scholarly journals Performance Evaluation of a Vortex Induced Piezoelectric Energy Converter (VIPEC) with CFD Approach

2021 ◽  
Vol 13 (5) ◽  
pp. 2971
Author(s):  
Xinyu An ◽  
Haocai Huang ◽  
Baowei Song ◽  
Congcong Ma
Keyword(s):  
Output Voltage ◽  
Fluid Dynamic ◽  
Electric Energy ◽  
Energy Transition ◽  
Beam Length ◽  
Separation Angle ◽  
Energy Converter ◽  
Piezoelectric Energy ◽  
Shedding Frequency ◽  
Sas Model

A novel vortex induced piezoelectric energy converter (VIPEC) was present in this paper to harvest flow kinetic energy from the ambient environment through a piezoelectric beam. The converter consists of a circular cylinder, a pivoted beam attached to the tail of the cylinder and several piezoelectric patches. Vortex induced pressure difference acts on the beam and drives the beam to squeeze piezo patches to convert fluid dynamic energy into electric energy. Transition Shear Stress Transport (SST) combined with Scale Adaptive Simulation (SAS) model was employed to predict the turbulent flow and flow separation around the cylinder with various beam lengths at high Reynolds number of 8 × 104 based on the computational fluid dynamics (CFD) approach. The accuracy of SST-SAS model was investigated through verification and validation studies. The output voltage equation was derived from the piezoelectric constitutive equation. It was revealed that the beam length influences the flow wake pattern, the separation angle and shedding frequency greatly through changing the adverse pressure gradient around the cylinder. The wake pattern becomes symmetrical about the beam when the beam length is longer than a critical value. The length of the beam has little influence on the separation angle. When the beam length is about 1.3 times the diameter of the cylinder, the shedding frequency and output voltage achieves its maximum, and the separation angle is minimal. Maximal output voltage reaches 20 mV.

scholarly journals Research of modular multilevel converter with phase-shifted pulse-width modulation

2021 ◽  
Vol 280 ◽  
pp. 05009
Author(s):  
Ihor Kozakevych ◽  
Roman Siyanko
Keyword(s):  
Mathematical Model ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Electric Energy ◽  
Point Of View ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Energy Converter ◽  
Circulating Current

The work is devoted to the study of performance of a multilevel electric energy converter using phase-shifted pulse-width modulation. Equations describing the state of a dynamic system multilevel converter - load are investigated and a mathematical model of the system in Matlab / Simulink environment has been constructed. Variants of implementation of phase-shifted pulse-width modulation systems from the point of view of influence on harmonics of output voltage and magnitude of circulating current in the converter are investigated.

Research of Street Lighting System Based on Piezoelectric Energy Generator

2014 ◽  
Vol 609-610 ◽  
pp. 1412-1416
Author(s):  
Xi Wen Wei ◽  
Li Ping Shi ◽  
Yan Bo Wei ◽  
Jie Huang
Keyword(s):  
Piezoelectric Ceramic ◽  
Output Voltage ◽  
Lithium Battery ◽  
Piezoelectric Effect ◽  
Electric Energy ◽  
Experimental Demonstration ◽  
Lighting System ◽  
Street Lighting ◽  
Led Lighting ◽  
Piezoelectric Energy

The paper do some research on the positive piezoelectric effect of piezoelectric ceramic stack. Piezoelectric energy generator is laid on the highway surface, and using the stress which is generated by piezoelectric device to generate electric energy when the vehicle is passing. The generated electric energy is stored in the lithium battery package for street lighting at night after the circuit adjustment. The experimental demonstration and theoretical analysis show that the electric energy generated in piezoelectric stack can be stored in 12V-12Ah lithium battery package within 12h by the circuit of 3F ultracapacitor and LM2575HVT-12V regulator when the output voltage of LM2575HVT-12V is 12V. 12V-12Ah lithium battery package supply energy to the 12V, 12W high power LED lighting for 12h, and meeting the street lighting standards.

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.

