A two-degree-of-freedom piezoelectric energy harvester with stoppers for achieving enhanced performance

Hu, G, Tang, L, Das, R and Marzocca, P 2018, 'A two-degree-of-freedom piezoelectric energy harvester with stoppers for achieving enhanced performance', International Journal of Mechanical Sciences, vol. 149, pp. 500-507.


Document type: Journal Article
Collection: Journal Articles

Title A two-degree-of-freedom piezoelectric energy harvester with stoppers for achieving enhanced performance
Author(s) Hu, G
Tang, L
Das, R
Marzocca, P
Year 2018
Journal name International Journal of Mechanical Sciences
Volume number 149
Start page 500
End page 507
Total pages 8
Publisher Pergamon Press
Abstract Environmental vibrations often exist in a broadband form. To have a robust performance over a wide frequency range, vibration energy harvesters need to be designed to be insensitive to excitation frequencies. In this paper, we propose a novel two-degree-of-freedom (DOF) piezoelectric energy harvester (PEH) with stoppers that introduce nonlinear dynamic interaction between the two DOFs. First, the mechanical model of the 2DOF system with stoppers is developed by emulating the impact behavior as a piecewise linear stiffness and the working principle is explained. Subsequently, the analytical solution of the system with piecewise linear stiffness is derived using the averaging method and the dynamic response of the system is obtained and confirms its wide bandwidth property. Finally, by integrating the mechanical system with a piezoelectric transducer, the energy harvesting performance of the proposed 2DOF PEH with stoppers is numerically evaluated. The open circuit voltage response of the proposed system is compared with that of the conventional linear 2DOF and 1DOF PEHs. A parametric study reveals the effect of the stopper distance on the energy harvesting performance in terms of both the bandwidth and open circuit voltage output. The superiority of the proposed system in terms of both power output and operation bandwidth is demonstrated.
Subject Aerospace Materials
Aerospace Structures
Keyword(s) Averaging method
Linear and nonlinear systems
Piecewise function
Piezoelectric
Two degrees of freedom
Vibration based energy harvesting
DOI - identifier 10.1016/j.ijmecsci.2017.07.051
Copyright notice © 2017 Elsevier Ltd. All rights reserved.
ISSN 0020-7403
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