Prompt efficiency of energy harvesting by magnetic coupling of an improved bi-stable system

doi:10.1088/1674-1056/25/11/110503

Abstract In order to improve the transform efficiency of bi-stable energy harvester (BEH), this paper proposes an advanced bi-stable energy harvester (ABEH), which is composed of two bi-stable beams coupling through their magnets. Theoretical analyzes and simulations for the ABEH are carried out. First, the mathematical model is established and its dynamical equations are derived. The formulas of magnetic force in two directions are given. The potential energy barrier of ABEH is reduced and the snap-through is liable to occur between potential wells. To demonstrate the ABEH's advantage in harvesting energy, comparisons between the ABEH and the BEH are carried out for both harmonic and stochastic excitations. Our results reveal that the ABEH's inter-well response can be elicited by a low-frequency excitation and the harvester can attain frequent jumping between potential wells at fairly weak random excitations. Thus, it can generate a higher output power. The present findings prove that the ABEH is preferable in harvesting energy and can be optimally designed such that it attains the best harvesting performance.

Keywords: vibration energy harvesting bi-stability nonlinear dynamics coherence resonance

Received: 25 April 2016
Revised: 18 July 2016
Accepted manuscript online:

PACS:	05.40.-a	(Fluctuation phenomena, random processes, noise, and Brownian motion)
	77.65.-j	(Piezoelectricity and electromechanical effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11172234) and the Scholarship from China Scholarship Council (Grant No. 201506290092).

Corresponding Authors: Wei-Yang Qin
E-mail: qinweiyang67@gmail.com

Cite this article:

Hai-Tao Li(李海涛), Wei-Yang Qin(秦卫阳) Prompt efficiency of energy harvesting by magnetic coupling of an improved bi-stable system 2016 Chin. Phys. B 25 110503

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