Experimental Study of Lag-twist Coupling Concept for Rotor Blade Application

H Gu (Swansea University), M Amoozgar (University of Huddersfield), AD Shaw, J Zhang (Swansea University), C Wang (Nanjing University of Aeronautics and Astronautics, China) & MI Friswell (Swansea University)

Composite Structures, Vol. 275, 1 November 2021, paper 114417


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.

Paper Availability

This material has been published in the Composite Structures, Vol. 275, 1 November 2021, paper 114417. Unfortunately the copyright agreement with Elsevier does not allow for the PDF file of the paper to be available on this website.

Link to paper using doi: 10.1016/j.compstruct.2021.114417

Composite Structures