A flywheel is a rotating mechanical device that is used to store rotational energy. It serves as an energy reservoir, storing energy during periods where energy production exceeds energy demand, and releasing stored energy by applying torque when demand is higher than production. Flywheels reduce fluctuations in rotational speed by absorbing and releasing energy. They are commonly used in engines and machines to maintain a constant angular velocity of rotating components. Modern high-energy flywheels use composite materials to achieve very high rotational speeds while storing significant amounts of energy.
Hydraulic Breaking System Project Presentation by Sushant Patil.
Introduction to Hydraulic Breaking System ,
Why we need Hydraulic Breaking System? ,
Principal of working of Hydraulic Breaking System,
Working of Hydraulic Breaking System ,
Applications of Hydraulic Breaking System,
Advantages of Hydraulic Breaking System,
Disadvantages Hydraulic Breaking System,
Applications of Hydraulic Breaking System,
Conclusion
Pascals Law,
Hydraulic Breaking System Project Report & Presentation
Hydraulic Breaking System Project Presentation by Sushant Patil.
Introduction to Hydraulic Breaking System ,
Why we need Hydraulic Breaking System? ,
Principal of working of Hydraulic Breaking System,
Working of Hydraulic Breaking System ,
Applications of Hydraulic Breaking System,
Advantages of Hydraulic Breaking System,
Disadvantages Hydraulic Breaking System,
Applications of Hydraulic Breaking System,
Conclusion
Pascals Law,
Hydraulic Breaking System Project Report & Presentation
Propeller shaft is a circular shaft which is used to transmit the power or rotational motion from the gear box to the final drive.
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Unit 4- balancing of rotating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
in this presentation , the different engine inefficiencies has been discussed including all sort of friction losses which affects the brake power of the engine. It includes volumetric efficiency, thermal efficiency, IMEP, BMEP, brake power etc.
A flywheel, in essence is a mechanical battery - simply a mass rotating about an axis.Flywheels store energy mechanically in the form of kinetic energy.They take an electrical input to accelerate the rotor up to speed by using the built-in motor, and return the electrical energy by using this same motor as a generator.Flywheels are one of the most promising technologies for replacing conventional lead acid batteries as energy storage systems.
Propeller shaft is a circular shaft which is used to transmit the power or rotational motion from the gear box to the final drive.
The propeller shaft as the name suggest “ propels the vehicle.
Unit 4- balancing of rotating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
in this presentation , the different engine inefficiencies has been discussed including all sort of friction losses which affects the brake power of the engine. It includes volumetric efficiency, thermal efficiency, IMEP, BMEP, brake power etc.
A flywheel, in essence is a mechanical battery - simply a mass rotating about an axis.Flywheels store energy mechanically in the form of kinetic energy.They take an electrical input to accelerate the rotor up to speed by using the built-in motor, and return the electrical energy by using this same motor as a generator.Flywheels are one of the most promising technologies for replacing conventional lead acid batteries as energy storage systems.
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Presentation given by Mike Hebbes, ANSYS Regional Technical Manager
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Liquid : blood, i.v. infusions)
Gas : O2 , N2O)
Vapour (transition from liquid to gas) : N2O (under compression in cylinder), volatile inhalational agents (halothane, isoflurane, etc)
Sublimate (transition from solid to gas bypassing liquid state) : Dry ice (solid CO2), iodine
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Things to remember while upgrading the brakes of your carjennifermiller8137
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Comprehensive program for Agricultural Finance, the Automotive Sector, and Empowerment . We will define the full scope and provide a detailed two-week plan for identifying strategic partners in each area within Limpopo, including target areas.:
1. Agricultural : Supporting Primary and Secondary Agriculture
• Scope: Provide support solutions to enhance agricultural productivity and sustainability.
• Target Areas: Polokwane, Tzaneen, Thohoyandou, Makhado, and Giyani.
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• Scope: Develop collaborations with automotive service providers to improve service quality and business operations.
• Target Areas: Polokwane, Lephalale, Mokopane, Phalaborwa, and Bela-Bela.
3. Empowerment : Focusing on Women Empowerment
• Scope: Provide business support support and training to women-owned businesses, promoting economic inclusion.
• Target Areas: Polokwane, Thohoyandou, Musina, Burgersfort, and Louis Trichardt.
We will also prioritize Industrial Economic Zone areas and their priorities.
Sign up on https://profilesmes.online/welcome/
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3. Sectors : Agriculture ( primary and secondary) and Automative
Women and Youth are encouraged to apply even if you don't fall in those sectors.
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In this presentation, we have discussed a very important feature of BMW X5 cars… the Comfort Access. Things that can significantly limit its functionality. And things that you can try to restore the functionality of such a convenient feature of your vehicle.
2. Flywheel
A rotating mechanical device that is used to store rotational
energy.
A flywheel is used in machines , serves as a reservoir which
stores energy during the period where the supply of energy is
more than the requirement.
Conversely, a flywheel releases stored energy by applying
torque to a mechanical load, thereby decreasing the flywheel's
rotational speed.
3. Flywheel
In other words it can be defined as “it stores energy during
power stroke and delivers during idle strokes”.
A little considerations will show that when the flywheel
absorbs energy, its speed increases and when it releases, the
speed decreases. Hence a flywheel does not maintain a constant
speed, it simply reduces the fluctuation of speed.
The flywheel’s position is between the engine and clutch patch
to the starter.
5. A Flywheel is used to maintain constant angular velocity
of the crankshaft in a reciprocating engine. In this case,
the flywheel—which is mounted on the crankshaft—
stores energy when torque is exerted on it by a
firing piston and it releases energy to its mechanical loads
when no piston is exerting torque on it.
