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GENERATION OF
ELECTRICITY FROM
POPULOUS AREAS
USING
PIEZOELECTRICITY
Gen. Pio del Pilar National
High School
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Contents
Introduction
Methodology
Results and Discussion
Summary and Conclusion
Recommendation
Bibliography
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What is piezoelectricity?
“Piezo” -press or squeeze
“Electricity”- natural force producing light,
heat, chemical decomposition, etc
PIEZOELECTRICITY
electrical energy produced
from mechanical pressure
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Background of the Study
Developing countries such as the Philippines
are going through high energy demands
brought by its economic growth.
As a result, the country is experiencing
insufficiency in supplying these necessities.
Thus, the country is in need to find future
alternative energy sources.
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Textbook on Crystal
Physics by Voigt
(1910) became the
basis when dealing
with the complex
electromechanical
relationships in
Piezoelectric crystal.
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Recent applications of
Piezoelectricity
Piezoelectric Mats in Shibuya Station
in Tokyo, Japan
Low-powered and small scale devices
such as microphones
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No content
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Piezoelectric Crystals in Gas Ignition Systems
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Pick-ups: Phonograph &
Acoustic
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Purpose of the Study
The study aims to provide an alternative
source of energy to supply electricity to a
neighborhood community.
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Statement of the Problem
This study aims to:
Generate electricity using piezoelectric material such
as ceramic transducers.
Investigate the efficiency of the small scale prototype
of a piezoelectric mat consisting of PZT circular plates
(diaphragm) layered on top of latex rubber mat as
piezoelectric generator that will be used to provide
electrical charge for the 3W LED light bulb.
Measure (1) the mechanical stress applied (2) the
voltage, and energy.
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Significance of the Study
This study is beneficial to the country
not only in solving energy-related
problems which will lead to resolving
environmental and economic crisis.
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Cost Comparison of Electrical
Billings
Philippines U.S.A
Bill Days 30 34
Kwh Used 2507 3905
Average Kwh/day 83.5 144.9
Cost per day $16.51/ P671.44 $12.11/ P492.50
Cost per Kwh $0.20/ P8.13 $0.11/ P4.47
Total Cost of Kwh $495.37 /
P20146.04
$411.58/ P16738.41
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Methodology
Research Design
This study used the experimental method of research for
a fact that mechanical stress (tapping) on the
piezoelectric material was related to the electrical energy
induced in the prototype. The greater the number of
tapping, and the harder it is, the more energy is induced.
It real-life situation, the more mechanical stress the
people will exert on the proposed piezomat, the greater
the energy can be harnessed.
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Research Paradigm
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Figure 1. The prototype A consisted of
24 pieces PZT transducers
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Figure 2. The life size prototype B consisted
of 72 transducers
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Procedures
1
• Inducing and storing voltage
2
• Measuring the voltage
3
• Computing for the electrical
energy
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Results and Discussions
Figure 3. Voltage produced by tapping a 0.08-g PZT, the time is in deka-second
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Figure 4. Voltage produced by tapping a 0.4-g PZT, the time is in deka-second
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Table 1. Possible Voltage that can be harnessed by two
prototypes
PROTOTYPE A PROTOTYPE B
Transducer Maximum
Voltage
Transducer Maximum
Voltage
19 pcs 0.4-g PZT 19 x 7.5 V =
142.5 V
20 pcs 0.4-g PZT 20 x 7.5 V = 150
V
5 pcs 0.08 PZT 5 x 0.9 V = 4.5 V 52 pcs 0.08 PZT 52 x 0.9 V = 46.8
V
TOTAL 147 V TOTAL 196.8 V
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Electrical Energy
U = 2*Fo *ΔLo *[(3M / m) + 1] (Equation 1)
Fo = kT *ΔLo
(Equation 2)
U : the energy
Fo : the force applied on the transducer
ΔLo :the maximum nominal displacement without external force
M : the additional mass on the transducer
M : the mass of the transducer
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Table 2. Theoretically computed amounts of electrical energy
by each PZT transducer
Quantity 0.4-g PZT Transducer 0.08-g PZT Transducer
kT 0.5 N/m 0.5 N/m
ΔLo 5x10-3 m 4x10-3 m
Fo 2.5x10-3 N 2.0x10-3 N
U 5.6 J 18 J
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Table 3. Possible electrical energy that can be harnessed by
two prototypes
PROTOTYPE A PROTOTYPE B
Transducer Energy Transducer Energy
19 pcs 0.4-g PZT 19 x 5.6 J =
106.4 J
20 pcs 0.4-g PZT 52 pcs 0.08 PZT
5 pcs 0.08 PZT 5 x 18 J = 90 J 20 x 5.6 J = 112
J
52 x 18 J = 936
J
TOTAL 196.4 J TOTAL 1048 J
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Recommendations
Use other piezoelectric materials other than
PZT transducers
Improve the existing prototypes A and B
initially proposed by the researchers
Identify other contributing factors in the
production of voltage and electrical energy of
these piezoelectric materials
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Rochelle Salt
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Stack Actuator
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Cantilever Beam
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Thank you
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BIBLIOGRAPHY
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