Fan-structure wind energy harvester using circular array of polyvinylidene fluoride cantilevers

2016 ◽  
Vol 28 (5) ◽  
pp. 653-662 ◽  
Author(s):  
Fengxian Bai ◽  
Guoliang Song ◽  
Weijie Dong ◽  
Lijuan Guan ◽  
Huayu Bao
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Output Power ◽  
Lead Zirconate Titanate ◽  
Polyvinylidene Fluoride ◽  
Energy Harvester ◽  
Lead Zirconate ◽  
Circular Array ◽  
Piezoelectric Energy ◽  
The Impact

A fan-structure piezoelectric energy harvester was proposed and tested in order to collect wind energy. Polyvinylidene fluoride was chosen due to its flexibility and longevity when compared to lead zirconate titanate. The impact-induced piezoelectric energy harvester consists of a stator and a rotor and a circular array of four cantilevers, utilize the rotor blades’ periodic impact on the free end of the cantilevers to generate oscillatory motion of cantilevers. A circular array of polyvinylidene fluoride cantilevers was fixed around the rotor in order to increase output power, save space at the same time. Static and transient characteristics of different cantilevers were investigated using finite element method and the result showed that polyvinylidene fluoride triangular cantilever performs the best in output voltage and power. Under the condition of optimal impedance and optimal overlap distance, a sum AC output power of four cantilevers without connection to each other approach to 0.75 mW was measured at the wind speed of 7 m/s when the blade number of rotor is 7 or 9. Two branches 0.27 mW DC output power was obtained when each two cantilevers in parallel connection in the case of full-wave rectification of each cantilever at the wind speed of 7 m/s.

Powering In-pipe Wireless Sensors Using Flexible Piezoelectric Micro-generators

2016 ◽  
Vol 3 (3) ◽  
Author(s):  
Sherif Keddis ◽  
Norbert Schwesinger
Keyword(s):  
Lead Zirconate Titanate ◽  
Polyvinylidene Fluoride ◽  
Energy Harvester ◽  
Lead Zirconate ◽  
Sensor Nodes ◽  
Wireless Sensor Nodes ◽  
Duty Cycling ◽  
Piezoelectric Energy ◽  
Sufficient Energy ◽  
The Common

AbstractThis paper presents a new piezoelectric energy harvester that generates sufficient energy to power wireless sensor nodes autonomously. Multiple PVDF-foils are layered alternately with electrode foils and wound to a spool. Due to induced turbulence inside standard flow pipes the piezoelectric foils are forced to oscillate converting kinetic energy into mechanical stress thus generating electrical charge. The new multilayer spool design tackles the common disadvantages of similar harvesters related to low piezoelectric coefficients of Polyvinylidene-fluoride or brittleness of Lead-zirconate-titanate. Wind channel experiments to prove the feasibility of the concept result in a harvested output power of 0.54 μW at a wind velocity of 7 m/s. With efficient duty cycling of the sensor node 324 μWs of energy are available for data transmission. The presented harvester is proposed as a universal power supply for sensors inside pipe systems. All of the systems components are included inside the pipe allowing for a maintenance-free deployment of sensors in remote locations.

scholarly journals Optimization of Galloping Piezoelectric Energy Harvester with V-Shaped Groove in Low Wind Speed

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4619 ◽  
Author(s):  
Kaiyuan Zhao ◽  
Qichang Zhang ◽  
Wei Wang
Keyword(s):  
Wind Speed ◽  
Output Power ◽  
Critical Velocity ◽  
Energy Harvester ◽  
Windward Side ◽  
Flow Induced Vibration ◽  
Vibration Energy Harvester ◽  
Low Wind Speed ◽  
Local Hopf Bifurcation ◽  
Piezoelectric Energy

A square cylinder with a V-shaped groove on the windward side in the piezoelectric cantilever flow-induced vibration energy harvester (FIVEH) is presented to improve the output power of the energy harvester and reduce the critical velocity of the system, aiming at the self-powered supply of low energy consumption devices in the natural environment with low wind speed. Seven groups of galloping piezoelectric energy harvesters (GPEHs) were designed and tested in a wind tunnel by gradually changing the angle of two symmetrical sharp angles of the V-groove. The GPEH with a sharp angle of 45° was selected as the optimal energy harvester. Its output power was 61% more than the GPEH without the V-shaped groove. The more accurate mathematical model was made by using the sparse identification method to calculate the empirical parameters of fluid based on the experimental data and the theoretical model. The critical velocity of the galloping system was calculated by analyzing the local Hopf bifurcation of the model. The minimum critical velocity was 2.53 m/s smaller than the maximum critical velocity at 4.69 m/s. These results make the GPEH with a V-shaped groove (GPEH-V) more suitable to harvest wind energy efficiently in a low wind speed environment.

