Abstract
Wave energy harvesting plays a crucial part in promoting the sustainable development of marine fisheries. This paper presents a novel hybrid electromagnetic and piezoelectric Self-powered Sensor, known as the Smart Nodding Duck (SND). The SND consists primarily of two components: an electromagnetic generator (EMG) responsible for power generation and a piezoelectric generator (PEG) dedicated to monitoring purposes. The SND absorbs wave energy through the shell of the nodding duck, while the planetary wheel system forms a coaxial counter-rotating augmentation structure. Also, the Halbach magnetic array serves as the electromagnetic generator, simultaneously exciting the piezoelectric structure to generate voltage signals. These features enable the SND to contribute to the LSTM network modeling self-sensing system, facilitating the monitoring of sea states. To verify the power generation effect of the SND, we conducted bench tests. The results demonstrate that the electromagnetic generator achieves an average output power of 96.26mW under a wave excitation of 0.8 Hz with an amplitude of 80 mm, yielding a power density of 16 W/m3. Furthermore, the self-sensing sea state monitoring model exhibits an impressive accuracy of 99.3 %. Moreover, tank experiment verified the feasibility of the SND, further contributing to the construction of a smart marine fishery Internet of Things.
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