Passive Viscoelastic Constrained Layer Damping Application for a Small Aircraft Landing Gear System

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dc.contributor.authorGallimore, Craig Allenen
dc.contributor.committeechairKochersberger, Kevin B.en
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.committeememberDe Vita, Raffaellaen
dc.contributor.committeememberFerris, John B.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:46:33Zen
dc.date.adate2008-10-20en
dc.date.available2014-03-14T20:46:33Zen
dc.date.issued2008-09-30en
dc.date.rdate2008-10-20en
dc.date.sdate2008-10-10en
dc.description.abstractThe main purpose of this report was to test several common viscoelastic polymers and identify key attributes of their applicability to a small aircraft landing gear system for improved damping performance. The applied viscoelastic damping treatment to the gear was of a constrained layer type, promoting increased shear deformation over free surface treatments, and therefore enhanced energy dissipation within the viscoelastic layer. A total of eight materials were tested and analyzed using cyclic loading equipment to establish approximate storage modulus and loss factor data at varying loading frequencies. The three viscoelastic polymers having the highest loss factor to shear modulus ratio were chosen and tested using a cantilever beam system. A Ross, Kerwin, and Ungar analysis was used to predict the loss factor of the cantilever beam system with applied treatment and the predictions were compared to experimental data. Customer requirements often govern the scope and intensity of design in many engineering applications. Limitations and constraints, such as cost, weight, serviceability, landing gear geometry, environmental factors, and manufacturability in regards to the addition of a viscoelastic damping treatment to a landing gear system are discussed. Based on results found from theoretical and experimental testing, application of a damping treatment to a small aircraft landing gear system is very promising. Relatively high loss factors were seen in a cantilever beam for simple single layer constrained treatments for very low strain amplitudes relative to strains seen during loading of the landing gear. With future design iterations, damping levels several times those seen in this document will be seen with a constrained treatment applied to a landing gear system.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-10102008-124400en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10102008-124400/en
dc.identifier.urihttp://hdl.handle.net/10919/35350en
dc.publisherVirginia Techen
dc.relation.haspartThesis_CraigGallimore_Rev1.pdfen
dc.relation.haspartPermission_for_Copyrighted_Material.docen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAircraften
dc.subjectLanding Gearen
dc.subjectLoss Factoren
dc.subjectViscoelasticen
dc.subjectDampingen
dc.titlePassive Viscoelastic Constrained Layer Damping Application for a Small Aircraft Landing Gear Systemen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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