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Title: A nonlinear interface integrated lever mechanism for piezoelectric footstep energy harvesting

Abstract

Harnessing footstep energy allows for a unique method of power generation from a largely untapped resource, with applications such as instantly charging mobile and wearable electronic devices. This letter presents an easily integrated heel charger to efficiently convert kinematic walking energy into electricity. The heel charger uses a multilayered levered piezoelectric (L-Pie) mechanism associated with a nonlinear mechanical-synchronized switching on inductor circuit (M-SSHI) interface. It tactfully switches on when the foot contacts the ground, and switches off when the foot is lifted. This design takes full advantage of the user's weight, and amplifies footstep displacement by utilizing the lever mechanism to gain maximum deformation of multilayer piezoelectric patches. The experimental results show that the fabricated two-level multilayer L-pie has a top performance of 13.60 mW of AC RMS, a mechanical to AC power conversion efficiency of 7.87%, and a DC RMS power of 6.13 mW, an AC to DC power conversion efficiency of 45.07%, under a harmonic excitation of 2.3 Hz (mimicking fast walking speed: 6.2 km/h for men, 5.55 km/h for women). With an optimal load of 210 kΩ, the two-level L-pie using the M-SSHI has an improvement of 206.45% in DC RMS power compared to a standard 4-diodemore » bridge energy harvesting circuit. Finally, the L-pie design works more efficiently under large force excitation, even with small displacement, which makes this technology optimal for footstep energy harvesting.« less

Authors:
 [1];  [2];  [2]; ORCiD logo [1];  [3]
  1. Texas A&M Univ., College State, TX (United States). Dept. of Mechanical Engineering
  2. Stony Brook Univ., NY (United States). Dept. of Mechanical Engineering
  3. Duke Univ., Durham, NC (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
State Univ. of New York (SUNY), Albany, NY (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1540236
Alternate Identifier(s):
OSTI ID: 1462790
Grant/Contract Number:  
AR0000531
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 5; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; physics

Citation Formats

Hua, Rui, Liu, Haili, Yang, Haocheng, Wang, Ya, and Ferrante, Jack. A nonlinear interface integrated lever mechanism for piezoelectric footstep energy harvesting. United States: N. p., 2018. Web. doi:10.1063/1.5041259.
Hua, Rui, Liu, Haili, Yang, Haocheng, Wang, Ya, & Ferrante, Jack. A nonlinear interface integrated lever mechanism for piezoelectric footstep energy harvesting. United States. doi:10.1063/1.5041259.
Hua, Rui, Liu, Haili, Yang, Haocheng, Wang, Ya, and Ferrante, Jack. Fri . "A nonlinear interface integrated lever mechanism for piezoelectric footstep energy harvesting". United States. doi:10.1063/1.5041259. https://www.osti.gov/servlets/purl/1540236.
@article{osti_1540236,
title = {A nonlinear interface integrated lever mechanism for piezoelectric footstep energy harvesting},
author = {Hua, Rui and Liu, Haili and Yang, Haocheng and Wang, Ya and Ferrante, Jack},
abstractNote = {Harnessing footstep energy allows for a unique method of power generation from a largely untapped resource, with applications such as instantly charging mobile and wearable electronic devices. This letter presents an easily integrated heel charger to efficiently convert kinematic walking energy into electricity. The heel charger uses a multilayered levered piezoelectric (L-Pie) mechanism associated with a nonlinear mechanical-synchronized switching on inductor circuit (M-SSHI) interface. It tactfully switches on when the foot contacts the ground, and switches off when the foot is lifted. This design takes full advantage of the user's weight, and amplifies footstep displacement by utilizing the lever mechanism to gain maximum deformation of multilayer piezoelectric patches. The experimental results show that the fabricated two-level multilayer L-pie has a top performance of 13.60 mW of AC RMS, a mechanical to AC power conversion efficiency of 7.87%, and a DC RMS power of 6.13 mW, an AC to DC power conversion efficiency of 45.07%, under a harmonic excitation of 2.3 Hz (mimicking fast walking speed: 6.2 km/h for men, 5.55 km/h for women). With an optimal load of 210 kΩ, the two-level L-pie using the M-SSHI has an improvement of 206.45% in DC RMS power compared to a standard 4-diode bridge energy harvesting circuit. Finally, the L-pie design works more efficiently under large force excitation, even with small displacement, which makes this technology optimal for footstep energy harvesting.},
doi = {10.1063/1.5041259},
journal = {Applied Physics Letters},
number = 5,
volume = 113,
place = {United States},
year = {2018},
month = {8}
}

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