A Compressive-Mode Wideband Vibration Energy Harvester Using a Combination of Bistable and Flextensional Mechanisms

2016 ◽  
Vol 83 (12) ◽  
Author(s):  
Hong-Xiang Zou ◽  
Wen-Ming Zhang ◽  
Ke-Xiang Wei ◽  
Wen-Bo Li ◽  
Zhi-Ke Peng ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Energy Harvester ◽  
Magnetic Pressure ◽  
Experimental Results ◽  
Piezoelectric Constant ◽  
Vibration Energy ◽  
Resistive Load ◽  
Vibration Energy Harvester ◽  
Compressive Mode

In this paper, a compressive-mode wideband vibration energy harvester using a combination of bistable and flextensional mechanisms is proposed. The structure consists of a cantilever with a magnet fixed at its free end, and a flextensional actuator with a magnet fixed at its free end. A theoretical model is developed to characterize the compressive-mode wideband vibration energy harvester. Both simulations and experiments are carried out to validate the design and analysis of the compressive-mode wideband vibration energy harvester. The results show that the device can work in broadband, and the piezoelectric constant d31 can be enlarged 134 times. The experimental results also indicate that the harvester can generate the power about 31 μW with the resistive load 390 kΩ, while the magnetic pressure is 2.9 N. A developed design including two flextensional actuators symmetrically arranged is also presented. The experimental results show that the two flextensional actuators in the developed design can harvest more energy than one flextensional actuator in the primal design.

Design and Analysis of a Piezoelectric Vibration Energy Harvester Using Rolling Mechanism

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Hong-Xiang Zou ◽  
Wen-Ming Zhang ◽  
Ke-Xiang Wei ◽  
Wen-Bo Li ◽  
Zhi-Ke Peng ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Rolling Force ◽  
Experimental Results ◽  
Design Parameters ◽  
Vibration Energy ◽  
Resistive Load ◽  
Vibration Energy Harvester ◽  
Rolling Mechanism ◽  
Piezoelectric Vibration Energy Harvester ◽  
Piezoelectric Vibration

In this paper, a novel piezoelectric vibration energy harvester using rolling mechanism is presented, with the advantage of harvesting more vibration energy and reducing the impact forces caused by the oscillation. The design utilizes an array arrangement of balls rolling the piezoelectric units, and a piezoelectric unit consists of a piezoceramic (PZT) layer and two raised metal layers bonded to both sides of the PZT layer. The rolling mechanism converts the irregular reciprocating vibration into the regular unidirectional rolling motion, which can generate high and relatively stable rolling force applied to the piezoelectric units. A theoretical model is developed to characterize the rolling mechanism of a ball rolling on a piezoelectric unit. And based on the model, the effects of structural design parameters on the performances of the vibration energy harvester are analyzed. The experimental results show that the rolling-based vibration energy harvester under random vibration can generate stable amplitude direct current (DC) voltage, which can be stored more conveniently than the alternating current (AC) voltage. The experimental results also demonstrate that the vibration energy harvester can generate the power about 1.5 μW at resistive load 3.3 MΩ while the maximal rolling force is about 6.5 N. Due to the function of mechanical motion rectification and compact structure, the rolling mechanism can be suitable for integrating into a variety of devices, harvesting energy from uncertain vibration source and supplying electric energy to some devices requiring specific voltage value.

Optimal Coil Transducer Geometry for an Electromagnetic Nonlinear Vibration Energy Harvester

2013 ◽  
Vol 558 ◽  
pp. 477-488
Author(s):  
Luke A. Vandewater ◽  
Scott D. Moss ◽  
Steve C. Galea
Keyword(s):  
Numerical Model ◽  
Energy Harvester ◽  
Ball Bearing ◽  
Outer Radius ◽  
Vibration Energy ◽  
Resistive Load ◽  
Element Analysis ◽  
Vibration Energy Harvester ◽  
Numeric Model ◽  
Wire Coil

