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dc.contributor.authorChang, Brian Lidaen
dc.date.accessioned2018-06-02T08:00:29Zen
dc.date.available2018-06-02T08:00:29Zen
dc.date.issued2018-06-01en
dc.identifier.othervt_gsexam:15435en
dc.identifier.urihttp://hdl.handle.net/10919/83445en
dc.description.abstractThis dissertation aims to contribute toward the understanding of water-entry and -exit behaviors in nature. Since water is nearly a thousand times denser than air, transitioning between the two mediums is often associated with significant changes in force. Three topics with implications in water-entry are discussed, along with a fourth topic on water-exit. For a plunge-diving seabird, the first two stages of water-entry (initial impact and air-cavity formation) create large stresses on the bird's neck. Linear stability analysis of a cone-beam system impacting water shows buckling and non-buckling behaviors on the beam, which is extended to the diving birds. The next topic is related to the third stage of water-entry (air-cavity pinch-off), in which the chest feathers come in contact with the water. Here, the elasticity of Northern Gannet contour feathers is calculated using the nonlinear bending equation. The third topic will explore the formation of ripples along air cavity walls and their resulting force after pinch-off. An acoustic model predicts the observed wavelengths of the ripples. The final topic will delve into the mechanics of how animals leap out of water. A scaling law that balances the power of thrust and drag will predict the height of the jump. Finally, a bio-inspired robot was built to help identify physical conditions required to jump out of water.en
dc.format.mediumETDen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectWater-entryen
dc.subjectwater-exiten
dc.subjectfeatheren
dc.subjectseabirden
dc.subjectplunge-diveen
dc.subjectair-cavityen
dc.subjectjumpingen
dc.subjectimpacten
dc.titleCrossing the Air-Water Interface: Inspiration from Natureen
dc.typeDissertationen
dc.contributor.departmentEngineering Science and Mechanicsen
dc.description.degreePh. D.en
thesis.degree.namePh. D.en
thesis.degree.leveldoctoralen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineEngineering Mechanicsen
dc.contributor.committeechairJung, Sunghwanen
dc.contributor.committeememberSocha, John J.en
dc.contributor.committeememberAbaid, Nicoleen
dc.contributor.committeememberRagab, Saad A.en
dc.contributor.committeememberBarone, Justin R.en


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