Abstract Ultralow-frequency kinetic energy mainly in the form of vibrations is omnipresent in the environment, but its effective exploitation remains a challenge. To tackle this problem, this paper presents a rope-spun rotor structure to transform ultralow-frequency vibrations/linear motions to rapid rotations through a piece of rope. The superior performance of the rotor is demonstrated by applying it to electromagnetic energy harvesting from ultralow-frequency vibrations and irregular human body motions. When the rope-spun rotor based harvester is periodically pushed down 10.5 mm at 1.5 Hz, it produces 9.7 mW electric power. When embedded in a shoe insole, the harvester delivers 8 mW power to a matched load as a male participant walks with the shoe at 6.5 km/h. When positioned under a piece of floorboard, the harvester can charge a supercapacitor (220 mF) from 0 to 3.5 V within 8 min. The harvester can also sustain the continuous operation of multiple electronics simultaneously by scavenging energy from gentle finger tapping motions. This study demonstrates a new mechanism for realizing vibration-to-rotation conversion and a promising way for efficient harvesting of ultralow-frequency energy.

中文翻译：

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通过绳索转子的振动-旋转转换来利用超低频能量

摘要 以振动形式为主的超低频动能在环境中无处不在，但其有效利用仍是一个挑战。为了解决这个问题，本文提出了一种绳索转子结构，通过一根绳子将超低频振动/线性运动转换为快速旋转。通过将其应用于从超低频振动和不规则人体运动中收集电磁能量，证明了转子的卓越性能。当基于绳索转子的收割机以 1.5 Hz 的频率周期性地向下推 10.5 毫米时，它会产生 9.7 毫瓦的电力。当嵌入鞋垫中时，当男性参与者穿着鞋以 6.5 公里/小时的速度行走时，收割机为匹配的负载提供 8 毫瓦的功率。当放置在一块地板下时，收割机可以在 8 分钟内为超级电容器 (220 mF) 充电 0 至 3.5 V。收割机还可以通过从轻柔的手指敲击运动中收集能量来维持多个电子设备的同时连续运行。这项研究展示了一种实现振动到旋转转换的新机制和一种有效收集超低频能量的有前途的方法。