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Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
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Jiaying Zhang ,
Chengyuan Wang ,
Michael Friswell
Aerospace Science and Technology, Volume: 91, Pages: 539 - 547
Swansea University Authors:
Mohammadreza Amoozgar, Alexander Shaw , Jiaying Zhang , Chengyuan Wang , Michael Friswell
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DOI (Published version): 10.1016/j.ast.2019.05.053
Abstract
In this paper, the effect of various parameters of a specific rotor blade cross-section on the effectiveness of a twist morphing concept is investigated. Then, by considering different constraints, a cross-section consistent with this morphing concept with high lag-twist coupling and low extension-t...
| Published in: | Aerospace Science and Technology |
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| ISSN: | 1270-9638 |
| Published: |
Elsevier BV
2019
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa50569 |
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| Abstract: |
In this paper, the effect of various parameters of a specific rotor blade cross-section on the effectiveness of a twist morphing concept is investigated. Then, by considering different constraints, a cross-section consistent with this morphing concept with high lag-twist coupling and low extension-twist, is developed. This lag bending-torsion coupling is used to change the twist of the blade during the flight, while the high values of extension-twist coupling is avoided. To this end, a concentrated mass is added to the blade, where its chordwise location varies in flight. When the mass moves in the chordwise direction, a local lag bending is introduced into the blade. This in-plane bending moment then changes the blade twist distribution through lag-twist coupling induced through stiffness tailoring in the blade cross-section. Therefore, this coupling plays an important role in this morphing concept. The one-dimensional dynamics of the blade is modelled by using the geometrically exact fully intrinsic bean equations while the 2D cross-sectional stiffness values are determined by using the VABS software. First, a blade which resembles the BO-105 main rotor blade in the fundamental frequencies is designed. Then, the effect of various parameters of the cross-section on the fundamental frequencies, the lag-twist coupling, and the extension-twist coupling are determined. It is found that the skin of the spar has the highest contribution to both the extension-twist and the lag-twist coupling. Finally, a cross-section compatible with the proposed morphing concept is designed and it is demonstrated that the twist of the blade may be changed significantly. |
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| Keywords: |
Twist morphing, Lag-twist coupling, Fully intrinsic equations, Cross-section design, Concentrated mass |
| College: |
Faculty of Science and Engineering |
| Start Page: |
539 |
| End Page: |
547 |