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Effect of air on vibration of structures


Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/11180

Effect of air on vibration of structures

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dc.contributor.author Xia, Tong
dc.date.accessioned 2010-09-10T19:40:44Z
dc.date.available 2010-09-10T19:40:44Z
dc.date.issued 2010-09-10
dc.date.submitted July 2010
dc.identifier.uri http://hdl.handle.net/1928/11180
dc.description.abstract This research primarily studies the effect of air on vibration of structures. Theoretical solutions based on various physics are derived and compared with experimental results to determine how air modifies the vibrational behavior of structures. This work may help in determining the characteristics of structural vibrations – from acoustic behavior to earthquake response - in practical buildings. The work consists of several primary components: derivation of theories that predict the effect of air on structural vibrations and vice-versa, design of experiments, and determination of the importance of air in structural vibrations and the applicability of different physics under various vibrational frequencies. Two types of physics - acoustic theory and fluid dynamics theory - are applied to derive solutions for damping ratios of air. Experiments such as an unbaffled plate experiment, a pendulum experiment and a baffled plate experiment are designed and conducted to observe the damping effect of air. Experimental results illustrate the applicability of the theories. Finite element analysis is performed to provide a computational basis with which to compare the observed vibrational frequencies. The main question in this research is whether air has a great effect on structural vibrations. The results show that air has a damping effect on vibrating buildings that can be important under certain conditions. The results also reveal that when calculating the damping effects due to air, different physics should be applied under different vibrational conditions. A dimensionless factor is derived to determine under which regimes acoustic theory is applicable, and under which regimes fluid dynamics theory is applicable. en_US
dc.description.sponsorship United States Department of Energy National Science Foundation Sandia National Laboratories en_US
dc.language.iso en_US en_US
dc.subject vibration en_US
dc.subject acoustic en_US
dc.subject Fluid en_US
dc.subject dynamics en_US
dc.subject air en_US
dc.subject damping en_US
dc.subject.lcsh Structural dynamics.
dc.subject.lcsh Vibration.
dc.subject.lcsh Damping (Mechanics)
dc.subject.lcsh Air pressure.
dc.subject.lcsh Aerodynamics.
dc.subject.lcsh Sound-waves.
dc.subject.lcsh Acoustic radiation pressure.
dc.subject.lcsh Fluid dynamics.
dc.subject.lcsh Fluid-structure interaction.
dc.title Effect of air on vibration of structures en_US
dc.type Thesis en_US
dc.description.degree Civil Engineering en_US
dc.description.level Masters en_US
dc.description.department University of New Mexico. Dept. of Civil Engineering en_US
dc.description.advisor Gerstle, Walter
dc.description.committee-member Ross, Timothy
dc.description.committee-member Hayat, Majeed
dc.description.committee-member Griffin, Steven

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