This paper investigates the optimisation of wire-coil transducers for a recently described strongly nonlinear electromagnetic (EM) vibration energy harvester, by coupling previously derived dynamics of the mechanical system with finite element analysis (FEA) to determine the harvesters EM response. The harvester is implemented in a permanent-magnet/ball-bearing arrangement, where vibrations in a host structure induce oscillations of the ball-bearing. The movement of the bearing changes the magnetic flux in a circular pancake wire-coil, inducing an electromotive force (EMF) in the coil and hence a voltage in the harvester circuit. A quintic-modified Duffing equation is applied to predict frequency-displacement relations for the nonlinear dynamics of the harvester. Faradays Law of Induction is implemented with quasi-static FEA modelling of the magnetic field and linked to the dynamics of the system to develop a numeric model for voltage predictions. The issue of back-EMF and damping is also investigated. A fully integrated mechanical-electromagnetic model is shown to compare well to the quasi-static numerical model. The output characteristics of the prototype harvester are then compared with the numerical model. An optimal coil height of 2 mm is predicted, and demonstrated experimentally to produce 20.3 mW from a 12 Hz, 500 milli-g host vibration. Further investigation of coil inner radius and outer radius yields a predicted resistive load power transfer increase of 18% with the optimal coil geometry.

Field Test and Characteristic Analysis of Railroad Track Vibration Energy Harvester

2019 ◽  
Author(s):  
Jianyong Zuo ◽  
Jie Yu ◽  
Cheng Liu ◽  
Yihao Gu ◽  
Lei Zuo ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Railway Track ◽  
Vibration Energy ◽  
Resistive Load ◽  
Characteristic Analysis ◽  
Peak Voltage ◽  
Vibration Energy Harvester ◽  
Energy Harvesting System

Abstract Railroad vibration energy harvester has been researched and developed to harness the energy from the vibration of railway track when the trains pass. The vibrational energy could be transformed into electrical energy using mechanical motion rectification (MMR) mechanism and then further be used to power trackside equipment including sensors and some smart electrical devices. In order to test the performance of the MMR railroad energy harvesting system, a series of infield tests were conducted with a self-developed distributed measurement system in Railroad Test Lab at Tongji University. A 10V peak voltage was achieved with 8 Ohms external resistive load at the train speed of 30 km/h, which was consistent with the result of in-lab bench tests. In addition, some experience of design and installation for the motioned based energy harvesting system was gained, which can provide some references for the future improvement of railroad energy harvesting systems.

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.

A broadband compressive-mode vibration energy harvester enhanced by magnetic force intervention approach

2017 ◽  
Vol 110 (16) ◽  
pp. 163904 ◽  
Author(s):  
Hong-Xiang Zou ◽  
Wen-Ming Zhang ◽  
Wen-Bo Li ◽  
Kai-Ming Hu ◽  
Ke-Xiang Wei ◽  
...  
Keyword(s):  
Magnetic Force ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Intervention Approach ◽  
Mode Vibration ◽  
Compressive Mode

Simply supported FPEDs connected by springs for broadband energy harvesting

2020 ◽  
Vol 64 (1-4) ◽  
pp. 201-210
Author(s):  
Yoshikazu Tanaka ◽  
Satoru Odake ◽  
Jun Miyake ◽  
Hidemi Mutsuda ◽  
Atanas A. Popov ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Evaluation Method ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Functional Materials ◽  
Vibration Energy ◽  
Theoretical Evaluation ◽  
Vibration Energy Harvester ◽  
Polyvinylidene Difluoride ◽  
Simply Supported

Energy harvesting methods that use functional materials have attracted interest because they can take advantage of an abundant but underutilized energy source. Most vibration energy harvester designs operate most effectively around their resonant frequency. However, in practice, the frequency band for ambient vibrational energy is typically broad. The development of technologies for broadband energy harvesting is therefore desirable. The authors previously proposed an energy harvester, called a flexible piezoelectric device (FPED), that consists of a piezoelectric film (polyvinylidene difluoride) and a soft material, such as silicon rubber or polyethylene terephthalate. The authors also proposed a system based on FPEDs for broadband energy harvesting. The system consisted of cantilevered FPEDs, with each FPED connected via a spring. Simply supported FPEDs also have potential for broadband energy harvesting, and here, a theoretical evaluation method is proposed for such a system. Experiments are conducted to validate the derived model.

Hybrid Vibration Energy Harvester based on Stochastic Resonance

2018 ◽  
Vol 138 (5) ◽  
pp. 185-190
Author(s):  
Meng Su ◽  
Dai Kobayashi ◽  
Nobuyuki Takama ◽  
Beomjoon Kim
Keyword(s):  
Stochastic Resonance ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester
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