Beam-Based Vibration Energy Harvesters Tunable Through Folding

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Anup Pydah ◽  
R. C. Batra
Keyword(s):  
Natural Frequencies ◽  
Excitation Frequency ◽  
Beam Theory ◽  
High Sensitivity ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Tuning Parameters ◽  
Energy Harvesters ◽  
Single Fold ◽  
Euler Bernoulli Beam

We present a novel beam-based vibration energy harvester, and use a structural tailoring concept to tune its natural frequencies. Using a solution of the Euler–Bernoulli beam theory equations, verified with finite element (FE) solutions of shell theory equations, we show that introducing folds or creases along the span of a slender beam, varying the fold angle at a crease, and changing the crease location helps tune the beam natural frequencies to match an external excitation frequency and maximize the energy harvested. For a beam clamped at both ends, the first frequency can be increased by 175% with a single fold. With two folds, selective frequencies can be tuned, leaving others unchanged. The number of folds, their locations, and the fold angles act as tuning parameters that provide high sensitivity and controllability of the frequency response of the harvester. The analytical model can be used to quickly optimize designs with multiple folds for anticipated external frequencies.

Analysis and Characterization of Piezoelectric Energy Harvesting From Galloping and Base Excitations With Complex Electrical Circuitry

2016 ◽  
Author(s):  
Hichem Abdelmoula ◽  
Abdessattar Abdelkefi
Keyword(s):  
Excitation Frequency ◽  
Beam Theory ◽  
Load Resistance ◽  
Electrical Circuit ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
And Performance ◽  
Electrical Components ◽  
Euler Bernoulli Beam ◽  
Quenching Phenomenon

The characteristics and performance of piezoelectric energy harvesters concurrently subjected to galloping and base excitations when using a complex electrical circuit are studied. The considered energy harvester is composed of a bilayered cantilever beam with a square cylindrical structure at its tip. Euler-Bernoulli beam theory, nonlinear quasi-steady hypothesis, and Galerkin method are used to develop a reduced order model of this system. The electrical circuitry of the harvester consists of a load resistance, a capacitance, and an inductance. The impacts of the electrical components of the harvester’s circuitry, the wind speed, and the base excitation frequency and acceleration on the broadband characteristics of the harvester, quenching phenomenon, and appearance of new nonlinear behaviors are deeply investigated and discussed. When both coupled frequencies of electrical and mechanical types exists and are far from each other, it is shown that the quenching phenomenon is only related to the coupled frequency of mechanical type. Unlike the existence of the quenching phenomenon, the results show that the beating phenomenon takes place for different excitation frequencies when they are close to the coupled frequencies of electrical and mechanical types.

A Control Approach for Broadening the Operating Frequency Range of a Bridge Vibration Energy Harvester

2011 ◽  
Author(s):  
Alexander V. Pedchenko ◽  
Jonathan W. Hoke ◽  
Eric J. Barth
Keyword(s):  
Condition Monitoring ◽  
Excitation Frequency ◽  
Power Source ◽  
Structural Vibration ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Vibration Energy Harvester ◽  
Control Approach ◽  
Energy Harvesters ◽  
Electromagnetic Vibration

Remote bridge condition monitoring can be accomplished using sensors equipped with transmitters. This allows for timely detection of structural degradation and thereby increases safety. These sensors require a more permanent power source than batteries to enable operation without costly periodic maintenance. Since bridges exhibit structural vibration, electromagnetic vibration energy harvesting is a viable power source candidate. Unfortunately conventional electromagnetic vibration energy harvesters (VEHs) operate efficiently only at their natural frequency. Since a single bridge will vibrate differently, depending on its traffic conditions, the following work proposes a method for augmenting the excitation frequency bandwidth for electromagnetic VEHs, thereby enabling them to be feasible power supplies for bridge condition monitoring. Specifically, the paper provides experimental results showing the effectiveness of the proposed method in inducing resonance type behavior in an electromagnetic VEH at excitation frequencies that otherwise produce little to no motion in the harvester.

