Improved energy harvesting from a clamped–clamped micro beam with cavity

Yenuganti, Sujan; Peparthi, M.

doi:10.1007/s00542-020-05075-2

Cited by 1 publication

(1 citation statement)

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“…By moving the proof mass, it can broaden the frequency band and adaptively adjust the natural frequency of the system to match external excitation. In 2020, Yenuganti S [ 22 ] used a doubly clamped beam as an elastic structure for ambient low power excitation vibrational energy harvesting, which introduced a cavity along its thickness direction. Both analytical and numerical analyses revealed that the clamped-clamped micro beam (CCMB) with cavity yield a higher output voltage as compared to the CCMB without cavity.…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of a Doubly Clamped Flexible Piezoelectric Energy Harvester with Axial Excitation and Its Experimental Characterization

Mei

Fan

et al. 2021

Sensors

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With the rapid development of wearable electronics, novel power solutions are required to adapt to flexible surfaces for widespread applications, thus flexible energy harvesters have been extensively studied for their flexibility and stretchability. However, poor power output and insufficient sensitivity to environmental changes limit its widespread application in engineering practice. A doubly clamped flexible piezoelectric energy harvester (FPEH) with axial excitation is therefore proposed for higher power output in a low-frequency vibration environment. Combining the Euler–Bernoulli beam theory and the D’Alembert principle, the differential dynamic equation of the doubly clamped energy harvester is derived, in which the excitation mode of axial load with pre-deformation is considered. A numerical solution of voltage amplitude and average power is obtained using the Rayleigh–Ritz method. Output power of 22.5 μW at 27.1 Hz, with the optimal load resistance being 1 MΩ, is determined by the frequency sweeping analysis. In order to power electronic devices, the converted alternating electric energy should be rectified into direct current energy. By connecting to the MDA2500 standard rectified electric bridge, a rectified DC output voltage across the 1 MΩ load resistor is characterized to be 2.39 V. For further validation of the mechanical-electrical dynamical model of the doubly clamped flexible piezoelectric energy harvester, its output performances, including both its frequency response and resistance load matching performances, are experimentally characterized. From the experimental results, the maximum output power is 1.38 μW, with a load resistance of 5.7 MΩ at 27 Hz, and the rectified DC output voltage reaches 1.84 V, which shows coincidence with simulation results and is proved to be sufficient for powering LED electronics.

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Section: Introductionmentioning

confidence: 99%