Flywheel - Revision history

Jmdonev: 1 revision imported

2026-07-02T20:55:26Z

1 revision imported

← Older revision	Revision as of 20:55, 2 July 2026
(No difference)

energy>Jmdonev at 17:23, 25 June 2026

2026-06-25T17:23:41Z

← Older revision		Revision as of 17:23, 25 June 2026
Line 1:		Line 1:
	[[Category:Done ~~2018~~-05-18]]		[[Category:Done 2026-07-01]]
	[[File:Flywheel photo.jpeg\|thumbnail\|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]		[[File:Flywheel photo.jpeg\|thumbnail\|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]
	<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.		<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.
Line 30:		Line 30:

	Flywheel braking systems also have applications in ''Formula one'' racing. The system in Formula one, refereed to as [[kinetic energy recovery system]] (KERS) had a flywheel attached to each of the two drive wheels to store energy. The energy was then used to give the car a power boost of 81 hp for 6.67 seconds per lap, as controlled by the driver using a button on the steering wheel.<ref> "F1 KERS: Flybrid". Racecar Engineering. Nov 18, 2008. Retrieved Oct 29, 2013</ref>		Flywheel braking systems also have applications in ''Formula one'' racing. The system in Formula one, refereed to as [[kinetic energy recovery system]] (KERS) had a flywheel attached to each of the two drive wheels to store energy. The energy was then used to give the car a power boost of 81 hp for 6.67 seconds per lap, as controlled by the driver using a button on the steering wheel.<ref> "F1 KERS: Flybrid". Racecar Engineering. Nov 18, 2008. Retrieved Oct 29, 2013</ref>

			==For Further Reading==
			*[[Reciprocating engine]]
			*[[Rotational energy]]
			*[[Piston]]
			*[[Heat engine]]
			*Or explore a [[Special:Random\|random page]]

	==Reference==		==Reference==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

Jmdonev: 1 revision imported

2018-05-18T22:53:08Z

1 revision imported

← Older revision	Revision as of 22:53, 18 May 2018
(No difference)

Jmdonev at 21:10, 11 May 2018

2018-05-11T21:10:12Z

← Older revision		Revision as of 21:10, 11 May 2018
Line 1:		Line 1:
	[[Category:Done ~~2016~~-04-30]]		[[Category:Done 2018-05-18]]
	[[File:Flywheel photo.jpeg\|thumbnail\|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]		[[File:Flywheel photo.jpeg\|thumbnail\|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]
	<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.		<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.
Line 5:		Line 5:
	The energy stored inside of a flywheel is related to the speed of its rotation and its moment of inertia. The following equation shows the energy of a flywheel <ref>Kinetic Energy of Rotation. (n.d.). [Online] Available: http://curricula2.mit.edu/pivot/book/ph1204.html?acode=0x0200</ref>:		The energy stored inside of a flywheel is related to the speed of its rotation and its moment of inertia. The following equation shows the energy of a flywheel <ref>Kinetic Energy of Rotation. (n.d.). [Online] Available: http://curricula2.mit.edu/pivot/book/ph1204.html?acode=0x0200</ref>:

	<m> E_{rotation}=\frac{I \omega^2}{2}</m> where,		<math> E_{rotation}=\frac{I \omega^2}{2}</math> where,

	• <m> E_{rotation}</m> is the energy stored in the rotational momentum ([[Energy\|Joules]], J)		• <math> E_{rotation}</math> is the energy stored in the rotational momentum ([[Energy\|Joules]], J)

	• <m> I </m> is the object's moment of [[inertia]] (kilogram * meters<sup>2</sup>, kgm<sup>2</sup>)		• <math> I </math> is the object's moment of [[inertia]] (kilogram * meters<sup>2</sup>, kgm<sup>2</sup>)

	• <m> \omega </m> is the rotational speed (radians per second, rad/s)		• <math> \omega </math> is the rotational speed (radians per second, rad/s)


	The total stored energy in a flywheel depends on the rotational speed (ω) or the inertia (I) of the flywheel. A typical flywheel consists of a solid cylinder with radius <m>r</m> and mass <m>m</m>. The moment of inertia, <m>I</m>, of this type of flywheel is given by the equation:		The total stored energy in a flywheel depends on the rotational speed (ω) or the inertia (I) of the flywheel. A typical flywheel consists of a solid cylinder with radius <math>r</math> and mass <math>m</math>. The moment of inertia, <math>I</math>, of this type of flywheel is given by the equation:

