A Numerical Elastic Model for Deforming Bat Pinnae

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dc.contributor.authorBalakrishnan, Sreenathen
dc.contributor.committeechairMueller, Rolfen
dc.contributor.committeememberSocha, John J.en
dc.contributor.committeememberPriya, Shashanken
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:50:40Zen
dc.date.adate2011-01-12en
dc.date.available2014-03-14T20:50:40Zen
dc.date.issued2010-12-10en
dc.date.rdate2012-05-14en
dc.date.sdate2010-12-22en
dc.description.abstractIn bats, the directivity patterns for reception are shaped by the surface geometry of the pinnae. Since many bat species are capable of large ear deformations, these beampatterns can be time-variant. To investigate this time-variance using numerical methods, a digital model that is capable of representing the pinna geometry during the entire deformation cycle has been developed. Due to large deformations and occlusions, some of the surfaces relevant to sound diffraction may not be visible and the geometry of the entire pinna has to be computed from limited data. This has been achieved by combining a complete digital model of the pinna in one position with time-variant sparse sets of three dimensional landmark data. The landmark positions were estimated using stereo vision methods. A finite element model based on elasticity was constructed from CT scans of the pinna post mortem. This elastic model was deformed to provide a good fit to the positions of the landmarks and retain values of smoothness and surface energy comparable to life. This model was able to handle ratios of data to degrees of freedom around 1:5000 and still effect life-like deformations with an acceptable goodness of fit.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12222010-233428en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12222010-233428/en
dc.identifier.urihttp://hdl.handle.net/10919/36406en
dc.publisherVirginia Techen
dc.relation.haspartBalakrishnan_S_T_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectbat pinnaeen
dc.subjectDeformable modelsen
dc.subjectear movementsen
dc.subjectspatial hearingen
dc.subjectbiosonaren
dc.titleA Numerical Elastic Model for Deforming Bat Pinnaeen
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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