Snap-Through Buckling Mechanism for Frequency-up Conversion in Piezoelectric Energy Harvesting

Speciale, Alessandro; Ardito, Raffaele; Baù, Marco; Ferrari, Maurizio; Ferrari, Vittorio; Frangi, Attilio

doi:10.3390/app10103614

Cited by 23 publications

(11 citation statements)

References 35 publications

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“…The results confirm the effectiveness of magnetic FuC and show that the repulsive case a piezoelectric buckled beam that can operate for a random input vibration, with huge gain in terms of power generation with respect to the unbuckled device. Recently, Speciale et al [11] proposed a snapthrough buckling mechanism that can activate the natural vibration of a transducer attached to the bistable structure. Xu et al [12] realized a piezoelectric MEMS buckled beam that operates below 100 Hz.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental evaluation of the magnetic interaction for frequency up-conversion in piezoelectric vibration energy harvesters

2022

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The purpose of this work is to improve the modelling process for the application of permanent magnets in a frequency up-conversion (FuC) mechanism for piezoelectric energy harvesters. More specifically, the aim is to avoid the burdensome finite element analyses (FEA) in the framework of electromechanical devices design. The analytical calculations are compared with experimental tests conducted by an ad-hoc set up and with FEA. After investigations on the interaction, an application of FuC mechanism is proposed on a meso-scale case study in which a low frequency seismic mass (LFM) interacts non-linearly, due to magnetic field, with an high frequency piezoelectric vibration energy harvester (PVEH). Numerical simulations have been carried out in the time domain (step-by-step analysis) under a harmonic low-frequency input acceleration signal. The peculiar behavior, due to non-linear dynamics, is investigated in both the repulsive and the attractive configurations of the magnets. The results confirm the effectiveness of magnetic FuC and show that the repulsive case allows the device to recover a larger amount of energy than the attractive configuration.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental evaluation of the magnetic interaction for frequency up-conversion in piezoelectric vibration energy harvesters

2022

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“…This frequency mismatch leads to the suboptimal effectiveness of the harvester. To overcome this issue, different studies in the literature propose the adoption of frequency up-conversion [ 17 ], which can be achieved via the non-linear behaviour of structural elements [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], buckling [ 21 , 22 , 23 , 24 ], and magnetic interaction [ 25 , 26 , 27 , 28 ]. In other cases, with the purpose of increasing the scavenged energy, arrays of resonant converters are proposed [ 29 , 30 , 31 , 32 ], and the adoption of special metamaterials is introduced [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Optimization of an Impact-Based Frequency Up-Converted Piezoelectric Vibration Energy Harvester for Wearable Devices

Aceti

Rosso

Ardito

et al. 2023

Sensors

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This work presents a novel development of the impact-based mechanism for piezoelectric vibration energy harvesters. More precisely, the effect of an impacting mass on a cantilever piezoelectric transducer is studied both in terms of the tip mass value attached to the cantilever and impact position to find an optimal condition for power extraction. At first, the study is carried out by means of parametric analyses at varying tip mass and impact position on a unimorph MEMS cantilever, and a suitable physical interpretation of the associated electromechanical response is given. The effect of multiple impacts is also considered. From the analysis, it emerges that the most effective configuration, in terms of power output, is an impact at the cantilever tip without a tip mass. By changing the value of the tip mass, a sub-optimal impact position along the beam axis can also be identified. Moreover, the effect of a tip mass is deleterious on the power performance, contrary to the well-known case of a resonant energy harvester. A mesoscale prototype with a bimorph transducer is fabricated and tested to validate the computational models. The comparison shows a good agreement between numerical models and the experiments. The proposed approach is promising in the field of consumer electronics, such as wearable devices, in which the impact-based device moves at the frequencies of human movement and is much lower than those of microsystems.

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“…Furthermore, typical human movements often have a nonperiodical or random behavior over a frequency bandwidth, typically not exceeding a few hertz [ 38 ], thus limiting the practical adoption of linear energy harvesters of acceptable size. To overcome these frequency mismatches, different approaches have been developed, such as the adoption of eccentric weight [ 39 ], nonlinear mechanisms [ 40 , 41 , 42 ], or the use of impact-based and frequency-up conversion techniques [ 43 , 44 , 45 , 46 ]. An energy harvester system with eight nonlinear lead zirconate titanate (PZT) buckled bridges has been employed to power a commercial tire pressure monitoring systems in real time [ 47 ].…”

Section: Introductionmentioning

confidence: 99%

Wearable Ball-Impact Piezoelectric Multi-Converters for Low-Frequency Energy Harvesting from Human Motion

Nastro

Pienazza

Baù

et al. 2022

Sensors

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Multi-converter piezoelectric harvesters based on mono-axial and bi-axial configurations are proposed. The harvesters exploit two and four piezoelectric converters (PCs) and adopt an impinging spherical steel ball to harvest electrical energy from human motion. When the harvester undergoes a shake, a tilt, or a combination of the two, the ball hits one PC, inducing an impact-based frequency-up conversion. Prototypes of the harvesters have been designed, fabricated, fastened to the wrist of a person by means of a wristband and watchband, and experimentally tested for different motion levels. The PCs of the harvesters have been fed to passive diode-based voltage-doubler rectifiers connected in parallel to a storage capacitor, Cs = 220 nF. By employing the mono-axial harvester, after 8.5 s of consecutive impacts induced by rotations of the wrist, a voltage vcs(t) of 40.2 V across the capacitor was obtained, which corresponded to a stored energy of 178 μJ. By employing the bi-axial harvester, the peak instantaneous power provided by the PCs to an optimal resistive load was 1.58 mW, with an average power of 9.65 μW over 0.7 s. The proposed harvesters are suitable to scavenge electrical energy from low-frequency nonperiodical mechanical movements, such as human motion.

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Snap-Through Buckling Mechanism for Frequency-up Conversion in Piezoelectric Energy Harvesting

Cited by 23 publications

References 35 publications

Numerical and experimental evaluation of the magnetic interaction for frequency up-conversion in piezoelectric vibration energy harvesters

Numerical and experimental evaluation of the magnetic interaction for frequency up-conversion in piezoelectric vibration energy harvesters

Optimization of an Impact-Based Frequency Up-Converted Piezoelectric Vibration Energy Harvester for Wearable Devices

Wearable Ball-Impact Piezoelectric Multi-Converters for Low-Frequency Energy Harvesting from Human Motion

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