Diffusion of airborne sound using acoustic metamaterials

dc.contributor.advisorHaberman, Michael R. (Michael Richard), 1977-
dc.contributor.advisorWilson, Preston S.
dc.creatorCheung, Fiona S.
dc.date.accessioned2021-10-09T20:18:00Z
dc.date.available2021-10-09T20:18:00Z
dc.date.created2018-08
dc.date.issued2018-08-16
dc.date.submittedAugust 2018
dc.date.updated2021-10-09T20:18:02Z
dc.description.abstractAcoustic surface treatments, such as absorbers and diffusers, are used to control unwanted reflections in rooms. These reflections, when excessive, can create an unpleasant experience for both audiences and performers in any space, not just performance spaces. Existing acoustic absorbers, including Helmholtz resonators, quarter-wave resonators, and panel absorbers, are discussed in this thesis. The most common diffuser, the Quadratic Residue Diffuser (QRD), is also explored in detail. While QRDs are well known for their predictability and ease of design, they suffer from two main drawbacks: size and aesthetics. This thesis explores the use of acoustic metamaterials, specifically coiled space metamaterials, to replace the QRD. These metamaterials seek to address these specific problems with QRD designs while replicating its ability to scatter acoustic waves in a predictable fashion. Two specific coiled space metamaterial designs are discussed in detail, and their responses are compared to that of the QRD to determine whether they can be viable replacements. The results of the comparisons, while unable to replicate the response of the standard QRD exactly, did show modest improvements. More validation must be done before a definitive answer can be given as to whether either of these designs are able to be successful replacements for the QRD
dc.description.departmentMechanical Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/88573
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/15507
dc.language.isoen
dc.subjectAcoustics
dc.subjectMetamaterials
dc.subjectDiffusion
dc.subjectAbsorption
dc.subjectAbsorbers
dc.subjectDiffusers
dc.subjectMetasurfaces
dc.titleDiffusion of airborne sound using acoustic metamaterials
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentMechanical Engineering
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Engineering

Access full-text files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
CHEUNG-THESIS-2018.pdf
Size:
22.97 MB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 2 of 2
No Thumbnail Available
Name:
PROQUEST_LICENSE.txt
Size:
4.45 KB
Format:
Plain Text
Description:
No Thumbnail Available
Name:
LICENSE.txt
Size:
1.84 KB
Format:
Plain Text
Description: