HIGH WAVE VECTOR ACOUSTIC METAMATERIALS: FUNDAMENTAL STUDIES AND APPLICATIONS

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dc.contributor.advisorYu, Miaoen_US
dc.contributor.authorGanye, Randy Tahen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2020-10-10T05:37:16Z
dc.date.available2020-10-10T05:37:16Z
dc.date.issued2020en_US
dc.description.abstractAcoustic metamaterials are artificially engineered structures with subwavelength unit cells that hold extraordinary acoustic properties. Their ability to manipulate acoustic waves in ways that are not readily possible in naturally occurring materials have garnered much attention by researchers in recent years. In this dissertation work, acoustic metamaterials that enable wave propagation with high wave vector values are studied. These materials render several key properties, including energy confinement and transport, wave control enhancement, and enhancement of acoustic radiation, which are exploited for enhancing acoustic wave emission and reception. The dissertation work is summarized as follows. First, to enable experimental studies of the deep subwavelength cavities in these metamaterials, a low dimensional fiber optic probe was developed, which allows direct characterization of the intrinsic properties of the metamaterials without seriously disrupting the acoustic fields. Second, low dimensional acoustic metamaterials for enhancing acoustic reception were realized and studied. These metamaterials were demonstrated to achieve both passive and active functionalities, including passive signal amplification and frequency filtering, as well as active tuning for switching and pulse retardation control. Third, a metamaterial emitter was realized and studied, which is capable of enhancing the radiative properties of an embedded emitter. Parametric studies enhanced the understanding of the effects of different geometric parameters on the radiation performance of the structure. Finally, the metamaterial emitter and receiver were combined to form a metamaterial-based sonar system. For the first time, the superior performance of the metamaterial enhanced sonar system over conventional sonar systems was analytically and experimentally demonstrated. As a proof of concept, a robotic sonar platform equipped with the metamaterial system was shown to possess remarkably better tracking performance compared to the conventional system. Through this dissertation work, an enhanced understanding of high-k acoustic metamaterials has been achieved, and their applications in acoustic sensing, emission enhancement, and sonar systems have been demonstrated.en_US
dc.identifierhttps://doi.org/10.13016/93jk-oew8
dc.identifier.urihttp://hdl.handle.net/1903/26622
dc.language.isoenen_US
dc.subject.pqcontrolledAcousticsen_US
dc.subject.pqcontrolledRoboticsen_US
dc.subject.pquncontrolledAcoustic metamaterialsen_US
dc.subject.pquncontrolledHigh wave vectoren_US
dc.subject.pquncontrolledmetamaterial roboten_US
dc.subject.pquncontrolledmetamaterial sonaren_US
dc.subject.pquncontrolledMetamaterialsen_US
dc.subject.pquncontrolledsonaren_US
dc.titleHIGH WAVE VECTOR ACOUSTIC METAMATERIALS: FUNDAMENTAL STUDIES AND APPLICATIONSen_US
dc.typeDissertationen_US

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