The document discusses the design and optimization of a piezoelectric energy harvester for low frequency applications. It analyzes how varying the geometrical parameters of the harvester, including the proof mass shape and amount of coverage, can affect the resonant frequency and output power. Simulation results show that a harvester with an optimized proof mass and beam design can achieve lower resonance and higher power compared to conventional designs.
COUPLED FIELD ANALYSIS OF PIEZOELECTRIC CANTILEVER BEAMijiert bestjournal
Electromechanical modelling efforts in the research field of vibration-based energy harvesting have been mostly focused on forms of vibrational in put as in the typical case of harmonic excitation at resonance. However,ambient vibration al energy often has broader frequency content than a single harmonic. Piezoelectric energ y harvesting is a promising technology for extracting the power from environmental vibrations. It generates the electrical power of few orders of amplitudes which is sufficient to drive s everal autonomous electrical devices. Such vibration-based energy harvester generates the most energy when the generator is excited at its resonance frequency. Simplest model to be start ed is of rectangular Aluminium cantilever beam with unimorph piezoelectric patch which is per fectly bonded to the substrate plate at the end. The resulting relative motion between the piez oelectric patch and the base produces stress on piezoelectric material,which is converte d into electrical power by virtue of direct piezoelectric effect. The ability of piezoelectric material of different thickness to generate voltage at different frequency is explained in this paper. Its capability to work over a range of frequency is predicted by use of ANSYS software. Th e solid model is design and analyzed using finite element software.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
COUPLED FIELD ANALYSIS OF PIEZOELECTRIC CANTILEVER BEAMijiert bestjournal
Electromechanical modelling efforts in the research field of vibration-based energy harvesting have been mostly focused on forms of vibrational in put as in the typical case of harmonic excitation at resonance. However,ambient vibration al energy often has broader frequency content than a single harmonic. Piezoelectric energ y harvesting is a promising technology for extracting the power from environmental vibrations. It generates the electrical power of few orders of amplitudes which is sufficient to drive s everal autonomous electrical devices. Such vibration-based energy harvester generates the most energy when the generator is excited at its resonance frequency. Simplest model to be start ed is of rectangular Aluminium cantilever beam with unimorph piezoelectric patch which is per fectly bonded to the substrate plate at the end. The resulting relative motion between the piez oelectric patch and the base produces stress on piezoelectric material,which is converte d into electrical power by virtue of direct piezoelectric effect. The ability of piezoelectric material of different thickness to generate voltage at different frequency is explained in this paper. Its capability to work over a range of frequency is predicted by use of ANSYS software. Th e solid model is design and analyzed using finite element software.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Piezoelectric effect is the effect of converting pressure into electricity. There is a specific type of material which converts the pressure/deformity in the size into electricity.
There are abundant of wave energy converter technologies available to convert wave energy into useable energy. However, most of them are huge and suitable for large application. Thus, this paper aimed to propose portable pico generator designs for small scale application. Investigation on the performance of designs with varying halbach magnet shapes was mainly focused and discussed. Two designs of different magnet shape i.e. triangular and trapezoid were proposed. Open-circuit simulation and optimization results were obtained using Finite Element Method. From the results, it was found out that Trapezoid Magnet Design produced better performance and lower material cost compared to another proposed design, Triangular Magnet as well as conventional Rectangular Magnet shape.
Energy harvesting by piezoelectricity involves converting mechanical vibrations or movements into electrical energy using piezoelectric materials. These materials generate a voltage when subjected to mechanical stress, such as vibrations from ambient sources like footsteps, machinery, or environmental vibrations. In the context of energy harvesting, piezoelectric devices, often in the form of sensors or transducers, can capture and convert these mechanical vibrations into electrical energy. This technology has applications in powering small electronic devices or sensors in remote locations where traditional power sources may be impractical or unavailable, contributing to the development of self-sustainable and low-power systems.
Environmental factors such as air pollution and increase in global warming by using polluting fuels are the most important reasons of using renewable and clean energy that runs in global community. Wind energy is one of the most suitable and widely used kind of renewable energy which had been in consideration so well. This paper introduces an electric power generation
system of wind based on Y-source and improved Y-source inverter to deliver optimal electrical power to the network. This new converter is from impedance source converters family. This presented converter has more degrees of freedom to adjust voltage gain and modulation. Also, by limiting the range of simultaneous control (shooting through) while it maintains the
highest power of maximizer, it can operate in higher modulation range. This causes the reduce of stress in switching and thus it will improve the quality of output. Recommended system had been simulated in MATLAB/Simulink and shown results indicate accurate functionality.
modeling and characterization of mems electrostatic energy harvesterINFOGAIN PUBLICATION
In low-power wireless electronic devices, Energy harvesting generators have received increasing research interest in recent years. This paper describes the design and analysis of electrostatic transduction based MEMS energy harvester. Due to the benefit of a folded beam configuration that can be displace large dimensions and compliant in desired direction and stiffer in orthogonal direction. Since, large displacement of proof mass of energy harvester renders the enhance performance. Hence, the folded beam configuration of harvest has been modeled and designed and optimized the dimension of geometry. FEM simulations using COMSOL were conducted to evaluate the natural frequency and mode shape of the system and compared results with that of analytically calculated values. Spice circuit of harvester has been modeled and performed simulation to evaluate the output power of the harvester in LTSPICE. Parameter analysis was conducted to determine the optimal load and optimal output power.
