 연구가 이루어지고 있다. 통신기기, 의료기기, 초정밀 액추에이터, 초음파 모터 등 각종 정밀 센서와 측정 계측기기와 같이 가정용에서부터 첨단 기술 분야 까지 광범위하게 이루어지고 있다. 이와 같이 첨단 기술 분야에 각광 받고 있는 압전 소재 제품중, 본 논문에서는 국내 개발 및 시장 진입이 어려운 초정밀 액추에이터를 선택 하였으며, 전압 이송소자를 활용하기 위한 연구소단위의 연구내용을 기술하였다. 즉, 정밀 제어에 영향을 미치는 피에조의 히스테리시스를 포함한 개루프 특성을 모델링하고, 컴퓨터 시뮬레이션으로 액추에이터의 동작을 검증한 후 PID제어기를 적용하여, 이에 따른 결과와 함께 제어기를 제작하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11c
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• pp.2395-2398
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• 2002

국내의 반도체산업의 비약적인 발전과 함께 반도체 장비의 국산화에 대한 시도가 점차로 확산되어 가고있다. 최근 일본의 수입장비에만 의존하던 웨이퍼 테이프 마운터 (Wafer Tape Mounter) 장비가 국산화됨으로써 원가절감에 크게 기여하였다. 본 논문에서는 국산 웨이퍼 테이프 마운터 장비의 동작을 제어하는 운영 소프트웨어에 대해서 기술한다. PLC 기반의 기존 외국 장비와는 달리 국산 장비는 PC 기반으로 동작함으로써, 제어 소프트웨어의 역할이 훨씬 커지게 되었고, 기능의 추가 변경이 용이한 점이 장점이다. 소프트웨어는 여러개의 장치 (모터 등)을 동시에 구동하기 위한 효과적인 멀티스레딩 구조를 갖는다. 우리의 조사에 따르면, PC기반 웨이퍼 테이프 마운터의 제어 소프트웨어에 대한 연구는 거의 발표된 적이 없었다.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.4
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• pp.317-324
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• 2004

The ink jet printer media advance system is required to be exactly driven to the target position via tracking the reference velocity profile to obtain the high quality print image. A single gain PID controller is not sufficient to fulfill the control objectives, the exact velocity tracking and the accurate positioning, at the same time. A dual PID controller and its switching strategy are presented in this paper to achieve the control objectives. The media advance system is controlled by two separate PID controllers, one of which is for velocity control, and the other is for position control. A PID controller controls the velocity of the media advance system until it reaches the predetermined switching position. When the media advance system passes the predetermined position, the controller is switched to the other PID controller which is more profitable for exact positioning. The switching position is determined by the estimated stop distance. The simulation and experimental results are presented to show the validity and effectiveness of the proposed controller.