VTechWorks staff will be away for the Thanksgiving holiday beginning at noon on Wednesday, November 27, through Friday, November 29. We will resume normal operations on Monday, December 2. Thank you for your patience.
 

Broadband Acoustic Liner Optimization Study Using Novel Poro-elastic Materials

Simple item page
dc.contributor.authorMitchell, Kelsey Ryanen
dc.contributor.committeechairFuller, Christopher R.en
dc.contributor.committeechairPhilen, Michael K.en
dc.contributor.committeememberLowe, K. Todden
dc.contributor.committeememberNark, Dougen
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2015-06-17T08:00:58Zen
dc.date.available2015-06-17T08:00:58Zen
dc.date.issued2015-06-16en
dc.description.abstractWith the continual challenges associated with reducing aircraft engine noise, there is need for acoustic liner configurations that target broadband performance. This thesis experimentally and analytically investigates passive noise control methods to improve broadband frequency attenuation through various acoustic liner designs. The inclusion of acoustic metamaterials within these liners is examined and optimized. The metamaterials studied consist of resonant and non-resonant materials which include porous foams, microperforated plates (MPP), and embedded aluminum masses. Through finite element analysis, the understanding of the physics behind acoustics as well as aeroacoustics inspire their design. Sensitivity studies on the overall liner shape, facesheet properties, poro-elastic material properties, MPP's, as well as size and placement of embedded masses assist in successfully achieving broadband attenuation. Within the finite element study, an optimization tool will provide additional assistance in quantifying critical system parameters within the designs by minimizing the sum of the transmitted sound intensity over the design frequency bandwidth and hence maximizing attenuation. Broadband frequency absorption and attenuation is successfully achieved within the frequency range of 400-2600 Hz through the design of a varying depth optimized acoustic liner as well as a metamaterial-inspired liner.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:5395en
dc.identifier.urihttp://hdl.handle.net/10919/52947en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectBroadband Acoustic Linersen
dc.titleBroadband Acoustic Liner Optimization Study Using Novel Poro-elastic Materialsen
dc.typeThesisen
thesis.degree.disciplineAerospace 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:
Mitchell_KR_T_2015.pdf
Size:
2.86 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses