Experimental validation of inertial twist concept for rotor blade application

Huaiyuan Gu*, Javad Taghipour, Andres E Rivero, Mohammadreza Amoozgar, Alexander Shaw, Jiaying Zhang, Chen Wang, Michael I Friswell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)
23 Downloads (Pure)

Abstract

The present study performs a set of static tests to demonstrate a novel passive morphing concept. The concept introduces a bend–twist coupled composite spar to rotor blades, allowing for twist morphing to be achieved by imposing a lagwise bending moment using centrifugal forces produced by a movable mass at the blade tip. First, three composite spars are fabricated using a symmetric layup configuration with varied ply orientations. A set of static tests are designed to replicate the effect of the centrifugal forces during rotation, where the detailed distribution of twist, deflection and strain are measured on each spar with varied loading conditions. The experimental results suggest that the blade twist can be well controlled by the position of the tip mass and rotational speed. It was also found the distribution of the twist is linear when the spar deflection is small, whereas a quadratic twist distribution was observed for a large tip deflection due to the induced lateral restoring forces. Furthermore, the influence of the ply angle upon the coupled twist is demonstrated from the experimental and numerical results.
Original languageEnglish
Article number115414
JournalComposite Structures
Volume288
Early online date4 Mar 2022
DOIs
Publication statusPublished - 15 May 2022

Bibliographical note

Funding Information:
The authors acknowledge funding from the European Union's Horizon 2020 project ?Shape Adaptive Blades for Rotorcraft Efficiency (SABRE)?, under grant agreement 723491.

Funding Information:
The authors acknowledge funding from the European Union’s Horizon 2020 project ‘Shape Adaptive Blades for Rotorcraft Efficiency (SABRE)’, under grant agreement 723491 .

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

  • Composite rotor blade
  • Morphing
  • Bend–twist coupling
  • Composite manufacturing
  • FE analysis

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