A small-form-factor piezoelectric vibration energy harvester using a resonant frequency-down conversion

Sun, Kyung Ho; Kim, Young‐Cheol; Kim, Jae Eun

doi:10.1063/1.4898662

Cited by 9 publications

(7 citation statements)

References 15 publications

(14 reference statements)

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“…In [31] the concept of the dynamic magnifier was applied to cantilever harvesters. In [32] a cantilever harvester with tip mass was mounted on a supporting beam for lowering the first natural frequency of the integrated system.…”

Section: Introductionmentioning

confidence: 99%

Development of Piezoelectric Harvesters with Integrated Trimming Devices

et al. 2018

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Featured Application: Trimming devices integrated with the structural layer of the harvester are proposed for improving energy harvesting at low frequency and in the presence of periodic excitation with multiple harmonics. Abstract: Piezoelectric cantilever harvesters have a large power output at their natural frequency, but in some applications the frequency of ambient vibrations is different from the harvester's frequency and/or ambient vibrations are periodic with some harmonic components. To cope with these operating conditions harvesters with integrated trimming devices (ITDs) are proposed. Some prototypes are developed with the aid of an analytical model and tested with an impulsive method. Results show that a small trimming device can lower the main resonance frequency of a piezoelectric harvester of the same extent as a larger tip mass and, moreover, it generates at high frequency a second resonance peak. A multi-physics numerical finite element (FE) model is developed for predicting the generated power and for performing a stress-strain analysis of harvesters with ITDs. The numerical model is validated on the basis of the experimental results. Several configurations of ITDs are conceived and studied. Numerical results show that the harvesters with ITDs are able to generate relevant power at two frequencies, owing to the particular shape of the modes of vibration. The stress in the harvesters with ITDs is smaller than the stress in the harvester with a tip mass trimmed to the same frequency.

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Section: Introductionmentioning

confidence: 99%

Development of Piezoelectric Harvesters with Integrated Trimming Devices

et al. 2018

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“…The possibility of developing harvesters tuned to the harmonic components of periodic vibrations was studied in [15]. The possibility of lowering the first resonant frequency of the harvester was analysed in [17,32].…”

Section: Harvester Tuning To the Bicyclementioning

confidence: 99%

Energy Harvesting from Bicycle Vibrations by Means of Tuned Piezoelectric Generators

Doria¹,

Marconi²,

Moro³

2020

Electronics

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Vibrations of two typical bicycles are measured by means of road tests in bicycle lanes. The analysis of experimental results in terms of power spectral density (PSD) of the acceleration components shows that most of the energy associated to bicycle vibrations is concentrated in a low frequency band (<30 Hz). Since piezoelectric cantilever harvesters achieve the best performance in resonance and the resonant frequency is well above 30 Hz, specific tuning strategies are adopted. A novel mathematical model for simulating the electro-mechanical behaviour of a piezoelectric harvester equipped with an auxiliary oscillator is proposed. Calculated results show the potentialities of this tuning device in terms of generated voltage and stress inside the piezoelectric layer. Prototypes of harvesters equipped with auxiliary oscillators are built and tested in the laboratory obtaining the frequency response function (FRF) of generated voltage. Finally, the average electric power generated by these harvesters (which are assumed to be interfaced to an electronic load by a power management unit based on synchronous rectifying technique) is simulated by using the measured FRFs and PSDs of bicycle vibrations.

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“…The non-linearity of the transducer and the change of the mechanical damping ratio can cause a change in the resonant frequency and the optimal load impedance of the transducer. The second explanation for the results could be described by the ideal linear modelling exploited in this paper for the transducer, in which the analysis model does not fully consider the impedance variation caused by the deviation of the material properties used for the transducer fabrication; for example, the elastic modulus of the cantilever and the initial relative permeability of the magnetic cores [27,28]. Table 1 summarises the output power of the two energy transducers, based on a numerical model, the simulation by the commercial simulator, COMSOL Multiphysics, and the measurements at acceleration levels of 0.4g and 0.5g.…”

Section: Implementation and Measurementmentioning

confidence: 99%

Study on electromagnetic energy transducer in ambient vibration

Choi

Kim

Park

et al. 2018

IET Power Electronics

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This study documents the design of an electromagnetic energy transducer, which is used to convert ambient vibration into electrical energy. The response of the designed energy transducer is theoretically and experimentally analysed using a simple equivalent circuit model and magnetic field simulator in low-acceleration environments. For an electromagnetic energy transducer in ambient vibration, an approximate analytical expression is derived for the extracted power across a load. The energy transducer consists of four magnets (NdFeB, N35), two I-shaped magnetic cores, two U-shaped cores made of soft ferrite material, and a coil for induced voltage. The two U-shaped magnetic cores are surrounded by a coil with an approximate 3000 turn. The energy transducer is theoretically modelled using the commercial tool, COMSOL, and is experimentally validated through electrical measurements. The relation between the acceleration of vibration and the maximum average power that can be extracted at the optimal load was also studied. The size of the electromagnetic energy transducer is 43 × 37 × 80 mm 3. The energy transducer has a maximum average power of 3.24 mW at a frequency of 28 Hz and an acceleration of 0.4g, and has a maximum average power of 3.83 mW at a frequency of 31 Hz and an acceleration of 0.5g.

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A small-form-factor piezoelectric vibration energy harvester using a resonant frequency-down conversion

Cited by 9 publications

References 15 publications

Development of Piezoelectric Harvesters with Integrated Trimming Devices

Development of Piezoelectric Harvesters with Integrated Trimming Devices

Energy Harvesting from Bicycle Vibrations by Means of Tuned Piezoelectric Generators

Study on electromagnetic energy transducer in ambient vibration

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