scholarly journals A multi-scale finite element analysis and sectional design approach for the creep of polymeric FRC

2019 ◽  
pp. 1415-1420
Author(s):  
Rutger Vrijdaghs ◽  
Lucie Vandewalle ◽  
M. di Prisco
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Approach ◽  
Element Analysis ◽  
Multi Scale

A 2-legged XY parallel flexure motion stage with minimised parasitic rotation

2014 ◽  
Vol 228 (17) ◽  
pp. 3156-3169 ◽  
Author(s):  
Guangbo Hao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Parallel Manipulator ◽  
Parallel Manipulators ◽  
Design Approach ◽  
Analytical Models ◽  
Geometrical Parameters ◽  
Element Analysis ◽  
Motion Range ◽  
Cross Axis

XY compliant parallel manipulators (aka XY parallel flexure motion stages) have been used as diverse applications such as atomic force microscope scanners due to their proved advantages such as eliminated backlash, reduced friction, reduced number of parts and monolithic configuration. This paper presents an innovative stiffness centre based approach to design a decoupled 2-legged XY compliant parallel manipulator in order to better minimise the inherent parasitic rotation and have a more compact configuration. This innovative design approach makes all of the stiffness centres, associated with the passive prismatic (P) modules, overlap at a point that all of the applied input forces can go through. A monolithic compact and decoupled XY compliant parallel manipulator with minimised parasitic rotation is then proposed using the proposed design approach based on a 2-PP kinematically decoupled translational parallel manipulator. Its load–displacement and motion range equations are derived, and geometrical parameters are determined for a specified motion range. Finite element analysis comparisons are also implemented to verify the analytical models with analysis of the performance characteristics including primary stiffness, cross-axis coupling, parasitic rotation, input and output motion difference and actuator nonisolation effect. Compared with the existing XY compliant parallel manipulators obtained using 4-legged mirror-symmetric constraint arrangement, the proposed XY compliant parallel manipulators based on stiffness centre approach mainly benefits from fewer legs resulting in reduced size, simpler modelling as well as smaller lost motion. Compared with existing 2-legged designs with the conventional arrangement, the present design has smaller parasitic rotation, which has been proved from the finite element analysis results.

An XY Nanopositioner With a Self-Adjusting Stiffness Center Module

2017 ◽  
Author(s):  
Zhiqing Liu ◽  
Zhen Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Approach ◽  
Element Analysis

This paper presents an innovative large stroke XY compliant nanopositioner with a self-adjusting stiffness center (SASC) module in order to minimize the in-plane parasitic rotation. Double parallelogram flexure is utilized to achieve kinematics decoupling. Moreover to realize SASC, an additional planar joint based on parallelogram flexure is adopted, which significantly reduces the in-plane moment. SASC design approach makes the stiffness center adjust by itself and stay fixed by the variation of the stiffness of parallelogram flexures when the stage is in motion. In a case study, a 1mm × 1 mm XY nanopositioner with a SASC module is presented in details. Finite element analysis (FEA) results show that the proposed XY positioner is capable to achieve the required millimeters stroke, and significantly reduces parasitic rotation with the SASC design.

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