Stiffness Analysis of a Novel Flexible Positioning Mechanism for Large-aperture Grating Tiling

doi:10.3901/JME.2018.13.117

Abstract

Abstract: In order to meet the requirements such as large stroke, large load capacity, high precision and high stability for large-aperture grating tiling mechanism, a novel 5-DOF grating tiling flexible parallel mechanism based on orthogonal structure is proposed. The mechanism uses the structure layout of three orthogonal planes and single point supporting, suitable for high stiffness and large load capacity. And, it has the advantage of structural simplicity, high motion precision and high stability. Because the stiffness of the mechanism directly affects the motion accuracy, load capacity and stability, the stiffness model of the mechanism is obtained through combining unit stiffness matrix and matrix displacement method, according to the special structure of the grating tiling flexible mechanism. Finally, the result of theoretical stiffness model is compared with the finite element analysis based on ANSYS. The comparative result shows that the theoretical values and simulated values are anastomose essentially. The validity of the theoretical model is verified. It provides a reliable theoretical basis for the stiffness configuration and the optimization design of the mechanism.

Key words: complaint parallel mechanism, grating tiling, matrix displacement method, stiffness model

CLC Number:

TP242

SHAO Zhongxi, WU Shilei, FU Hongya. Stiffness Analysis of a Novel Flexible Positioning Mechanism for Large-aperture Grating Tiling[J]. Journal of Mechanical Engineering, 2018, 54(13): 117-125.

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