Bioinspired twist-hyperbolic metamaterial for impact buffering and self-powered real-time sensing in UAVs

Turbulence-induced vibrations pose substantial risks to aircraft structural integrity and flight stability, particularly in unmanned aerial vehicles (UAVs), where real-time impact monitoring and lightweight protection are critical. Here, we present a bioinspired twist-hyperbolic metamaterial (THM) integrated with a triboelectric nanogenerator (TENG) for simultaneously impact buffering and self-powered sensing. The THM-TENG protector exhibits tunable stiffness (40 to 4300 newtons per millimeter), ~70% impact energy absorption, and achieves a specific energy absorption of ~0.25 joules per gram at a weight of only 10 grams. Through triboelectrification, the protector converts mechanical energy into electrical signals, enabling real-time monitoring of impact loads up to 1000 newtons (≤5 hertz). Integrated with a microcontroller unit, wireless transmission, and alarm systems, THM-TENG demonstrates dual functionality in UAVs: mitigating vibration while providing real-time force monitoring, positioning, and early warning, all without external power sources. This work establishes a transformative framework for lightweight, multifunctional protective systems with applications in aerospace, robotics, and autonomous vehicles.