	<m> I= \frac{mr^2}{2}</m>		<math> I= \frac{mr^2}{2}</math>


Line 25:		Line 25:
	Flywheels are often used to maintain consistent energy where the normal energy source is intermittent. For example, a flywheel can be connected to the crank shaft of a [[gasoline engine\|engine]] (assuming a manual transmission), storing rotational energy while torque is applied. When the torque is removed, the flywheel can continue to apply torque to the drive shaft, giving the engine a more consistent power output. This type of flywheel set-up was often used on old internal engines, which commonly suffered from engine knock and intermittent output. A lighter flywheel is one of the reasons that small cars can be jerky at low speeds.		Flywheels are often used to maintain consistent energy where the normal energy source is intermittent. For example, a flywheel can be connected to the crank shaft of a [[gasoline engine\|engine]] (assuming a manual transmission), storing rotational energy while torque is applied. When the torque is removed, the flywheel can continue to apply torque to the drive shaft, giving the engine a more consistent power output. This type of flywheel set-up was often used on old internal engines, which commonly suffered from engine knock and intermittent output. A lighter flywheel is one of the reasons that small cars can be jerky at low speeds.

	Another application of flywheels is to give the drive shaft a power output which is ~~over and above~~ the output of the engine alone. In motor vehicles, flywheels are used to store energy that is applied to the drive shaft during acceleration, giving the vehicle a power boost. Energy can be stored in the flywheel through [[Regenerative braking system\|regenerative braking]].		Another application of flywheels is to give the drive shaft a power output which is higher than the output of the engine alone. In motor vehicles, flywheels are used to store energy that is applied to the drive shaft during acceleration, giving the vehicle a power boost. Energy can be stored in the flywheel through [[Regenerative braking system\|regenerative braking]].

	Since flywheels become more effective with increasing size, they are more useful with larger vehicles. Large vehicles have a larger mass which minimizes the effects of gyroscopic motion. Typically, modern flywheels are found in trains, Semi-trailer trucks, and other large transport trucks.<ref>S.J.Clegg, “A review of regenerative braking systems,” Leeds, England. econ.kuleuven.be, 1996.</ref>		Since flywheels become more effective with increasing size, they are more useful with larger vehicles. Large vehicles have a larger mass which minimizes the effects of gyroscopic motion. Typically, modern flywheels are found in trains, Semi-trailer trucks, and other large transport trucks.<ref>S.J.Clegg, “A review of regenerative braking systems,” Leeds, England. econ.kuleuven.be, 1996.</ref>

	Flywheel braking systems also have applications in Formula one racing. The system in Formula one, refereed to as [[kinetic energy recovery system]] (KERS) had a flywheel attached to each of the two drive wheels to store energy. The energy was then used to give the car a power boost of 81 hp for 6.67 seconds per lap, as controlled by the driver using a button on the steering wheel.<ref> "F1 KERS: Flybrid". Racecar Engineering. Nov 18, 2008. Retrieved Oct 29, 2013</ref>		Flywheel braking systems also have applications in ''Formula one'' racing. The system in Formula one, refereed to as [[kinetic energy recovery system]] (KERS) had a flywheel attached to each of the two drive wheels to store energy. The energy was then used to give the car a power boost of 81 hp for 6.67 seconds per lap, as controlled by the driver using a button on the steering wheel.<ref> "F1 KERS: Flybrid". Racecar Engineering. Nov 18, 2008. Retrieved Oct 29, 2013</ref>

	==Reference==		==Reference==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

Jmdonev: 1 revision imported: From the summer

2016-09-17T22:29:25Z

1 revision imported: From the summer

← Older revision	Revision as of 22:29, 17 September 2016
(No difference)

Jmdonev at 16:08, 22 July 2016

2016-07-22T16:08:08Z

← Older revision		Revision as of 16:08, 22 July 2016
Line 1:		Line 1:
	[[~~category~~:Done ~~2015~~-01-15 ]]		[[Category:Done 2016-04-30]]
	[[File:Flywheel photo.jpeg\|thumbnail\|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]		[[File:Flywheel photo.jpeg\|thumbnail\|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]
	<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.		<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.