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Piezoelectric effect is the effect of converting pressure into electricity. There is a specific type of material which converts the pressure/deformity in the size into electricity.
There are abundant of wave energy converter technologies available to convert wave energy into useable energy. However, most of them are huge and suitable for large application. Thus, this paper aimed to propose portable pico generator designs for small scale application. Investigation on the performance of designs with varying halbach magnet shapes was mainly focused and discussed. Two designs of different magnet shape i.e. triangular and trapezoid were proposed. Open-circuit simulation and optimization results were obtained using Finite Element Method. From the results, it was found out that Trapezoid Magnet Design produced better performance and lower material cost compared to another proposed design, Triangular Magnet as well as conventional Rectangular Magnet shape.
Energy harvesting by piezoelectricity involves converting mechanical vibrations or movements into electrical energy using piezoelectric materials. These materials generate a voltage when subjected to mechanical stress, such as vibrations from ambient sources like footsteps, machinery, or environmental vibrations. In the context of energy harvesting, piezoelectric devices, often in the form of sensors or transducers, can capture and convert these mechanical vibrations into electrical energy. This technology has applications in powering small electronic devices or sensors in remote locations where traditional power sources may be impractical or unavailable, contributing to the development of self-sustainable and low-power systems.
Environmental factors such as air pollution and increase in global warming by using polluting fuels are the most important reasons of using renewable and clean energy that runs in global community. Wind energy is one of the most suitable and widely used kind of renewable energy which had been in consideration so well. This paper introduces an electric power generation
system of wind based on Y-source and improved Y-source inverter to deliver optimal electrical power to the network. This new converter is from impedance source converters family. This presented converter has more degrees of freedom to adjust voltage gain and modulation. Also, by limiting the range of simultaneous control (shooting through) while it maintains the
highest power of maximizer, it can operate in higher modulation range. This causes the reduce of stress in switching and thus it will improve the quality of output. Recommended system had been simulated in MATLAB/Simulink and shown results indicate accurate functionality.
modeling and characterization of mems electrostatic energy harvesterINFOGAIN PUBLICATION
In low-power wireless electronic devices, Energy harvesting generators have received increasing research interest in recent years. This paper describes the design and analysis of electrostatic transduction based MEMS energy harvester. Due to the benefit of a folded beam configuration that can be displace large dimensions and compliant in desired direction and stiffer in orthogonal direction. Since, large displacement of proof mass of energy harvester renders the enhance performance. Hence, the folded beam configuration of harvest has been modeled and designed and optimized the dimension of geometry. FEM simulations using COMSOL were conducted to evaluate the natural frequency and mode shape of the system and compared results with that of analytically calculated values. Spice circuit of harvester has been modeled and performed simulation to evaluate the output power of the harvester in LTSPICE. Parameter analysis was conducted to determine the optimal load and optimal output power.
MOSFET Based High Frequency Inverter for Induction Heating Equipment Using M...ijiert bestjournal
High frequency resonant converters are used widely for induction heati ng. This paper presents a resonant inverter to achieve the desired high frequency with reduced swit ching losses and simulating the power electronic converter circuit using MATLAB/SIMULINK for inducti on heating equipment. The circuit designed has the load as induction coil and high frequency electrici ty is required to heat the work piece placed within the induction coil. The output power of the load coil is v aried by changing the frequency of the inverter. The circuit uses the Power MOSFET instead of t he IGBT.The series-resonant inverter is implemented to provide Zero Current Switching (ZCS) for all the s witches at turn off conditions and Zero Voltage Switching (ZVS) at diode turn on. The main features of the proposed inverter are simple PWM control strategy and high efficiency. The operation mode of t he inverter will be evaluated corresponding to the duty cycle of the switch.
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1. Design and optimization of MEMS
piezoelectric energy harvester
for low frequency applications
Mayank Mishra(2019UME5511)
Harsh Tyagi(2019UME5517)
Satyajit Sahoo(2019UME5536)
Rohit Kumar(2019UME5531)
2. INTRODUCTION
• Piezoelectric vibrational energy harvester (PVEH) suits best for harvesting vibrational
energy from the environment due to the simplicity in design, operation, and
compatibility with the micro electro mechanical system (MEMS) technology.
• Most of the MEMS scale piezoelectric energy harvesters reported so far is having low
output power and high resonant frequency.
