Dynamic analysis of six-axis Stewart platform using flexible joints

Furqan, Mohd; Suhaib, Mohd; Ahmad, N.

doi:10.1504/ijmrs.2018.10017194

Cited by 2 publications

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“…An RCCS flexural joint [ 32 , 33 , 34 , 35 , 36 ] is shown in Figure 1 a. The ratio of the minimum cross-sectional diameter t -min of the compliant joint to the maximum cross-sectional diameter t -max is less than or equal to 1/10, and the distance of the joint between ends is 2r.…”

Section: Analysis Of the Compliant Spherical Joint Based On Screw mentioning

confidence: 99%

Design and DOF Analysis of a Novel Compliant Parallel Mechanism for Large Load

Zhang

et al. 2019

Sensors

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The degree of freedom (DOF) and motion characteristics of a kind of compliant spherical joint were analyzed based on the screw theory, and a new design scheme for force-inversion of the compliant spherical joint was proposed in this paper. A novel type of six DOF compliant parallel mechanism (CPM) was designed based on this scheme to provide a large load capacity and achieve micrometer-level positioning accuracy. The compliance matrix of the new type of CPM was obtained through matrix transformation and was then decomposed into its generalized eigenvalues. Then, the DOF of the mechanism was numerically analyzed based on the symbolic formulation. The finite element analysis model of the compliant parallel mechanism was established. The static load analysis was used to verify the large load capacity of the mobile platform. By comparing the deformation obtained by the compliance matrix numerical method with the deformation obtained by the finite element method, the correctness of the compliance matrix and the number of the DOF of the CPM was verified.

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Section: Analysis Of the Compliant Spherical Joint Based On Screw mentioning

confidence: 99%

Design and DOF Analysis of a Novel Compliant Parallel Mechanism for Large Load

Zhang

et al. 2019

Sensors

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“…Nevertheless, it leads to the introduction of bending stresses in the system. Bending can be mitigated by tapering the struts at the ends, or by using flexible hinges [44,45]. However, this design strategy does not allow the fabrication of perfect hinges.…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of Bistable Lattices with Tensegrity Architecture and Nanoscale Features Fabricated by Multiphoton Lithography

2020

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A bistable response is an innate feature of tensegrity metamaterials, which is a conundrum to attain in other metamaterials, since it ushers unconventional static and dynamical mechanical behaviors. This paper investigates the design, modeling, fabrication and testing of bistable lattices with tensegrity architecture and nanoscale features. First, a method to design bistable lattices tessellating tensegrity units is formulated. The additive manufacturing of these structures is performed through multiphoton lithography, which enables the fabrication of microscale structures with nanoscale features and extremely high resolution. Different modular lattices, comprised of struts with 250 nm minimum radius, are tested under loading-unloading uniaxial compression nanoindentation tests. The compression tests confirmed the activation of the designed bistable twisting mechanism in the examined lattices, combined with a moderate viscoelastic response. The force-displacement plots of the 3D assemblies of bistable tensegrity prisms reveal a softening behavior during the loading from the primary stable configuration and a subsequent snapping event that drives the structure into a secondary stable configuration. The twisting mechanism that characterizes such a transition is preserved after unloading and during repeated loading-unloading cycles. The results of the present study elucidate that fabrication of multistable tensegrity lattices is highly feasible via multiphoton lithography and promulgates the fabrication of multi-cell tensegrity metamaterials with unprecedented static and dynamic responses.

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Dynamic analysis of six-axis Stewart platform using flexible joints

Cited by 2 publications

References 0 publications

Design and DOF Analysis of a Novel Compliant Parallel Mechanism for Large Load

Design and DOF Analysis of a Novel Compliant Parallel Mechanism for Large Load

Design and Testing of Bistable Lattices with Tensegrity Architecture and Nanoscale Features Fabricated by Multiphoton Lithography

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