Increasing Damping Properties of Helicopter Composite Substructures using Flax Fiber Hybridization

Le résumé fourni par la source

Helicopter and VTOL structures are heavily influenced by vibrations and complex interaction effects. One possible solution to minimize design risks and to enhance cabin comfort is to increase the damping in the vehicle's structure, for which natural flax fibers offer a promising approach. The presented study investigated the hybridization of conventional composites with flax fibers of sub-structural components, including double-T beams and airfoil structures. The frequency dependent dynamic properties of the structures, damping and stiffness, are measured using experimental modal analysis. Local flax rib reinforcements on shells showed a significant increase in stiffness-damping factor but did not improve damping in flax laminates. According to the investigation, hybridization of conventional composites can lead to a significant increase in damping for both, double-T beams and airfoils. The damping can be increased by three to four times, and there can be a significant improvement in the damping-to-stiffness factor.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.