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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.
축소 시스템과 부구조화 기법에 기초한 대형 구조물 해석 기법 연구
김현기(Hyun-Gi Kim),백승민(Seung-Min Baek),최진복(Jin-Bok Choi),조맹효(Meang-Hyo Cho),김혁(Hyuk Kim),최형길(Hyoung-Gil Choi),최재락(Jae-Rack Choi) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
A number of approximate techniques have been proposed to calculate the eigenvalues in a reduced manner. These schemes approximate the lower eigenvalues that represent the global behavior of the structures. But, the reduction methods are not efficient to be applied to large scale problems. The selection of the primary degrees of freedom might be localized causing the excessive emphasis of the lower mode or lost of the important modes. Moreover, it takes considerable amount of computing time for the construction of the reduced system in large-scale problem. This paper proposes the reduced system combined with the sub-structuring scheme based on the primary degrees of freedom. For the construction of the final reduced system, the system of each domain subdivided into primary, slave and interface degrees of freedom It is remarkably efficient in computing time accurate compared to full-scale system. Numerical examples demonstrate that the proposed method saves computational cost effectively and provides a reduced system which predicts the accurate eigenpairs of global system.
축소 시스템과 부구조화 기법에 기초한 대형 구조물 해석 기법 연구
김현기(Hyun-Gi Kim),백승민(Seung-Min Baek),최진복(Jin-Bok Choi),조맹효(Meang-Hyo Cho),김혁(Hyuk Kim),최형길(Jae-Rack Choi),최재락(Hyoung-Gil Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A number of approximate techniques have been proposed to calculate the eigenvalues in a reduced manner. These schemes approximate the lower eigenvalues that represent the global behavior of the structures. But, the reduction methods are not efficient to be applied to large scale problems. The selection of the primary degrees of freedom might be localized causing the excessive emphasis of the lower mode or lost of the important modes. Moreover, it takes considerable amount of computing time for the construction of the reduced system in large-scale problem. This paper proposes the reduced system combined with the sub-structuring scheme based on the primary degrees of freedom. For the construction of the final reduced system, the system of each domain subdivided into primary, slave and interface degrees of freedom. It is remarkably efficient in computing time accurate compared to full-scale system. Numerical examples demonstrate that the proposed method saves computational cost effectively and provides a reduced system which predicts the accurate eigenpairs of global system.