Showing items related by title, author, creator and subject.

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  The effects of postural drainage, manual percussion and vibration versus postural drainage and mechanical vibration on maximal expiratory flows

  Hartsell, Marilyn Burke (The University of Arizona., 1978)
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  Vibrations in MagAO: frequency-based analysis of on-sky data, resonance sources identification, and future challenges in vibrations mitigation

  Zúñiga, Sebastián; Garcés, Javier; Close, Laird M.; Males, Jared R.; Morzinski, Katie M.; Escárate, Pedro; Castro, Mario; Marchioni, José; Zagals, Diego; Univ Arizona, Dept Astron, CAAO; et al. (SPIE-INT SOC OPTICAL ENGINEERING, 2016-07-27)

  Frequency-based analysis and comparisons of tip-tilt on-sky data registered with 6.5 Magellan Telescope Adaptive Optics (MagAO) system on April and Oct 2014 was performed. Twelve tests are conducted under different operation conditions in order to observe the influence of system instrumentation (such as fans, pumps and louvers). Vibration peaks can be detected, power spectral densities (PSDs) are presented to reveal their presence. Instrumentation-induced resonances, close-loop gain and future challenges in vibrations mitigation techniques are discussed.
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  SHOCK & VIBRATION TESTING OF AN AIRBORNE INSTRUMENTATION DIGITAL RECORDER

  Smedley, Mark; Simpson, Gary; Naval Air Warfare Center Aircraft Division; Metrum-Datatape Inc. (International Foundation for Telemetering, 2000-10)

  Shock and vibration testing was performed on the Metrum-Datatape Inc. 32HE recorder to determine its viability as an airborne instrumentation recorder. A secondary goal of the testing was to characterize the recorder operational shock and vibration envelope. Both flight testing and laboratory environmental testing of the recorder was performed to make these determinations. This paper addresses the laboratory portion of the shock and vibration testing and addresses the test methodology and rationale, test set-up, results, challenges, and lessons learned.