This document presents a rolling mechanism based piezoelectric vibration energy harvester. It begins with an introduction to energy harvesting, describing it as gathering energy from ambient sources like motion and converting it into electricity. It then discusses piezoelectric energy harvesting techniques and describes the basic structure of the rolling mechanism harvester. The harvester is designed to convert oscillating vibrations into rolling motion in order to amplify force and increase harvested energy output. Experimental results show the harvester is able to generate a stable DC voltage regardless of vibration frequency or amplitude.

1. 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

2. CONTENTS
Ø INTRODUCTION
Ø ENERGY HARVESTING
Ø ADVANTAGES OF ENERGY HARVESTING
Ø ENERGY HARVESTING TECHNIQUES
Ø PIEZOELECTRIC EFFECT
Ø SOURCE OF VIBRATION
Ø BAISIC STRUCTURE
Ø ROLLING MECHANISM
Ø DESIGN
Ø TRANSMISSION PROCESS
Ø EXPERIMENTAL SETUP
Ø OBSERVATIONS
Ø CONCLUTION
Ø REFERENCE
Ø

3. INTRODUCTION
Ø Energy can be harvested from environmental or mechanical sources
Ø Common mechanical energy is vibrational energy
Ø There are basically three mechanism to harvest energy
Ø Among which piezoelectric vibrational energy harvester(VEH) is popular
Ø

4. ENERGY HARVESTING
WHAT IS ENERGY HARVESTING
v Gather energy from ambient environment and convert it into
energy.
v The sources are sound, light, motion ,tide, wind, vibration etc.
IMPORTANCE OF ENERGY HARVESTING
v Endless energy supply to electronic systems
v To reduce dependency on batteries
v Powering wireless sensor networks and mobile electronic product

5. TYPES OF ENERGY HARVESTING
1. MACRO ENERGY HARVESTING
2. 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

6. Benefits of Energy Harvesting
Ø Long lasting operability
Ø No chemical disposal
Ø Cost saving
Ø Safety
Ø Maintenance free
Ø No charging points
Ø Inaccessible sites operability
Ø Flexibility

7. 1.
ENERGY HARVESTING TECHNIQUES

8. 1. Electromagnetic Harvesters
v Based on Faraday’s law of EMI
v Current induces when the magnetic flux change.

9. 2.Electrostatic Harvesters
v Variation in capacitance causes either voltage or charge
increases.
v Basis of electrostatic generator is the variable capacitor
v The variable capacitance structure is driven by mechanical vibrations.
3.Piezoelectric Harvesters

10. 4.Magnetostrictive Harvesters
materials 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.

11. PIEZOELECTRIC EFFECT
Ø Discovered by curie brothers in 1880
Ø It is the generation of electric field from applied force
Ø Observed in materials with no inversion symmetry
Ø This materials also shows the reverse piezoelectric effect
Ø That is produce a mechanical strain from applied electric field

13. MATERIALS

14. 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

15. PIEZOELECTRIC VIBRATION ENERGY
HARVESTER

16. BAISIC STRUCTURE

17. EVOLUTION
Unimorph/biomorph cantilever
Stack configuration
Beam with variable thickness
Hybrid energy harvesterHybrid energy harvester

18. Cymbal harvester
Multistage force amplification
mechanism based VEH
Piezoelectric multilayer –
stacked hybrid harvester
Unimorph cymbal structure
Piezoelectric complaint
mechanism energy harvester
Rack and pinion based VEH
Roller clutch based VEH
Rolling mechanism based VEH
EVOLUTION cont..

19. .
.
ROLLING MECHANISM
Ø Preprocessed mechanical conversion is an important stage of VEH
Ø It is necessary to convert oscillation to other motion.
Ø Converts the oscillatory vibration rolling motion.
Ø Generate high and stable rolling force
Ø Dissipates less energy

20. DESIGN
PARTS
1. Outer cylinder
2. Ball bushing
3. Inner cylinder
4. Piezoelectric sleeve

21. TRANSMISSION PROCESS
1. Vibration is transmitted
2. Ball moves back and forth
3. Rolling force is applied
4. Rolling force is transferred
5. Voltage generates

22. EXPERIMENTAL SETUP
Prototype of rolling base vibrational energy harvester
a) Overall view
b) Outer cylinder
c) Inner cylinder
d) Ball bushing
e) Piezoelectric unit

23. DETAILS OF PEIZOELECTRIC UNIT
MATERIAL : PZT-A
L1 : 4 mm
L2 : 6.5 mm
L3 : 5 mm
Θ : 30 mm
B : 8 mm
Tm : 0.2 mm
Tp : 2 mm
Radius of ball (R) : 3 mm
g : 0.14 mm
Capacitance : 2.56 nF

25. Comparison of generator voltage from simulation and experiment
Input amplitude : 10 mm
Input frequency : 2 Hz

26. v Initial relative position hard to measure
v Need more time to change direction of displacement
v Narrow peak input
v Manufacturing and assembly errors
v Rolling time
v Charge leakage issue
Discrepancy between experiment and simulation
Discrepancy between the experimental and simulation results are due to

27. Generated voltage –time curve
Amplitude : 10 mm
Frequency : a) 1 Hz b) 2 Hz c) 3 Hz

28. OBSERVATIONS
v Voltage density increases as vibration frequency increases
v Harvest more energy under high frequency of vibration
v Voltage amplitude is constant
v Stable amplitude DC voltage regardless of vibration frequency and amplitude

29. Generated Voltage And Power Across The Load Resistance Of 3.3 MΩ
Input : Triangular wave
Amplitude : 12.5 mm
Frequency : 5 Hz

30. CONCLUTION
Ø Rolling mechanism converts the reciprocating vibration to rolling motion
Ø Can reduce impact, magnify applied force
Ø Increase harvested energy
Ø Function of mechanical motion rectifier
Ø Stable amplitude DC

31. REFERENCE
1. 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
2. A. Erturk, D. J. Inman, “A Distributed Parameter Electromechanical Model for
Cantilevered Piezoelectric Energy Harvesters” by ASME AUGUST 2008, Vol.
130 / 041002-1
3. 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
4. A. Aboulfotoha, Mustafa H. Arafab, Said M. Megahedc” A self-tuning resonator for
vibration energy harvesting “ 2013 Elsevier B.V.
5.

32. ANY QUERIES…?

33. Thank YouThank You