Abstract
Distributed energy sources, for example the ambient broadband vibrations, are of great importance for the development of the Internet of Things. However, for multistable vibrational energy harvesters, increasing the number of stable equilibrium states to broaden working frequency bands is very difficult. Here we present a poly-stable vibrational energy harvesting approach capable of achieving an exponentially growing maximum number of stable equilibrium states. Unlike the traditional multistable harvesters relying on an external static magnetic field, the nonlinear dynamical behaviours achieved by the proposed approach are synergetic poly-stable motions without the need of external magnets. Comparison experiments in contrast with a linear harvester demonstrate the working bandwidth widened by a factor of 41.0, the power density increased to 760% and the electricity generation raised to 178%. This demonstration of new multistable energy harvester expands the approach to achieving multistable motion and provides a new design philosophy for nonlinear vibrational energy harvesters.
Highlights
Distributed energy sources, for example the ambient broadband vibrations, are of great importance for the development of the Internet of Things
In order to research the poly-stable energy harvesting mechanism and realizing conditions of the synergetic poly-stable motion, the potential energy of the SPBA is analyzed to reveal the relationship between displacements of the beams and stable equilibrium states of the SPBA
The proposed poly-stable vibrational energy harvesting method represents a novel approach to increasing the number of stable equilibrium states
Summary
Distributed energy sources, for example the ambient broadband vibrations, are of great importance for the development of the Internet of Things. A quad-stable energy harvester utilizing magnetic repulsion by three external magnets, with lower potential barriers than those of the corresponding bistable device, exhibits a wider working bandwidth because of the lower excitation energy required to escape from the potential wells[43]. Despite all of these efforts, with existing multistable energy harvesters in which external magnets are used to provide magnetic forces, it is very difficult to achieve five or more stable equilibrium states because of limitations imposed by their mechanism of motion[44]. Z2/m z1/m linear beam array verify the condition of realizing poly-stable motion and its broadband characteristics
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