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Acoustic manipulation with elastomeric parabolic reflectors and applied vacuum
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Apte, Saurabh. Acoustic manipulation with elastomeric parabolic reflectors and applied vacuum. Retrieved from https://doi.org/doi:10.7282/T34M97RQ

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TitleAcoustic manipulation with elastomeric parabolic reflectors and applied vacuum
NameApte, Saurabh (author); Mazzeo, Aaron (chair); Malhotra, Rajiv (internal member); Denda, Mitsunori (internal member); Singer, Jonathan (internal member); Rutgers University; School of Graduate Studies
Date Created2018
Other Date2018-01 (degree)
SubjectMechanical and Aerospace Engineering, Acoustical engineering
Extent1 online resource (xii, 96 p. : ill.)
DescriptionThis thesis describes a parabolic acoustic reflector with an inflatable reflecting surface, which has tunable gain and directivity. Conventional parabolic reflectors focus and amplify sound waves using metallic or plastic dishes with fixed geometries. This work presents a morphable reflecting surface that deforms into a concave structure to provide polar response and tunable gain considering the deformed geometry of the reflector. The deformable concave structure was a silicone elastomer (Ecoflex 00-10) with a coefficient of reflection approximately 0.9. This reflective coefficient suggests these silicone-based elastomers serve as reflective substrates for advanced morphable devices to manipulate sound. We experimentally determined the Youngs Modulus and the radial displacement achieved during pre-stressing the membrane over the aluminum reflector. For our parabolic reflector, acoustic gain and directionality depended on the level of vacuum applied to the elastomeric membranes, which affected the curvature of the paraboloid. Experiments performed in closed and open environments, along with simulations, demonstrate that the soft reflective surface was capable of transformation into a set of desired parabolic shapes between an initial planar geometry (neutral position) and configurations with varying curvature. The magnitude of the acoustic power gain obtained for vacuums below -1.7 kPa at frequencies greater than 7 kHz was comparable with gains of commercially available reflectors, and the directional response of the reflector was super hyper cardioid in nature. The maximum gain was also ~17 dB at 8.5 kHz. Simulations coupling mechanical deformation with acoustic shells agreed qualitatively with experimental results. These systems might find future uses for adjustable parabolic microphones, long-range communication devices, and tracking of sound sources.
NoteM.S.
NoteIncludes bibliographical references
Noteby Saurabh Apte
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T34M97RQ
Languageeng
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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