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• W4200014701 endingPage "025007" @default.
• W4200014701 startingPage "025007" @default.
• W4200014701 abstract "Abstract Though numerous piezoelectric vibration energy harvesters (PVEHs) have been designed and investigated to provide power supply for wireless sensors or wearable devices, it remains a challenge for traditional PVEHs to work effectively in an environment of low frequency, low acceleration and multidirectional vibrations. This work presents a PVEH using a low-frequency energy-capturing resonant system formed by a rolling ball in a hemispherical shell and driven by a rope. Due to the symmetry of the sphere, the ball can be excited at multiple directions in 3D space, and the piezoelectric beam can be pulled by the ball through a rope in multiple directions. Thus, the efficient multidirectional energy harvesting under low frequency (<10 Hz) and ultralow intensity (<0.1 g ) vibrations could be realized. A mass-spring-damper equivalent model was built to understand the operation mechanism of the proposed PVEH. The results show that the proposed PVEH has a potential to collect energy in any direction in 3D space, and could achieve a good angle bandwidth with 360° for ϕ and 240° for β under the excitation of a = 0.04 g, f = 6.8 Hz with the acceleration <?CDATA ${boldsymbol{{vec a}}}left( {a,beta ,varphi } right)$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mrow> <mml:mover> <mml:mi mathvariant=bold-italic>a</mml:mi> <mml:mo mathvariant=bold>⃗</mml:mo> </mml:mover> </mml:mrow> </mml:mrow> <mml:mfenced close=) open=(> <mml:mrow> <mml:mi>a</mml:mi> <mml:mo>,</mml:mo> <mml:mi>β</mml:mi> <mml:mo>,</mml:mo> <mml:mi>φ</mml:mi> </mml:mrow> </mml:mfenced> </mml:math> defined in the spherical coordinate system. The developed PVEH can generate 6.5 μ W under a low-intensity excitation (0.03 g ), and the normalized power density can reach 22.63 μ W/(cm 3 g 2 Hz). Moreover, the minimum start-up acceleration analysis of the proposed PVEH indicates that the PVEH can capture multidirectional energy from vibrations as low as 0.01 g . In addition, both simulation and experimental study on rope redundancy and ball mass show that they can be used to adjust the device performance easily without structure re-fabrication. Overall, this study demonstrates a new mechanism that could effectively harvest low frequency, ultralow intensity and multidirectional vibration energy." @default.
• W4200014701 created "2021-12-31" @default.
• W4200014701 creator A5041383884 @default.
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• W4200014701 date "2021-12-20" @default.
• W4200014701 modified "2023-10-01" @default.
• W4200014701 title "A 3D multidirectional piezoelectric energy harvester using rope-driven mechanism for low frequency and ultralow intensity vibration environment" @default.
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• W4200014701 doi "https://doi.org/10.1088/1361-665x/ac3f77" @default.
• W4200014701 hasPublicationYear "2021" @default.
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