Abstract
Energy harvesting in rotating environments is significant to realize the condition monitoring of mechanical equipment. In this paper, to accommodate the low-frequency rotating environment, a piezoelectric energy harvester with two magnetic coupled cantilevers perpendicular to each other is designed. The harvester exhibits the magnet-induced nonlinearity, centrifugal softening effect and passive adaptive barrier reduction effect. The influences of these characteristics on the dynamic performance are investigated comprehensively by establishing the electromechanical coupling equations in a rotational coordinate system through the extended Hamiltonian principle. The correctness of the mathematical model and simulation analysis is verified by experiments. Compared with single cantilever based harvester, the system output voltage is boosted by more than 10.56 times over the whole test frequency band (0.6–4 Hz). The significant enhancement of the energy scavenging capability proves its potential for low-frequency rotating applications.
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