Experimental study of lag-twist coupling concept for rotor blade application

Huaiyuan Gu, Mohammadreza Amoozgar, Alexander D. Shaw, Jiaying Zhang, Chen Wang, Michael I. Friswell

Research output: Contribution to journalArticlepeer-review

Abstract

A novel passive twist morphing concept is examined for helicopter blades. The concept is demonstrated using a thin-walled rectangular composite beam created with symmetric layup to obtain bend-twist property. The twist of a rotor blade is proposed to be actuated though a movable mass at the blade tip which is able to provide a range of lagwise bending moment during rotation as a result of the centrifugal force. First a set of static bending test is performed which provides detailed characterisation of the deformation and strain distribution of the composite beam subjected to a number of bending loads. The results of the experiment fully verify numerical predictions including finite element approach (FE) and beam cross sectional analysis. A series of simulations are then conducted using the verified numerical model to demonstrate how the desired twist can be effectively achieved by manipulating the size and location of the mass.

Original languageEnglish
Article number114417
Number of pages11
JournalComposite Structures
Volume275
Early online date28 Jul 2021
DOIs
Publication statusE-pub ahead of print - 28 Jul 2021

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