High output, lightweight and small-scale rotational piezoelectric energy harvester utilizing internal impact effect

IF 9.9 1区 工程技术 Q1 ENERGY & FUELS Energy Conversion and Management Pub Date : 2024-11-02 DOI:10.1016/j.enconman.2024.119180
Shitong Fang , Xiying Wang , Xiao Zhang , Kui Wu , Tao Yan , Xinyuan Chuai , Xingbao Huang , Xin Li , Zhihui Lai , Shuxiang Dong , Wei-Hsin Liao
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Abstract

It is in great need to achieve continuous battery-free wireless sensing and monitoring of an amount of ultra-low-frequency large-scale rotational machines in transportation, civil engineering, manufacturing, and energy industry. Rotational piezoelectric energy harvesters are promising candidates to power sensors for their high energy densities and ease of integration. However, meeting the sufficient and continuous power supply needs of long-distance sensors for the Internet of Things (IoT) while maintaining the small volume and mass of harvesters remains a challenging task. To overcome this challenge, this work firstly implements the internal impact mechanism to a rotational centrifugal softening piezoelectric energy harvester to achieve its high output, lightweight and small-scale characteristics. On one hand, the internal impact effect utilizes the velocity difference between the piezoelectric beam and sliding mass to enlarge the deflection of piezoelectric material and boost the energy output. On the other hand, the centrifugal softening effect reduces the resonant frequency of harvester, leading to the harvester suitably used for the ultra-low-frequency rotation environment. Theoretical and experimental results demonstrate that the proposed harvester can achieve the normalized energy densities of 17.39 μW/(g Hz) and 1800.97 μW/(cm3 Hz) that stand out among the previously reported rotational piezoelectric energy harvesting devices. Additionally, it is proven experimentally that the energy harvester can achieve the self-powered LoRa system under ultra-low-frequency rotations. The proposed harvester demonstrates significant potential for future battery-free sensors in large-scale rotational machinery monitoring.
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利用内部冲击效应的高输出、轻型和小型旋转压电能量收集器
在交通、土木工程、制造和能源工业中,大量超低频大型旋转机械亟需实现连续的免电池无线传感和监测。旋转压电能量收集器具有高能量密度和易于集成的特点,是为传感器供电的理想选择。然而,既要满足物联网(IoT)远距离传感器的充足和持续供电需求,又要保持能量收集器的小体积和大质量,仍然是一项具有挑战性的任务。为了克服这一挑战,本研究首先在旋转离心软化压电能量收集器中实现了内部冲击机制,从而实现了其高输出、轻量化和小型化的特点。一方面,内冲击效应利用压电束与滑动质量之间的速度差来扩大压电材料的挠度,提高能量输出。另一方面,离心软化效应降低了收割机的谐振频率,使收割机适用于超低频率旋转环境。理论和实验结果表明,所提出的能量收集器可以达到 17.39 μW/(g Hz) 和 1800.97 μW/(cm3 Hz) 的归一化能量密度,在之前报道的旋转压电能量收集装置中脱颖而出。此外,实验证明该能量收集器可在超低频旋转下实现自供电 LoRa 系统。所提出的能量收集器为未来大规模旋转机械监测领域的无电池传感器展示了巨大的潜力。
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来源期刊
Energy Conversion and Management
Energy Conversion and Management 工程技术-力学
CiteScore
19.00
自引率
11.50%
发文量
1304
审稿时长
17 days
期刊介绍: The journal Energy Conversion and Management provides a forum for publishing original contributions and comprehensive technical review articles of interdisciplinary and original research on all important energy topics. The topics considered include energy generation, utilization, conversion, storage, transmission, conservation, management and sustainability. These topics typically involve various types of energy such as mechanical, thermal, nuclear, chemical, electromagnetic, magnetic and electric. These energy types cover all known energy resources, including renewable resources (e.g., solar, bio, hydro, wind, geothermal and ocean energy), fossil fuels and nuclear resources.
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