dc.contributor.advisor |
Hall, Andrew |
|
dc.contributor.advisor |
Sorokin, Vladislav |
|
dc.contributor.author |
Tshuma, Joshua |
|
dc.date.accessioned |
2022-09-15T01:30:48Z |
|
dc.date.available |
2022-09-15T01:30:48Z |
|
dc.date.issued |
2022 |
en |
dc.identifier.uri |
https://hdl.handle.net/2292/61233 |
|
dc.description.abstract |
Theoretical simulations and experimental tests were conducted on Helmholtz resonators (HRs)
to investigate their use for mass-air-mass (MAM) resonance suppression. Conventional/rigid resonators
(RHR) for MAM resonance suppression have been studied and published in the literature. However,
the focus of this thesis is to investigate the effects of coupling the resonator to a flexible membrane to
increase its sound transmission loss performance and decrease the overall resonator cavity volume.
Three-dimensional (3D) printing was used to print small-scale testing specimens, and PVC piping was
used to test their behaviour in a full wall for large-scale tests. The results obtained show that a
membrane-coupled HR (MHR) can achieve similar STL performance as a conventional RHR with
nearly half the cavity volume, allowing for the possibility of using more resonators and further
increasing STL at the MAM resonance frequency. It was also noted that using HRs with a single
resonance frequency, for example, 100 Hz, resulted in a narrow STL bandwidth. An array (cluster) of
resonators was designed to have multiple resonance frequencies, and an increase in STL bandwidth was
observed, with a decrease of approximately 3dB in peak STL value. Although this trade-off exists, the
broadband suppression observed makes using HRs for MAM resonance suppression advantageous. |
|
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
Masters Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
|
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
|
dc.title |
Membrane-Coupled Helmholtz Resonators for Mass-Air-Mass Resonance Suppression |
|
dc.type |
Thesis |
en |
thesis.degree.discipline |
Mechanical Engineering |
|
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Masters |
en |
dc.date.updated |
2022-08-13T02:28:48Z |
|
dc.rights.holder |
Copyright: the author |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/OpenAccess |
en |