Saw-tooth type piezoelectric multi-modal energy harvester

Mažeika, Dalius; Čeponis, Andrius; Vasiljev, Piotr; Borodinas, Sergėjus; Pliuskuvienė, Birutė

doi:10.1016/j.sna.2019.02.009

Cited by 6 publications

(8 citation statements)

References 12 publications

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“…is the piezoelectric constant matrix, is the dielectric matrix at constant strain, is the elastic stiffness matrix of the piezoelectric material at null electric field and is the elastic stiffness matrix of the substrate material. is the mass per unit of length of the beam (substrate and piezoelectric layers) defined in (16) where and are densities of the piezoelectric material and the substrate respectively. ).…”

Section: Rayleigh-ritz Methodsmentioning

confidence: 99%

“…Although nonlinear or bistable mechanical harvesters are effective in overcoming the narrow bandwidth limitation of classical resonator-based vibration energy harvester, they are dependent on the input amplitude [14,15], and multi-degree of freedom harvesters suffer from low power densities [16]. Only a small tuning range could be achieved in the early stages of resonant frequency tuning by electrical methods [17], but recent works in the field make them increasingly interesting for broadband vibration energy harvesting.…”

Section: Introductionmentioning

confidence: 99%

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Strongly coupled piezoelectric cantilevers for broadband vibration energy harvesting

et al. 2020

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Vibration energy harvesters based on piezoelectric resonators are promising for powering Wireless Sensors Nodes (WSNs). Yet, any mismatch between the resonant frequency of traditional harvesters and the vibration frequency can drastically decrease the scavenged power and make them ineffective. Electrical techniques able to tune the resonant frequency of piezoelectric harvesters has been proposed as a solution and opens up new perspectives. To be fully competitive, this approach requires energy harvesters with very strong global electromechanical coupling coefficients k² (>10%), whose design remains a challenge today. This work reports on a method to design strongly coupled piezoelectric cantilevers thanks to an analytical approach based on the Rayleigh-Ritz method and a two degrees-of-freedom model, which considers the proof mass inertia effects. Through an expression of the coupling coefficient, we provide design guidelines, which are experimentally validated. We show that a long proof mass is a very effective configuration to maximize the global electromechanical coupling coefficient and consequently the frequency bandwidth of the system. Three proposed prototypes exhibit some of the strongest squared global electromechanical coupling coefficients k² of the state-of-the-art of piezoelectric harvesters (16.6% for the PMN-PT cantilever, 11.3% and 16.4% for the narrow and wide PZT-5A cantilevers respectively) and demonstrate a wide bandwidth behavior (10.1%, 7.8% and 11.3% of the central frequency respectively). Using a strongly coupled prototype based on PZT-5A leveraged by a dedicated integrated circuit, we experimentally show that it can harvest enough power (more than 100µW) to supply a WSN over a frequency bandwidth as large as 21%.

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Section: Rayleigh-ritz Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strongly coupled piezoelectric cantilevers for broadband vibration energy harvesting

et al. 2020

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“…A structure with multiple resonant frequencies may be considered for energy harvesting from random vibrations with multiple resonant peaks; for example, a segmented composite beam with embedded piezoelectric layers [18], V-shaped and open deltashaped plates with attached magnets [19], trunk-shaped beam structures [20], and zigzag beams [21][22][23]. Karami and Inman [24] proposed a zigzag microstructure that had several resonant frequencies, ranging from 100 Hz to 1000 Hz.…”

Section: Introductionmentioning

confidence: 99%

Design of a Bézier-Profile Plate for Closely Spaced Multimodal Vibration Energy Harvesting

Nguyen¹,

Wang

2021

Energies

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A cubic Bézier-profile plate for multimodal vibration energy harvesting was developed. The design of the plate was based on an optimization procedure in which the profile of the plate was optimized via the parameters of a cubic Bézier curve to meet the requirements. The multimodal energy harvesting of the plate exploited its first bending mode and its first twisting mode. The conversion of vibration energy into electrical energy was by electromagnetic induction with a magnet attached to a corner of the plate. These two closely spaced vibration modes achieved the multi-modal energy harvesting of the device. Prototypes of the device were manufactured using a numerical-control machining process. The experimental results were in good agreement with the design specifications. With the same base lengths, height, and thickness, the maximum von Mises stress of the proposed plate was much lower due to its bell-shaped profile. The cubic Bézier curve chosen for the plate profile was effective for design of the closely-spaced multimodal vibration energy harvester. With the flexibility of its controllable parametric curve, a high design freedom of the energy harvester with specified frequency ratios could be achieved.

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“…Because the sizes of the branches are different, the whole structure has four modes in the low frequency range. In 2019, Dalius et al [34] proposed a saw-tooth multi-mode PEH. The structure consists of four cantilever beams with saw-tooth crosssections that are head-to-tail connected rigidly.…”

Section: Introductionmentioning

confidence: 99%

Design and study of rigid-flexible coupled piezoelectric energy harvester

Chen

Chang

Hao

et al. 2020

Smart Mater. Struct.

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Attaching a rigid frame to two cantilever plates, a compact piezoelectric energy harvester (PEH) with wide bandwidth is proposed in this paper. Three different arrangement form and section shape of the two cantilever plates, such as, symmetrical uniform section rectangle, symmetrical variable section trapezoid and anti-symmetrical variable section are designed. Considering the frame as a rigid body and the cantilever plate as a deformed body, natural frequencies, modes and output voltages of the structures are calculated using finite element software ABAQUS. It is found that the anti-symmetrical trapezoidal cantilever plate surrounded by rigid frame, has lower natural frequency, more working frequency bands in low frequency range and the highest output voltage. According to the simulation results, prototype of PEH with anti-symmetrical trapezoidal cantilever plate surrounded by rigid frame is processed and fixed to the vibration platform using custom fixture. Through sweep test, open-circuit output voltage of PEH at different frequencies is measured using oscilloscope and the first three order natural frequencies are obtained. The results meets the design requirements of multilevel natural frequency and high output voltage in low frequency range. This research provides theoretical and experimental basis for the engineering application of the PEH.

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Saw-tooth type piezoelectric multi-modal energy harvester

Cited by 6 publications

References 12 publications

Strongly coupled piezoelectric cantilevers for broadband vibration energy harvesting

Strongly coupled piezoelectric cantilevers for broadband vibration energy harvesting

Design of a Bézier-Profile Plate for Closely Spaced Multimodal Vibration Energy Harvesting

Design and study of rigid-flexible coupled piezoelectric energy harvester

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