Novel Trapezoidal-Loop Piezoelectric Energy Harvester

2014 ◽  
Vol 672-674 ◽  
pp. 402-406
Author(s):  
Bing Jiang ◽  
Shuai Yuan ◽  
Xiao Hui Xu ◽  
Mao Sheng Ding ◽  
Ye Yuan ◽  
...  
Keyword(s):  
Output Voltage ◽  
Energy Harvester ◽  
Research Field ◽  
Structure Design ◽  
Loop Structure ◽  
Element Analysis ◽  
Resonant Frequencies ◽  
First Order ◽  
Microelectronic Devices ◽  
Piezoelectric Energy

In recent years, piezoelectric energy harvester which can replace the traditional battery supply has become a hot topic in global research field of microelectronic devices. Characteristics of a trapezoidal-loop piezoelectric energy harvester (TLPEH) were analyzed through finite-element analysis. The output voltage density is 4.251V/cm2 when 0.1N force is applied to the free end of ten-arm energy harvester. Comparisons of the resonant frequencies and output voltages were made. The first order resonant frequency could reach 15Hz by increasing the number of arms. Meanwhile, the output voltage is improved greatly when excited at first-order resonant frequencies. The trapezoidal-loop structure of TLPEH could enhance frequency response, which means scavenging energy more efficiently in vibration environment. The TLPEH mentioned here might be useful for the future structure design of piezoelectric energy harvester with low resonance frequency.

Design of a piezoelectric energy conversion based wind generator

2021 ◽  
pp. 002072092110134
Author(s):  
Sibel Akkaya Oy ◽  
Ali Ekber Özdemir
Keyword(s):  
Low Power ◽  
Energy Conversion ◽  
Output Voltage ◽  
Sensor Nodes ◽  
Maximum Output ◽  
Wireless Sensor Nodes ◽  
Wind Speeds ◽  
Wind Generator ◽  
Piezoelectric Energy ◽  
Renewable Energy Generation

This manuscript presents a new experimental wind generator based on piezoelectric energy conversion for low power applications. The aim is to demonstrate an alternative renewable energy generation method for low power applications. The generator has four blades of a propeller equipped with a total of twenty-four (24) thin film piezoelectric transducers (TFPTs). The output voltage is generated using a newly developed circuit topology. The generator was tested at three wind speeds 10 m/s, 14 m/s and 18 m/s, with a maximum output voltage of 10.2 V being produced at a wind speed of 18 m/s. Results show that this generator has promise to be suitable for low power batteryless applications, for example wireless sensor nodes (WSN).

Mathematical Modeling and Scaling of the Friction Losses of a Mechanical Gyroscope

2018 ◽  
Vol 10 (03) ◽  
pp. 1850024 ◽  
Author(s):  
Nicola Pozzi ◽  
Mauro Bonfanti ◽  
Giuliana Mattiazzo
Keyword(s):  
Wave Energy ◽  
Fluid Dynamic ◽  
Scaling Law ◽  
Full Scale ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Friction Forces ◽  
Efficiency Optimization ◽  
Energy Field ◽  
Model Of Friction

Friction is a complicated phenomenon that plays a central role in a wide variety of physical systems. An accurate modeling of the friction forces is required in the model-based design approach, especially when the efficiency optimization and system controllability are the core of the design. In this work, a gyroscopic unit is considered as case study: the flywheel rotation is affected by different friction sources that needs to be compensated by the flywheel motor. An accurate modeling of the dissipations can be useful for the system efficiency optimization. According to the inertial sea wave energy converter (ISWEC) gyroscope layout, friction forces are modeled and their dependency with respect to the various physical quantities involved is examined. The mathematical model of friction forces is validated against the experimental data acquired during the laboratory testing of the ISWEC gyroscope. Moreover, in the wave energy field, it is common to work with scale prototypes during the full-scale device development. For this reason, the scale effect on dissipations has been correlated based on the Froude scaling law, which is commonly used for wave energy converter scaling. Moreover, a mixed Froude–Reynolds scaling law is taken into account, in order to maintain the scale of the fluid-dynamic losses due to flywheel rotation. The analytical study is accompanied by a series of simulations based on the properties of the ISWEC full-scale gyroscope.

