Large stroke high off-axis stiffness three degree of freedom spherical flexure joint

M. Naves (Corresponding Author), R.G.K.M. Aarts, D.M. Brouwer

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Three degree of freedom spherical flexure joints are typically limited to small deflections because of their strong loss of stiffness in support directions when deflected. In this paper, a smartly stacked folded leafspring based large stroke spherical flexure joint is presented which can maintain a high level of support stiffness over a ±30 degrees tip-tilt and a ±10 degrees pan motion. To enable this large range of motion, two sets of three leafsprings are stacked in series. A large loss of support stiffness over the range of motion due to the underconstrained intermediate body is avoided by assuring that the instant centers of rotation coincide. To mitigate internal dynamics caused by the underconstraints, a design with underconstraint eliminators and a design with eddy current damping are presented. Furthermore, the design of the spherical joint has been optimized which has resulted in a flexure joint design which can achieve a support stiffness of over 200 N/mm and a load capacity of 290 N at the maximum deflection angle. Experimental measurements validate the high level of support stiffness and load capacity over the entire range of motion.

Original languageEnglish
Pages (from-to)422-431
Number of pages10
JournalPrecision engineering
Volume56
DOIs
Publication statusPublished - 1 Mar 2019

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Degrees of freedom (mechanics)
Stiffness
Loads (forces)
Eddy currents
Damping

Keywords

  • Compliant mechanism
  • Flexure mechanism
  • Large stroke
  • Spherical joint

Cite this

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abstract = "Three degree of freedom spherical flexure joints are typically limited to small deflections because of their strong loss of stiffness in support directions when deflected. In this paper, a smartly stacked folded leafspring based large stroke spherical flexure joint is presented which can maintain a high level of support stiffness over a ±30 degrees tip-tilt and a ±10 degrees pan motion. To enable this large range of motion, two sets of three leafsprings are stacked in series. A large loss of support stiffness over the range of motion due to the underconstrained intermediate body is avoided by assuring that the instant centers of rotation coincide. To mitigate internal dynamics caused by the underconstraints, a design with underconstraint eliminators and a design with eddy current damping are presented. Furthermore, the design of the spherical joint has been optimized which has resulted in a flexure joint design which can achieve a support stiffness of over 200 N/mm and a load capacity of 290 N at the maximum deflection angle. Experimental measurements validate the high level of support stiffness and load capacity over the entire range of motion.",
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Large stroke high off-axis stiffness three degree of freedom spherical flexure joint. / Naves, M. (Corresponding Author); Aarts, R.G.K.M.; Brouwer, D.M.

In: Precision engineering, Vol. 56, 01.03.2019, p. 422-431.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Naves, M.

AU - Aarts, R.G.K.M.

AU - Brouwer, D.M.

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N2 - Three degree of freedom spherical flexure joints are typically limited to small deflections because of their strong loss of stiffness in support directions when deflected. In this paper, a smartly stacked folded leafspring based large stroke spherical flexure joint is presented which can maintain a high level of support stiffness over a ±30 degrees tip-tilt and a ±10 degrees pan motion. To enable this large range of motion, two sets of three leafsprings are stacked in series. A large loss of support stiffness over the range of motion due to the underconstrained intermediate body is avoided by assuring that the instant centers of rotation coincide. To mitigate internal dynamics caused by the underconstraints, a design with underconstraint eliminators and a design with eddy current damping are presented. Furthermore, the design of the spherical joint has been optimized which has resulted in a flexure joint design which can achieve a support stiffness of over 200 N/mm and a load capacity of 290 N at the maximum deflection angle. Experimental measurements validate the high level of support stiffness and load capacity over the entire range of motion.

AB - Three degree of freedom spherical flexure joints are typically limited to small deflections because of their strong loss of stiffness in support directions when deflected. In this paper, a smartly stacked folded leafspring based large stroke spherical flexure joint is presented which can maintain a high level of support stiffness over a ±30 degrees tip-tilt and a ±10 degrees pan motion. To enable this large range of motion, two sets of three leafsprings are stacked in series. A large loss of support stiffness over the range of motion due to the underconstrained intermediate body is avoided by assuring that the instant centers of rotation coincide. To mitigate internal dynamics caused by the underconstraints, a design with underconstraint eliminators and a design with eddy current damping are presented. Furthermore, the design of the spherical joint has been optimized which has resulted in a flexure joint design which can achieve a support stiffness of over 200 N/mm and a load capacity of 290 N at the maximum deflection angle. Experimental measurements validate the high level of support stiffness and load capacity over the entire range of motion.

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