Shape optimization of a non-uniform piezoelectric bending beam for human knee energy harvester

Liao, Haisu1,2; Wu, Tsunho2; Gao, Gang1,2; Wu, Xinyu2; Gao, Fei2

2024-10-01

10.1088/1361-665X/ad78ce

SMART MATERIALS AND STRUCTURES   影响因子和分区

0964-1726

1361-665X

Scavenging energy from the human body to provide a sustainable source for electronic devices has gained significant attention. Recently, scientists have focused on harnessing biomechanical energy from human motion. This study was dedicated to developing and optimizing a non-uniform piezoelectric bending beam-based human knee energy harvester. The bimorph non-uniform piezoelectric bending beam consisted of a non-uniform carbon fiber substrate and piezoelectric macro fiber composites. Compared to the uniform piezoelectric bending beam, the non-uniform piezoelectric beam can optimize the shape to improve the average strain, thus improving the energy harvesting efficiency. In this study, eight shape functions, including ellipse, sin, tanh, exponential function, parabola, trigonometric line, and bell curves, were investigated and optimized. The bell curve bending beam was selected and fabricated due to its good performance. Then, a benchmark platform was developed to test the deflection curve and reaction force when the nonuniform bending beam was compressed. Finally, to validate the design, experimental testing on three subjects was conducted when they were equipped with the harvester and walked on a treadmill. Testing results indicated that the non-uniform bending beam-based energy harvester can improve the energy harvesting efficiency by 28.57% compared to the uniform beam-based energy harvester. The output power can reach 18.94 mW when walking at 7.0 km h-1.

energy harvester piezoelectric bending beam shape optimization human knee human motion human gait

SCI

英语

第一

Guangdong Basic and Applied Basic Research Foundation[2022A1515011467] ; Shenzhen-Hong Kong-Macao Science and Technology Project (Category C)[SGDX20220530111005036] ; Key R&D Project of Hainan Province[ZDYF2022SHFZ302] ; Shenzhen basic research key project[JCYJ20220818101407016] ; null[62203427]

Instruments & Instrumentation ; Materials Science

Instruments & Instrumentation ; Materials Science, Multidisciplinary

WOS:001314692700001

IOP Publishing Ltd

Web of Science

1.Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China
2.Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China

Liao, Haisu,Wu, Tsunho,Gao, Gang,et al. Shape optimization of a non-uniform piezoelectric bending beam for human knee energy harvester[J]. SMART MATERIALS AND STRUCTURES,2024,33(10).

Liao, Haisu,Wu, Tsunho,Gao, Gang,Wu, Xinyu,&Gao, Fei.(2024).Shape optimization of a non-uniform piezoelectric bending beam for human knee energy harvester.SMART MATERIALS AND STRUCTURES,33(10).

Liao, Haisu,et al."Shape optimization of a non-uniform piezoelectric bending beam for human knee energy harvester".SMART MATERIALS AND STRUCTURES 33.10(2024).