Improving Power and Frequency Bandwidth of a Magnetic Spring Based Vibration Energy Harvester Using FR4 Spring-Guided Magnet

2019 ◽  
Author(s):  
Ghufran Aldawood ◽  
Hieu Tri Nguyen ◽  
Hamzeh Bardaweel
Keyword(s):  
Kinetic Energy ◽  
Peak Power ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Frequency Bandwidth ◽  
Vibration Energy Harvester ◽  
Acceleration Level ◽  
Magnetic Spring

Abstract This article introduces an enhanced magnetic spring based energy harvester design suitable for harvesting kinetic energy from vibrations that are characterized by low acceleration levels. The presented design consists of a levitated magnet, an FR4 spring-guided magnet and coils. Prototypes of the enhanced harvester design are fabricated and characterized experimentally. For comparison, a traditional magnetic spring based vibration energy harvester is fabricated and characterized experimentally. Results from experiments confirm the superiority of the proposed enhanced harvester design over the traditional harvester design. At 0.1g [m/s2], the peak power of the enhanced harvester reaches approximately 40 times the peak power generated by the traditional harvester. At this acceleration level both enhanced and traditional harvesters exhibit approximately 0.4 [Hz] frequency bandwidth. At 0.3g [m/s2] the improvement in power generated by the enhanced harvester is approximately 400% compared to the power generated by the traditional harvester while the frequency bandwidth increases by 80%.

scholarly journals Dynamic Modeling and Structural Optimization of a Bistable Electromagnetic Vibration Energy Harvester

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2410 ◽  
Author(s):  
Bei Zhang ◽  
Qichang Zhang ◽  
Wei Wang ◽  
Jianxin Han ◽  
Xiaoli Tang ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
Magnetic Spring ◽  
Element Simulation ◽  
Nonlinear Galerkin Method ◽  
Simulation And Experiment ◽  
The Mathematical Model

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.

scholarly journals A Nonlinear Broadband Electromagnetic Vibration Energy Harvester Based on Double-Clamped Beam

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2710 ◽  
Author(s):  
Zhuang Lu ◽  
Quan Wen ◽  
Xianming He ◽  
Zhiyu Wen
Keyword(s):  
Resonant Frequency ◽  
Analytical Model ◽  
Energy Harvester ◽  
Maximum Output Power ◽  
Average Power ◽  
Vibration Energy ◽  
Maximum Output ◽  
Frequency Bandwidth ◽  
Vibration Energy Harvester ◽  
Electromagnetic Vibration

The performance of vibration energy harvesters is usually restricted by their frequency bandwidth. The double-clamped beam with strong natural nonlinearity is a simple way that can effectively expand the frequency bandwidth of the vibration energy harvester. In this article, a nonlinear electromagnetic vibration energy harvester with monostable double-clamped beam was proposed. A systematic analysis was conducted and a distributed parameter analytical model was established. On this basis, the output performance was estimated by the analytical model. It was found that the nonlinearity of the double-clamped beam had little influence on the maximum output, while broadening the frequency bandwidth. In addition, the resonant frequency, the frequency bandwidth, and the maximum output all increased following the increase of excitation level. Furthermore, the resonant frequency varies with the load changes, due to the electromagnetic damping, so the maximum output power should be gained at its optimum load and frequency. To experimentally verify the established analytical model, an electromagnetic vibration energy harvester demonstrator was built. The prediction by the analytical model was confirmed by the experiment. As a result, the open-circuit voltage, the average power and the frequency bandwidth of the electromagnetic vibration energy harvester can reach up to 3.6 V, 1.78 mW, and 11 Hz, respectively, under only 1 G acceleration, which shows a prospect for the application of the electromagnetic vibration energy harvester based on a double-clamped beam.

Modelling and development of a robust hybrid rotary-translational vibration energy harvester

2016 ◽  
Vol 28 (5) ◽  
pp. 565-577 ◽  
Author(s):  
Owen R Payne ◽  
Scott D Moss
Keyword(s):  
Peak Power ◽  
Energy Harvester ◽  
Average Power ◽  
Mitigation Measures ◽  
Vibration Energy ◽  
Low Loss ◽  
Vibration Energy Harvester ◽  
Peak Output Power ◽  
Translational Vibration ◽  
Single Coil

In this article, a new hybrid rotary-translational vibration energy harvester design is investigated. The design employs two coils which increase the peak output power by ~34% compared with a previous single-coil design. Peak power is shown to increase from 167 to 223 mW under a root-mean-square host acceleration of 5.4 Hz and 500 milli- g (where g = 9.81 m/s2). The measured peak power density of the double-coil device is 7 mW/cm3, compared to 5.5 mW/cm3 for the original single-coil variant. The average power increased from 35 to 39.7 mW. Further to this, the device is made more robust through the inclusion of low loss wear resistant elastomer, and the effects of the wear-mitigation measures are examined.

