An eccentric rotational energy harvester using liquid as an energy-capturing medium

Xia, Hu; Yang, Fan; Yang, Chun Cheng; Qin, Lifeng; Zhang, Jinhui

doi:10.1016/j.enconman.2022.115759

Cited by 10 publications

(10 citation statements)

References 50 publications

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“…Contact energy harvester has a stable energy conversation mode and a lower cost. Still, it has some disadvantages such as damage to the energy harvester unit due to forces and collisions during operation [18]. Non-contact energy harvesters are also widely used in several fields due to the high energy conversion rates and wider operating frequencies.…”

Section: Introductionmentioning

confidence: 99%

A piezoelectric energy harvester with parallel connection using beams of different lengths to improve output performance

Wang,

2024

Smart Mater. Struct.

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The purpose of this paper is to design an energy harvester to improve output performance. The theoretical analysis of the piezoelectric energy harvester has been performed. Reducing the length of one cantilever beam, thereby changing the relative impact position, causing the amplitude of the two cantilever beams to be different, and making the waveform of two beams different. Some experiments have been tested to verify the feasibility of the device and compare the differences with Plan A. Based on the experiment, it can be concluded that the output voltage is higher at both high and low speeds. When the rotation speed is 255 r min−1, Plan B arrives at the optimum speed, and the maximum output voltage is 166.2 V, which significantly increases from 97.2 V of Plan A. The maximum output power is 0.966 W under the load resistance of 10 kΩ. The maximum voltage is 157.7 V under the load resistance of 120 kΩ. Nevertheless, the maximum voltage and maximum power of Plan A are 92.62 V and 0.52 W. Besides, the prototype has fewer materials and nearly 1.5 times the energy conversion rate compares to Plan A. It can light up 42 LEDs easily and can adapt to environmental vibration frequency changes, so it has an intensely adaptable and outstanding performance in practical applications.

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Section: Introductionmentioning

confidence: 99%

A piezoelectric energy harvester with parallel connection using beams of different lengths to improve output performance

Wang,

2024

Smart Mater. Struct.

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“…Consequently, the conversion of environmental vibration into electrical energy has emerged as a prominent research focus for both domestic and international scholars [8][9][10]. Currently, vibration energy harvesting can be categorized into four fundamental types based on different modes of energy conversion: electrostatic, electromagnetic, thermoelectric, and piezoelectric [11][12][13]. Each method of energy harvesting possesses its own advantages and disadvantages; however, the piezoelectric vibration energy harvester stands out due to its simplistic structure, high output energy density, and ease in achieving structural miniaturization.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental investigation of a positive feedback magnetic-coupled piezoelectric energy harvester

Shi,

Chen,

et al. 2024

Smart Mater. Struct.

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A positive feedback magnetic-coupled piezoelectric energy harvester is proposed to address the limitations of current piezoelectric energy collectors, including restricted acquisition direction, limited acquisition bandwidth, and low energy output. Firstly, the dynamic theoretical model of the energy harvester was established, and the optimization factors were explored, providing a solid theoretical foundation for subsequent research endeavors. The energy capture characteristics of rectangular beam and compound trapezoidal beam were compared through finite element simulation analysis. Subsequently, an experimental platform was constructed and an optimized experimental methodology was devised to analyze the energy capture characteristics and enhance the performance of the energy harvester. The results demonstrate that the positive feedback magnetic-coupled piezoelectric energy harvester with a trapezoidal beam exhibits superior energy capture efficiency. Furthermore, it is observed that the optimized energy harvester possesses wide frequency coverage, multi-directional capabilities, low-frequency adaptability, and facilitates easy vibration. When the 45kΩ resistor is connected in series and subjected to a longitudinal external excitation amplitude of 0.5g, it is capable of generating an average voltage and power output of 4.20V and 0.39mW respectively at a vibration frequency of 9Hz. Similarly, when exposed to a transverse external excitation amplitude of 1g, it can produce an average voltage output of 6.2V and power output of 0.85mW at a vibration frequency of 19Hz. When the inclination angle of the energy harvester is set to 35 degrees, the maximum voltage output occurs at a frequency of 18Hz and the Z-axis to X-axis force ratio of the energy harvester is 1.428. These research findings can serve as valuable references for piezoelectric energy harvesting applications in self-powered microelectronic systems.

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“…Because of their wide application, unsustainable power supplies became a vital obstacle for the development of WSNs owing to costly replacement and environmental pollution of batteries (Jiang et al, 2020; Liao et al, 2022a; Zheng et al, 2021). Harvesting the surrounding available energy sources including vibration, rotation, airflow, ocean waves, machinery equipment, transportation infrastructure, and human motion is regarded as one of the promising alternatives to replace electrochemical batteries (Li et al, 2022; Liao et al, 2022b; Wu et al, 2018; Xia et al, 2022). To transform various forms of ambient energies into useful electric energy, a vital effort has been devoted to energy harvesting by exploiting the piezoelectric, electromagnetic, electrostatic, and triboelectric mechanisms (Chou et al, 2011; Harb, 2011; Zahid Kausar et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Development and performance evaluation of a wheel-type cantilevered piezoelectric rotational energy harvester via an unfixed exciting magnet

Kan

Zhang

Wang

et al. 2023

Journal of Intelligent Material Systems and Structures

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A wheel-type cantilevered piezoelectric rotational energy harvester (wheel-type PREH) via an unfixed exciting magnet was presented to harvest energy from rotational motion without or far away from a fixed support. To verify the structural feasibility and figure out the effect of rolling exciting magnet and excited magnet on the dynamic characteristics and power generation performance of the wheel-type PREH, the theoretical analysis, simulation, fabrication and experimental testing were performed. The results showed that the performance of the wheel-type PREH depended on the rotary speeds, proof mass and piezo-cantilever mass, number of exciting magnets, cylindrical sleeve materials and so on. When other parameters were constant, there were multiple optimal rotary speeds for the maximal amplitude-ratio, output voltage, electrical energy and output power to achieve peak. Besides, the total number of voltage crests per second did not change with rotary speed. There was a constant optimal resistance load for the wheel-type PREH at different rotary speeds to achieve maximal power. The PREH prototype could yield a maximum output power of 0.74 mW at 767 r/min with optimal load resistance of 215 kΩ and 40 different color LEDs in parallel and a low power light strip could be lighted by wheel-type PREH.

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An eccentric rotational energy harvester using liquid as an energy-capturing medium

Cited by 10 publications

References 50 publications

A piezoelectric energy harvester with parallel connection using beams of different lengths to improve output performance

A piezoelectric energy harvester with parallel connection using beams of different lengths to improve output performance

Design and experimental investigation of a positive feedback magnetic-coupled piezoelectric energy harvester

Development and performance evaluation of a wheel-type cantilevered piezoelectric rotational energy harvester via an unfixed exciting magnet

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