Friction model of the 2.5mts SDSS telescope

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Description

The 2.5mts telescope designed for the Sloan Digital Sky Survey (SDSS) is a mechanical structure that presents five degree-of-freedom. Azimuth, altitude and the instrument rotator axis are fitted with servo controls. The low frequency dynamic are dominated by the bearing friction. Several mathematical models have been presented in the literature to include its effect into the dynamic model of mechanical structures. The model employed in this paper includes consideration of the Striebeck effect, dynamic behavior at very low velocities and the pre-sliding at near zero-velocity. Results of the parameter estimation of the friction model of the three principal axes are ... continued below

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14 p.

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Rivetta, Claudio H. & Hansen, Sten February 1, 1998.

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Description

The 2.5mts telescope designed for the Sloan Digital Sky Survey (SDSS) is a mechanical structure that presents five degree-of-freedom. Azimuth, altitude and the instrument rotator axis are fitted with servo controls. The low frequency dynamic are dominated by the bearing friction. Several mathematical models have been presented in the literature to include its effect into the dynamic model of mechanical structures. The model employed in this paper includes consideration of the Striebeck effect, dynamic behavior at very low velocities and the pre-sliding at near zero-velocity. Results of the parameter estimation of the friction model of the three principal axes are presented as well as the behavior of the structure when different torque stimuli are applied. The mathematical model used to include the friction phenomena into the telescope dynamic model is simple. It does a good job of describing the friction over a wide range of velocities but particularly at or below siderial rate. It is a straight forward process to determine the parameters and, in simulations, does not require large amounts of computer time. 10 refs. , 8 figs.

Physical Description

14 p.

Notes

OSTI as DE98052615

Other: FDE: PDF; PL:

Source

  • SPIE international symposium on astronomical telescopes and instrumentation, Kona, HI (United States), 20-28 Mar 1998

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  • Other: DE98052615
  • Report No.: FNAL/C--98/070
  • Report No.: CONF-980349--
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/598758 | External Link
  • Office of Scientific & Technical Information Report Number: 598758
  • Archival Resource Key: ark:/67531/metadc692495

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  • February 1, 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 10, 2017, 1:39 p.m.

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Rivetta, Claudio H. & Hansen, Sten. Friction model of the 2.5mts SDSS telescope, report, February 1, 1998; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc692495/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.