scholarly journals A broadband E-shaped piezoelectric energy harvester based on vortex-shedding induced vibration from low velocity liquid flow

AIP Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 125214 ◽  
Author(s):  
Yili Hu ◽  
Fangxiao Mou ◽  
Bin Yang ◽  
Xiang Chen ◽  
Xiaolin Wang ◽  
...  
Keyword(s):  
Liquid Flow ◽  
Vortex Shedding ◽  
Energy Harvester ◽  
Low Velocity ◽  
Piezoelectric Energy

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 experimental study of a piezoelectric energy harvester from vortex shedding-induced vibration

2018 ◽  
Vol 162 ◽  
pp. 145-158 ◽  
Author(s):  
Yili Hu ◽  
Bin Yang ◽  
Xiang Chen ◽  
Xiaolin Wang ◽  
Jingquan Liu
Keyword(s):  
Experimental Study ◽  
Vortex Shedding ◽  
Energy Harvester ◽  
Piezoelectric Energy

An Energy Harvester From Airflow Induced Vibrations

2014 ◽  
Author(s):  
A. Nayyar ◽  
V. Stoilov
Keyword(s):  
Vortex Shedding ◽  
High Frequency ◽  
Output Voltage ◽  
Energy Harvester ◽  
Direct Conversion ◽  
Mechanical Resonator ◽  
Mechanical Vibrations ◽  
Power Generator ◽  
Piezoelectric Energy ◽  
Tightly Coupled

This paper presents piezoelectric energy power generator exploiting direct conversion of airflow into mechanical vibrations. The device consists of two tightly coupled parts: a mechanical resonator, which produces high-frequency mechanical oscillation from quasi-constant airflow, and piezoelectric power generator harvesting the energy from the resonator’s motion. The proposed energy harvester allows for locking up the devices lowest natural frequency to the vortex-shedding resonant frequency induced by the ambient energy source. The Energy Harvester demonstrated a peak-to-peak output voltage of 20V at 10Hz, from an input wind velocity of ∼7 m/s.

scholarly journals A Multi-Mode Broadband Vibration Energy Harvester Composed of Symmetrically Distributed U-Shaped Cantilever Beams

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 203
Author(s):  
Xiaohua Huang ◽  
Cheng Zhang ◽  
Keren Dai
Keyword(s):  
Energy Harvester ◽  
Low Frequency ◽  
Experimental Results ◽  
Vibration Energy ◽  
Cantilever Beams ◽  
Resonant Frequencies ◽  
Promising Alternative ◽  
Piezoelectric Energy ◽  
Straight Beam ◽  
Resonance Frequencies

Using the piezoelectric effect to harvest energy from surrounding vibrations is a promising alternative solution for powering small electronic devices such as wireless sensors and portable devices. A conventional piezoelectric energy harvester (PEH) can only efficiently collect energy within a small range around the resonance frequency. To realize broadband vibration energy harvesting, the idea of multiple-degrees-of-freedom (DOF) PEH to realize multiple resonant frequencies within a certain range has been recently proposed and some preliminary research has validated its feasibility. Therefore, this paper proposed a multi-DOF wideband PEH based on the frequency interval shortening mechanism to realize five resonance frequencies close enough to each other. The PEH consists of five tip masses, two U-shaped cantilever beams and a straight beam, and tuning of the resonance frequencies is realized by specific parameter design. The electrical characteristics of the PEH are analyzed by simulation and experiment, validating that the PEH can effectively expand the operating bandwidth and collect vibration energy in the low frequency. Experimental results show that the PEH has five low-frequency resonant frequencies, which are 13, 15, 18, 21 and 24 Hz; under the action of 0.5 g acceleration, the maximum output power is 52.2, 49.4, 61.3, 39.2 and 32.1 μW, respectively. In view of the difference between the simulation and the experimental results, this paper conducted an error analysis and revealed that the material parameters and parasitic capacitance are important factors that affect the simulation results. Based on the analysis, the simulation is improved for better agreement with experiments.

scholarly journals Research on a Piezoelectric Energy Harvester with Rotating Magnetic Excitation

2021 ◽  
Author(s):  
Zhe Wang ◽  
Lipeng He ◽  
Zheng Zhang ◽  
Ziming Zhou ◽  
Jianwen Zhou ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Magnetic Excitation ◽  
Piezoelectric Energy

scholarly journals Analytical Modeling of a Doubly Clamped Flexible Piezoelectric Energy Harvester with Axial Excitation and Its Experimental Characterization

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3861
Author(s):  
Jie Mei ◽  
Qiong Fan ◽  
Lijie Li ◽  
Dingfang Chen ◽  
Lin Xu ◽  
...  
Keyword(s):  
Output Power ◽  
Power Output ◽  
Output Voltage ◽  
Energy Harvester ◽  
Load Resistance ◽  
Engineering Practice ◽  
Maximum Output ◽  
Widespread Application ◽  
Piezoelectric Energy ◽  
Axial Excitation

With the rapid development of wearable electronics, novel power solutions are required to adapt to flexible surfaces for widespread applications, thus flexible energy harvesters have been extensively studied for their flexibility and stretchability. However, poor power output and insufficient sensitivity to environmental changes limit its widespread application in engineering practice. A doubly clamped flexible piezoelectric energy harvester (FPEH) with axial excitation is therefore proposed for higher power output in a low-frequency vibration environment. Combining the Euler–Bernoulli beam theory and the D’Alembert principle, the differential dynamic equation of the doubly clamped energy harvester is derived, in which the excitation mode of axial load with pre-deformation is considered. A numerical solution of voltage amplitude and average power is obtained using the Rayleigh–Ritz method. Output power of 22.5 μW at 27.1 Hz, with the optimal load resistance being 1 MΩ, is determined by the frequency sweeping analysis. In order to power electronic devices, the converted alternating electric energy should be rectified into direct current energy. By connecting to the MDA2500 standard rectified electric bridge, a rectified DC output voltage across the 1 MΩ load resistor is characterized to be 2.39 V. For further validation of the mechanical-electrical dynamical model of the doubly clamped flexible piezoelectric energy harvester, its output performances, including both its frequency response and resistance load matching performances, are experimentally characterized. From the experimental results, the maximum output power is 1.38 μW, with a load resistance of 5.7 MΩ at 27 Hz, and the rectified DC output voltage reaches 1.84 V, which shows coincidence with simulation results and is proved to be sufficient for powering LED electronics.

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