scholarly journals Optimization of a Tunable Piezoelectric Harvester Applied to Multimodal Structures

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Stella Brach ◽  
Giovanni Caruso ◽  
Giuseppe Vairo
Keyword(s):  
Energy Harvesting ◽  
Degrees Of Freedom ◽  
Piezoelectric Materials ◽  
Electric Circuit ◽  
Portable Devices ◽  
Vibration Source ◽  
Vibration Modes ◽  
Resonance Frequencies ◽  
Constant Growth ◽  
Piezoelectric Harvester

The field of energy harvesting experienced a constant growth in the last years, due to the possibility of developing standing-alone wireless portable devices with extended life. In this context, piezoelectric materials appear to be particularly effective for the development of harvesters able to scavenge energy from ambient vibrations. In this paper a piezoactuated cantilever beam used for energy harvesting purposes is considered, extracting energy from a vibration source applied at the clamped boundary. The piezoelectric dimensions and position are optimized in order to maximize the coupling on the vibration modes of interest. An electric circuit containing a resistor and an inductor, connected to the piezoelectric electrodes, is optimized, for extracting the maximum electric power for any frequency of the vibration source, accounting for several vibration modes of the structure. The inductance is used to compensate the presence of a mistuning between the vibration source and the cantilever resonance frequencies. Proposed analysis shows that a single inductance is much effective when the harvester can be treated essentially as a single-degree-of-freedom structure. For harvesters with multiple degrees-of-freedom a single inductance can perform only a trade-off compensation of the mistuning between the various modes.

scholarly journals Energy Harvesting from Vehicle Suspension System by Piezoelectric Harvester

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Zhen Zhao ◽  
Tie Wang ◽  
Baifu Zhang ◽  
Jinhong Shi
Keyword(s):  
Energy Harvesting ◽  
Degrees Of Freedom ◽  
Inertial Mass ◽  
Vehicle Suspension ◽  
Roughness Coefficient ◽  
Generation Model ◽  
Vehicle Speed ◽  
Suspension Systems ◽  
Suspension Model ◽  
Piezoelectric Harvester

In this paper, a new type of piezoelectric harvester for vehicle suspension systems is designed and presented that addresses the current problems of low energy density, vibration energy dissipation, and reduced energy harvesting efficiency in current technologies. A new dual-mass, two degrees of freedom (2-DOF), suspension dynamic model for the harvester was developed for the inertial mass and the force of the energy conversion component by combining with the piezoelectric power generation model, the rotor dynamics model, and the traditional 2-DOF suspension model. The influence of factors such as vehicle speed, the parameters of the harvester, and road classification on the root mean square (RMS) of the generated electric power is discussed. The results show that the RMS increases with the increase of the speed of the vehicle, the thickness and length of piezoelectric patches and magnetic slabs, and the residual flux density of magnets and road roughness coefficient and with the decrease of the width of piezoelectric patches and magnetic slabs and the space between the stator ring and the rotator ring. In the present research, a power of up to 332.4 W was harvested. The proposed model provides a powerful reference for future studies of energy harvesting from vehicle suspension systems.

Small Wind Energy Harvesting From Galloping Using Piezoelectric Materials

2012 ◽  
Author(s):  
Liya Zhao ◽  
Lihua Tang ◽  
Yaowen Yang
Keyword(s):  
Wind Tunnel ◽  
Energy Harvesting ◽  
Wind Energy ◽  
Cross Sections ◽  
Significant Influence ◽  
Systematic Study ◽  
Piezoelectric Materials ◽  
Energy Harvesters ◽  
Peak Output Power ◽  
Piezoelectric Harvester

A galloping piezoelectric harvester for small wind energy harvesting usually consists of a cantilever beam clamped at one end and a tip body attached to its free end. The tip body has significant influence on the aeroelastic characteristic of the harvester thus the efficiency of energy harvesting. However, no systematic study on the tip body is available in the literature. This article focuses on the effect of tip body on the performance of the harvester. A prototype device is fabricated with different tip bodies having various cross sections, lengths, and masses. Wind tunnel tests are conducted to determine the influence of these parameters on the power generated. A peak output power of 8.4 mW is achieved at a wind velocity of 8 m/s for the harvester with a tip of square section. An analytical model integrating electromechanical and aerodynamic formulations is established, and the results agree well with the experiments. It is recommended that the tip of square section should be used for galloping energy harvesters.