Analysis of Variable Section Piezoelectric Harvester

2013 ◽  
Vol 734-737 ◽  
pp. 2638-2641
Author(s):  
Yong Zhou ◽  
Shi Li
Keyword(s):  
Beam Theory ◽  
Outer Edge ◽  
Vibration Energy ◽  
Curvature Radius ◽  
Concentrated Load ◽  
Vibration Energy Harvester ◽  
Coupling Vibration ◽  
Energy Harvesters ◽  
The Matrix ◽  
Piezoelectric Vibration

This paper first presents an analytical model for investigating the vibration performance of a thin curved laminated piezoelectric beam with variable curvatures and transverse sections. This kind of beam is widely used for the MEMS piezoelectric vibration energy harvester. The curved thin beam theory with bisymmetric section, here rectangular section used, is employed to explore the bending and twisting coupling vibration characteristics. In order to study the vibration properties with concentrated load, the effects of the tip proof mass isnt used. The paper also shows that the adoption of ANSYS software to carry out the MEMS piezoelectric vibration energy harvesters numerical simulation can improve the efficiency of the harvester designing and manufacturing consumedly. The results showed that the maximum voltage at the resonant point was increasing while the initial curvature radius increasing. On the other hand, the voltage difference of the inner edge and the outer edge was very small because the matrix layer was PDMS with very small stiffness and density.

A Multi-Point Loaded Piezocomposite Beam: Modeling of Vibration Energy Harvesting

2018 ◽  
Author(s):  
Hesam Sharghi ◽  
Onur Bilgen
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Materials ◽  
Beam Theory ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Energy Harvesters ◽  
Mechanical Deformations ◽  
Cantilevered Beam ◽  
Tip Velocity ◽  
Euler Bernoulli Beam

Energy harvesting from ambient vibrations and mechanical deformations using piezoelectric materials has received significant attention over the last decade. These types of energy harvesters find applications in structural health monitoring, wireless sensor networks, etc. In this paper, vibration energy harvesting from piezocomposite beams with unconventional boundary conditions is investigated. The so-called inertial four-point boundary condition is useful in applications where the cantilevered beam setup leads to non-uniform stress-strain distribution along the beam domain. In this paper, the Euler-Bernoulli beam theory is used to model the beam. The voltage output, maximum power output, and the tip velocity are investigated. The efficiency of the four-point loaded beam is compared to a cantilever beam.

Analysis of a Curved Beam MEMS Piezoelectric Vibration Energy Harvester

2010 ◽  
Vol 139-141 ◽  
pp. 1578-1581 ◽  
Author(s):  
Yong Zhou ◽  
Yong Dong ◽  
Shi Li
Keyword(s):  
Energy Harvester ◽  
Dynamic Performance ◽  
Beam Theory ◽  
Vibration Energy ◽  
Curved Beam ◽  
Vibration Energy Harvester ◽  
Coupling Vibration ◽  
Structural Assembly ◽  
Piezoelectric Vibration Energy Harvester ◽  
Piezoelectric Vibration

An analytical model is derived for obtaining the dynamic performance of a thin curved composite piezoelectric beam with variable curvatures for the MEMS piezoelectric vibration energy harvester. The plane curved beam theory with rectangular section is employed to explore the bending and twisting coupling vibration characteristics. In order to satisfy the most available environmental frequencies, which are on the order of 1000Hz, the parameters of the spiraled composite beam bonded with piezoelectric on the surfaces are investigated to provide a method of how to design low resonance beams while keeping the compacting structural assembly. The results indicate the adoption of ANSYS® software to carry out the MEMS piezoelectric vibration energy harvester’s numerical simulation can improve the accuracy of the harvester designing and manufacturing consumedly. And the simulation data also provide a theory analysis foundation for the engineering, design and application of harvester.

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.

On Mathematical Modeling of Piezoelectric Energy Harvesters

2014 ◽  
Vol 953-954 ◽  
pp. 655-658 ◽  
Author(s):  
Guang Qing Shang ◽  
Hong Bing Wang ◽  
Chun Hua Sun
Keyword(s):  
Mathematical Modeling ◽  
Energy Harvesting ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Piezoelectric Energy Harvesting ◽  
Vibration Energy Harvester ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Energy Harvesting System ◽  
Piezoelectric Vibration

Energy harvesting system has become one of important areas of ​​research and develops rapidly. How to improve the performance of the piezoelectric vibration energy harvester is a key issue in engineering applications. There are many literature on piezoelectric energy harvesting. The paper places focus on summarizing these literature of mathematical modeling of piezoelectric energy harvesting, ranging from the linear to nonlinear, from early a single mechanical degree to piezoaeroelastic problems.

