用于多向振动的可调摆式压电能量收集器

IF 8.6 2区 工程技术 Q1 ENERGY & FUELS
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引用次数: 0

摘要

在过去十年中,利用压电机制从振动中收集能量为无线传感器供电备受关注。本文提出了一种用于多向振动的可调摆式压电能量收集器(TP-PVEH),以增强能量收集器的发电特性、耐用性和环境适应性。传统的悬臂式压电振动能量收集器(PVEH)通常通过在横梁末端增加证明质量或重塑横梁来降低工作频率,与此不同,TP-PVEH 采用摆锤来利用低频振动。此外,与典型的摆锤式 PVEH 不同的是,该设计中的摆锤没有安装在梁端,而是固定在径向球面滑动轴承(RSPB)结构上,从而避免了重力对梁造成的不可逆损坏。TP-PVEH 利用单摆引起的 RSPB 运动平稳地拨动压电横梁,使压电横梁仅受到单向压应力。同时,由于 RSPB 结构能够促进多向旋转,因此 TP-PVEH 能够有效捕获来自不同方向的能量。研究人员通过理论分析、数值分析和实验测试验证了设计方案,并研究了激励参数和结构参数对 TP-PVEH 输出性能的影响。结果表明,激励振幅、激励角度、验证质量和质量距离对 TP-PVEH 的输出特性有显著影响。工作频率、输出电压和功率可通过上述参数进行有效调节。当激励振幅为 3 mm 时,TP-PVEH 的最佳输出功率为 9.81 mW,输出功率密度为 11.37 μW/mm3,工作频率为 12.5 Hz,负载电阻为 200 kΩ。此外,TP-PVEH 还能为电容器充电,这进一步证明了它的实际供电能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A tunable pendulum-like piezoelectric energy harvester for multidirectional vibration

Harvesting energy from vibrations using piezoelectric mechanism has attracted much attention for powering wireless sensors over the past decade. This paper proposes a tunable pendulum-like piezoelectric energy harvester for multidirectional vibration (TP-PVEH) to enhance the power generation characteristic, durability, and environmental adaptability of energy harvester. Unlike traditional cantilevered piezoelectric vibration energy harvesters (PVEHs), which typically lowered working frequencies by adding the weight of proof mass at the end of beam or reshaping beam, TP-PVEH employed a pendulum to harness low-frequency vibrations. Moreover, in contrast to typical pendulum-like PVEHs, the pendulum in this design was not mounted at the end of beam but was attached to a radial spherical plain bearing (RSPB) structure, which avoided the irreversible beam damage caused by gravitational force. TP-PVEH utilized simple-pendulum-induced RSPB motion to smoothly pluck piezoelectric beams, subjecting the piezoelectric beams to unidirectional compressive stress only. Meanwhile, the RSPB structure's capability to facilitate multidirectional rotation enabled TP-PVEH to efficiently capture energy from various directions. Theoretical analysis, numerical analysis and experiment tests were conducted to validate the design and examine how excitation and structural parameters influenced on the output performance of TP-PVEH. The results demonstrated that the excitation amplitude, excitation angle, proof mass, and mass distance brought significant effects on the output characteristic of TP-PVEH. The working frequency, output voltage and power could be efficiently tuned by the abovementioned parameters. With an excitation amplitude of 3 mm, TP-PVEH achieved an optimal output power of 9.81 mW and an output power density of 11.37 μW/mm3, operating with a load resistance of 200 kΩ at a frequency of 12.5 Hz.TP-PVEH could power 100 blue LEDs and a calculator. Additionally, the ability of TP-PVEH to charge capacitors further demonstrated its practical power supply capabilities.

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来源期刊
Sustainable Materials and Technologies
Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment
CiteScore
13.40
自引率
4.20%
发文量
158
审稿时长
45 days
期刊介绍: Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.
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