scholarly journals Modeling and analysis of Galfenol cantilever vibration energy harvester with nonlinear magnetic force

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056718 ◽  
Author(s):  
Shuying Cao ◽  
Shuaishuai Sun ◽  
Jiaju Zheng ◽  
Bowen Wang ◽  
Lili Wan ◽  
...  
Keyword(s):  
Magnetic Force ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Modeling And Analysis

Analysis of the component forces of the nonlinear magnetic force in energy harvester

2020 ◽  
pp. 095440892094938
Author(s):  
Bing Chen ◽  
Xiaolei Tang
Keyword(s):  
Cantilever Beam ◽  
Magnetic Force ◽  
Permanent Magnets ◽  
Energy Harvester ◽  
Vertical Component ◽  
Energy Utilization ◽  
Vibration Energy ◽  
Utilization Rate ◽  
Vibration Energy Harvester ◽  
Force Calculation

In the piezoelectric vibration energy harvester, permanent magnets are often used to generate nonlinear applied magnetics force to improve the energy utilization rate of the system, the modeling analysis and accurate calculation of the force between magnets in the system is a difficult problem in the study of nonlinear bistable vibration energy harvesting. During the deformation of the cantilever beam, the direct force of the permanent magnet block can be divided into horizontal and vertical component forces. In most existing literatures analyzing such problems, the magnetizing current method magnetic force calculation model of double-stabilized electric beam mainly considers the influence of vertical magnetic force on the system of cantilever beam, and it is considered that the horizontal component of magnetic force has little influence on the vibration response of cantilever beam, but there is no detailed proof and elaboration of this problem. In this paper, the magnetic force, the effect of magnetic force on natural frequency and magnetic potential energy are calculated and simulated from three aspects. Through the comparison of results, it is proved that the effect of the horizontal magnetic force on the whole nonlinear piezoelectric beam vibration energy harvester can be ignored.

scholarly journals Design of a quasi-periodic vibration energy harvester based on an electromagnetic technique

2018 ◽  
Vol 241 ◽  
pp. 01024
Author(s):  
Zakaria Zergoune ◽  
Najib Kacem ◽  
Noureddine Bouhaddi
Keyword(s):  
Magnetic Force ◽  
Energy Harvester ◽  
Harmonic Balance Method ◽  
Magnetic Coupling ◽  
Vibration Energy ◽  
Energy Localization ◽  
Mechanical Stiffness ◽  
Reference Case ◽  
Vibration Energy Harvester ◽  
Periodic Vibration

In the present paper, a quasi-periodic vibration energy harvester with magnetic coupling is proposed using the benefits of the energy localization. The proposed quasi-periodic system consists of moving magnets held by elastic structures and coupled by a magnetic force. The mistuning of the device can be achieved by changing either the linear mechanical stiffness or the mass. The whole system has been modelled by forced Duffing equations for each degree of freedom, which include the magnetic nonlinearity and the mechanical damping. The governing equations have then been solved using the harmonic balance method coupled with the asymptotic numerical method. The obtained numerical results show that the total harvested power was increased by 11 % with a bandwidth of 2.7 % thanks to the energy localization phenomenon compared to the reference case.

Broadband vibration energy harvester based on nonlinear magnetic force and rotary pendulums

2021 ◽  
Author(s):  
Qiang Yan ◽  
Xianzhi Dai ◽  
Zhang Zhang ◽  
Lijun Wang ◽  
Yong Wang
Keyword(s):  
Magnetic Force ◽  
Permanent Magnets ◽  
Energy Harvester ◽  
Center Frequency ◽  
Vibration Energy ◽  
Strong Nonlinearity ◽  
Peak Voltage ◽  
Vibration Energy Harvester ◽  
Magnetoelectric Transducer ◽  
Half Power

Abstract A broadband vibration energy harvester based on nonlinear magnetic force and rotary pendulums is proposed in this paper. The harvester is mainly composed of a magnetoelectric transducer and a rotary pendulum fixed with four permanent magnets. In order to improve the working bandwidth of the harvester, two pairs of permanent magnets are added in the middle of the rotary pendulum by using magnetic nonlinearity. The mechanical - magnetic - electrical analytical model of the harvester is established, and the theoretical value obtained by the model is basically consistent with the experimental value. The results show that the harvester has a strong nonlinearity through the magnetic force. When the acceleration is 0.4 g, some typical testing results are as follows: the resonant frequency is 19 Hz, maximum peak-peak voltage is 94.1 V, half power bandwidth is 15.8 Hz, center frequency is 26.9 Hz, and the ratio of half power bandwidth to the center frequency is 58.73 %.

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