Modeling and Experimental Verification of Electromagnetic Energy Harvesting From Plate Structures

2012 ◽  
Author(s):  
Mohamed M. R. El-Hebeary ◽  
Mustafa H. Arafa ◽  
Said M. Megahed
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Electromagnetic Energy ◽  
Vibration Modes ◽  
Vibration Energy Harvesting ◽  
Plate Structures ◽  
Resonance Frequencies ◽  
Modes Of Vibration ◽  
Electromagnetic Energy Harvesting ◽  
Plate Dynamic

The focus of the present work is on the design of plate structures for vibration energy harvesting from two closely-spaced modes of vibration. The work is motivated by the quest to design resonators that respond to variable-frequency sources of base motion. The geometry of two-dimensional structures, such as trapezoidal and V-shaped plates, is explored to obtain two closely-spaced harvestable vibration modes to scavenge energy across a broader bandwidth. To this end, an electromagnetic energy harvester in the form of a base excited plate is proposed. The plate carries tip magnets that oscillate past stationary coils to generate power from the first two modes of vibration. The plate dynamic behavior is governed by its geometry and placement of the magnets on its tip. An effort is made to optimize the system configuration so as to control the spacing between the resonance frequencies while efficiently harvesting energy from both modes. Findings of the present work are verified both numerically and experimentally.

scholarly journals Piezoelectric Vibration-Based Energy Harvesting Enhancement Exploiting Nonsmoothness

Actuators ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 25 ◽  
Author(s):  
Rodrigo Ai ◽  
Luciana Monteiro ◽  
Paulo Monteiro ◽  
Pedro Pacheco ◽  
Marcelo Savi
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Nonlinear Effects ◽  
Dynamical Analysis ◽  
Portable Devices ◽  
Energy Capacity ◽  
Resonance Frequencies ◽  
Harvesting Systems ◽  
Displacement Constraints ◽  
Piezoelectric Vibration

Piezoelectric vibration-based energy harvesting systems have been used as an interesting alternative power source for actuators and portable devices. These systems have an inherent disadvantage when operating in linear conditions, presenting a maximum power output by matching their resonance frequencies with the ambient source frequencies. Based on that, there is a significant reduction of the output power due to small frequency deviations, resulting in a narrowband harvester system. Nonlinearities have been shown to play an important role in enhancing the harvesting capacity. This work deals with the use of nonsmooth nonlinearities to obtain a broadband harvesting system. A numerical investigation is undertaken considering a single-degree-of-freedom model with a mechanical end-stop. The results show that impacts can strongly modify the system dynamics, resulting in an increased broadband output power harvesting performance and introducing nonlinear effects as dynamical jumps. Nonsmoothness can increase the bandwidth of the harvesting system but, on the other hand, limits the energy capacity due to displacement constraints. A parametric analysis is carried out monitoring the energy capacity, and two main end-stop characteristics are explored: end-stop stiffness and gap. Dynamical analysis using proper nonlinear tools such as Poincaré maps, bifurcation diagrams, and phase spaces is performed together with the analysis of the device output power and efficiency. This offers a deep comprehension of the energy harvesting system, evaluating different possibilities related to complex behaviors such as dynamical jumps, bifurcations, and chaos.

scholarly journals Energy harvesting with piezoelectric materials for IoT – Review

2019 ◽  
Vol 29 ◽  
pp. 03010
Author(s):  
Corina Covaci ◽  
Aurel Gontean
Keyword(s):  
Energy Harvesting ◽  
Mechanical Stress ◽  
Piezoelectric Materials ◽  
Piezoelectric Energy Harvesting ◽  
Portable Devices ◽  
Crystalline Materials ◽  
Smart Building ◽  
Piezoelectric Energy ◽  
Energy Consuming

The goal of this paper is to review up to date energy harvesting techniques, while focusing on energy harvesting with piezoelectric materials. A classification of various energy harvesting sources is provided in order to properly locate piezoelectricity. Piezoelectric energy harvesting uses the special material property that exists in many single crystalline materials: the direct piezoelectric effect. Those materials are generating electric potential when mechanical stress is applied. There are two types of mechanical stress suitable for piezoelectric energy harvesting: hitting and vibrating. The hitting method involves the direct transfer of energy to piezoelectric modules, so it generates more power than the vibrating method. This kind of energy harvesting is used to drive low energy consuming devices and is suitable for applications where replacement of battery or maintenance is unpractical, like sensors in the human body, for powering portable devices or it can be used for improvement of a smart building concept. If the piezoelectric transducers are placed in the floor of a crowded area or in shoes, it can theoretically generate 4.9 J/Step; therefore, this energy can be used to replace the chargeable batteries. This review is useful for a proper positioning of this type in the IoT broad context and mainly as an alternate energy source for wearables.

Piezoelectric Energy Harvesting and Testing Based on Forced Vibration

2014 ◽  
Vol 687-691 ◽  
pp. 3342-3345
Author(s):  
Min Hua Xu ◽  
Fa Rong Gao ◽  
Lu Lu Chen ◽  
Juan Hong Shen ◽  
Shan Shan Ren
Keyword(s):  
Energy Harvesting ◽  
Forced Vibration ◽  
Mechanical Energy ◽  
Energy Harvest ◽  
Vibration Source ◽  
Piezoelectric Energy ◽  
Bridge Rectifier ◽  
Harvesting Process ◽  
Rectifier Circuits ◽  
Piezoelectric Harvester

The methods of piezoelectric energy harvest and detection based on forced vibration are introduced in this paper. Firstly, the mechanical energy of the forced vibration is converted into alternating current energy by using the piezoelectric harvester, and then the AC currents are rectified through the full bridge rectifier circuits, and finally the capacitor filter circuits are adopted to obtain the stable DC output. It also implements the voltage waveform detection during above energy harvesting process. The experimental results show that piezoelectric oscillator has the characteristics of simple structure and support stability, and its forced vibration frequency is independent of the structural natural frequency. The piezoelectric harvester forced with the vibration source can obtain an effective energy-harvested electric output.

