A PARAMETRIC STUDY OF THE FREE VIBRATION CHARACTERISTICS OF ROTATING CANTILEVER BLADES.
AuthorMcGee, Oliver Gregory.
KeywordsTurbomachines -- Blades -- Data processing.
Turbomachines -- Vibration -- Data processing.
Turbomachines -- Vibration -- Mathematical models.
Vibration -- Data processing.
Vibration -- Mathematical models.
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.
Degree ProgramGraduate College
Degree GrantorUniversity of Arizona
Showing items related by title, author, creator and subject.
The effects of postural drainage, manual percussion and vibration versus postural drainage and mechanical vibration on maximal expiratory flowsHartsell, Marilyn Burke (The University of Arizona., 1978)
Vibrations in MagAO: frequency-based analysis of on-sky data, resonance sources identification, and future challenges in vibrations mitigationZúñiga, 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; Univ Arizona, Steward Observ; Univ. Técnica Federico Santa María (Chile); Univ. Técnica Federico Santa María (Chile); Univ. of Arizona (United States); Univ. of Arizona (United States); Univ. of Arizona (United States); Univ. Técnica Federico Santa María (Chile); Univ. Técnica Federico Santa María (Chile); Univ. Técnica Federico Santa María (Chile); Univ. Técnica Federico Santa María (Chile) (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.
Investigation of Molecular Structures and Ordering at Solid Liquid Interfaces Using Novel Emersion Vibrational SpectroscopyHeier, Shinobu Tsuruta (The University of Arizona., 2008)Molecular level understanding of solid-liquid interfaces in ambient condition is still a challenging, but exciting area. The work presented here demonstrates the effectiveness of emersion IRRAS as a new tool in our arsenal to expand our understanding of solid-liquid interfaces through the investigation of model solvent/organically modified interfaces and electrochemically relevant interfaces using novel emersion spectroscopy. The emersion approach effectively isolates the molecularly-thin emersed liquid layer under ambient conditions by physically removing bulk liquid from the interface. Without the interferences from bulk liquid, the emersed layer is accessible with conventional spectroscopic methods.In this work, development and implementation of emersion IRRAS is first described. Emersion IRRAS was used to investigate the model solvents water and methanol at three w-terminated-SAM-modified Ag surfaces (11-MUA, 11-MUD, and UDT-modified Ag) possessing a range of surface energies. These surfaces had been previously characterized with emersion Raman spectroscopy and/or ellipsometry. Furthermore, solvation of CO on Pt by three solvents (methanol, acetonitrile, and water) was investigated in an effort to attain molecular-level insight into electrochemically-relevant interfaces.Experimental results presented show successful implementation of emersion IRRAS. For each of the systems studied, interfacial solvent spectra clearly differed from those of bulk solvents indicating unique molecular structures of emersed liquids.