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dc.creatorMollison, N.T.en
dc.creatorMock, J.Ren
dc.creatorSoukup, I.Men
dc.creatorBeets, T.Aen
dc.creatorGood, J.Men
dc.creatorBeno, J.Hen
dc.creatorKriel, H.Jen
dc.creatorHinze, S.Een
dc.creatorWardell, D.Ren
dc.creatorHeisler, J.T.en
dc.date.accessioned2016-02-09T22:07:48Zen
dc.date.available2016-02-09T22:07:48Zen
dc.date.issued2010-07en
dc.identifierPN_343en
dc.identifierdoi:10.15781/T2468Den
dc.identifier.citationN.T. Mollison, J.R. Mock, I.M. Soukup, T.A. Beets, J.M. Good, J.H. Beno, H.J. Kriel, S.E. Hinze, D.R. Wardell, and J.T. Heisler, “Design and development of a long-travel positioning actuator and tandem constant force actuator safety system for the Hobby Eberly Telescope Wide Field Upgrade,” paper no. 7733-150, Proc. SPIE Astronomical Telescopes and Instrumentation, San Diego, CA, USA, June 27 to July 2, 2010.en
dc.identifier.urihttp://hdl.handle.net/2152/33143en
dc.description.abstractThe Wide Field Upgrade presents a five-fold increase in mass for the Hobby-Eberly Telescope's* tracker system. The design of the Hobby-Eberly Telescope places the Prime Focus Instrument Package (PFIP) at a thirty-five degree angle from horizontal. The PFIP and its associated hardware have historically been positioned along this uphill axis (referred to as the telescope's Y-axis) by a single screw-type actuator. Several factors, including increased payload mass and design for minimal light obscuration, have led to the design of a new and novel configuration for the Y-axis screw-drive as part of the tracker system upgrade. Typical screw-drive designs in this load and travel class (approximately 50 kilonewtons traveling a distance of 4 meters) utilize a stationary screw with the payload translating with the moving nut component. The new configuration employs a stationary nut and translating roller screw affixed to the moving payload, resulting in a unique drive system design. Additionally, a second cable-actuated servo drive (adapted from a system currently in use on the Southern African Large Telescope) will operate in tandem with the screw-drive in order to significantly improve telescope safety through the presence of redundant load-bearing systems. Details of the mechanical design, analysis, and topology of each servo drive system are presented in this paper, along with discussion of the issues such a configuration presents in the areas of controls, operational and failure modes, and positioning accuracy. Findings and results from investigations of alternative telescope safety systems, including deformable crash barriers, are also included.en
dc.language.isoenen
dc.relation.ispartofCEM Publicationsen
dc.subjectRotating Machine EM Launchen
dc.subjectCenter for Electromechanicsen
dc.subjectHobby-Eberly Telescopeen
dc.subjectHETDEXen
dc.subjectUniversity of Texasen
dc.subjecttelescope safety, precision positioning systemsen
dc.subjectactuatorsen
dc.titleDesign and development of a long-travel positioning actuator and tandem constant force actuator safety system for the Hobby Eberly Telescope Wide Field Upgradeen
dc.typeconference paperen
dc.description.departmentCenter for Electromechanicsen
dc.rights.restrictionopenen


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