A comprehensive review on mechanical amplifier structures in piezoelectric energy harvesters

Long, Su Xian; Khoo, Shin Yee; Ong, Zhi Chao; Soong, Ming Foong; Huang, Yu-Hsi; Prasath, Nithiyanandam; Noroozi, Siamak

doi:10.1080/15376494.2023.2243674

Cited by 5 publications

(2 citation statements)

References 143 publications

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“…The energy conversion efficiency, η, of the Hull PEH was calculated via equations from [22] based on the average input and output energies. The energy conversion efficiency was determined by analyzing the mechanical input response obtained from the accelerometer and impact hammer.…”

Section: Efficiencymentioning

confidence: 99%

“…It covers various areas including material composition, innovative mechanisms for more efficient motion conversion, amplifier frame structural designs, the frequency tuning method, and improvements in electronic components such as electrode polarization methods and energy storage solutions. Long [22] summarized the various types of mechanical amplifier structures for the piezoelectric energy harvester (PEH), ranging from the cantilever and flexure to multistage types as shown in Figure 1. The flextensional structures, namely the Cymbal [23,24] and Rhombus [25][26][27], have been widely applied in high-force environments due to their robust structure capable of withstanding high stress.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Investigation of a Compressive-Mode Hull Piezoelectric Energy Harvester under Impact Force

Long,

Khoo,

Ong

et al. 2023

Sustainability

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In recent years, much research has been carried out to enhance the efficiency of the piezoelectric energy harvester (PEH). This study focuses on the performance of the compressive Hull PEH under impact forces, which simulates real-world scenarios, such as foot strikes or vehicular wheel excitations, more accurately compared to harmonic forces. The experimental results prove the performance of the Hull PEH with less than 5.2% of deviation compared to finite element analysis outcomes under impact forces between 10 N and 1 kN. The Hull PEH more substantially amplified the input force and compressed the piezoelectric material, which was Lead Zirconate Titanate (PZT). Consequently, it amplified the voltage output of a standalone PZT up to 16.9 times under a similar boundary condition. A maximum peak power output of 7.16 W was produced across 50 kΩ of optimum load resistance under 1 kN of impact force, which surpassed the benchmark Cymbal PEH by 37.68 times. Furthermore, it demonstrated a higher energy conversion efficiency of 84.38% under the impact force compared to the harmonic force. This research conclusively proves that the Hull PEH has superior performance in terms of voltage output, power output, loading capacity, and efficiency, making it a promising technology for impact loading applications to generate green energy.

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Section: Efficiencymentioning

confidence: 99%