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Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar / Mohammadreza Amoozgar; Alexander Shaw; 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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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...

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Published in: Aerospace Science and Technology
ISSN: 1270-9638
Published: Elsevier BV 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50569
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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. 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spelling 2020-11-19T16:01:39.3455999 v2 50569 2019-05-30 Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar 56910e9937b39a1a96d6252845c385d3 Mohammadreza Amoozgar Mohammadreza Amoozgar true false 10cb5f545bc146fba9a542a1d85f2dea 0000-0002-7521-827X Alexander Shaw Alexander Shaw true false 12b61893c794b14f11cf0a84cb947d0e 0000-0001-7308-5090 Jiaying Zhang Jiaying Zhang true false fdea93ab99f51d0b3921d3601876c1e5 0000-0002-1001-2537 Chengyuan Wang Chengyuan Wang true false 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 2019-05-30 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. Journal Article Aerospace Science and Technology 91 539 547 Elsevier BV 1270-9638 Twist morphing, Lag-twist coupling, Fully intrinsic equations, Cross-section design, Concentrated mass 1 8 2019 2019-08-01 10.1016/j.ast.2019.05.053 COLLEGE NANME COLLEGE CODE Swansea University 2020-11-19T16:01:39.3455999 2019-05-30T11:07:49.7016896 College of Engineering Engineering Mohammadreza Amoozgar 1 Alexander Shaw 0000-0002-7521-827X 2 Jiaying Zhang 0000-0001-7308-5090 3 Chengyuan Wang 0000-0002-1001-2537 4 Michael Friswell 5 0050569-31052019131325.pdf amoozgar2019(2).pdf 2019-05-31T13:13:25.3000000 Output 1169891 application/pdf Accepted Manuscript true 2020-05-24T00:00:00.0000000 ©2019 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng
title Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
spellingShingle Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
Mohammadreza, Amoozgar
Alexander, Shaw
Jiaying, Zhang
Chengyuan, Wang
Michael, Friswell
title_short Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
title_full Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
title_fullStr Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
title_full_unstemmed Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
title_sort Lag-twist coupling sensitivity and design for a composite blade cross-section with D-spar
author_id_str_mv 56910e9937b39a1a96d6252845c385d3
10cb5f545bc146fba9a542a1d85f2dea
12b61893c794b14f11cf0a84cb947d0e
fdea93ab99f51d0b3921d3601876c1e5
5894777b8f9c6e64bde3568d68078d40
author_id_fullname_str_mv 56910e9937b39a1a96d6252845c385d3_***_Mohammadreza, Amoozgar
10cb5f545bc146fba9a542a1d85f2dea_***_Alexander, Shaw
12b61893c794b14f11cf0a84cb947d0e_***_Jiaying, Zhang
fdea93ab99f51d0b3921d3601876c1e5_***_Chengyuan, Wang
5894777b8f9c6e64bde3568d68078d40_***_Michael, Friswell
author Mohammadreza, Amoozgar
Alexander, Shaw
Jiaying, Zhang
Chengyuan, Wang
Michael, Friswell
author2 Mohammadreza Amoozgar
Alexander Shaw
Jiaying Zhang
Chengyuan Wang
Michael Friswell
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container_volume 91
container_start_page 539
publishDate 2019
institution Swansea University
issn 1270-9638
doi_str_mv 10.1016/j.ast.2019.05.053
publisher Elsevier BV
college_str College of Engineering
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hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description 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.
published_date 2019-08-01T04:14:26Z
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