Journal article 671 views 222 downloads
The effect of curved tips on the dynamics of composite rotor blades
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Michael Friswell
Aerospace Science and Technology, Volume: 106, Start page: 106197
Swansea University Authors:
Alexander Shaw , Michael Friswell
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DOI (Published version): 10.1016/j.ast.2020.106197
Abstract
In this paper, the dynamics of a tailored composite rotating blade with curved tips are investigated, with a view to improving the dynamic behaviour of the blade in flight. The blade tip is curved either in the out-of-plane or in the in-plane directions. The composite blade is modelled by using the...
| Published in: | Aerospace Science and Technology |
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| ISSN: | 1270-9638 |
| Published: |
Elsevier BV
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa55197 |
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| Abstract: |
In this paper, the dynamics of a tailored composite rotating blade with curved tips are investigated, with a view to improving the dynamic behaviour of the blade in flight. The blade tip is curved either in the out-of-plane or in the in-plane directions. The composite blade is modelled by using the exact beam formulation, and the cross-sectional properties of the blade are obtained using the variational asymptotic method. The resulting nonlinear partial differential equations are discretised using a time-space scheme, and the stationary and rotating frequencies of the blade are obtained from the eigenvalues of the linearised system. Three case studies are considered here each of them representing one of the main elastic couplings that might happen in a composite blade. These three elastic couplings are the flap-twist, lag-twist, and extension-twist couplings. All these couplings are very important in the blade design as they can affect the twist and hence the dynamics of the blade. The blade tip length and curvature value are two main parameters that this paper is focused on. It is shown that the curved tip of the blade affects the blade frequencies by adding extra couplings, and therefore could be used as a potential morphing concept for tuning the frequencies, enhancing the aeroelastic stability or performance of the blade in flight. |
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| Keywords: |
Rotating frequencies, Veering, Fully intrinsic equations, Composite blade, Elastic couplings |
| College: |
Faculty of Science and Engineering |
| Start Page: |
106197 |