Numerical research on a vortex shedding induced piezoelectric-electromagnetic energy harvester

2021 ◽  
pp. 1045389X2110116
Author(s):  
Xia Li ◽  
Zhiyuan Li ◽  
Benxue Liu ◽  
Jun Zhang ◽  
Weidong Zhu
Keyword(s):  
Wind Speed ◽  
Output Power ◽  
Vortex Shedding ◽  
Energy Harvester ◽  
Hybrid Structure ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Piezoelectric Energy ◽  
Speed Range ◽  
Electromechanical Coupled

To widen the operation wind speed bandwidth of a classic vortex shedding induced vibration piezoelectric energy harvester, a piezoelectric-electromagnetic hybrid energy harvester based on vortex shedding induced vibration is designed. The hybrid vortex shedding induced vibration energy harvester (HVSIVEH) includes a vortex shedding induced vibration piezoelectric energy harvester (VSIVPEH) and an electromagnetic vibration energy harvester (EVEH). The electromechanical coupled vibration model of the hybrid structure was established. By comparing the variations of the output power as a function of the wind speed of the HVSIVEH and the classic VSIVPEH, it is found that the power response curve of the HVSIVEH has two peaks. The hybrid structure can broaden the working wind speed range. The lower the requirement on the output power level, the more obvious the effect of widening the wind speed range. By the solution and analysis of the electromechanical coupled model, better values of related parameters of the HVSIVEH are obtained. The first and second peaks of the output power of the HVSIVEH show better values of 1.9 and 2.2 mW, respectively, under these parameters.

Modeling and Analysis the Effect of PZT Area on Square Shaped Substrate for Power Enhancement in MEMS Piezoelectric Energy Harvester

2017 ◽  
Vol 26 (09) ◽  
pp. 1750128 ◽  
Author(s):  
Babak Montazer ◽  
Utpal Sarma
Keyword(s):  
Lead Zirconate Titanate ◽  
Power Output ◽  
Energy Harvester ◽  
Single Layer ◽  
Beam Theory ◽  
Lead Zirconate ◽  
Modeling And Analysis ◽  
Piezoelectric Energy ◽  
Resonance Frequencies ◽  
Array Structure

Modeling and analysis of a MEMS piezoelectric (PZT-Lead Zirconate Titanate) unimorph cantilever with different substrates are presented in this paper. Stainless steel and Silicon [Formula: see text] are considered as substrate. The design is intended for energy harvesting from ambient vibrations. The cantilever model is based on Euler–Bernoulli beam theory. The generated voltage and power, the current density, resonance frequencies and tip displacement for different geometry (single layer and array structure) have been analyzed using finite element method. Variation of output power and resonant frequency for array structure with array elements connected in parallel have been studied. Strain distribution is studied for external vibrations with different frequencies. The geometry of the piezoelectric layer as well as the substrate has been optimized for maximum power output. The variation of generated power output with frequency and load has also been presented. Finally, several models are introduced and compared with traditional array MEMS energy harvester.

PZT Piezoelectric Energy Harvester Enhancement Using Slotted Aluminium Beam

2014 ◽  
Vol 1051 ◽  
pp. 932-936
Author(s):  
Mun Heng Lam ◽  
Hanim Salleh
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Lead Zirconate Titanate ◽  
Output Voltage ◽  
Energy Harvester ◽  
Lead Zirconate ◽  
External Beam ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Wide Range

This paper presents work on improving piezoelectric energy harvesters. Harvesting energy from vibrations has received massive attention due to it being a renewable energy source that has a wide range of applications. Over the years of development, there is always research to further improve and optimise piezoelectric energy harvesters. For this paper, the piezoelectric specimen is made of PZT (Lead Zirconate Titanate), brass reinforced and has 31.8mm length, 12.7mm width and 0.511mm thick. An external beam is implemented to provide deflection amplification which in turn increases the output of the energy harvester. Depending on the configuration of the external beam, it can amplify output voltage from 100% to 300%.

