PDF
Full
Outline
Ambient environments are rich in rotational energy resources. These can be converted into useful electric energy through energy conversion materials to，powering embedded devices and wireless sensors in the Internet of Things. As such，energy harvesting technology could potentially address the environmental pollution and high maintenance costs associated with traditional chemical batteries. This paper proposes a novel time-varying potential well magnetic-coupled bistable energy harvesting system with low potential barriers to enhance the energy harvesting performance in ultra-low frequency rotating environments （below 3 Hz）. The proposed system comprises a forward steel beam and an inverted piezoelectric beam installed on a rotational plate. Mutually exclusive magnets are attached to the free ends of both beams，creating three equilibrium positions due to the magnetic force，two of which are stable. This gives the system its coupled bistable characteristics. The free end of the forward steel beam is distanced from the center of the rotational plate，making it a centrifugal hardening beam. Conversely，the free end of the inverted piezoelectric beam is closer to the center，making it a centrifugal softening beam. Taking into account the influence of the centrifugal effect，the distributed parameter electromechanical coupling equation of the system is derived in the rotational coordinate system using the energy method，Lagrange equation，piezoelectric theory，and more. A magnetic calculation model is used to analyze the influence of magnetic spacing and the centrifugal effect on the potential energy well and the energy harvesting performance of the system. Finally，numerical simulations and experimental results verify that，compared to the linear energy harvesting system，the proposed magnetic-coupled bistable energy harvesting system has a wider operating frequency range （0~2.67 Hz） and higher output voltage （greater than 2 V）.
PDF
62
31
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
