Expansion of the degree of freedom of a vibration energy harvester and the optimal adjustment to the ambient vibration

2020 ◽  
Vol 2020 (0) ◽  
pp. 133
Author(s):  
Toshihiko KOMATSUZAKI ◽  
Toshiyuki UENO ◽  
Shota KITA ◽  
Fumiya MAKINO
Keyword(s):  
Energy Harvester ◽  
Degree Of Freedom ◽  
Ambient Vibration ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Optimal Adjustment

3-Degree-of-freedom electromagnetic vibration energy harvester with serially connected leaf hinge joints

2018 ◽  
Vol 30 (2) ◽  
pp. 308-322 ◽  
Author(s):  
Hyun Soo Kim ◽  
Wooseok Ryu ◽  
Shi-baek Park ◽  
Yong Je Choi
Keyword(s):  
Stiffness Matrix ◽  
Energy Harvester ◽  
Design Method ◽  
Normal Modes ◽  
Degree Of Freedom ◽  
Vibration Energy ◽  
Resonant Frequencies ◽  
Vibration Energy Harvester ◽  
Electromagnetic Vibration ◽  
Optimal Load

This article presents a new design method of a planar 3-degree-of-freedom serial manipulator-type electromagnetic vibration energy harvester in which any desired ratio of power peaks and three target resonant frequencies can be specified arbitrarily. The design of the harvester aims to achieve minimum difference between the power peaks generated at target frequencies. The geometrical positions of three normal modes are first determined and the corresponding stiffness matrix of the harvester is found. Second, the stiffness matrix can be synthesized by three serially connected torsional springs. Third, the leaf hinge joints corresponding to torsional springs are designed using the newly developed design equations. Finally, the array and the locations of the magnets are found using the sequential quadratic programming (SQP) algorithm. The experiments are conducted to verify the design method. Three resonant frequencies are measured at 23.4, 29.2, and 34.8 Hz comparing to the target frequencies of 25, 30, and 35 Hz. The peak powers of 1.28, 0.89, and 1.32 mW are obtained across the optimal load resistor of 1.01 kΩ under the condition of the constant acceleration of 1.5 m/s2.

Trends of MEMS-Based Vibration Energy Harvester

2013 ◽  
Vol 562-565 ◽  
pp. 1251-1256
Author(s):  
Bing Mo ◽  
Rong Hai Huang ◽  
Rui Min Huang ◽  
Chao Dong Ling ◽  
Huo Zhou
Keyword(s):  
Wireless Sensor Networks ◽  
Power Management ◽  
Energy Harvester ◽  
Ambient Vibration ◽  
Wireless Sensor ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Prospective Development ◽  
Energy Harvesters ◽  
Micro Vibration

Micro vibration energy harvesters have received much attention due to their potential application of low power wireless sensor networks and embedded systems. This paper studies three mechanisms to scavenge the ambient vibration energy, discusses the power management circuit and the application of the converter, investigates the prospective development and ongoing challenges in MEMS-based vibration energy harvester.

A Self-Sufficient and Frequency Tunable Piezoelectric Vibration Energy Harvester

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Cevat Volkan Karadag ◽  
Nezih Topaloglu
Keyword(s):  
Energy Demand ◽  
Energy Harvester ◽  
Electrical Power ◽  
Control Unit ◽  
Ambient Vibration ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Piezoelectric Cantilever ◽  
Wide Range ◽  
Piezoelectric Vibration

In this paper, a novel smart vibration energy harvester (VEH) is presented. The harvester automatically adjusts its natural frequency to stay in resonance with ambient vibration. The proposed harvester consists of two piezoelectric cantilever beams, a tiny piezomotor with a movable mass attached to one of the beams, a control unit, and electronics. Thanks to its self-locking feature, the piezomotor does not require energy to fix its movable part, resulting in an improvement in overall energy demand. The operation of the system is optimized in order to maximize the energy efficiency. At each predefined interval, the control unit wakes up, calculates the phase difference between two beams, and if necessary, actuates the piezomotor to move its mass in the appropriate direction. It is shown that the proposed tuning algorithm successfully increases the fractional bandwidth of the harvester from 4% to 10%. The system is able to deliver 83.4% of the total harvested power into usable electrical power, while the piezomotor uses only 2.4% of the harvested power. The presented efficient, autotunable, and self-sufficient harvester is built using off-the-shelf components and it can be easily modified for wide range of applications.

