Design of a flexure mount for optics in dynamic and cryogenic environments
AuthorPollard, Lloyd Wayne, 1936-
KeywordsLens mounts -- Design and construction.
Orbiting astronomical observatories -- Design and construction.
Astronomical instruments -- Design and construction.
Infrared telescopes -- Design and construction.
AdvisorRichard, Ralph M.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractThe design of the flexure mount recently submitted to NASA Ames for the structural support of the primary mirror of the Space Infrared Telescope Facility (SIRTF) is presented. The flexure system must passively accommodate the differential thermal contraction between the glass mirror and the aluminum structure of the telescope during cryogenic cooldown. Further, it must support the one meter diameter, 116 kilogram (258 pound) primary mirror during a severe launch to orbit. Procedures used to establish the required radial compliance using computer programs NASTRAN and FRINGE are discussed. The parametric design program developed to study early concepts is presented. Methods of combining modal responses resulting from a displacement response spectrum analysis are discussed, and a combination scheme called MRSS, Modified Root of Sum of Squares, is presented. Modal combination schemes using MRSS, SRSS, and ABS are compared to the results of a Modal Frequency Response analysis.
Degree ProgramGraduate College
Civil Engineering and Engineering Mechanics
Degree GrantorUniversity of Arizona
Showing items related by title, author, creator and subject.
Topographical design of the message domain pharmacophore of the delta opioid agonists using designer amino acids and design of non-peptide ligand for opioid receptors.Qian, Xinhua.; Hruby, Victor J.; Glass, Richard S.; Mash, Eugene A. Jr.; Martin, Arnold R.; Burke, Michael F. (The University of Arizona., 1995)A series of highly constrained tyrosine derivatives, 2',6'-dimethyl- β-methyltyrosines (TMTs), was designed and asymmetrically synthesized. Incorporation of the TMT isomers into peptide agonists of δ opioid receptors provide analogues that are highly potent and selectively for δ opioid receptors and have revealed the stereochemical requirements for recognizing opioid δ receptors. Moreover, the combination of conformational studies and pharmacological studies of the peptide analogues provided for the first time the stereochemical requirements for specifically recognizing opioid δ receptor subtypes. The biological active conformation of a highly selective and potent δ opioid agonist, ((2S,3R)-TMT¹) DPDPE, was obtained by NMR studies and computer-assisted modeling. This conformation was then further used for designing novel non-peptide opioid ligands. Thus, this study is another achievement of topographical design of peptide hormones and neurotransmitters. Practically, the results of this study can be used to develop more biological stable pharmaceuticals as strong pain reliever without causing side effects such as physical dependence, respiratory depression, etc.
A semantics-based methodology for integrated distributed database design: Toward combined logical and fragmentation design and design automation.Garcia, Hong-Mei Chen.; Liu Sheng, Olivia R.; Purdin, Titus D. M.; Chen, Hsinchun; Martinez, Ralph (The University of Arizona., 1992)The many advantages of Distributed Database (DDB) systems can only be achieved through proper DDB designs. Since designing a DDB is very difficult and expert designers are relatively few in number, "good" DDB design methodologies and associated computer-aided design tools are needed to help designers cope with design complexity and improve their productivity. Unfortunately, previous DDB design research focused on solving subproblems of data distribution design in isolation. As a result, past research on a general DDB design methodology offered only methodological frameworks that, at best, aggregate a set of non-integrated design techniques. The conventional separation of logical design from fragmentation design is problematic, but has not been fully analyzed. This dissertation presents the SEER-DTS methodology developed for the purposes of overcoming the methodological inadequacies of conventional design methodologies, resolving the DDB design problem in an integrated manner and facilitating design automation. It is based on a static semantic data model, SEER (Synthesized Extended Entity-Relationship Model) and a dynamic data model, DTS (Distributed Transaction Scheme), which together provide complete and consistent modeling mechanisms for acquiring/representing DDB design inputs and facilitating DDB schema design. In this methodology, requirement/distribution analysis and conceptual design are integrated and logical and fragmentation designs are combined. "Semantics-based" design techniques have been developed to allow for end-user design specifications and seamless design schema transformations, thereby simplifying design tasks. Towards our ultimate goal of design automation, an architectural framework for a computer-aided DDB design system, Auto-DDB, was formulated and the system was prototyped. As part of the developmental effort, a real-world DDB design case study was conducted to verify the applicability of the SEER-DTS methodology in a manual design mode. The results of a laboratory experiment showed that the SEER-DTS methodology produced better design outcomes (in terms of design effectiveness and efficiency) than a Conventional Best methodology performed by non-expert designers in an automated design mode. However, no statistically significant difference was found in user-perceived ease of use.
Planning and design of the urban park: A study of use patterns at Fort Lowell Park and the creation of new design guidelines for park development in Tucson, ArizonaGimblett, Randy; Longaker, Robert George (The University of Arizona., 1999)This thesis will study Fort Lowell Park, a typical district park in Tucson, Arizona. Through a survey of park users, the park itself will be assessed according to its positive and negative aspects. The survey itself will seek to capture the thoughts, beliefs, and recreational needs of the typical park user in Tucson. Through the compilation and interpretation of survey results, and with the assistance of case studies involving cities investing in parks and open spaces, the author of this thesis expects to produce new guidelines not only for the improvement of Fort Lowell Park, but also for the planning and design of new urban parks in the Tucson metropolitan area. These new guidelines will not only improve the quality of recreational experiences in the City of Tucson, but will also contribute to the economic, social, and quality of life variables which make a city an attractive place in which to live.