Elimination of sound Energy Losses...it describes how the sound energy losses can be cured and converted into renewable energy.

2.  Introduction
 What Is Sound
 To Eliminate Sound Energy Losses We Should Know How It
Propagate
 Energy Loss Detection
 Sound Waves May Be Used To Generate Energy And Produce
Weapons
 Conversion Of Sound Energy To Electric Energy
A. Method I:-
B. Method II:-
C. Method III :-
 Other Application Of Sound Energy
 Merits And Demerits
 References

3. In this 21st century electric power has very deeply indulged in our
society... life without your computer , mobile , Lights , And other daily used
appliances , it is really very hard to imagine our life without these electric
appliances. Actually today, the demand of electricity is continuously
growing in this world and set to be doubled by 2030
So it is necessary to increase the supply of electric power for that
it is very essential for us to find other alternative methods to produce
electric-energy when we think of another method we think of solar
energy, wind energy, hydro energy...but we forget ...sound energy
In this century the most common thing we encountered everywhere
(roads, airports, industries...) is noise pollution
so a point comes in our mind whether is it possible to convert
sound energy to electricity??? And this waste form of sound could
be converted and used for some productive purpose, Let us see about
it........

4. It is form of Energy
It is the only way through which any creature existing in this
world can communicate with each other
It is measured in decibels & sound perceptible by humans has
frequencies from 20 Hz to 20,000 Hz
In air at standard Pressure and temperature the corresponding wave
length of sound wave ranges from 17 mm to 17 m
It can be converted into various other forms of Energies such as Heat
energy , Mechanical Energy and Electrical Energy etc

5.  There are Several Important factors which affect the
propagation of sound such as Geometric spreading,
Atmospheric effects and Surface effects
Atmospheric Effect
o Air Absorption
o Wind and Temperature Gradients
Surface Effect
o Ground Absorption
o Attenuation due to Barriers and Trees

6. I. Ultrasound
Sound with frequencies higher than those
that humans can hear is called ultrasound. When
the compressed air passes into the atmosphere it
changes from a pressurised laminar flow into a
low-pressure turbulent flow, This turbulence
creates “white noise” which contains ultrasound

7. When high-powered infrasound was directed at the subjects,
it caused internal bleeding and even destroyed body tissue
and Ultimate death of a specimen
sound is also being used more constructively - promising to
defeat noise pollution and even power engines in the future

8. It is discovered that cooling and heating gases could drive a piston,
the thermo acoustic Stirling heat engine produces sound from heated
helium within the engine, The sound waves then drive a piston which
in turn generates electricity
A machine is also invented that lifts objects and moves them by
acoustic levitation using supersonic waves which vibrate at the rate
20,000 times per second

10. In our daily use we use many products in which the
conversion between sound energy and electric energy takes place
For e.g.:- mice, speaker, mobile phone, transducers
However the amount of conversion is very small and we
require large amount of energy to convert it…so the problem is
how we could convert efficiently, As sound wave is a mechanical
wave when it travels through a medium it disturbs the particle of
the medium these disturbance created by sound could be used to
produce electricity

11. METHOD I  Suppose we create a very thin curtain like
diphagram which will get fluctuated by
the oscillation and pressure created by the
sound wave and a conductor will be
attached to it which will be placed
between magnetic bars these fluctuation
in the curtain will create a movement in
conductor which will affect the magnetic
field of the magnet which inturn will
generate motional emf and voltage across
it
 But its limitation will be that it will
be efficient only in the place where high
decibel of sound is available
 For example:- nuclear power plant,
industries using huge and noisy machines
etc.

12. As sound wave travel by oscillating the particles of the
medium so when sound energy travel through the medium
it will disturbs the particle of the medium these disturbance
created by sound will be used to convert it into heat energy
as when the particles of the medium will be pushed by the
sound wave it will collide with adjacent particle of the
medium this collision will result in production of heat
energy the production of heat energy will be more in the
denser medium
So for more heat production we will need a material with
very high density, This heat energy will be converted into
electricity

13. SOUND – HEAT – ELECTRIC
As here the conversion is to be done two times so...
This method is less efficient due to more energy losses taking place
while conversion of sound energy to heat energy and then heat energy to
electric energy then the other methods

14. METHOD III :-
Converting sound energy to electricity by
piezo electric material
(piezo electric materials are the crystal
which convert mechanical strain to
electric energy)
Piezo electric materials are transducers its
crystals could convert mechanical strain to
electricity, The crystals are formed
naturally e.g. quartz, bone
whereas artificially ZnO , lithium ,Lead
the sound energy could be converted into
electricity using piezo electric material.
Let us see the properties of piezo electric
material

15. when the crystal is mechanically strained or deformed by the
application of an external stress (here sound energy) then, electric
charges appear on the crystal surfaces;
And as the direction of the strain reverses, the polarity of the
electric charge is reversed, This is called the direct piezo electric effect,
and the crystals that exhibit it are classed as piezoelectric crystal
Inversely, when charges are applied by external means to a
piezoelectric crystal faces, the crystal exhibits strain, i.e. the
dimensions of the crystal Changes
The direct piezoelectric effect

16. So it could be seen that when the sound energy is applied to the piezoelectric
material it create strain in the crystal then it reverse it and the strain is converted into
electric energy, This direct piezo electric effect property of an piezo electric material
could be used for making the device to convert sound energy to electric energy
The inverse piezo electric effect :-.
Piezo converter (srb)
A device could be made using piezo electric material which will collect the
sound wave which are travelling near it and that sound wave will be used to cause a
strain due to pressure created by its oscillation in the piezo crystal and will create the
disturbance in its atoms resulting in the flow of electric charge on the surface of the
crystal thus sound energy could be converted into electricity as the piezo electric
material convert mechanical strain to electric energy

17. I. To Find Cracks In The Metals
III. Conversion of Sound Energy into Different Forms
II. Use in medical Field

18. Military application
Alternate source of energy
To Measure The Depth Of The Sea
In Medical Field
Way Of Communication

19. MERITS DEMERITS
If we will be able to convert sound
energy to electric energy efficiently
it could help us to reduce the
scarcity of electrical energy globally
.
The noise pollution in the road
would be able to convert into
electric energy and lights the street
lightning, signals and various other
electrical appliances.
The electricity produce in nuclear
power station could increase as the
sound produce during nuclear fission
also could be used to get more
electric energy and reduction of
CO2 as electric energy is one of the
cleanest energy.
Lots of work is to be done in this
field.
Its efficiency is not that good so
improvement is being required.
It is bit costlier. As whole setup
would be done.
It could not be used in the places
where decibel of sound is very
low.

20. As sound has enormous amount energy with it, it could be used by
converting it into electric energy for various purposes. Sound energy is a
mechanical energy so according to law of thermodynamics mechanical energy
could be converted into electric energy
Sound energy could be converted by different methods
Method 1-by creating apparatus using curtain (diphagram) magnet and
conductor
Methods 2-by converting Sound >heat energy & then heat energy>electric
energy
Method 3-by using transducers such as piezo electric material which
converts mechanical strain>electric energy and vice 4 versa
Piezo electric crystals are the crystals which converts mechanical strain to
electric energy, The strain applied to piezo electric material by sound energy
could be converted into electricity. In this aspect lot of research is to be done
but on a positive note this could surely be done which could solve the energy
problem of the entire world