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Feature Analysis and Experimental Research for Flexible Hinges Applied to Micro-Displacement Mechanism

Author: ZhuMing
Tutor: WangWeiYing
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Design and Theory
Keywords: flexible hinges buckling critical load finite element analysis reliability stiffness
CLC: TH112.1
Type: Master's thesis
Year: 2011
Downloads: 74
Quote: 1
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Abstract


Research of collapse and stiffness for flexible hinges in a micro-displacement mechanism are accomplished through the combination of theoretical, simulation and experiment, in order to overcome the difficulties in the traditional method.Based on the Rayleigh-Ritz method mentioned in the principles of energy, a mechanical model of critical buckling force is established for the computation of critical force for parallel four–bar flexible hinge mechanism, which is composed of right-angle-notch flexible hinges. The related formula is derived, while the length of flexible hinge is considered. Castiglione theorem is applied to the derivation of flexibility for hyperbola and ellipse flexible hinge. And theoretical expressions for mechanism, which is composed of static stiffness in right-angle-notch flexible hinges and parallel four–bar flexible ellipse hinge, are given depending on Pseudo-rigid-body model method.Right-angle-notch flexible hinges and parallel four–bar flexible hinge mechanism are analyzed for buckling using finite element software, including the eigenvalue buckling analysis and nonlinear buckling analysis. Flexiblity is calculated for hyperbola flexible hinge and ellipse respectively. Static stiffness is calculated for right-angle-notch flexible hinges and parallel four–bar flexible ellipse hinge mechanism.We produced a Right-angle-notch flexible hinges and parallel four–bar flexible hinge, and designed an experimental device. Buckling and stiffness were carried out by experiment, and related measurement data were obtained. The accuracy of mechanical model and derived formula are proved by comparison of the theoretical data, the data of the finite element simulation and experimental data related by the analysis of buckling and stiffness with different sizes parameter configurations.

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