6. Energy stored in a flywheel
Rotational Kinetic Energy, E = ½ Iω2
where,
I - moment of inertia of the flywheel (ability of an
object to resist changes in its rotational velocity)
ω - rotational velocity (Rad / sec)
The moment of inertia, I = kMr 2
where,
M - mass of the flywheel
r - radius of flywheel
k - inertial constant.
7. k depends on the shape of the rotating object. Shape-factor K for
different planar stress geometries
So for a solid disk ; I = Mr 2 /2
8. Co efficient of fluctuation of speed ( Cs )
The difference between the max and min speeds during a cycle is
called the max fluctuation of speed.
The ratio of the max fluctuation of speed to the mean speed is
called coefficient of fluctuation of speed.
Cs = (N1- N2 )/N
= 2( N1-N2 ) / N1 + N2
where N1 = max speed in r.p.m.
N2 = min speed in r.p.m.
N = mean speed in r.p.m.
= (N1 + N2) / 2
9. Permissible values for CS
S.NO Types of machines Coefficient of fluctuation
of speed ( CS )
1 Engines with belt transmission 0.030
2 Gear wheel transmission 0.020
3 Crushing machines 0.200
4 Electrical machines 0.003
5 Hammering machines 0.200
6 Pumping machines 0.03-0.05
7 Machine tools 0.030
10. Stresses in a flywheel rim
A flywheel consists of a rim at which the major portion of the
mass or weight of flywheel is concentrated, a boss or hub for
fixing the flywheel on to shaft and a number of arms for
supporting the rim on the hub.
The following stresses are induced in the rim.
Tensile stress due to centrifugal force.
Tensile bending stress caused by the restraint of the arms.
11. 1. Tensile stress due to the centrifugal force.
The tensile stress in the rim due to the centrifugal force, assuming
that the rim is unstrained by the arms, is determined in the similar
way as the thin cylinder subjected to internal pressure.
ft = ρ.R2.ω2 = ρ.v2 ( v = R.ω )
When ρ is in kg/m3, v is in m/sec, ft will be in N/m2
where ρ = density of the flywheel material
ω = angular speed of the flywheel
R = mean radius of the flywheel
v = linear velocity of the flywheel
12. 2.Tensile bending stress caused by restraint of arms.
The tensile bending stress in the rim due to the restraint of arms is
based on the assumption that each portion of the rim between a
pair of arms behaves like a beam fixed at both ends and
uniformly loaded, such that length between fixed ends,
L = π.D/n = 2.π.R / n
where n - number of arms
13. The max bending moment,
M = w.l2 /12 = b.t.ρ.ω2.R/12(2.π.R/n)
Section modulus, Z = 1/6 (b.t2)
So bending stress fb = M/Z = b.t.ρ.ω2.R/12 (2.π.R/n) *
6 / (b.t2)
Total stress in the rim
f = ft + fb
14. Stresses in flywheel arms
The following stresses are induced in the arms of the
flywheel.
Tensile stresses due to centrifugal force acting on the
rim
Bending stress due to the torque transmitted from the
rim to the shaft or from the shaft to the rim.
15. Construction of Flywheel
Flywheels are typically made of steel and rotate on
conventional bearings; these are generally limited to a
revolution rate of a few thousand RPM
The flywheel of smaller size( upto 600 mm dia )are casted in
one piece. The rim and the hub are joined together by means of
web.
16.
17. Construction
If flywheel is of larger size (upto 2-5 meters diameter ), then it
is made of arms.
The number of arms depends upon the size of the flywheel and
its speed of rotation. But the flywheels above 2-5 meters are
usually casted in two pieces. Such a flywheel is known as “
split flywheel “.
A split flywheel has the advantage of relieving the shrinkage
stresses in the arms due to unequal rates of cooling of casting.
18. Applications
Providing continuous energy when the energy source is
discontinuous. For example, flywheels are used in
reciprocating engines because the energy source, torque from
the engine, is intermittent.
Delivering energy at rates beyond the ability of a continuous
energy source. This is achieved by collecting energy in the
flywheel over time and then releasing the energy quickly, at
rates that exceed the abilities of the energy source.
Dynamic balancing of rotating elements.
Energy storage in small scale electricity generator sets
20. Advance and Modern Flywheel
Flywheels have also been proposed as a power booster for
electric vehicles. Speeds of 100,000 rpm have been used to
achieve very high power densities.
Modern high energy flywheels use composite rotors made with
carbon-fibre materials. The rotors have a very high strength-to-
density ratio, and rotate at speeds up to 100,000 rpm. in a
vacuum chamber to minimize aerodynamic losses.
21. Benefits in Aerospace
Flywheels are preferred over conventional batteries in many
aerospace applications because of the following benefits:
5 to 10+ times greater specific energy
Lower mass / kW output
Long life. Unaffected by number of charge / discharge
cycles
85-95% round trip efficiency
Fewer regulators / controls needed
Greater peak load capability
Reduced maintenance / life cycle costs
22. Disadvantages
There are safety concerns associated with flywheels due to
their high speed rotor and the possibility of it breaking
loose & releasing all of it's energy in an uncontrolled
manner.
Its Bulkier, adds more weight to the vehicle.
23. Conclusion
Recent advances in the mechanical properties of composites
has regained the interest in using the inertia of a spinning wheel
to store energy.
Carbon-composite flywheel batteries have recently been
manufactured and are proving to be viable in real-world tests
on mainstream cars. Additionally, their disposal is more eco-
friendly.