scholarly journals Low-frequency and broadband vibration energy harvester driven by mechanical impact based on layer-separated piezoelectric beam

2019 ◽  
Vol 40 (12) ◽  
pp. 1777-1790 ◽  
Author(s):  
Dongxing Cao ◽  
Wei Xia ◽  
Wenhua Hu
Keyword(s):  
Energy Harvester ◽  
Low Frequency ◽  
Experimental Results ◽  
Operating Frequency ◽  
Vibration Energy ◽  
Theoretical Principle ◽  
Frequency Bandwidth ◽  
Wide Bandwidth ◽  
Vibration Energy Harvester ◽  
Mechanical Impact

AbstractVibration energy harvesting is to transform the ambient mechanical energy to electricity. How to reduce the resonance frequency and improve the conversion efficiency is very important. In this paper, a layer-separated piezoelectric cantilever beam is proposed for the vibration energy harvester (VEH) for low-frequency and wide-bandwidth operation, which can transform the mechanical impact energy to electric energy. First, the electromechanical coupling equation is obtained by the Euler-Bernoulli beam theory. Based on the average method, the approximate analytical solution is derived and the voltage response is obtained. Furthermore, the physical prototype is fabricated, and the vibration experiment is conducted to validate the theoretical principle. The experimental results show that the maximum power of 0.445 □W of the layer-separated VEH is about 3.11 times higher than that of the non-impact harvester when the excitation acceleration is 0.2 g. The operating frequency bandwidth can be widened by increasing the stiffness of the fundamental layer and decreasing the gap distance of the system. But the increasing of operating frequency bandwidth comes at the cost of reducing peak voltage. The theoretical simulation and the experimental results demonstrate good agreement which indicates that the proposed impact-driving VEH device has advantages for low-frequency and wide-bandwidth. The high performance provides great prospect to scavenge the vibration energy in environment.

Test and Validation of a Nonlinear Electromagnetic Energy Harvester

2014 ◽  
Author(s):  
Mohamed Bendame ◽  
Eihab Abdel-Rahman ◽  
Mostafa Soliman
Keyword(s):  
Energy Harvester ◽  
Vibration Energy ◽  
Frequency Bandwidth ◽  
Impact Oscillator ◽  
Vibration Energy Harvester ◽  
Optimal Power ◽  
Optimal Load ◽  
New Type ◽  
Input Acceleration ◽  
Double Impact

We investigate a new type of nonlinear vibration energy harvester that uses a double impact oscillator as its harvesting element. A prototype of the harvester is analyzed numerically and experimentally when aligned vertically. Results show that the new architecture enhanced the output power as well as the frequency bandwidth in comparison with linear harvesters. The new harvester is capable of generating up to 250 mV and has a harvesting bandwidth of about 6 Hz. The optimal load for 0.7 g input acceleration is found to be 5.5 Ω and the corresponding optimal power is determined to be 8 mWatts.

scholarly journals On the Optimization of a Multimodal Electromagnetic Vibration Energy Harvester Using Mode Localization and Nonlinear Dynamics

Actuators ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 25
Author(s):  
Kaouthar Aouali ◽  
Najib Kacem ◽  
Noureddine Bouhaddi ◽  
Mohamed Haddar
Keyword(s):  
Multiobjective Optimization ◽  
Energy Harvester ◽  
Optimization Procedure ◽  
Element Model ◽  
Vibration Energy ◽  
Generic Model ◽  
Manufacturing Cost ◽  
Frequency Bandwidth ◽  
Vibration Energy Harvester ◽  
Mode Localization

In this paper we study a generic model of a nonlinear quasiperiodic vibration energy harvester (VEH) based on electromagnetic transduction. The proposed device consists of multiple moving magnets guided by elastic beams and coupled by repulsive magnetic forces. A system of two degrees-of-freedom (DOFs) with tunable nonlinearity and mode localization is experimentally validated. The validated 2-DOFs harvester is optimized using a multiobjective optimization procedure to improve its harvested power and frequency bandwidth. An efficient criterion using the modal kinetic energy of the finite element model is proposed to quantify the energy localized in the structure perturbed zones. Afterward, this concept has been generalized to a 5-DOFs VEH with two perturbed DOFs oscillators and the optimal performances are derived using a multiobjective optimization. This proposed model enables a significant increase in the harvested power and frequency bandwidth by 101% and 79%, respectively, compared to that of the 2-DOFs device. Moreover, it has been shown that harvesting energy from two perturbed magnets among five provides almost the same amount of harvested energy and enhances the frequency bandwidth by 18% compared to those of the periodic system. Consequently, the harvester can be improved by reducing the transduction circuits number and the manufacturing cost.

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