On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight.
We study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. The current study deals with the estimation of unsteady aer...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2015-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4579066?pdf=render |
| _version_ | 1811206451153076224 |
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| author | Oksana Stalnov Hadar Ben-Gida Adam J Kirchhefer Christopher G Guglielmo Gregory A Kopp Alexander Liberzon Roi Gurka |
| author_facet | Oksana Stalnov Hadar Ben-Gida Adam J Kirchhefer Christopher G Guglielmo Gregory A Kopp Alexander Liberzon Roi Gurka |
| author_sort | Oksana Stalnov |
| collection | DOAJ |
| description | We study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. The current study deals with the estimation of unsteady aerodynamic forces on a freely flying bird through analysis of wingbeat kinematics and near wake flow measurements using time resolved particle image velocimetry. The aerodynamic forces are obtained through two approaches, the unsteady thin airfoil theory and using the momentum equation for viscous flows. The unsteady lift is comprised of circulatory and non-circulatory components. Both approaches are presented over the duration of wingbeat cycles. Using long-time sampling data, several wingbeat cycles have been analyzed in order to cover both the downstroke and upstroke phases. It appears that the unsteady lift varies over the wingbeat cycle emphasizing its contribution to the total lift and its role in power estimations. It is suggested that the circulatory lift component cannot assumed to be negligible and should be considered when estimating lift or power of birds in flapping motion. |
| first_indexed | 2024-04-12T03:47:54Z |
| format | Article |
| id | doaj.art-b6d1c533d3724b4899c11c86bb67f3f5 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-12T03:47:54Z |
| publishDate | 2015-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-b6d1c533d3724b4899c11c86bb67f3f52022-12-22T03:49:05ZengPublic Library of Science (PLoS)PLoS ONE1932-62032015-01-01109e013458210.1371/journal.pone.0134582On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight.Oksana StalnovHadar Ben-GidaAdam J KirchheferChristopher G GuglielmoGregory A KoppAlexander LiberzonRoi GurkaWe study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. The current study deals with the estimation of unsteady aerodynamic forces on a freely flying bird through analysis of wingbeat kinematics and near wake flow measurements using time resolved particle image velocimetry. The aerodynamic forces are obtained through two approaches, the unsteady thin airfoil theory and using the momentum equation for viscous flows. The unsteady lift is comprised of circulatory and non-circulatory components. Both approaches are presented over the duration of wingbeat cycles. Using long-time sampling data, several wingbeat cycles have been analyzed in order to cover both the downstroke and upstroke phases. It appears that the unsteady lift varies over the wingbeat cycle emphasizing its contribution to the total lift and its role in power estimations. It is suggested that the circulatory lift component cannot assumed to be negligible and should be considered when estimating lift or power of birds in flapping motion.http://europepmc.org/articles/PMC4579066?pdf=render |
| spellingShingle | Oksana Stalnov Hadar Ben-Gida Adam J Kirchhefer Christopher G Guglielmo Gregory A Kopp Alexander Liberzon Roi Gurka On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight. PLoS ONE |
| title | On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight. |
| title_full | On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight. |
| title_fullStr | On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight. |
| title_full_unstemmed | On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight. |
| title_short | On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight. |
| title_sort | on the estimation of time dependent lift of a european starling sturnus vulgaris during flapping flight |
| url | http://europepmc.org/articles/PMC4579066?pdf=render |
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