An Investigation on Acoustic Metamaterial Physics to Inspire the Design of Novel Aircraft Engine Liners

Simple item page
dc.contributor.authorHubinger, Benjamin Evanen
dc.contributor.committeechairFuller, Christopher R.en
dc.contributor.committeememberSouthward, Steve C.en
dc.contributor.committeememberTian, Zhenhuaen
dc.contributor.committeememberNark, Dougen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2024-04-17T16:33:14Zen
dc.date.available2024-04-17T16:33:14Zen
dc.date.issued2024-04-02en
dc.description.abstractAttenuation of low frequency turbofan engine noise has been a challenging task in an industry that requires low weight and tightly-packed solutions. Without innovative advancements, the technology currently used will not be able to keep up with the increasingly stringent requirements on aircraft noise reduction. A need exists for novel technologies that will pave the way for the future of quiet aircraft. This thesis investigates acoustic metamaterials and their ability to achieve superior transmission loss characteristics not found in traditional honeycomb liners. The acoustic metamaterials investigated are an array of Helmholtz resonators with and without coupled cavities periodically-spaced along a duct wall. Analytical, numerical, and experimental developments of these acoustic metamaterial systems are used herein to study the effects of this technology on the transmission loss. Particularly focusing on analytical modeling will aid in understanding the underlying physics that governs their interesting transmission loss behavior. A deeper understanding of the physics will be used to aid in future acoustic metamaterial liner design. A parameter study is performed to understand the effects of the geometry, spacing, and number of resonators, as well as resonator cavity coupling on performance. Increased broadband transmission loss, particularly in low frequencies, is achieved through intelligent manipulation of these parameters. Acoustic metamaterials are shown to have appealing noise cancellation characteristics that prove to be effective for aircraft engine liner applications.en
dc.description.abstractgeneralAircraft noise reduction is an ongoing challenge for the aerospace industry. Without innovative advancements, the next generation of aircraft will not be able to keep up with increasingly stringent noise regulations; novel acoustic technology is needed to pave the way for a future of quieter aircraft. This thesis investigates acoustic metamaterials and their ability to achieve superior noise reduction over traditional methods. Modeling techniques were developed, and experimental tests were conducted to quantitatively evaluate the effectiveness of a new acoustic metamaterial system. The acoustic metamaterial design explored herein was proven to reduce noise effectively and shows promise for a world of quieter aircraft.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:38693en
dc.identifier.urihttps://hdl.handle.net/10919/118609en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAcoustic Meta Materials (AMM)en
dc.subjectTurbofan Engineen
dc.subjectHelmholtz Resonatoren
dc.subjectTransfer Matrix Method (TMM)en
dc.subjectBloch Wave Theoryen
dc.titleAn Investigation on Acoustic Metamaterial Physics to Inspire the Design of Novel Aircraft Engine Linersen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Hubinger_BE_T_2024.pdf
Size:
10.11 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses