Oct 18, 2015
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ME2356 DESIGN AND FABRICATION PROJECT
FOOT STEP POWER GENERATION SYSTEM FOR
RURAL APPICATIONA PROJECT REPORT
Submi tted by
PRASANTH. M (111711114104)
PRASANTH. M (111711114105)
PRASHANTH RAJU. S (111711114106)
RAGHUNANDAN. R (111711114113)
I n partial fulf il lment for the award of the degree
Of
BACHELOR OF ENGINEERING
in
MECHANICAL ENGINEERING
RMK ENGINEERING COLLEGE, KAVARAIPETTAI
ANNA UNIVERSITY::CHENNAI 600 025
APRIL 2014
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ANNA UNIVERSITY: CHENNAI 600 025
BONAFIDE CERTIFICATE
Certified that this project report DESIGN AND FABRICATION OF
FOOT STEP POWER GENERATION SYSTEM FOR RURAL
APPICATION is the bonafide work of PRASANTH.M
(111711114104), PRASANTH.M (111711114105), PRASANTH
RAJU.S (111711114106), RAGHUNANDAN.R (111711114113)
were carried out the project work under my supervision.
SIGNATURE SIGNATURE
Dr. K.R.SENTHIL KUMAR, M.E., Ph.D Mr.V.KALAISELVAM, M.E.
HEAD OF THE DEPARTMENT ASST.PROFESSOR
Dept. of Mechanical Engineering Dept. of Mechanical Engineering
RMK Engineering College RMK Engineering College
Kavaraipettai, Chennai-601 206 Kavaraipettai, Chennai-601 206
Submitted for the general vice voce held on..............at R.M.K
Engineering College, Kavaraipettai.
INTERNAL EXAMINER EXTERNAL EXAMINER
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ACKNOWLEDGEMENT
We would express our gratitude to our beloved chairman
THIRU.R.S.MUNIRATHINAMR.M.K. Engineering College, Kavaraipettai, for
having arranged to do this project.
We also would like to express our deep sense of gratitude to our beloved
principal Dr. ELWIN CHANDRA MONIEfor giving all the encouragement and
enthusiasm in the successful completion of the project work.
Our bountiful thanks to our H.O.D Dr.K.SENTHIL KUMAR M.E., PhD
Department of Mechanical Engineering, R.M.K. Engineering College, for his
concern over to fulfill our project.
We extend our hearty thanks to Mr.V.KALAISELVAM, M.E., our project
guide, for his inspiration, invaluable guidance and constant encouragement
endeavor which helped us to design this project.
Our noble thanks to all faculty members of mechanical department, system
administrator and lab technicians who rendered their hands to complete our project
with great success.
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ABSTRACT
Man has needed and used energy at an increasing rate for his sustenance and well
being ever since he came on the earth a few million years ago. Primitive man
required energy primarily in the form of food. He derived this by eating plants or
animals, which he hunted. Subsequently he discovered fire and his energy needs
increased as he started to make use of wood and other bio mass to supply the
energy needs for cooking as well as for keeping himself warm. With the passage of
time, man started to cultivate land for agriculture. He added a new dimension to
the use of energy by domesticating and training animals to work for him. With
further demand for energy, man began to use the wind for sailing ships and for
driving windmills, and the force of falling water to turn water for sailing ships and
for driving windmills, and the force of falling water to turn water wheels. Till this
time, it would not be wrong to say that the sun was supplying all the energy needs
of man either directly or indirectly and that man was using only renewable sources
of energy
Here the Gravitational force or Body weight is used to generate electricity with the
help of Rack & Pinion, Gears, Chain drive, Sprocket, PMDC Generator, Battery
and inverter. By simply stepping on the mechanism the electricity is generated with
any production of harmful gases or any other by product. It is a bio-friendly
mechanism which reduces the usage of conventional energy resources.
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Foot Step Power Generation system for rural
energy application to run AC and DC loads
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INDEX
TOPICS
CHAPTER PAGE
1. INTRODUCTION
1.1Introduction to the project 81.2 Project overview 9
2. PROJECT DESCRIPTION 10
3. HARDWARE DESCRIPTION
3.1 Foot step arrangement 11
3.2 Rack & pinion and chain sprocket arrangement 11
3.3 PMDC generator 12
3.4 Battery 15
3.5 Inverter 18
3.6 Light load 19
4. DESIGN AND CALCULATION 23
4.1 Calculation of speed of Pinion shaft
4.2 Calculation of Speed of Flywheel shaft
4.3 Calculation of Mass of Flywheel
4.4 Calculation of Stiffness of spring
4.5 Calculation of Speed of Generator shaft
5. HARDWARE COMPONENTS 26
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6. MANUFACTURING PROCESS AND ENERGY FLOW 28
7. ADVANTAGES AND APPLICATIONS 30
8. KIT PHOTO REPRESENTATION 31
Figure 8.1: Front View of the Job
Figure 8.2: Back View of the Job
Figure 8.3: Chain and Sprocket arrangement
Figure 8.4: Rack & Pinion arrangement
Figure 8.5: Flywheel and Gear arrangement
Figure 8.6: Side View of the Job
Figure 8.7: PMDC Generator
9. FINAL RESULTS AND CONCLUSION 33
. RESULTS
II. COST ESTIMATION
I.CONCLUSION
V.REFERENCE
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1. INTRODUCTION
1.1. Introduction to the projectMan has needed and used energy at an increasing rate for his sustenance and
wellbeing ever since he came on the earth a few million years ago. Primitive man
required energy primarily in the form of food. He derived this by eating plants
or animals, which he hunted. With the passage of time, man started to cultivate
land for agriculture. He added a new dimension to the use of energy by
domesticating and training animals to work for him. With further demand for
energy, man began to use the wind for sailing ships and for driving windmills, and
the force of falling water to turn water for sailing ships and for driving windmills,
and the force of falling water to turn water wheels. Till this time, it would not be
wrong to say that the sun was supplying all the energy needs of man either directly
or indirectly and that man was using only renewable sources of energy.
Other people have developed piezo-electric (mechanical-to-electrical)
surfaces in the past, but the Crowd Farm has the potential to redefine urban space
by adding a sense of fluidity and encouraging people to activate spaces with their
movement. The Crowd Farm floor is composed of standard parts that are easily
replicated but it is expensive to produce at this stage. This technology would
facilitate the future creation of new urban landscapes athletic fields with a
spectator area, music halls, theatres, nightclubs and a large gathering space for
rallies, demonstrations and celebrations, railway stations, bus stands, subways,airports etc. like capable of harnessing human locomotion for
electricity generation.
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1.2. Project overview:Proposal for the utilization of waste energy of foot power with human
locomotion is very much relevant and important for highly populated countries like
India and China where the roads, railway stations, bus stands, temples, etc. are all
over crowded and millions of people move around the clock. This whole
human/bioenergy being wasted if can be made possible for utilization it will be
great invention and crowd energy farms will be very useful energy sources in
crowded countries. Walking across a "Crowd Farm," floor, then, will be a fun for
idle people who can improve their health by exercising in such farms with earning.
The electrical energy generated at such farms will be useful for nearby
applications.
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2. PROJECT DESCRIPTION
Upper plate
Rack &PinionGenerator
Lower plate
AC ripple
neutralizer
Unidirectional
CurrentController
Rechargeable
Battery INVERTER
Light
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3. HARDWARE DESCRIPTION
3.1 Foot step arrangement
WORKING OF FOOT STEP GENERATOR:
Step1: When force is applied on the plate by virtue on stamping on the plate the
force spring gets compressed
Step2: The rack here moves vertically down
Step3: The pinion meshed with the rack gear results in circular motion of the
pinion gear
Step4: For one full compression the pinion Moves 1semicircle
Step5: When the force applied on the plate released the pinion reverses and moves
another semi-circle
Step6: The generator attached to the pinion hence results in the sinusoidal
waveform (for single Generator)
3.2 Rack And Pinion and chain sprocket arrangement
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3.3. PMDC Generator
Fig 2.1 PMDC GENERATOR
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Generator Construction:
Simple loop generator is having a single-turn rectangular copper coil rotating about
its own axis in a magnetic field provided by either permanent magnet or electro
magnets. In case of without commutator the two ends of the coil are joined to slip
rings which are insulated from each other and from the central shaft. Two
collecting brushes (of carbon or copper) press against the slip rings. Their function
is to collect the current induced in the coil. In this case the current waveform we
obtain is alternating current. In case of with commutator the slip rings are replaced
by split rings. In this case the current is unidirectional.
Components of a generator:
Rotor:In its simplest form, the rotor consists of a single loop of wire made to
rotate within a magnetic field. In practice, the rotor usually consists of several coils
of wire wound on an armature.
Armature:The armature is a cylinder of laminated iron mounted on an axle. Theaxle is carried in bearings mounted in the external structure of the generator.
Torque is applied to the axle to make the rotor spin.
Coil:Each coil usually consists of many turns of copper wire wound on the
armature. The two ends of each coil are connected either to two slip rings (AC) or
two opposite bars of a split-ring commutator (DC).
Stator: The stator is the fixed part of the generator that supplies the magnetic field
in which the coils rotate. It may consist of two permanent magnets with opposite
poles facing and shaped to fit around the rotor. Alternatively, the magnetic field
may be provided by two electromagnets.
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Field electromagnets: Each electromagnet consists of a coil of many turns of
copper wire wound on a soft iron core. The electromagnets are wound, mounted
and shaped in such a way that opposite poles face each other and wrap around the
rotor.
Brushes: The brushes are carbon blocks that maintain contact with the ends of the
coils via the slip rings (AC) or the split-ring commutator (DC), and conduct
electric current from the coils to the external circuit.
Working:
The commutator rotates with the loop of wire just as the slip rings do with
the rotor of an AC generator. Each half of the commutator ring is called a
commutator segment and is insulated from the other half. Each end of the rotating
loop of wire is connected to a commutator segment. Two carbon brushes connected
to the outside circuit rest against the rotating commutator. One brush conducts the
current out of the generator, and the other brush feeds it in. The commutator is
designed so that, no matter how the current in the loop alternates, the commutator
segment containing the outward-going current is always against the "out" brush at
the proper time. The armature in a large DC generator has many coils of wire and
commutator segments. Because of the commutator, engineers have found it
necessary to have the armature serve as the rotor(the rotating part of an apparatus)
and the field structure as the stator (a stationary portion enclosing rotating parts)
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Fig 2.2 12V DC GENERATOR
3.4. Battery
RECHARGEBLE BATTERIES:
A rechargeablebattery or storage battery is a group of one or
moreelectrochemical cells. They are known as secondary cells because
their electrochemical reactions are electrically reversible. Rechargeable batteries
come in many different shapes and sizes, ranging anything from abutton cell to
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megawatt systems connected tostabilize an electrical distribution network.
Fig 2.22: Rechargeable Batteries
Rechargeable batteries have lower total cost of use and environmental
impact than disposable batteries. Some rechargeable battery types are available in
the samesizes as disposable types. Rechargeable batteries have higher initial cost,
but can be recharged very cheaply and used many times.
Rechargeable batteries are used forautomobile starters, portable
consumer devices, light vehicles (such asmotorized wheelchairs,golf
carts,electric bicycles, and electricforklifts), tools, anduninterruptible power
supplies.Emerging applications inhybrid electric vehicles andelectric vehicles are
driving the technology to reduce cost and weight and increase lifetime. Normally,
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new rechargeable batteries have to be charged before use; newerlow self-discharge
batteries hold their charge for many months, and are supplied charged to about
70% of their rated capacity.
Grid energy storage applications use rechargeable batteries for load leveling, where
they store electric energy for use during peak load periods, and for renewable uses,
such as storing power generated fromphotovoltaic arrays during the day to be used
at night. By charging batteries during periods of low demand and returning energy
to the grid during periods of high electrical demand, load-leveling helps eliminate
the need for expensivepeaking power plants and helpsamortize the cost of
generators over more hours of operation.
The USNational Electrical Manufacturers Association has estimated
that U.S. demand for rechargeable batteries is growing twice as fast as demand for
non -rechargeable.
3.5. Inverter
An inverter is an electrical device that convertsdirect current (DC)
toalternating current (AC); the converted AC can be at any required voltage and
frequency with the use of appropriatetransformers,switching, and control circuits.
Solid-state inverters have no moving parts and are used in a wide range of
applications, from smallswitching power supplies in computers, to largeelectric
utilityhigh-voltage direct current applications that transport bulk power. Inverters
are commonly used to supply AC power from DC sources such assolar
panels orbatteries.
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Fig 2.26: Inverter
There are two main types of inverter. The output of a modified sine
wave inverter is similar to asquare wave output except that the output goes to zero
volts for a time before switching positive or negative. It is simple and low cost
(~$0.10USD/Watt) and is compatible with most electronic devices, except for
sensitive or specialized equipment, for example certainlaser printers.A pure sine
wave inverter produces a nearly perfect sine wave output (
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3.6. Light Loads
Fig 2.27 COMMERCIAL BULB
A bulb is a short stem with fleshy leaves or leaf bases. The leaves often
function as food storage organs during dormancy .
A bulb's leaf bases generally do not support leaves, but contain food reserves
to enable the plant to survive adverse conditions. The leaf bases may resemble
scales, or they may overlap and surround the center of the bulb as with the onion.
A modified stem forms the base of the bulb, and plant growth occurs from
this basal plate. Roots emerge from the underside of the base, and new stems and
leaves from the upper side.
Other types of storage organs (such as corms, rhizomes, and tubers) are
sometimes erroneously referred to as bulbs. The correct term for plants that form
0underground storage organs, including bulbs as well as tubers and corms,
is geophytes. Some epiphytic orchids (family Orchidaceous) form above-ground
storage organs called pseudo bulbsthat superficially resemble bulbs.
Incandescent
These are the standard bulbs that most people are familiar with.
Incandescent bulbs work by using electricity to heat a tungsten filament in the bulb
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until it glows. The filament is either in a vacuum or in a mixture of argon/nitrogen
gas. Most of the energy consumed by the bulb is given off as heat, causing its
Lumens per Watt performance to be low. Because of the filament's high
temperature, the tungsten tends to evaporate and collect on the sides of the bulb.
The inherent imperfections in the filament causes it to become thinner unevenly.
When a bulb is turned on, the sudden surge of energy can cause the thin areas to
heat up much faster than the rest of the filament, which in turn causes the filament
to break and the bulb to burn out.
Incandescent bulbs produce a steady warm, light that is good for most household
applications. A standard incandescent bulb can last for 700-1000 hours, and can beused with a dimmer. Soft white bulbs use a special coating inside the glass bulb to
better diffuse the light; but the light color is not changed.
Halogen
Halogen bulbs are a variation of incandescent bulb technology. These bulbs
work by passing electricity through a tungsten filament, which is enclosed in a tube
containing halogen gas. This halogen gas causes a chemical reaction to take place
which removes the tungsten from the wall of the glass and deposits it back onto the
filament. This extends the life of the bulb. In order for the chemical reaction to take
place, the filament needs to be hotter than what is needed for incandescent bulbs.
The good news is that a hotter filament produces a brilliant white light and is more
efficient (more lumens per watt).
The bad news is that a hotter filament means that the tungsten is evaporating
that much faster. Therefore a denser, more expensive fill gas (krypton), and a
higher pressure, are used to slow down the evaporation. This means that a thicker,
but smaller glass bulb (envelope) is needed, which translates to a higher cost. Due
to the smaller glass envelope (bulb), the halogen bulb gets much hotter than other
bulbs. A 300 watt bulb can reach over 300 degrees C. Therefore attention must be
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paid to where halogen bulbs are used, so that they don't accidentally come in
contact with flammable materials, or burn those passing by.
Care must be taken not to touch the glass part of the bulb with our fingers.
The oils from our fingers will weaken the glass and shorten the bulbs life. Many
times this causes the bulb to burst when the filament finally burns out.
To summarize, the halogen has the advantage of being more efficient
(although not by much) and having longer life than the incandescent bulb. They are
relatively small in size and are dimmable. The disadvantages are that they are more
expensive, and burn at a much higher temperature, which could possibly be a firehazard in certain areas.
Fluorescent
These bulbs work by passing a current through a tube filled with argon gas
and mercury. This produces ultraviolet radiation that bombards the phosphorous
coating causing it to emit light (see: How Fluorescents Work). Bulb life is very
long - 10,000 to 20,000 hours. Fluorescent bulbs are also very efficient, producing
very little heat. A common misconception is that all fluorescent lamps are neutral
or cool in color appearance and do not have very good color-rendering ability. This
is largely due to the fact that historically the "cool white" fluorescent lamp was the
industry standard. It had a very cool color appearance (4200K) and poor CRI
rating. This is simply no longer the case. Regarding color, a wide variety of
fluorescent lamps , using rare-earth tri-phosphor technology, offer superior colorrendition and a wide range of color temperature choices (from 2700K to 5000K
and higher). Fluorescent bulbs are ideal for lighting large areas where little detail
work will be done (e.g. basements, storage lockers, etc.). With the new type bulbs,
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and style of fixtures coming out, fluorescents can be used in most places around
the home. Most fluorescent bulb cannot be used with dimmers.
That fluorescent bulb need components called ballasts to provide the right
amount of voltage. There are primarily two types - magnetic and electronic.
Electronic ballasts solve some of the flickering and humming problems associated
with magnetic ballast, and are more efficient, but cost more to purchase. Some
ballasts need a starter to work along with it. Starters are sort of small mechanical
timers, needed to cause a stream of electrons to flow across the tube and ionize the
mercury vapor
On tube type fluorescent bulbs, the letter T designates that the bulb is tubularin shape. The number after it expresses the diameter of the bulb in eighths of an
inch.
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4. DESIGN CALCULATION
4.1Calculation of speed of the Pinion shaft (N1)Length of the Rack = 375 mm
Pinion outer diameter = 88 mm
First we have to calculate the angular velocity for the linear movement of the Rack
using the formulae
To calculate the angle the following formulae is used
Length of the Arc is the Linear distance covered by the Rack = 120 mm
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The circumference of the Pinion = 2r = 276.46 mm
So = 15615
Time taken for the linear movement is 1 sec
By using the formulae the angular velocity () is 2.72 rad/sec
V1= x r
V1= 119.68 mm/sec
From the above equation we can calculate linear velocity and by using it we can
calculate speed of the pinion shaft.
V1= dN1/60
Where
d is the shaft diameter = 20 mm
N1 is the speed of the Pinion shaft
From the above equation N1 = 114.28 rpm
4.2Calculation of Speed of Flywheel shaft (N2)Speed ratio is taken as 2
N2/N1= 2
Speed of the Lower shaft N2= 228.57 rpm
Velocity (v2) of lower shaft = 239.35 mm/sec
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4.3Calculation of Mass of Flywheel (M)Now we have to calculate the mass of the Flywheel
The formulae used to calculate the mass of the Flywheel is
Kinetic Energy = Work Done
Work Done = Weight of the person x Displacement
Work Done = 176580 N mm
From the above equation we can calculate the mass of the flywheel
Mass of the Flywheel (M) = 1.23 Kg
4.4Calculation of Stiffness of spring (K)Load is equally distributed at the ends.
W = W1+ W2= K1 + K2
W1= 75 Kg, W2= 75 Kg
= 120 mm
K1= K2= 6.13 N/mm
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4.5Calculation of Speed of Generator shaft (N3)Gear ratio = 2.2
N3Speed of Generator shaft
N3/N2= 2.2
N3= 228.57 x 2.2 = 502.85 rpm
5. HARDWARE COMPONENTS
Hardware components for Foot step power generator
1. Spring Free length150 mm Mean Diameter40 mm Wire Diameter2 mm Pitch12 mm
2. Rack Length of the Rack375 mm Pitch of the Rack6 mm
3. Pinion Pitch of Pinion6 mm O/D of pinion88 mm Bore Diameter20 mm Teeth40
4. BearingDouble sealed Ball Bearing Inner Diameter20 mm Outer Diameter50 mm
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5. Sprocket Outer Diameter80 mm Inner Diameter20 mm Teeth18 Pitch15 mm
6. Chain Roller Diameter10 mm Pin Diameter3 mm Pitch15 mm Between Inner Plates10 mm
7. Gear Wheel Pitch6 mm Outer Diameter88 mm Bore Diameter20 mm Teeth40
8. Battery 12 v
9. Fly Wheel Outer Diameter140 mm Inner Diameter20 mm Thickness8 mm
Mass0.966 kg10.P.M.D.C Generator
12 volt permanent magnet generator 6000 rpm produce 12 volt
11.Shaft
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Diameter20 mm Length500 mm
6. MANUFACTURING PROCESS AND
ENERGY FLOW
Manufacturing Process of Foot Step Generator
Design and Selection of material Purchase of raw material Raw material sent to Factory for machining it to required dimension Marking and cutting Sent to lathe shop for the required hole diameter of pinion, flywheel, Free
wheel and gear
Marking and drilling of holes at the required points Fixing of Free Wheel, Flywheel, Pinion, Gear to the shaft Fixing of bearing to bearing housing and attaching it to the vertical frame Fixing of shaft to the bearing housing Rack & Pinion fixed to the Shaft and Frame Mounting of PMDC Generator to the frame with 2 sealed ball bearing PMDC Generator is mounted on a base and connected to the small gear Top frame is supported by 4 springs (2 on each side) with a inch bolt for
vertical support
Finally the whole setup is welded for more strength and grinding is done forgood surface finish
Paint job is done at the final stage for good look
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ENERGY FLOW OF FOOT STEP GENERATOR
Gravitational force or
Body force
Linear movement of
rack which rotates the
Pinion
Rotation of shaft which in tu
rotates Free wheel
Transmission of rotation to lower shaft
by chain drive to smaller SprocketRotation of gear which in turn
rotates the Generator gear shaft
Electricity is produced
by the generator due to
the rotation
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7. ADVANTAGES AND APPLICATIONS
Advantages
Reliable Economical Eco-Friendly Less consumption of Non- renewable energies.
Applications
Foot step generated power can be used for agricultural, home applications,street-1lightening.
Foot step power generation can be used in emergency power failuresituations.
Metros, Rural Applications etc.,
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8. KIT PHOTO REPRESENTATION
Fig 8.1
Fig 8.2
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Fig 8.3 Fig 8.4
Fig 8.5 Fig 8.6
Fig 8.7
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9. FINAL RESULTS AND CONCLUSION
I. RESULTSTableReadings taken for different loads using multimeter
S.NO WEIGHT IN KG VOLTAGE PRODUCED IN VOLT
1 60 3.1
2 65 3.6
3 70 4.1
4 75 4.6
5 80 5.1
6 85 5.6
7 90 6.1
From the above table we can infer that the voltage produced by the PMDC
generator varies according to the weight of the person stepping on it. So voltage is
directly proportional to the weight of the person. More the weight of the person
more the amount of voltage produced. More voltage can be produce by increasing
the transmission ratio and gear ratio.
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II. COST ESTIMATIONDESCRIPTION AMOUNT IN RS.
Rack & Pinion, gears,
Bearings
900
Springs 200
Free Wheel & Bush 93
Raw materials 1200
Machining Cost 750
Paint job 95
Fabrication Cost 800
Over all transport 200
Miscellaneous items 210
Total Cost 4448
III. CONCLUSIONThe project FOOT STEP POWER GENERATION FOR RURAL
ENERGY APPLICATION TO RUN A.C. AND D.C. LOADS is successfully
tested and implemented which is the best economical, affordable energy solution to
common people. This can be used for many applications in rural areas where
power availability is less or totally absence. As India is a developing country
where energy management is a big challenge for huge population. By using this
project we can drive both AC as well as D.C loads according to the force.
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IV. REFERENCEo www.howstuffworks.como www.answers.com
Books referred:
o EMBEDDED SYSTEM BY RAJ KAMALo Magazines:
Electronics for you
Electrik india
www.techno-preneur.net results www.telegraph.co.uk/.../energy/.../Japan-harnesses-energy-
from-foot.