{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/97802"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/97802","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Bio-inspired adaptive wingtip devices for low Reynolds number operation","abstract":"The student, Michael Lynch, submitted this Thesis for approval on 2017-04-27 at 18:38.","abstract_html":"The student, Michael Lynch, submitted this Thesis for approval on 2017-04-27 at 18:38.","abstract_has_math":false,"creators":["Lynch, Michael K"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Wissa, Aimy"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-08-10T20:33:31Z","date_published":"2017-08-10T20:33:31Z","updated_at":"2026-07-22T22:24:34Z","subjects":["Avian-inspired flight","Wingtip devices","Multiple winglets","Low Reynolds"],"languages":["en"],"rights":["Copyright 2017 Michael K. Lynch"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/97802","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wissa, Aimy"]},{"key":"dc:creator","label":"Author","values":["Lynch, Michael K"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-08-10T20:33:31Z","2019-08-11T09:15:21Z","2017-04-28","2017-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Avian-inspired flight","Wingtip devices","Multiple winglets","Low Reynolds"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Michael K. Lynch"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/97802"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The student, Michael Lynch, submitted this Thesis for approval on 2017-04-27 at 18:38.","This Thesis was approved for publication on 2017-04-28 at 10:49.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11128 on 2017-08-10 at 15:07:19","Made available in DSpace on 2017-08-10T20:33:31Z (GMT). No. of bitstreams: 2 LYNCH-THESIS-2017.pdf: 6498881 bytes, checksum: 1e7ca7792e2fa54f7dabc1873eea79ac (MD5) LICENSE.txt: 4210 bytes, checksum: adae2f7ec028be0076624192109e12dc (MD5) Previous issue date: 2017-04-28","Embargo set by: Colleen Fallaw for item 102855 Lift date: 2019-08-10T21:27:21Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 102855 on 2019-08-11T09:15:21Z.","Birds are highly capable and maneuverable fliers, traits not currently shared with current unmanned aerial vehicles. They are able to achieve these flight capabilities by adapting the shape of their wings during flight in a variety of complex manners. One feature of bird wings, the primary feathers, separate to form wingtip gaps at the distal end of the wing. This research presents bio-inspired wingtip devices with varying wingtip gap sizes, defined as the chordwise distance between wingtip devices, for operation in low Reynolds number conditions of Re = 100,000, similar to conditions experienced by many species of birds. Lift and drag data was measured for planar and nonplanar wingtip devices with the total wingtip gap size ranging from 0% to 40%. For a planar wing with a gap size of 20%, the mean coefficient of lift in the pre-stall region is increased by 7.25%, and the maximum coefficient of lift is increased by 5.6% compared to a configuration with no gaps. The nonplanar wingtip device was shown to reduce the induced drag. The effect of wingtip gap sizes is shown to be independent of the planarity/nonplanarity of the wingtip device, thereby allowing designers to decouple the wingtip parameters to tune the desired lift and drag produced. A light weight morphing mechanism design process is proposed, thereby enabling designers to build an adaptive wing that takes advantage of high lift benefits of having 20% wingtip gaps, useful for high payload conditions, as well as low drag benefits of having no gaps, useful for cruise conditions.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-05-01","The student, Michael Lynch, accepted the attached license on 2017-04-27 at 18:31."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Bio-inspired adaptive wingtip devices for low Reynolds number operation"]}]}],"canonical_facts":{"dc:contributor":["Wissa, Aimy"],"dc:creator":["Lynch, Michael K"],"dc:date":["2017-08-10T20:33:31Z","2019-08-11T09:15:21Z","2017-04-28","2017-05"],"dc:description":["The student, Michael Lynch, submitted this Thesis for approval on 2017-04-27 at 18:38.","This Thesis was approved for publication on 2017-04-28 at 10:49.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11128 on 2017-08-10 at 15:07:19","Made available in DSpace on 2017-08-10T20:33:31Z (GMT). No. of bitstreams: 2 LYNCH-THESIS-2017.pdf: 6498881 bytes, checksum: 1e7ca7792e2fa54f7dabc1873eea79ac (MD5) LICENSE.txt: 4210 bytes, checksum: adae2f7ec028be0076624192109e12dc (MD5) Previous issue date: 2017-04-28","Embargo set by: Colleen Fallaw for item 102855 Lift date: 2019-08-10T21:27:21Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 102855 on 2019-08-11T09:15:21Z.","Birds are highly capable and maneuverable fliers, traits not currently shared with current unmanned aerial vehicles. They are able to achieve these flight capabilities by adapting the shape of their wings during flight in a variety of complex manners. One feature of bird wings, the primary feathers, separate to form wingtip gaps at the distal end of the wing. This research presents bio-inspired wingtip devices with varying wingtip gap sizes, defined as the chordwise distance between wingtip devices, for operation in low Reynolds number conditions of Re = 100,000, similar to conditions experienced by many species of birds. Lift and drag data was measured for planar and nonplanar wingtip devices with the total wingtip gap size ranging from 0% to 40%. For a planar wing with a gap size of 20%, the mean coefficient of lift in the pre-stall region is increased by 7.25%, and the maximum coefficient of lift is increased by 5.6% compared to a configuration with no gaps. The nonplanar wingtip device was shown to reduce the induced drag. The effect of wingtip gap sizes is shown to be independent of the planarity/nonplanarity of the wingtip device, thereby allowing designers to decouple the wingtip parameters to tune the desired lift and drag produced. A light weight morphing mechanism design process is proposed, thereby enabling designers to build an adaptive wing that takes advantage of high lift benefits of having 20% wingtip gaps, useful for high payload conditions, as well as low drag benefits of having no gaps, useful for cruise conditions.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-05-01","The student, Michael Lynch, accepted the attached license on 2017-04-27 at 18:31."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/97802"],"dc:language":["en"],"dc:rights":["Copyright 2017 Michael K. Lynch"],"dc:subject":["Avian-inspired flight","Wingtip devices","Multiple winglets","Low Reynolds"],"dc:title":["Bio-inspired adaptive wingtip devices for low Reynolds number operation"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:34Z"}