Multi-Modal Vibration Energy Harvesting Using a Trapezoidal Plate

2011 ◽  
Author(s):  
Mustafa H. Arafa
Keyword(s):  
System Performance ◽  
Energy Harvester ◽  
Natural Frequencies ◽  
Vibration Energy ◽  
Vibration Modes ◽  
Vibration Energy Harvesting ◽  
Energy Harvesters ◽  
Trapezoidal Plate ◽  
Plate Geometry ◽  
Modal Vibration

Vibration-based energy harvesters are usually designed to exhibit natural frequencies that match those of the excitation for maximum power output. This has spurred interest into the design of devices that respond to variable frequency sources. In this work, an electromagnetic energy harvester in the form of a base excited trapezoidal plate is proposed. The plate geometry is designed to achieve two closely spaced vibration modes in order to harvest energy across a broader bandwidth. The ensuing bending and twisting vibrations are utilized in this capacity by placing a magnet on the plate tip that moves past a stationary coil. A dynamic model is presented to predict the system performance and is verified experimentally.

scholarly journals Bending Vibration Analysis of Tensioned Ball Screw under Nonuniform Stress during the Cutting Process

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Cheng Zhang ◽  
Jianrun Zhang
Keyword(s):  
Differential Equation ◽  
Natural Frequencies ◽  
Beam Theory ◽  
Cutting Process ◽  
Ball Screw ◽  
Segmentation Method ◽  
Bending Vibration ◽  
Nonuniform Stress ◽  
Euler Bernoulli Beam ◽  
Force Data

The bending vibration of tensioned ball screw under nonuniform stress in the cutting process is analyzed in this paper. Differential equation of a beam under nonuniform prestress is derived according to Euler–Bernoulli beam theory. A method to solve the differential equation under different boundary conditions is proposed based on the segmentation method. The correctness of the method is verified by comparison with the traditional method and experiment, respectively. The dynamic analysis of tensioned ball screw under nonuniform stress in the cutting process is carried out with this method. The influence of the location on the ball screw and amplitude of the axial force produced in the cutting process on natural frequencies of ball screw is researched. Results show that the greater the force, the greater the change in natural frequencies. Furthermore, the change of first two natural frequencies presents a simple harmonic trend with the force moving along the ball screw. Taking a set of cutting force data as an example, the instantaneous frequency of tensioned ball screw in the cutting process is calculated in the end.

Heartbeat Energy Harvesting Using the Fan-Folded Piezoelectric Beam Geometry

2015 ◽  
Author(s):  
M. H. Ansari ◽  
M. Amin Karami
Keyword(s):  
Natural Frequency ◽  
Energy Harvester ◽  
Low Frequency ◽  
Mode Shapes ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Mechanical Coupling ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Piezoelectric Beam

A three dimensional piezoelectric vibration energy harvester is designed to generate electricity from heartbeat vibrations. The device consists of several bimorph piezoelectric beams stacked on top of each other. These horizontal bimorph beams are connected to each other by rigid vertical beams making a fan-folded geometry. One end of the design is clamped and the other end is free. One major problem in micro-scale piezoelectric energy harvesters is their high natural frequency. The same challenge is faced in development of a compact vibration energy harvester for the low frequency heartbeat vibrations. One way to decrease the natural frequency is to increase the length of the bimorph beam. This approach is not usually practical due to size limitations. By utilizing the fan-folded geometry, the natural frequency is decreased while the size constraints are observed. The required size limit of the energy harvester is 1 cm by 1 cm by 1 cm. In this paper, the natural frequencies and mode shapes of fan-folded energy harvesters are analytically derived. The electro-mechanical coupling has been included in the model for the piezoelectric beam. The design criteria for the device are discussed.

Sign in / Sign up

Export Citation Format

Share Document