J.williams: 1 revision imported

2015-08-26T21:30:43Z

1 revision imported

← Older revision	Revision as of 21:30, 26 August 2015
(No difference)

J.williams at 22:44, 11 August 2015

2015-08-11T22:44:01Z

New page

[[category:Done 2015-01-15 ]]
[[File:Flywheel photo.jpeg|thumbnail|The image shows a flywheel typical of what would be used in machinery or motor vehicles.]]
<onlyinclude>A '''flywheel''' is a mechanical device which stores energy in the form of rotational momentum. [[Torque]] can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles.</onlyinclude> In the case of motor vehicles and other moving objects, the [[rotational inertia]] of the flywheel can have an effect due to [[gyroscopic motion]], resisting a change in the direction of the vehicle. If the [[mass]] of the flywheel is significant compared to the overall mass of the vehicle, turning and stopping the vehicle is difficult. This fact means careful design of a flywheel is required for application in moving vehicles.
== Background ==
The energy stored inside of a flywheel is related to the speed of its rotation and its moment of inertia. The following equation shows the energy of a flywheel <ref>Kinetic Energy of Rotation. (n.d.). [Online] Available: http://curricula2.mit.edu/pivot/book/ph1204.html?acode=0x0200</ref>:

<m> E_{rotation}=\frac{I \omega^2}{2}</m> where,

• <m> E_{rotation}</m> is the energy stored in the rotational momentum ([[Energy|Joules]], J)

• <m> I </m> is the object's moment of [[inertia]] (kilogram * meters<sup>2</sup>, kgm<sup>2</sup>)

• <m> \omega </m> is the rotational speed (radians per second, rad/s)

The total stored energy in a flywheel depends on the rotational speed (ω) or the inertia (I) of the flywheel. A typical flywheel consists of a solid cylinder with radius <m>r</m> and mass <m>m</m>. The moment of inertia, <m>I</m>, of this type of flywheel is given by the equation:

<m> I= \frac{mr^2}{2}</m>

To change the inertia of the flywheel, the radius or mass of the flywheel must be changed. There are clear restrictions for increases in these two properties. If the mass of the flywheel is significant compared to the overall weight of the vehicle, the gyroscopic effect will make turning the vehicle difficult. Since most flywheels will need to fit inside of another design, increasing the radius of the flywheel is restricted by the overall size of the system it is used in.

== Applications ==
[[File:Flywheel kers.jpg|thumbnail|Illustration of flywheel regenerative braking system on Volvo motor<ref>"Volvo Working on Mechanical Regenerative Braking" [Online] Available:http://www.matthewsvolvosite.com/volvo-working-on-mechanical-regenerative-braking.html</ref>]]
Flywheels are often used to maintain consistent energy where the normal energy source is intermittent. For example, a flywheel can be connected to the crank shaft of a [[gasoline engine|engine]] (assuming a manual transmission), storing rotational energy while torque is applied. When the torque is removed, the flywheel can continue to apply torque to the drive shaft, giving the engine a more consistent power output. This type of flywheel set-up was often used on old internal engines, which commonly suffered from engine knock and intermittent output. A lighter flywheel is one of the reasons that small cars can be jerky at low speeds.

Another application of flywheels is to give the drive shaft a power output which is over and above the output of the engine alone. In motor vehicles, flywheels are used to store energy that is applied to the drive shaft during acceleration, giving the vehicle a power boost. Energy can be stored in the flywheel through [[Regenerative braking system|regenerative braking]].

Since flywheels become more effective with increasing size, they are more useful with larger vehicles. Large vehicles have a larger mass which minimizes the effects of gyroscopic motion. Typically, modern flywheels are found in trains, Semi-trailer trucks, and other large transport trucks.<ref>S.J.Clegg, “A review of regenerative braking systems,” Leeds, England. econ.kuleuven.be, 1996.</ref>

Flywheel braking systems also have applications in Formula one racing. The system in Formula one, refereed to as [[kinetic energy recovery system]] (KERS) had a flywheel attached to each of the two drive wheels to store energy. The energy was then used to give the car a power boost of 81 hp for 6.67 seconds per lap, as controlled by the driver using a button on the steering wheel.<ref> "F1 KERS: Flybrid". Racecar Engineering. Nov 18, 2008. Retrieved Oct 29, 2013</ref>

==Reference==
{{reflist}}
[[Category:Uploaded]]