A Hierarchical Noise Control System Using Adaptable Tuned Vibration Absorbers

Simple item page
dc.contributor.authorWright, Richard I.en
dc.contributor.committeechairFuller, Christopher R.en
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.committeememberGibbs, Gary P.en
dc.contributor.committeememberKidner, Michael R. F.en
dc.contributor.committeememberRobertshaw, Harry H.en
dc.contributor.committeememberJohnson, Martin E.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2011-08-22T19:02:56Zen
dc.date.adate2003-05-05en
dc.date.available2011-08-22T19:02:56Zen
dc.date.issued2004-07-26en
dc.date.rdate2004-05-05en
dc.date.sdate2003-05-01en
dc.description.abstractA novel noise control system is developed using adaptable tuned vibration absorbers (ATVA) to interact with a vibrating host structure in such a way as to reduce radiated acoustic energy. ATVA's are single-degree-of-freedom resonant devices that can change their resonant frequency and damping over a range. This ATVA noise control system is targeted at applications with tonal disturbances such as propeller aircraft. The motivation for this work is to better understand and experimentally demonstrate the noise control performance of globally detuned vibration absorbers (i.e. tuned away from the disturbance) compared to that of perfectly tuned devices on complex structures. A two-tier hierarchical control approach is used where a global control algorithm attempts to minimize a global parameter such as radiated acoustic energy by directing the adaptation of subordinate ATVA's. The global control algorithm uses an adaptive simplex search algorithm that requires no initial knowledge of the structure or the ATVA's. The ATVA's also require no model of the structure, each utilizing only the local vibration of its own mass and control gains set by the global controller. Noise control using a single ATVA is first studied on a small simply supported plate. Then, a multiple ATVA system is tested on a large plate structure at several test frequencies where many structural modes participate. Noise reductions up to 22 dB are achieved at locations in the radiated field. Further, it is found in some cases, classic tuning of the ATVA results in increased structural noise radiation. ATVA's are realized by outfitting typical inertial (proof-mass) actuators with a classical feedback loop. The device's resonant frequency and damping can be controlled independently, yet simultaneously via two control gains. The ATVA's are designed, built, and characterized for their adaptable domain and power requirements. A cohesive analytical model of the ATVA is also developed and used to compliment the experimental results.en
dc.description.degreePh. D.en
dc.format.mediumETDen
dc.identifier.otheretd-05012003-150544en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05012003-150544en
dc.identifier.urihttp://hdl.handle.net/10919/11217en
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectNoise Controlen
dc.subjectGlobally Detuneden
dc.subjectAdaptive Controlen
dc.subjectTVAen
dc.titleA Hierarchical Noise Control System Using Adaptable Tuned Vibration Absorbersen
dc.typeDissertationen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

Files

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

Collections

Doctoral Dissertations