Effects of Geometrical Parameters on Performances of Wind Energy Harvester with a Chamber

2013 ◽  
Vol 562-565 ◽  
pp. 1075-1079
Author(s):  
Xue Feng He ◽  
Yi Fu Fang ◽  
Zhi Gang Du
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Output Power ◽  
Energy Harvester ◽  
Maximum Output Power ◽  
Geometrical Parameters ◽  
Flexible Beam ◽  
Front Wall ◽  
Maximum Output ◽  
Critical Wind Speed

To improve the performances under low speed wind, a wind energy harvester similar to harmonicas was proposed. The harvester mainly includes a cuboid chamber and a cantilevered beam. The front wall of the chamber is opened as the air entrance and a rectangular hole is opened on the sidewall as the exit. The cantilever composed of a piezoelectric sheet and a flexible beam was fixed onto the sidewall of the chamber near the exit. Experimental results show that the width and height of the chamber significantly affect critical wind speed and output power, respectively. The initial attack angle of the cantilever has important influence on the critical wind speed. Blunt body at the air entrance could remarkably decrease the critical wind speed. For a prototype with a 60 mm×20 mm×13 mm chamber, the length of the cantilever of 30 mm and the length of the piezoelectric sheet of 8 mm, the measured maximum output power is 1.1 mW under 17 m/s wind.

scholarly journals Wearable Shoe-Mounted Piezoelectric Energy Harvester for a Self-Powered Wireless Communication System

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 237
Author(s):  
Se Yeong Jeong ◽  
Liang Liang Xu ◽  
Chul Hee Ryu ◽  
Anuruddh Kumar ◽  
Seong Do Hong ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Lead Zirconate Titanate ◽  
Communication System ◽  
Energy Harvester ◽  
Uv Light ◽  
Lead Zirconate ◽  
Wireless Communication System ◽  
Wireless Transmitter ◽  
Piezoelectric Energy ◽  
Self Powered

This study covers a self-powered wireless communication system that is powered using a piezoelectric energy harvester (PEH) in a shoe. The lead-zirconate-titanate (PZT) ceramic of the PEH was coated with UV resin, which (after curing under UV light) allowed it to withstand periodic pressure. The PEH was designed with a simple structure and placed under the sole of a shoe. The durability of the PEH was tested using a pushing tester and its applicability in shoes was examined. With periodic compression of 60 kg, the PEH produced 52 μW of energy at 280 kΩ. The energy generated by the PEH was used to power a wireless transmitter. A step-down converter with an under-voltage lockout function was used to gather enough energy to operate the wireless transmitter. The transmitter can be operated initially after walking 24 steps. After the transmitter has been activated, it can be operated again after 8 steps. Because a control center receives signals from the transmitter, it is possible to check the status of workers who work outside at night or mostly alone, to detect emergencies.

scholarly journals Design, Modeling, and Experiments of the Vortex-Induced Vibration Piezoelectric Energy Harvester with Bionic Attachments

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Zunlong Jin ◽  
Guoping Li ◽  
Junlei Wang ◽  
Zhien Zhang
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Energy Harvester ◽  
Peak Voltage ◽  
Vortex Induced Vibration ◽  
Energy Capture ◽  
Measured Voltage ◽  
Piezoelectric Energy ◽  
Smooth Cylinder ◽  
Bionic Structure

Since the energy demand increases, the sources of fluid energy such as wind energy and marine energy have attracted widespread attention, especially vortex-induced vibrations excited by wind energy. It is well known that the lock-in effect in vortex-induced vibration can be applied to the piezoelectric energy harvester. Although numerous researches have been conducted on piezoelectric energy harvesting devices in recent years, a common problem of low bandwidth and harvesting efficiency still exists. In order to increase the response amplitude and decrease the threshold wind speed of vortex-induced vibration, a bionic attachment structure is proposed based on the experimental method. In the present work, twelve models are designed according to the size of pits and hemispheric protrusions which are added to the surface of a flexible smooth cylinder. Compared with the smooth cylinder which is taken as a carrier, the harvester with the bionic structure shows stronger energy capture performance on the whole. As the threshold speed decelerates from 1.8m/s to 1 m/s, the bandwidth, on the contrary, increases from 39.3% to 51.4%. Particularly, for the 10 mm pits structure with 5 columns, its peak voltage can reach 47 V, and its peak power can reach 1.21 mW with a resistance of 800 kΩ, 0.57 mW higher than that of the smooth cylinder. Comparatively speaking, the hemispherical projections structure figures with a much more different energy capturing characteristic. Starting from the column, the measured voltage of the hemispherical bionic harvester is much smaller than that of the smooth cylinder, with a peak voltage less than 15 V and a reducing bandwidth. However, compared with the smooth cylinder, hemispheric projections with 3 columns have a better energy capture effect with a measured voltage of 35V, a resistance of 800kΩ, and a wind speed of 3.097 m/s. Besides, its output power also enhances from 0.48 to 0.56 mW.

Sign in / Sign up

Export Citation Format

Share Document