Abstract
We propose piezoelectric energy harvester (PEH) with double-cantilever-beam (DCB) undergoing coupled bending-torsion vibrations by combining width-splitting method and asymmetric mass, in order that more ambient energy could be harvested from environmental vibration with multiple-frequency excitation. The geometrical dimensions are optimized for PEHDCB, when the maximum of output peak voltages Up-max and resonance frequency difference (Δf0) between the first and second modes are chosen as optimization objectives based on orthogonal test method. The energy harvesting efficiency is evaluated by the proportion of half-power bandwidth and quality factor, and the experimental and simulation results are compared to verify reliability. The Up-max1 and Pp-max1 are increased 25.2% and 57.3% for PEHDCB under the multi-frequency excitation, when the split-width method is applied into PEH with single-cantilever-beam (SCB) undergoing coupled bending-torsion vibrations. The deviations of Up-max1 and f0 are at the ranges of 4.9–14.2% and 2.2–2.5% for PEHDCB under the different mass ratios, and the measurement reliability is acceptable considering incomplete clamping, damping and inevitable assembly effects. The energy harvesting efficiency of PEHDCB presented is much higher than that of the conventional PEHSCB from environmental vibration with multiple-frequency excitation.
Highlights
We propose piezoelectric energy harvester (PEH) with double-cantilever-beam (DCB) undergoing coupled bending-torsion vibrations by combining width-splitting method and asymmetric mass, in order that more ambient energy could be harvested from environmental vibration with multiplefrequency excitation
A unimorph cantilever beam undergoing bendingtorsion vibrations has been proposed by asymmetry increasing under a transverse harmonic base excitation to narrow the resonance frequency difference (Δf0) between first and second modes, it allows the harvesting of electrical power from multiple-frequency e xcitation[17]
Our result shows that bending torsional coupled vibration PEH can harvest more power than bending vibration PEH, which is consistent with the result reported[38]
Summary
Frequency excitation, and the results are similar with the experimental observations in the previous r eports[17,37]. For the same undergoing coupled bending-torsion vibrations, the Up-max and P p-max of PEHDCB are obviously larger than those of PEHSCB, and they are agreement with the simulation r eports[19,21]. The Q 1 and Q 2 of PEHDCB undergoing coupled bending-torsion vibrations are larger than those of PEHSCB undergoing bending vibration, and it indicates that the former could harvest the energy from the ambient vibration. The Up-max and f0 deviations are 14.2% and 2.6% for the PEHDCBs under the different mass ratios, as shown, the results are acceptable for the mechanical vibration experiment. There is an impact of fatigue life on the energy harvest from environmental vibration with a multiple-frequency excitation, and the fatigue life could be chosen as the indicative parameters at the multi-factors analysis the further work including experiment and simulation
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