Abstract
A novel bistable electromagnetic vibration energy harvester (BEMH) is constructed and optimized in this study, based on a nonlinear system consisting mainly of a flexible membrane and a magnetic spring. A large-amplitude transverse vibration equation of the system is established with the general nonlinear geometry and magnetic force. Firstly, the mathematical model, considering the higher-order nonlinearities given by nonlinear Galerkin method, is applied to a membrane with a co-axial magnet mass and magnetic spring. Secondly, the steady vibration response of the membrane subjected to a harmonic base motion is obtained, and then the output power considering electromagnetic effect is analytically derived. On this basis, a parametric study in a broad frequency domain has been achieved for the BEMH with different radius ratios and membrane thicknesses. It is demonstrated that model predictions are both in close agreement with results from the finite element simulation and experiment data. Finally, the proposed efficient solution method is used to obtain an optimizing strategy for the design of multi-stable energy harvesters with the similar flexible structure.
Highlights
With the rapid development of society, the issue of energy shortage and environmental pollution is becoming more and more concerned, which highlights the importance of energy harvesting technologies
The average power generated by the bistable electromagnetic vibration energy harvester (BEMH) in one vibration period is calculated utilizing three models as shown in Figure 12, in which the maximum calculation errors gained by the models of traditional Galerkin method and nonlinear Galerkin method are 31.1% and 5.4% respectively, compared with the results of the finite-element analysis
Are designed and fabricated, whose geometry property listed in Galerkin method is more devices accurateare and available for theofdynamic analysis
Summary
With the rapid development of society, the issue of energy shortage and environmental pollution is becoming more and more concerned, which highlights the importance of energy harvesting technologies. In order to study the nonlinear dynamic characteristics and reliable power optimization criteria for the energy harvester, this paper combines a flexible membrane with a magnetic spring to establish a distributed parameter model for the bistable electromagnetic vibration energy harvester (BEMH). It hasa is adjustable through moving the upper and lower end covers It has adjustable sector rigid magnet, two iron coil windings and a cavity wall. The iron coil windings which are composed of highly conductive enameled wires are fixed to the upper and lower end covers by epoxy resin. The stiffness of the magnetic spring is adjustable through moving the upper and lower end covers It has adjustable sector damping holes which can be used to study the effect of air damping on output power
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