An asymmetric magnetic-coupled bending-torsion piezoelectric energy harvester: modeling and experimental investigation

Abstract

This paper presents a detailed investigation on an asymmetric magnetic-coupled bending-torsion piezoelectric energy harvester based on harmonic excitation. There is an eccentricity between the shape center of moving magnets and the axis of the piezoelectric beam, which results in the bending and torsion simultaneously in working condition. The distributed mathematical model is derived from the energy method to describe the dynamic characteristics of the harvester, and the correctness of the model is verified by experiments. To further demonstrate the improvement performance of the proposed energy harvester, the bending-torsion energy harvester (i.e. magnetic-coupled was not configured) is experimented and compared. The theoretical and experimental results indicate that the average power increases about 300% but the resonance frequency decreases approximately 2 Hz comparing to the harvester without magnetic-coupled. According to the characteristic of distributed parameter model, the magnetic force and the size of the piezoelectric beam are investigated respectively. And the lumped-parameter model is introduced to analyze the steady-state characteristic. Accordingly, this paper provides a feasible method to improve performance for piezoelectric energy harvester.

Review on the Vibration Suppression of Cantilever Beam through Piezoelectric Materials

“…Considering the coupling effect between the axial deformation and lateral vibration of the beam itself, the energy method is widely used to build the system dynamic equation. [15] Such as Zhang et al [16] described the dynamic characteristics by energy method and analyzed the steady-state characteristics by lumpedstate. In short, the nonlinear vibration equation is obtained by the following methods mostly: Hamiltonian approach, [17] amplitudefrequency formulation, [18] and other classical methods.…”

Multistable vibration energy harvesters: Principle, progress, and perspectives

“…Nonlinear monostable vibration energy harvesters (one equilibrium position) and bistable vibration energy harvesters (BEH: 2 stable and 1 unstable equilibrium positions) were widely investigated, and their broadband advantages over the linear counterpart were verified in both simulation and experiments [31,32]. Especially, BEHs have been widely investigated via different designs [33][34][35][36]. For example, mutually attractive or repulsive magnets which are respectively attached to the free end of a piezoelectric beam and fixed to the base structure can obtain a beam-based BEH [32,33].…”

“…Especially, BEHs have been widely investigated via different designs [33][34][35][36]. For example, mutually attractive or repulsive magnets which are respectively attached to the free end of a piezoelectric beam and fixed to the base structure can obtain a beam-based BEH [32,33]. In addition, a clamped-clamped piezoelectric beam which is initially buckled by applying a longitudinal compressive displacement or axial precompression can exhibit bistable characteristics [34].…”

Vibration Energy Harvesting from the Subwavelength Interface State of a Topological Metamaterial Beam

“…The second one is nonlinear energy harvesting, which mainly uses the unique features of nonlinear systems to attain bandwidth enlargement. For example, based on the duffing oscillator, monostable vibration energy harvesters (VEHs) [10][11][12][13], bistable VEHs [14][15][16], tristable VEHs [17][18][19] and multistable VEHs [20,21] have been developed. The main advantage of the duffing-type nonlinear VEHs is that the high energy oscillation can exhibit over a very wide band.…”