Comparative study of conventional and magnetically coupled piezoelectric energy harvester to optimize output voltage and bandwidth

2016 ◽  
Vol 23 (7) ◽  
pp. 2663-2674 ◽  
Author(s):  
Dauda Sh. Ibrahim ◽  
Asan G. A. Muthalif ◽  
N. H. Diyana Nordin ◽  
Tanveer Saleh
Keyword(s):  
Comparative Study ◽  
Output Voltage ◽  
Energy Harvester ◽  
Piezoelectric Energy

Broadband Rotational Energy Harvesting Using Micro Energy Harvester

2018 ◽  
Author(s):  
Jui-Ta Chien ◽  
Yung-Hsing Fu ◽  
Chao-Ting Chen ◽  
Shun-Chiu Lin ◽  
Yi-Chung Shu ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Output Voltage ◽  
Energy Harvester ◽  
Low Frequency ◽  
Rotational Energy ◽  
Open Circuit ◽  
Maximum Output ◽  
Rotational Excitation ◽  
Rotating Speed ◽  
Piezoelectric Energy

This paper proposes a broadband rotational energy harvesting setup by using micro piezoelectric energy harvester (PEH). When driven in different rotating speed, the PEH can output relatively high power which exhibits the phenomenon of frequency up-conversion transforming the low frequency of rotation into the high frequency of resonant vibration. It aims to power self-powered devices used in the applications, like smart tires, smart bearings, and health monitoring sensors on rotational machines. Through the excitation of the rotary magnetic repulsion, the cantilever beam presents periodically damped oscillation. Under the rotational excitation, the maximum output voltage and power of PEH with optimal impedance is 28.2 Vpp and 663 μW, respectively. The output performance of the same energy harvester driven in ordinary vibrational based excitation is compared with rotational oscillation under open circuit condition. The maximum output voltage under 2.5g acceleration level of vibration is 27.54 Vpp while the peak output voltage of 36.5 Vpp in rotational excitation (in 265 rpm).

scholarly journals Piezoelectric Energy Generators Based on Spring and Inertial Mass

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2163 ◽  
Author(s):  
Sanghyun Yoon ◽  
Jinhwan Kim ◽  
Kyung-Ho Cho ◽  
Young-Ho Ko ◽  
Sang-Kwon Lee ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Electric Energy ◽  
Inertial Mass ◽  
Design Parameters ◽  
Mechanical Shock ◽  
Generator System ◽  
Energy Harvesters ◽  
Shock Energy ◽  
Piezoelectric Energy ◽  
And Performance

In this study, inertial mass-based piezoelectric energy generators with and without a spring were designed and tested. This energy harvesting system is based on the shock absorber, which is widely used to protect humans or products from mechanical shock. Mechanical shock energies, which were applied to the energy absorber, were converted into electrical energies. To design the energy harvester, an inertial mass was introduced to focus the energy generating position. In addition, a spring was designed and tested to increase the energy generation time by absorbing the mechanical shock energy and releasing a decreased shock energy over a longer time. Both inertial mass and the spring are the key design parameters for energy harvesters as the piezoelectric materials, Pb(Mg1/3Nb2/3)O3-PbTiO3 piezoelectric ceramics were employed to store and convert the mechanical force into electric energy. In this research, we will discuss the design and performance of the energy generator system based on shock absorbers.

scholarly journals Possibilities of Energy Harvesting from the Suspension System of the Internal Combustion Engine in a Vehicle

2021 ◽  
Vol 23 (2) ◽  
pp. B106-B116
Author(s):  
Jacek Caban ◽  
Grzegorz Litak ◽  
Bartłomiej Ambrożkiewicz ◽  
Leszek Gardyński ◽  
Paweł Stączek ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Power Supply ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Electric Energy ◽  
Elastic Beam ◽  
Experimental Tests ◽  
Suspension System ◽  
Piezoelectric Energy ◽  
Mechanic Energy

The automotive industry faces huge challenge in environmental protection by reducing fossil fuels and energy consumption by developing various practical solutions in energy harvesting. The current analysis is related to the diesel engine power supply system in a passenger off-road vehicle for application of the piezoelectric energy harvesting system. Experimental tests were carried out for the three constant rotational speed values - 800, 1000 and 1500 rpm. The results pertained to operational and simulation tests of available power supply options from the engine suspension system in the vehicle, e.g. to power sensors supervising the engine’s operation or other small electrical devices in the vehicle. The simulations of output voltage were conducted by means of a nonlinear model with a resonator coupled to a piezoelectric elastic beam deformed in the magnetic field to improve the band of frequency transducing kinetic mechanic energy into electric energy.

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