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    Testing, characterization, and control of a multi-axis high precision drive system for the Hobby-Eberle Telescope Wide Field Upgrade

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    PN_358_Soukup_SPIE_8444-147.pdf (1.139Mb)
    Date
    2012-07
    Author
    Soukup, I.M.
    Beno, J.H
    Hill, G.H
    Good, J.M
    Penney, C.E
    Beets, T.A
    Esquerra, J.D
    Hayes, R.J
    Heisler, J.T
    Zierer, J.J
    Wedeking, G.A
    Worthington, M.S
    et. al.
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    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 high-precision 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.
    Department
    Center for Electromechanics
    Subject
    Rotating Machine EM Launch
    Center for Electromechanics
    CEM
    Hobby-Eberly Telescope
    HET
    HETDEX
    University of Texas
    McDonald Observatory
    Telescope tracking systems
    Large hexapod positioning systems
    High payload hexapod positioning systems
    precision positioning systems
    hexapod design and controls
    URI
    http://hdl.handle.net/2152/33151
    xmlui.dri2xhtml.METS-1.0.item-citation
    I.M. Soukup, J.H. Beno, G.H. Hill, J.M. Good, C.E.Penney, T.A. Beets, J.D. Esquerra, R.J. Hayes, J. T. Heisler, J.J.Zierer, Jr., G.A. Wedeking, M.S. Worthington, D.R. Wardell, J. A. Booth, M.E.Cornell, J. D. Rafal “Testing, characterization, and control of a multi-axis high precision drive system for the Hobby-Eberle Telescipe Dark Energy Experiment (HETDEX),” Proc. SPIE Astronomical Telescopes and Instrumentation, 8444-147, Amsterdam, Netherlands, July 1-6, 2012.
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    • CONTACT US
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    © The University of Texas at Austin