Investigation on various beam geometries for piezoelectric energy harvester with two serially mounted piezoelectric materials

Pradeesh, E. L.; Udhayakumar, S.; Sathishkumar, C.

doi:10.1007/s42452-019-1709-4

Cited by 10 publications

(6 citation statements)

References 30 publications

(35 reference statements)

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“…In the following, a simplified mechanical model is proposed which allows to investigate the equilibrium points and to estimate the resonant frequencies of the linearized system, besides deriving the conditions under which bistability occurs. Without loss of generality, yet simplifying the treatment, damping, which in principle could be included both analytically [42] or through simulations [43,44], is neglected. Section 2.1 treats the array with the magnet fixed on the base, while section 2.2 treats the array with the magnet elastically suspended on the base through the spring.…”

Section: Theory Of Operationmentioning

confidence: 99%

Multi-frequency array of nonlinear piezoelectric converters for vibration energy harvesting

Baù

Alghisi

Dalola

et al. 2020

Smart Mater. Struct.

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Energy harvesting from wideband and random vibrations demands for techniques and solutions to overcome limitations of linear converters, which best operate when the frequency of vibrations matches the resonant frequency of the converter. Viable approaches comprise, among others, the use of array of linear harvesters with different resonant frequencies, the adoption of nonlinear techniques or the exploitation of mechanically coupled converters. This work proposes a piezoelectric energy harvester where the combination of such techniques is explored in a unique device. The harvester is composed of an array of four piezoelectric cantilevers fabricated by screen printing lead zirconate titanate (PZT) films on a stainless steel substrate. Nonlinear behavior of the cantilevers is achieved by exploiting the interaction between a magnet and their ferromagnetic steel substrate. Two configurations have been analyzed where the magnet is either fixed on the harvester base, or it is elastically suspended through a spring on the harvester base. The latter configuration introduces a mechanical coupling among the cantilevers. For the experimental characterization, the prototype has been excited by band-pass filtered white-noise mechanical vibrations in the range 10-100 Hz with amplitude in the range 0.1-2.2 g. The obtained experimental results show that the rms values of the open-circuit output voltage for each cantilever increase in the nonlinear configuration and it can be up to 215% higher for the case with the elastically suspended magnet compared to the case of the same array operated in linear regime.

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Section: Theory Of Operationmentioning

confidence: 99%

Multi-frequency array of nonlinear piezoelectric converters for vibration energy harvesting

Baù

Alghisi

Dalola

et al. 2020

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Equations (8)(9)(10)(11) are combined into equations ( 12) and ( 13) with the consideration of equations (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25) with the respective defined values for K. The electromechanical equations of motion are found using the Euler-Lagrange relations as:…”

Section: Modeling Of Crack Impacted Piezoelectric Energy Harvestersmentioning

confidence: 99%

“…Vibrational piezoelectric energy harvesters are continually being developed into architectures to scavenge ambient energy from a defined scenario [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. There are a multitude of designs which target wasted mechanical vibrations produced by some base-structure, fluid-structure, or magneto-structure interaction [7,21,22].…”

Section: Introductionmentioning

confidence: 99%

Insights on the crack modeling and effectiveness of piezoelectric energy harvesters

Salazar¹,

Larkin²,

Abdelkefi³

2020

Smart Mater. Struct.

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A damage model for investigating the performance of cracked piezoelectric vibrational energy harvesters (VEHs) is developed. The crack model adopted does not alter the piezoelectric properties of the lead zirconate titanate patch but modifies the structural stiffness at the crack location following the Griffith’s strain release formulation. Multiple VEH configurations are considered to determine how the performance of various sized piezoelectric patches are impacted by multiple edge cracks. It is demonstrated that thicker piezoelectric patches are more severely impacted by cracks than thinner patches. The number of cracks, proximity of the cracks to the base of the VEH, and crack depth are shown to affect VEH performance. It is shown that severe cracks have a pronounced influence on the stiffness of the energy harvesting system, thus causing a deviation in the resonance region and amplitudes of the damaged system. The increased flexibility of the cracked piezoelectric patches increases the tip deflection and decreases the resonant frequency which can shift the initial optimal resistance to some higher value thus, greatly affecting the efficiency of piezoelectric energy harvesters.

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“…The effects of the length, thickness, and width of the piezoelectric layer were also analyzed in the literature, which indicated that the natural frequency of the triangular beam was the highest for all the considered parameters due to the mechanical properties of the beams. According to the results, the thickness of the harvesting beam's layers affected the energy harvesting performance [33]. The homogenization of the distributions of axial strains along the beams improved the output power of energy harvesting.…”

Section: Introductionmentioning

confidence: 98%

Analysis of Energy Harvesting Enhancement in Piezoelectric Unimorph Cantilevers

Rahimzadeh

Samadi

Mohammadi

2021

Sensors

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Environmental energy harvesting is a major operation in research and industries. Currently, researchers have started analyzing small-scale energy scavengers for the supply of energy in low-power electrical appliances. One area of interest is the use of piezoelectric materials, especially in the presence of mechanical vibrations. This study analyzed a unimorph cantilever beam in different modes by evaluating the effects of various parameters, such as geometry, piezoelectric material, lengths of layers, and the proof mass to the energy harvesting process. The finite element method was employed for analysis. The proposed model was designed and simulated in COMSOL Multiphysics, and the output parameters, i.e., natural frequencies and the output voltage, were then evaluated. The results suggested a considerable effect of geometrical and physical parameters on the energy harvesters and could lead to designing devices with a higher functional efficiency.

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Investigation on various beam geometries for piezoelectric energy harvester with two serially mounted piezoelectric materials

Cited by 10 publications

References 30 publications

Multi-frequency array of nonlinear piezoelectric converters for vibration energy harvesting

Multi-frequency array of nonlinear piezoelectric converters for vibration energy harvesting

Insights on the crack modeling and effectiveness of piezoelectric energy harvesters

Analysis of Energy Harvesting Enhancement in Piezoelectric Unimorph Cantilevers

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