Effect of rotor tilt on the gust rejection properties of multirotor aircraft
| dc.contributor.author | Whidborne, James F. | |
| dc.contributor.author | Mendez, Arthur P. | |
| dc.contributor.author | Cooke, Alastair | |
| dc.date.accessioned | 2022-10-19T11:23:12Z | |
| dc.date.available | 2022-10-19T11:23:12Z | |
| dc.date.issued | 2022-10-18 | |
| dc.description.abstract | In order to operate safely in windy and gusty conditions, multirotor VTOL aircraft require gust resilience. This paper shows that their gust rejection properties can be improved by applying a small amount of fixed outward rotor tilt. Standard aerodynamic models of the rotors are incorporated into two dynamic models to assess the gust rejection properties. The first case is a conceptual birotor planar VTOL aircraft. The dependence of the trim and stability on the tilt angle are analyzed. The aircraft is stabilized using a pole-placement approach in order to obtain consistent closed-loop station-keeping performance in still air. The effect of gusts on the resulting response is determined by simulation. The second case study is for a quadrotor with a 10∘" role="presentation" style="max-height: none; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; min-width: 0px; min-height: 0px; border-width: 0px; border-style: initial; position: relative;">10∘ outward rotor tilt. The aerodynamic coefficients are analyzed for trimmed station-keeping over a range of steady wind speeds. An LQR controller is used to apply station-keeping that includes integral action, and the gust responses are again obtained using simulation. The results show that the outward rotor tilt causes the aircraft to pitch down into a lateral gust, providing lateral force that opposes the gust and so significantly improving the gust rejection properties. | en_UK |
| dc.identifier.citation | Whidborne JF, Mendez AP, Cooke A. (2022) Effect of rotor tilt on the gust rejection properties of multirotor aircraft. Drones, Volume 6, Issue 10, October 2022, Article number 305 | en_UK |
| dc.identifier.issn | 2504-446X | |
| dc.identifier.uri | https://doi.org/10.3390/drones6100305 | |
| dc.identifier.uri | https://dspace.lib.cranfield.ac.uk/handle/1826/18577 | |
| dc.language.iso | en | en_UK |
| dc.publisher | MDPI | en_UK |
| dc.rights | Attribution 4.0 International | * |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
| dc.subject | UAV control | en_UK |
| dc.subject | quadrotors | en_UK |
| dc.subject | gust rejection | en_UK |
| dc.subject | stability | en_UK |
| dc.subject | non-minimum phase systems | en_UK |
| dc.subject | multirotors | en_UK |
| dc.title | Effect of rotor tilt on the gust rejection properties of multirotor aircraft | en_UK |
| dc.type | Article | en_UK |