scholarly journals Design, Analysis and Finite Element Modeling of Macro Fiber Composite Piezoelectric Materials

2020 ◽  
Vol 2 (2) ◽  
pp. 24
Keyword(s):  
Finite Element ◽  
Energy Harvester ◽  
Piezoelectric Materials ◽  
Fiber Composite ◽  
Electrical Response ◽  
Element Model ◽  
Ambient Vibration ◽  
Vibration Energy ◽  
Response Analysis ◽  
Vibration Energy Harvester

Vibration energy harvester has been paid a lot of attention by many researchers to transforming ambient vibration into electrical energy, which is normally utilized to develop wireless electronic sectors. The paper presents a finite element model (FEM) of a vibration energy harvester consisting of a bimorph electromechanical system (MEMS) generator. The model is used to simulate, and compare, the mechanical characteristics and electrical response of piezoelectric material results between the cantilever beam structure formed by laminating two piezoelectric layers on both sides of a Carbon fiber reinforced polymer (CFRP) substrate and Ti-6Al-4V substrate using ANSYS®19 R1. A set of numerical simulations has been carried out, and the results show that the comparisons of the harmonic response analysis seen change between the different substrates based on the bimorph piezoelectric MEMS generator.

Theoretical modeling and analysis of a 2-degree-of-freedom hybrid piezoelectric–electromagnetic vibration energy harvester with a driven beam

2018 ◽  
Vol 29 (11) ◽  
pp. 2465-2476 ◽  
Author(s):  
Dan Zhao ◽  
Shaogang Liu ◽  
Qingtao Xu ◽  
Wenyi Sun ◽  
Tao Wang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Energy Harvester ◽  
Degree Of Freedom ◽  
Energy Output ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Piezoelectric Energy ◽  
Electromagnetic Vibration ◽  
Operating Bandwidth

In the article, a novel 2-degree-of-freedom hybrid piecewise-linear piezoelectric–electromagnetic vibration energy harvester is presented to achieve better energy harvesting efficiency. The harvester consists of a primary piezoelectric energy harvesting device to which an electromagnetic mechanism is coupled to improve the integral energy output, and a driven beam is mounted to broaden the operating bandwidth by inducing nonlinearity. Considering the piezoelectric–electromagnetic coupling characteristics and the nonlinear factors, dynamic equations of the system are established. Expressions of the output power are deduced though averaging method. Characteristic parameters are analyzed theoretically, including the piezoelectric parameters, electromagnetic parameters, and the piecewise-linearity. Frequency sweep excitation test is conducted on the setup at an excitation acceleration of 0.3 g and results demonstrate that two resonant regions are obtained with the peak output power of 5.4 and 6.49 mW, respectively, and the operating bandwidth is increased by 8 Hz. Moreover, though adjusting the stiffness of the driven beam k3 and the gap between the primary beam and the driven beam d, the performance of the harvester can be further optimized.

A Curled Piezoelectric Cantilever for Two Dimensional Vibration Energy Harvesting

2013 ◽  
Vol 811 ◽  
pp. 469-473
Author(s):  
Xue Feng He ◽  
Yao Qing Cheng ◽  
Jun Gao ◽  
You Zhu
Keyword(s):  
Energy Harvester ◽  
Proof Mass ◽  
Ambient Vibration ◽  
Vibration Energy ◽  
Two Dimensional ◽  
Vibration Energy Harvesting ◽  
Vibration Direction ◽  
Vibration Energy Harvester ◽  
Piezoelectric Cantilever ◽  
Scavenging Efficiency

To harvest ambient vibration energy of different directions, a micromachined vibration energy harvester which can harvest two-dimensional vibration energy was proposed. The harvester is composed of a curled piezoelectric cantilever, a proof mass and the substrate. One end of the cantilever is fixed onto the substrate and the other end is connected with a proof mass. It is the residual stress of micromachining processes that causes the cantilever to curl. A proof-of-concept prototype of the two-dimensional vibration energy harvester was assembled and tested to evaluate the performance. Experimental results show that the vibration direction with the highest energy scavenging efficiency changed with the frequency of the ambient vibration. The vibration energy of any direction in the neutral plane of the curled cantilever can be harvested by using the first two natural vibration modes of the prototype.

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