Abstract
This paper presents an analysis of the hybrid piezoelectric-electromagnetic energy harvester (P-EMEH) driven by contactless rotary magnetic plucking. A lumped-parameter model of the hybrid P-EMEH is developed, and the model parameters are determined from the finite element analysis (FEA) method. A parametric study is conducted to investigate the effects of driving force parameters, load resistance, and electromechanical coupling strengths (EMCSs) on the maximal displacements and velocities, average power inputs and outputs, and energy efficiencies of the system for indicating the performance of the hybrid P-EMEH. The results show that the hybrid P-EMEH can obtain the improved power inputs by reducing the gyration radii of the rotary magnet and shortening the gaps between the two magnets. The structural vibrations can be strongly suppressed owing to the optimal piezoelectric power outputs, which can lead to the occurrence of valleys’ power of the electromagnetic element. At weak coupling, the hybrid P-EMEH can achieve higher power outputs than the single piezoelectric energy harvester (PEH) and the single electromagnetic energy harvester (EMEH). At strong coupling, the use of the PEH is more advantageous for energy harvesting due to wider power bandwidths at high dimensionless frequencies when compared with the hybrid P-EMEH. This work provides a fundamental understanding on the effect of load resistance and EMCSs on the dynamic and electrical characteristics of the magnetically plucked hybrid P-EMEH.
Highlights
With the rapid development of the self-sustained sensor networks and wireless communication technology, scavenging energy from the ambient environment to generate sustainable electricity for the low-power electronic devices and the wireless sensor nodes has received extensive attention
E significance of the analysis of the piezoelectric weak and strong coupling is that it provides a more comprehensive understanding on the power performance of the piezoelectric energy harvester (PEH) in different coupling regimes. e results from weak coupling analysis show the advantages of higher power outputs of the hybrid piezoelectric-electromagnetic energy harvester (P-electromagnetic energy harvester (EMEH)) when compared with the PEH and EMEH (see Figure 14(b)). e results from strong coupling analysis show the advantages of wider power bandwidths of the PEH at high dimensionless frequencies when compared with the hybrid P-EMEH and EMEH (see Figure 15(b))
We investigate the dynamics and electrical characteristics of a hybrid P-EMEH driven by rotary magnetic plucking. e lumped-parameter model of the hybrid P-EMEH is established, and the model parameters including ωn, k, m, kp2, J1, J2, and σ are determined based on the results from finite element analysis (FEA)
Summary
With the rapid development of the self-sustained sensor networks and wireless communication technology, scavenging energy from the ambient environment to generate sustainable electricity for the low-power electronic devices and the wireless sensor nodes has received extensive attention. In terms of the influence of system parameters, the studies on magnetically plucked rotational energy harvesters have mainly focused on excitation frequencies [16, 18], magnet arrangements [16,17,18,19,20,21], and rectified power estimation [22], while less attention has been paid on the effect of the load resistance and the mechanical coupling strength on the performance of the system, which is significant to design and optimize the magnetically plucked rotational energy harvester. Is work aims to conduct a comprehensive analysis of the effect of the load resistance and the EMCSs on the performance of the hybrid piezoelectric-electromagnetic energy harvester (P-EMEH) driven by the rotary magnetic plucking. Based on the determined parameters, a parametric study is performed to analyze the effects of the dimensionless load resistance and dimensionless EMCSs on the maximal displacements and velocities, average power inputs and outputs, and energy conversion efficiencies for indicating the performance of the hybrid P-EMEH. e power performance of the hybrid P-EMEH is investigated by comparison with the single PEH and the single EMEH at weak and strong couplings
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