A two degrees of freedom comb capacitive-type accelerometer with low cross-axis sensitivity

2019 ◽  
Vol 13 (3) ◽  
pp. 5334-5346
Author(s):  
M. N. Nguyen ◽  
L. Q. Nguyen ◽  
H. M. Chu ◽  
H. N. Vu
Keyword(s):  
Degrees Of Freedom ◽  
Proof Mass ◽  
Vibration Modes ◽  
Electrode Structure ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Fully Differential ◽  
Mode Effects ◽  
The Finite Element Analysis ◽  
Cross Axis

In this paper, we report on a SOI-based comb capacitive-type accelerometer that senses acceleration in two lateral directions. The structure of the accelerometer was designed using a proof mass connected by four folded-beam springs, which are compliant to inertial displacement causing by attached acceleration in the two lateral directions. At the same time, the folded-beam springs enabled to suppress cross-talk causing by mechanical coupling from parasitic vibration modes. The differential capacitor sense structure was employed to eliminate common mode effects. The design of gap between comb fingers was also analyzed to find an optimally sensing comb electrode structure. The design of the accelerometer was carried out using the finite element analysis. The fabrication of the device was based on SOI-micromachining. The characteristics of the accelerometer have been investigated by a fully differential capacitive bridge interface using a sub-fF switched-capacitor integrator circuit. The sensitivities of the accelerometer in the two lateral directions were determined to be 6 and 5.5 fF/g, respectively. The cross-axis sensitivities of the accelerometer were less than 5%, which shows that the accelerometer can be used for measuring precisely acceleration in the two lateral directions. The accelerometer operates linearly in the range of investigated acceleration from 0 to 4g. The proposed accelerometer is expected for low-g applications.

Energy Harvesting Using Piezoelectric Materials on Microcantilevr Structure

2012 ◽  
Vol 2 (5) ◽  
pp. 252-255
Author(s):  
Rudresha K J Rudresha K J ◽  
◽  
Girisha G K Girisha G K
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Materials

scholarly journals Particle Size Effect of Lanthanum-Modified Bismuth Titanate Ceramics on Ferroelectric Effect for Energy Harvesting

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Sangmo Kim ◽  
Thi My Huyen Nguyen ◽  
Rui He ◽  
Chung Wung Bark
Keyword(s):  
Particle Size ◽  
Energy Harvesting ◽  
High Speed ◽  
High Performance ◽  
Bismuth Titanate ◽  
Vinylidene Fluoride ◽  
Piezoelectric Materials ◽  
Renewable Energy Sources ◽  
Particle Size Effect ◽  
Ferroelectric Materials

AbstractPiezoelectric nanogenerators (PNGs) have been studied as renewable energy sources. PNGs consisting of organic piezoelectric materials such as poly(vinylidene fluoride) (PVDF) containing oxide complex powder have attracted much attention for their stretchable and high-performance energy conversion. In this study, we prepared a PNG combined with PVDF and lanthanum-modified bismuth titanate (Bi4−XLaXTi3O12, BLT) ceramics as representative ferroelectric materials. The inserted BLT powder was treated by high-speed ball milling and its particle size reduced to the nanoscale. We also investigated the effect of particle size on the energy-harvesting performance of PNG without polling. As a result, nano-sized powder has a much larger surface area than micro-sized powder and is uniformly distributed inside the PNG. Moreover, nano-sized powder-mixed PNG generated higher power energy (> 4 times) than the PNG inserted micro-sized powder.

Multimodal pizza-shaped piezoelectric vibration-based energy harvesters

2021 ◽  
pp. 1045389X2110069
Author(s):  
Virgilio J Caetano ◽  
Marcelo A Savi
Keyword(s):  
Energy Harvesting ◽  
Frequency Spectrum ◽  
Optimization Procedure ◽  
Single Mode ◽  
Ambient Vibration ◽  
Vibration Source ◽  
Element Analysis ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Harvesting Systems

Energy harvesting from ambient vibration through piezoelectric devices has received a lot of attention in recent years from both academia and industry. One of the main challenges is to develop devices capable of adapting to diverse sources of environmental excitation, being able to efficiently operate over a broadband frequency spectrum. This work proposes a novel multimodal design of a piezoelectric energy harvesting system to harness energy from a wideband ambient vibration source. Circular-shaped and pizza-shaped designs are employed as candidates for the device, comparing their performance with classical beam-shaped devices. Finite element analysis is employed to model system dynamics using ANSYS Workbench. An optimization procedure is applied to the system aiming to seek a configuration that can extract energy from a broader frequency spectrum and maximize its output power. A comparative analysis with conventional energy harvesting systems is performed. Numerical simulations are carried out to investigate the harvester performances under harmonic and random excitations. Results show that the proposed multimodal harvester has potential to harness energy from broadband ambient vibration sources presenting performance advantages in comparison to conventional single-mode energy harvesters.

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