• The effect of geometrical parameters on the performance of an Aluminium Nitride (AlN)
based MEMS PVEH is analyzed in detail and optimized for lower resonant frequency and
higher output power.
• Electromechanical modeling and validation are carried out for an energy harvester with
various proof mass shapes. The effect of the amount of proof mass coverage on the
performance parameters is also analyzed. Then the proposed structure is simulated and
compared to conventional energy harvesters.
3. • PVEH can be used to provide power to the Wireless Sensor Network (WSN) which
has a heavy application in the fields of agriculture, medicine, military, etc.
• Generally these WSN networks are powered by electrical batteries when the
sensor is depleted of the energy.
• Therefore, the periodical replacement of these batteries is a must for the proper
functioning of the sensors. But the replacement process is not easy as these
sensors are usually deployed in remote locations and harsh environments.
Moreover, any defects/ breakage in the packaging can result in environmental
problems.
• The lifetime of a wireless sensor network can be increased if the device can be
made independent of limited power sources such as batteries. So, in such
applications PVEH can be a very good and reliable source of energy.
4. WORKING OF PVEH
• We can produce power by utilizing ambient energy harvesting. The major
sources of ambient energy are solar, wind, radiofrequency, temperature
difference, mechanical vibration, and movement of human body parts.
• Mechanical vibrations are preferred over the others in case of micro
energy harvesting. There are mainly three types of vibrational energy
harvesters. They are electromagnetic vibrational energy harvester,
electrostatic vibrational energy harvester, and piezoelectric vibrational
energy harvester(PVEH). The major advantages of PVEH are high
electromechanical coupling, higher power density, ease of integration and
does not require any external power source.
5. CONSTRUCTION & WORKING
• Most of the Piezoelectric Energy Harvesters are based on the cantilever
structure with Lead Zirconate Titanate (PZT) as the piezo element. Due to
the simple structure and the ability to produce a relatively high average
strain for a given vibration input, the cantilever beam piezoelectric energy
harvester is widely studied and designed. The typical structure of a
cantilever-based piezoelectric energy harvester is shown.
6. • It consists of a cantilever structure, which is composed of a structural beam, a piezoelectric
layer, and electrodes. One end of the cantilever is fixed (anchor) and the other end is free to
move.
• Usually, the cantilever structure will resonate only at a particular frequency. The piezoelectric
layer with top and bottom electrodes is attached to the supporting beam.
• The proof mass at the free end helps in adjusting the resonant frequency. When an input
acceleration is applied to the structure, the mass converts the input acceleration into force.
• It will cause the bending of the beam and which in turn will result in a strain distributed along
the beam.
• The displacement of the beam causes the piezo layer to be compressed or tensed. This will
create charge accumulation due to the piezoelectric effect. The electrodes are used to tap these
charges.
• Typical materials that are used for energy harvesting are PZT(Lead Zirconate Titanate), Zinc
Oxide (ZnO), AlN(Aluminium Nitride), Barium Titanate (BaTiO3), and Poly Vinylidene Fluoride
(PVDF). Thin films and multi-layered hetero structures of piezoelectric materials are used for
MEMS applications.
7. • There are mainly two modes of operation for a piezoelectric energy
harvester depending upon the stress and polarization direction. They are
𝑑31, and 𝑑33 modes.
• In terms of power and voltage 𝑑33 mode provides better performance than
𝑑31 mode, but 𝑑31 mode provides better current. But despite its low
performance in power and voltage when compared with 𝑑33 mode, 𝑑31
mode is widely used in PVEH because of its simplicity in fabrication.
8. Design of PVEH
• The important parameters considered in this work for designing PVEH are output power and resonant
frequency. Optimization aims to achieve lower resonant frequency and higher output power.
• The resonant frequency of the device mostly depends on the device geometry. The length, width, and
thickness of the beam have a predominant effect on the resonant frequency. Ideally for the device to have
the least possible resonant frequency the device should be long, narrow and thin. But practical stability of
the device also has to be considered.
• Output power is directly proportional to mass, thus it relates the proof mass to resonant frequency of the
PVEH.
9. • Thus it comes down to two geometrical factors: Proof mass and beam design.
• Various geometries for proof mass and beam are considered.
• Harmonic analysis is conducted to determine the influence of beam geometry on
output power.
• For proof mass analysis, different shapes of proof mass are considered. The total
volume of the proof mass is kept the same for all three cases.
• Finally, whole structure is analyzed. Different combinations of proof mass and
beam designs are combined to find the best alternative.
• Effect of the amount of proof mass coverage on the output power and resonant
frequency are analyzed. Ratio of proof mass length to overall length of the
harvester is varied and the optimum coverage area is ascertained.
• The simulated model is then compared with analytical results.
• Effect of proof mass and beam design is calculated analytically and then
compared with simulation data.
• The effect of the shape of the proof mass on the resonant frequency and output
power of the energy harvester is calculated. Mathematical modelling was done
for the resonant frequency of a rectangular beam with different shapes.