Rolling Mechanism Based Piezoelectric Vibration Energy
Harvester
Rolling Mechanism Based Piezoelectric Vibration Energy
Harvester
PRESENTED BY
ALIANSAR P
S7 ME
ROLL NO:10
GUIDED BY RAJU C (ASST.PROFESSOR IN MECHANICAL ENGINEERING)GEC
IDUKKI
CONTENTS INTRODUCTION
ENERGY HARVESTING
ADVANTAGES OF ENERGY HARVESTING
ENERGY HARVESTING TECHNIQUES
PIEZOELECTRIC EFFECT
SOURCE OF VIBRATION
BAISIC STRUCTURE
ROLLING MECHANISM
DESIGN
TRANSMISSION PROCESS
EXPERIMENTAL SETUP
OBSERVATIONS
CONCLUTION
REFERENCE
INTRODUCTION
Energy can be harvested from environmental or mechanical
sources
Common mechanical energy is vibrational energy
There are basically three mechanism to harvest energy
Among which piezoelectric vibrational energy harvester(VEH) is
popular
ENERGY HARVESTING
WHAT IS ENERGY HARVESTING Gather energy from ambient environment
and convert it into energy.
The sources are sound, light, motion ,tide, wind, vibration
etc.
IMPORTANCE OF ENERGY HARVESTING Endless energy supply to
electronic systems
To reduce dependency on batteries
Powering wireless sensor networks and mobile electronic
product
Conserve energy consumption and promote environmental
friendliness
TYPES OF ENERGY HARVESTING MACRO ENERGY HARVESTING
MICRO ENERGY HARVESTING
Type
Energy source
solution
Ultimate goal
MACRO
Renewable source like
Wind , solar , tidal
etc.
Energy management solution
Reduce oil dependency
MICRO
Small scale source like vibration , heat , motion etc.
Ultra low power solution
Driving low energy
consuming devices
Benefits of Energy Harvesting Long lasting operability
No chemical disposal
Cost saving
Safety
Maintenance free
No charging points
Inaccessible sites operability
Flexibility
ENERGY HARVESTING TECHNIQUES
Capture.JPGElectromagnetic Harvesters
Based on Faradays law of EMI
Current induces when the magnetic flux change.
2.Electrostatic HarvestersVariation in capacitance causes either
voltage or charge increases.
Basis of electrostatic generator is the variable capacitor
The variable capacitance structure is driven by mechanical
vibrations.
3.Piezoelectric Harvesters4.Magnetostrictive Harvestersmaterials
deform when placed in a magnetic field and it can induce changes in
magnetic field when it is strained.Magnetostrictive materials are
generally used in piezoelectric-magnetostrictive
composites.PIEZOELECTRIC EFFECT
Discovered by curie brothers in 1880
It is the generation of electric field from applied force
Observed in materials with no inversion symmetry
This materials also shows the reverse piezoelectric effect
That is produce a mechanical strain from applied electric
field
MATERIALS
SOURCE OF VIBRATION
Human body
vehicles
structures
industrial
Environment
Breathing, body heat, BP
Aircraft,
Automobiles
trains
Bridge
Road
House structure
Motor
Compressor
Fan
Wind
Walking
Swimming
talking
Tires, tracks
Shock absorber
Control switches
Ducts
Cleaners
Conveyor
Cutting and dicing
Vibrating Mach
Ocean currents
Acoustic wave
PIEZOELECTRIC VIBRATION ENERGY HARVESTER
BAISIC STRUCTURE
EVOLUTION
Unimorph/biomorph cantilever Stack configurationBeam with
variable thicknessHybrid energy harvester
Cymbal harvesterMultistage force amplification mechanism based
VEH Piezoelectric multilayer stacked hybrid harvesterUnimorph
cymbal structurePiezoelectric complaint mechanism energy harvester
Rack and pinion based VEHRoller clutch based VEHRolling mechanism
based VEH
EVOLUTION cont..
.
.
ROLLING MECHANISM
Preprocessed mechanical conversion is an important stage of
VEH
It is necessary to convert oscillation to other motion.
Converts the oscillatory vibration rolling motion.
Generate high and stable rolling force
Dissipates less energy
DESIGN
PARTSOuter cylinder
Ball bushing
Inner cylinder
Piezoelectric sleeve
TRANSMISSION PROCESS
Vibration is transmitted
Ball moves back and forth
Rolling force is applied
Rolling force is transferred
Voltage generates
EXPERIMENTAL SETUP
Prototype of rolling base vibrational energy harvester
Overall view
Outer cylinder
Inner cylinder
Ball bushing
Piezoelectric unit
DETAILS OF PEIZOELECTRIC UNIT
MATERIAL : PZT-AL1 : 4 mmL2 : 6.5 mmL3 : 5 mm : 30 mm B : 8 mmTm
: 0.2 mmTp : 2 mmRadius of ball (R) : 3 mmg : 0.14 mmCapacitance :
2.56 nF
Comparison of generator voltage from simulation and
experiment
Input amplitude : 10 mmInput frequency : 2 Hz
Initial relative position hard to measure
Need more time to change direction of displacement
Narrow peak input
Manufacturing and assembly errors
Rolling time
Charge leakage issue
Discrepancy between experiment and simulation
Discrepancy between the experimental and simulation results are
due to
Generated voltage time curve
Amplitude : 10 mm Frequency : a) 1 Hzb) 2 Hzc) 3 Hz
OBSERVATIONS
Voltage density increases as vibration frequency increases
Harvest more energy under high frequency of vibration
Voltage amplitude is constant
Stable amplitude DC voltage regardless of vibration frequency
and amplitude
Generated Voltage And Power Across The Load Resistance Of 3.3 M
Input : Triangular waveAmplitude : 12.5 mmFrequency : 5 Hz
CONCLUTION
Rolling mechanism converts the reciprocating vibration to
rolling motion
Can reduce impact, magnify applied force
Increase harvested energy
Function of mechanical motion rectifier
Stable amplitude DC
REFERENCE
Hong-Xiang Zou,Wen-Ming Zhang. Ke-Xiang Wei, Wen-Bo Li,Zhi-Ke
Peng, Guang Meng, Design and Analysis of a Piezoelectric Vibration
Energy Harvester Using Rolling Mechanism by ASME OCTOBER 2016, Vol.
138 / 051007-1
A. Erturk, D. J. Inman, A Distributed Parameter
Electromechanical Model for Cantilevered Piezoelectric Energy
Harvesters by ASME AUGUST 2008, Vol. 130 / 041002-1
Stephen R. Platt, Shane Farritor, and Hani Haider On
Low-Frequency Electric Power Generation With PZT Ceramics IEEE/ASME
TRANSACTIONS ON MECHATRONICS, VOL. 10, NO. 2, APRIL 2005
A. Aboulfotoha, Mustafa H. Arafab, Said M. Megahedc A
self-tuning resonator for vibration energy harvesting 2013 Elsevier
B.V.
ANY QUERIES?
Thank You
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