Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles
Reducing weight and increasing lift have been an important goal of using flapping wing micro air vehicles (FWMAVs). However, FWMAVs with mechanisms to limit the angle of attack (α) artificially by active force cannot meet specific requirements. This study applies a bioinspired model that passively i...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Applied Bionics and Biomechanics |
| Online Access: | http://dx.doi.org/10.1155/2019/1504310 |
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| _version_ | 1832550464847085568 |
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| author | Jinjing Hao Jianghao Wu Yanlai Zhang |
| author_facet | Jinjing Hao Jianghao Wu Yanlai Zhang |
| author_sort | Jinjing Hao |
| collection | DOAJ |
| description | Reducing weight and increasing lift have been an important goal of using flapping wing micro air vehicles (FWMAVs). However, FWMAVs with mechanisms to limit the angle of attack (α) artificially by active force cannot meet specific requirements. This study applies a bioinspired model that passively imitates insects’ pitching wings to resolve this problem. In this bionic passive pitching model, the wing root is equivalent to a torsional spring. α obtained by solving the coupled dynamic equation is similar to that of insects and exhibits a unique characteristic with two oscillated peaks during the middle of the upstroke/downstroke under the interaction of aerodynamic, torsional, and inertial moments. Excess rigidity or flexibility deteriorates the aerodynamic force and efficiency of the passive pitching wing. With appropriate torsional stiffness, passive pitching can maintain a high efficiency while enhancing the average lift by 10% than active pitching. This observation corresponds to a clear enhancement in instantaneous force and a more concentrated leading edge vortex. This phenomenon can be attributed to a vorticity moment whose component in the lift direction grows at a rapid speed. A novel bionic control strategy of this model is also proposed. Similar to the rest angle in insects, the rest angle of the model is adjusted to generate a yaw moment around the wing root without losing lift, which can assist to change the attitude and trajectory of a FWMAV during flight. These findings may guide us to deal with various conditions and requirements of FWMAV designs and applications. |
| format | Article |
| id | doaj-art-0511c74d87404043902f301dcaffaab5 |
| institution | Kabale University |
| issn | 1176-2322 1754-2103 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Applied Bionics and Biomechanics |
| spelling | doaj-art-0511c74d87404043902f301dcaffaab52025-02-03T06:06:42ZengWileyApplied Bionics and Biomechanics1176-23221754-21032019-01-01201910.1155/2019/15043101504310Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air VehiclesJinjing Hao0Jianghao Wu1Yanlai Zhang2School of Transportation Science and Engineering, Beihang University, Beijing 100191, ChinaSchool of Transportation Science and Engineering, Beihang University, Beijing 100191, ChinaSchool of Transportation Science and Engineering, Beihang University, Beijing 100191, ChinaReducing weight and increasing lift have been an important goal of using flapping wing micro air vehicles (FWMAVs). However, FWMAVs with mechanisms to limit the angle of attack (α) artificially by active force cannot meet specific requirements. This study applies a bioinspired model that passively imitates insects’ pitching wings to resolve this problem. In this bionic passive pitching model, the wing root is equivalent to a torsional spring. α obtained by solving the coupled dynamic equation is similar to that of insects and exhibits a unique characteristic with two oscillated peaks during the middle of the upstroke/downstroke under the interaction of aerodynamic, torsional, and inertial moments. Excess rigidity or flexibility deteriorates the aerodynamic force and efficiency of the passive pitching wing. With appropriate torsional stiffness, passive pitching can maintain a high efficiency while enhancing the average lift by 10% than active pitching. This observation corresponds to a clear enhancement in instantaneous force and a more concentrated leading edge vortex. This phenomenon can be attributed to a vorticity moment whose component in the lift direction grows at a rapid speed. A novel bionic control strategy of this model is also proposed. Similar to the rest angle in insects, the rest angle of the model is adjusted to generate a yaw moment around the wing root without losing lift, which can assist to change the attitude and trajectory of a FWMAV during flight. These findings may guide us to deal with various conditions and requirements of FWMAV designs and applications.http://dx.doi.org/10.1155/2019/1504310 |
| spellingShingle | Jinjing Hao Jianghao Wu Yanlai Zhang Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles Applied Bionics and Biomechanics |
| title | Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles |
| title_full | Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles |
| title_fullStr | Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles |
| title_full_unstemmed | Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles |
| title_short | Aerodynamic Performance of a Passive Pitching Model on Bionic Flapping Wing Micro Air Vehicles |
| title_sort | aerodynamic performance of a passive pitching model on bionic flapping wing micro air vehicles |
| url | http://dx.doi.org/10.1155/2019/1504310 |
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