Research on a vortex-induced vibration monitoring sensor technology based on triboelectric nanogenerator

Vortex induced vibration is the main cause of fatigue damage in underwater structures , and monitoring of underwater structures is to ensure their safety. There is a lack of an underwater power supply system , and the cylindrical structure often experiences irregular vibrations, limiting traditional vibration monitoring . This article proposes a particle type vibration monitoring sensor for vibration monitoring. The experiment discussed the self-powering and motion capture of RF-TENG under different particle diameters, filling ratios, and vibration modes , obtaining the following conclusions: (1) Particle diameter and filling ratio affect the vibration monitoring capability, and the influencing mechanism is related to the agglomeration effect. A container with a diameter of 111 mm has better overall performance when selecting a particle diameter of 15 mm (2) Both voltage and current have the ability to monitor cylinder displacement vibration, but voltage is better. Filtering can eliminate low-frequency noise, but high-frequency noise is relatively difficult. (3) When the filling rate is between 50 % and 70 %, the sensor can capture more than 90 mW/m 2 of energy in the upper branch, while possessing motion capture and self powered performance. The results verified the feasibility of RF-TENG as a self powered vibration monitoring sensor, providing a new approach for underwater structural monitoring. • Self-powered VIV sensor based on RF-TENG effectively captures VIV through particle movement. • Optimal particle diameter (15 mm) and filling rate (60 %–80 %) enhance RF-TENG sensor performance. • RF-TENG sensor achieves ≥90 mW/m 2 output with high motion capture accuracy, enabling efficient self-powered monitoring.