Passive wake detection using seal whisker-inspired sensing

dc.contributor.author Beem, Heather R.
dc.coverage.spatial 46.22°N; 125.22°W
dc.coverage.spatial Astoria Canyon
dc.date.accessioned 2015-02-02T20:45:24Z
dc.date.available 2015-02-02T20:45:24Z
dc.date.issued 2015-02
dc.description Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2015 en_US
dc.description.abstract This thesis is motivated by biological experiments, which display the harbor seal's ability to track the wake of an object several seconds after it swam by. In this work, I elucidate the basic fluid mechanisms that seals may employ to accomplish this detection. Key are the unique vortex-induced vibration (VIV) properties resulting from the geometry of the harbor seal whisker. First, force measurements and flow visualizations on a rigid whisker model undergoing 1-D imposed oscillations show that the geometry passively reduces VIV (factor of >10), despite contributions from effective added mass and damping. This suggests that harbor seal whiskers would detect details of the oncoming flow with reduced background “noise". Next, a biomimetic whisker sensor is designed by mounting the model on a four-armed flexure, allowing it to freely vibrate, and using strain gauges to measure deflections at the whisker base. Finally, this whisker device is towed behind an upstream cylinder with larger diameter. In the wake, the whisker oscillates with large amplitude and at the Strouhal frequency of the upstream cylinder. A slaloming motion among the wake vortices drives this interaction, and it enables detection of the upstream wake. en_US
dc.description.sponsorship NDSEG Fellowship, MIT Presidential Fellowship, Link Foundation Fellowship, and the National Research Foundation Singapore through the Singapore MIT Alliance for Research and Technology's Center for Environmental Sensing and Modeling interdisciplinary research program. Support was also provided by the Office of Naval Research through grant N00014-13-1-0059, monitored by Dr. Thomas Swean, Jr., the MIT Sea Grant Program, and the William I. Koch Chair in Marine Technology. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Beem, H. R. (2015). Passive wake detection using seal whisker-inspired sensing [Doctoral thesis, Massachusetts Institute of Technology and Woods Hole Oceanographic Institution]. Woods Hole Open Access Server. https://doi.org/10.1575/1912/7124
dc.identifier.doi 10.1575/1912/7124
dc.identifier.uri https://hdl.handle.net/1912/7124
dc.language.iso en_US en_US
dc.publisher Massachusetts Institute of Technology and Woods Hole Oceanographic Institution en_US
dc.relation.ispartofseries WHOI Theses en_US
dc.subject Wecoma (Ship) Cruise W1109C en_US
dc.subject Wakes
dc.subject Harbor seal
dc.subject Behavior
dc.title Passive wake detection using seal whisker-inspired sensing en_US
dc.type Thesis en_US
dspace.entity.type Publication
relation.isAuthorOfPublication 4e91fb44-a317-415d-8238-fa74ee93e5f0
relation.isAuthorOfPublication.latestForDiscovery 4e91fb44-a317-415d-8238-fa74ee93e5f0
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