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Proceedings Paper

Testing, characterization, and control of a multi-axis, high precision drive system for the Hobby-Eberly Telescope Wide Field Upgrade
Author(s): Ian M. Soukup; Joseph H. Beno; Gary J. Hill; John M. Good; Charles E. Penney; Timothy A. Beets; Jorge D. Esguerra; Richard J. Hayes; James T. Heisler; Joseph J. Zierer; Gregory A. Wedeking; Michael S. Worthington; Douglas R. Wardell; John A. Booth; Mark E. Cornell; Marc D. Rafal
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Paper Abstract

A multi-axis, high precision drive system has been designed and developed for the Wide Field Upgrade to the Hobby- Eberly Telescope at McDonald Observatory. Design, performance and controls details will be of interest to designers of large scale, high precision robotic motion devices. The drive system positions the 20-ton star tracker to a precision of less than 5 microns along each axis and is capable of 4 meters of X/Y travel, 0.3 meters of hexapod actuator travel, and 46 degrees of rho rotation. The positioning accuracy of the new drive system is achieved through the use of highprecision drive hardware in addition to a meticulously tuned high-precision controller. A comprehensive understanding of the drive structure, disturbances, and drive behavior was necessary to develop the high-precision controller. Thorough testing has characterized manufacture defects, structural deflections, sensor error, and other parametric uncertainty. Positioning control through predictive algorithms that analytically compensate for measured disturbances has been developed as a result of drive testing and characterization. The drive structure and drive dynamics are described as well as key results discovered from testing and modeling. Controller techniques and development of the predictive algorithms are discussed. Performance results are included, illustrating recent performance of several axes of the drive system. This paper describes testing that occurred at the Center for Electromechanics in Austin Texas.

Paper Details

Date Published: 17 September 2012
PDF: 12 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84443X (17 September 2012); doi: 10.1117/12.926389
Show Author Affiliations
Ian M. Soukup, The Univ. of Texas Ctr. for Electromechanics (United States)
Joseph H. Beno, The Univ. of Texas Ctr. for Electromechanics (United States)
Gary J. Hill, The Univ. of Texas McDonald Observatory (United States)
John M. Good, The Univ. of Texas McDonald Observatory (United States)
Charles E. Penney, The Univ. of Texas Ctr. for Electromechanics (United States)
Timothy A. Beets, The Univ. of Texas Ctr. for Electromechanics (United States)
Jorge D. Esguerra, The Univ. of Texas Ctr. for Electromechanics (United States)
Richard J. Hayes, The Univ. of Texas Ctr. for Electromechanics (United States)
James T. Heisler, The Univ. of Texas Ctr. for Electromechanics (United States)
Joseph J. Zierer, The Univ. of Texas Ctr. for Electromechanics (United States)
Gregory A. Wedeking, The Univ. of Texas Ctr. for Electromechanics (United States)
Michael S. Worthington, The Univ. of Texas Ctr. for Electromechanics (United States)
Douglas R. Wardell, The Univ. of Texas Ctr. for Electromechanics (United States)
John A. Booth, The Univ. of Texas McDonald Observatory (United States)
Mark E. Cornell, The Univ. of Texas McDonald Observatory (United States)
Marc D. Rafal, The Univ. of Texas McDonald Observatory (United States)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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