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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.
이호진(Hojin Lee),기원용(Wonyong Ki),정재일(Jayil Jeong),허승진(Seung-Jin Heo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The multi linkage mechanism needs numerous analysis and repetitive design processes to find the optimal design. Typically, parameter study is performed to find such design. However, this process demands more time during designing, and has a difficulty to meet many constraints. In order to mitigate this problem, this study instead applies the meta-model-based designing process to the multi linkage mechanism. The processes divide into three phases. The first phase is to create a base model of multi linkage mechanism. The second phase is to create generate a meta model. An experiment point is constructed based on the forty-four design variables and Latin Hyper Cube(LHC) Design of Experiments(DOE). The last phase is to find the optimal solution that meets constraints and objectives by using an optimization algorithm. This study also seeks robustness in optimization and design by considering each variable’s difference.