Lift augmentation by incorporating bend twist coupled composites in flapping wing

TL;DR

This paper introduces a bio-inspired bend-twist coupling technique in composite wings that significantly enhances lift and efficiency in flapping wing systems, with potential applications in biomimetic drones and micro-air vehicles.

Contribution

It presents a novel composite laminate design utilizing bend-twist coupling to maximize lift without external mechanisms, validated through optimization and vortex analysis.

Findings

Lift increased by up to five times compared to curved wings.

Significant efficiency improvement within reduced frequency range 0.25-0.4.

Provides insights into vortex dynamics and structural stress behavior.

Abstract

Drawing inspiration from the adaptive wing shape of birds in flight, this study introduces a bio-inspired concept for shape adaptation utilizing bend-twist coupling (BTC) in composite laminates. The primary aim of the design optimization is to identify the optimal fibre orientation angles needed to produce the required bending and twisting deformations, which directly contribute to the design's goal of maximizing lift without relying on external mechanisms for twisting. This novel technique increases lift by up to five times compared to a curved bending wing. We have highlighted the vortex dynamics to provide insight into the underlying reasons for such a significant lift increment. In addition, the study presents the Von Mises stress experienced by the wing, offering a comprehensive understanding of the structural behavior. Furthermore, it highlights a significant improvement in efficiency, particularly within the optimal reduced frequency range of 0.25 to 0.4. These findings underscore the potential of this method for future applications in biomimetic drones, micro-air vehicles, and other flapping wing-based systems, ultimately paving the way for new advancements in aerodynamics and structural optimization for next-generation aerial vehicle designs.