Friction-based design of kinematic couplings

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Friction affects several aspects important to the design of kinematic couplings, but particularly the ability to reach its centered position is fundamental (In this paper, the term kinematic coupling refers to any connection device based on pairs of contacting surfaces that provide six constraints in an ideal sense). It becomes centered when all pairs of contacting surfaces are fully seated even though a small uncertainty may exist about the exact center where potential energy is minimum. For many applications, centering ability is a good indicator for optimizing the coupling design. Typically, the coupling design process has been largely heuristic based ... continued below

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565 Kilobytes

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Hale, L C July 30, 1998.

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Description

Friction affects several aspects important to the design of kinematic couplings, but particularly the ability to reach its centered position is fundamental (In this paper, the term kinematic coupling refers to any connection device based on pairs of contacting surfaces that provide six constraints in an ideal sense). It becomes centered when all pairs of contacting surfaces are fully seated even though a small uncertainty may exist about the exact center where potential energy is minimum. For many applications, centering ability is a good indicator for optimizing the coupling design. Typically, the coupling design process has been largely heuristic based on a few guidelines [Slocum, 1992]. Several simple kinematic couplings (for example, a symmetric three-vee coupling) are compared for centering ability using closed-form equations. More general configurations lacking obvious symmetries are difficult to model in this way. A unique kinematic coupling for large interchangeable optics assemblies in the National Ignition Facility motivated the development of a computer program to optimize centering ability. However, space limits the description of the program to the basic algorithm. Currently the program is written in MathcadTM Plus 6 and is available upon request.

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565 Kilobytes

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  • American Society for Precision Engineering 13th Annual Meeting, St. Louis, MO, October 25-30, 1998

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  • Other: DE00007820
  • Report No.: UCRL-JC-131297
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 7820
  • Archival Resource Key: ark:/67531/metadc724459

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  • July 30, 1998

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 11:19 p.m.

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Hale, L C. Friction-based design of kinematic couplings, article, July 30, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc724459/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.