http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Equivalent Stiffness Modeling of Linear Motion Guideways for Stage Systems
Jeong, Jongkyu,Kang, Eungoo,Jeong, Jayil 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.9
In this work, an 8-spring equivalent stiffness model for the linear motion (LM) guideways of a positioning stage system is studied. In the model, eight springs connect the LM block to the LM rail. The equivalent model can satisfy the static and dynamic characteristics of typical LM guideways. Based on a finite element model of an LM guideway, the static deflection and normal mode analysis of a 1-axis stage system is evaluated. The simulation results match the experimental results with more than 90% accuracy. The static deflection of a 3-axis stage is also tested. The deflection of the tool plate is measured by a coordinate measuring machine. The amount of deflection with respect to the location of the tool plate can be predicted within an error of approximately $4{\sim}6{\mu}m$.
Stiffness Enhancement of a Redundantly Actuated Parallel Machine Tool by Dual Support Rims
Shin, Hyunpyo,Kim, Sunho,Jeong, Jayil,Kim, Jongwon 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.9
A novel kinematic structure called as the Eclipse-IA is suggested for an application to the parallel machine tools. The stiffness enhancement design based on the Eclipse-IA structure is also introduced with its stiffness analysis for redundantly actuated parallel mechanisms. Relationship between the new structure and the stiffness properties including determinant and isotropy of the corresponding stiffness matrix is examined. Moreover, the design parameters are optimized to maximize the stiffness properties for the application of the Eclipse-IA as a multi-functional machine tool. By various simulation cases, the suggested parallel mechanism and the redundant actuation are verified to increase the stiffness properties against arbitrary external forces.