• Transactions of the Korean Society of Mechanical Engineers A
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• v.29 no.7 s.238
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• pp.955-963
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• 2005

This research investigates dynamic characteristics of a linear motion (LM) guide through a experimental result and theoretical analysis. The stiffness in the LM guide is determined by the preloading due to the minus clearance between the ball bearing and the contact surface and it can be derived by Hertzian contact theory and the nonlinear motion of equation. The vibration analysis is performed using Lagrange equations and its result agrees with the experiment result. Using the sensitivity analysis on design parameters such as the contact angles of ball bearings and the eccentricity of mass center, the variation of the natural frequencies can be predicted.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.659-661
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• 2022

본 논문에서는 4차 산업의 제조 혁신을 위한 새로운 방안의 스마트 팩토리를 실헌하기 위한 주요 부품 중에 하나인 리니어 모션 가이드(LM 가이드)에 필요한 센싱 시스템을 제안하였다. 공장 자동화와 정밀 측의 핵심 부품인 LM 가이드를 고정밀, 고정도로 제어할 수 있는 변위 센싱 시스템의 개발이다. 기존의 광학식이나 자기식 변위 센서 기술의 한계를 극복할 수 있도록 와전류(Eddy Current) 기법을 이용하여 LC 공진기와 전도체를 LM 가이드에 장착할 수 있도록 제안하였다. 또한 와전류 센싱부에서 출력되는 미세 인덕턴스 값을 측정할 수 있도록 디지털 신호처리 기술과 컴퓨터/산술 기술을 FPGA를 이용한 HW 시스템을 제작하여 다양한 실험을 진행했다. 본 논문에서 구현한 HW 센싱 시스템을 이용함으로 LM 가이드를 실시간으로 직선 이동시킴으로 실시간으로 변위 값을 디스플레이 부로 출력되어 측정이 가능하다. 개발된 시스템은 LM 가이드의 직선 운동시 변위 값의 분해능과 응답속도 면에서 우수함이 확인됨으로 스마트 팩토리 뿐만 아니라 다양한 장비에도 적용이 가능하다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.463-464
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.527-528
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• 2010

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.332-336
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• 2004

To position precision machines accurately, linear motion (LM) guides having rolling elements can be used. For ultra-accurate positioning control of the precision machines, the understanding of the dynamic behavior of the LM guide at the macro and/or micro scales is most critical, but the research on this subject is rare. The objective of the present research is to observe the vibration phenomena of the LM guide. Bails are used as the rolling elements in this work. Several experiments show the nonlinear characteristics of the LM guide such as hysteresis behavior and force-dependent natural frequencies phenomena.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.14 no.10
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• pp.1029-1034
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• 2004

Linear motion ( LM) guides having rolling elements have been used to position precision machines accurately. For ultra-accurate Positioning control of Precision machines, the understanding of the dynamic behavior of the LM guide at the macro and/or micro scales is most critical, but the research on this subject is rare. The objective of the present research is to investigate the vibration phenomena of the LM guide where balls are used as the rolling elements. Several experiments show the nonlinear characteristics of the LM guide such as hysteresis behavior and force-dependent natural frequencies phenomena.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.794-797
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• 2001

The basic design of today s rolling linear guides with rails is outlined in a French patent from 1932, it was not until the early 1970s that linear guides were commercialized. Progress with the numerical control of machine tools led to higher speed and accuracy of machines that exposed limitations of conventional sliding guides in terms of durability and response capability. As a result, rolling guides, having better high-speed performance and greater compatibility with electronics, began to be used widely. This paper examined theoretically and experimentally the influence of rail bolt tightening on the motion accuracy of linear guides. The rail of a linear guide is tightened and fixed to the base component by bolts. Naturally, the rail is an elastic body and the compression force generated by tightening the volts causes its deflection. Compromising motion accuracy, the rail deforms wavily in a longitudinal direction corresponding to the bolt pitch. The relation between rail position and deflection(sinking) amount caused by bolt tightening was analyzed through FEM analysis in this paper.

• Journal of the Korean Society of Mechanical Technology
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• v.13 no.1
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• pp.95-103
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• 2011

Robots in various types carry and assemble parts through repeatedly and accurately moving to stored locations by combining linear motions. And, linear systems are used in orthogonal axes of robots and driven via ball screws, such as 2-axis cartesian coordinate robot in this paper. This paper presents the effect of the linear motion guide that is used in $2^{nd}$ axis in 2-axis cartesian coordinate robot. Some simulation results show that the linear motion guide influence greatly in robot performance such as the nominal life of linear guide. When use LM guide that have capacity near in $2^{nd}$ axis, this paper show that the nominal life on LM block of $1^{st}$ axis increases 37.4% and that the specification of $2^{nd}$ axis LM guide influences greatly the nominal life of $1^{st}$ axis LM block.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1995.04a
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• pp.252-257
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• 1995

전자기력을 이용한 능동 진동제어는 1979년 Ellis 및 Mote가 원형 톱의 횡 진동의 감쇠에 관한 연구를 수행하였고, 1990년 Hong Su 및 T.S.Sankar등은 시스템의 절대 위치, 절대 속도 및 상대 위치 등의 제어 변수에 대하여 전자기 액튜에이터의 동적 특성이 진동 절연 성능에 미치는 영향에 관한 연구를 하였다. 본 연구는 상부질량과 하부질량이 스프링으로 연결된 2자유도 모델의 능동 진동제어에 대하여 이론해석과 실험해석을 수행하고 각각의 결과를 비교하였다. 실험모델은 직선운동 가이드에 설치된 2개의 질량과 하나의 전자기 액튜에이터를 이용하였다. 진동제어 방법으로서는 모우드 해석에 의한 제어, 스카이 훅 감쇠 제어, Viscous damping 제어 방법을 적용하였다. 본 연구의 목적은 이론해석 결과와 실험 결과를 비교하고 비슷한 제어효과에 대해서 에너지 소비가 작은 효율적인 제어방법을 찾는데 있다.

• Journal of Bio-Environment Control
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• v.9 no.4
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• pp.237-243
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• 2000

Agricultural machine is currently operated by man power in the greenhouse, which is oppressively hot and humid, and is for a farmer not to work in comfortable circumstances. In the future, agricultural machine will not have to operate by man power, but it will need do by unmanned power. In order to put into the automatic and unmanned operation of agricultural machine, this system was designed and built to move through the fixed path in the greenhouse. This system was composed of guiders(wires), a limit switch, an operating equipment, its software for automatizing a machine in the greenhouse. The guider was connected between the wall pillars, and the equipment was able to slide over the fixed path made of the guider, by rectilinear and rotational motion. A micro mouse was developed with a stepping motor to calculate on the success rate of its operation with the system As might be expected, this system with the micro mouse was moved the moved the paths with a success rate of 100% on the flat plane surface in our laboratory. However, on the sand plane or the other materials plane, the success rate was not better than 80%. If the micro mouse were well operated, the success rate was would be 100%. Based on the results of this research, this system would be expected to operate well on the path made of a simple wire.