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Development of 3-axis Nano Stage for High Precision Positioning System
Hyoung Gil Choi(최형길),Moon Gu Lee(이문구),Suk-Won Lee(이석원),Dong-Ju Lee(이동주),Kang-Nyung Lee(이강녕),No-Cheol Park(박노철) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The precision positioning system requires robust structural design to obtain enough bandwidth and efficient magnetic circuit to have fast access time. In this paper, the 3-axis nano stage was proposed and dynamic characteristics was improved by design of experiments (DOE) based on specifications of our precision positioning device. Finally, it was checked that the designed actuator had the proper dynamic characteristics through dynamic experiments.
정승현(Seung-Hyun Chung),최형길(Hyoung Gil Choi),이장무(Jang Moo Lee),박춘기(Choonki Park),조성선(Sung Sun Cho),정인승(Inseung Chung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Damping shims are broadly used for the purpose of reducing the squeal noise of disc brake systems. Although the<br/> effects of the damping shims are well known practically, the analytical studies have not been carried out sufficiently.<br/> In this paper, we conducted the complex eigenvalue analysis of the finite element model of a brake system with<br/> several kinds of damping shims and investigated the effects of damping shims in variation of their material properties<br/> and contact conditions. Each damping shim was modeled as an equivalent single-layer instead of a multi-layered<br/> model. Also, noise dynamometer test were performed and the test results were in accordance with the analysis results.
이성혁(Seong Hyuk Lee),정순철(Soon Chul Jung),이재응(Jae Eung Lee),김혁(Hyuk Kim),최형길(Hyoung Gil Choi),류제형(Je Hyoung Ryu),이동진(Dong-Jin Lee),지홍규(Hong Kyu Ji) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The present study investigates the static and dynamic stiffness characteristics of porous air bearing which is mainly used for the ultra precision positioning machines. In this study, the static and dynamic stiffness of air bearing is measured with the accuracy of 1 ㎛. The permeability of porous medium is also estimated by comparing the predicted results with the experimental data for the static case. The numerical analysis is extensively conducted by using the commercial CFD code (FLUENT V6). In particular, the deforming and remeshing technique is adopted for solving the fluid-solid interaction problem. As a result, it is found that the predictions for the static stiffness show good agreement with experimental data when the appropriate permeability value is used and the dynamic stiffness appears to be relatively smaller than the static stiffness.