For an electric locomotive or a diesel-electric locomotive, starting tractive effort can be calculated from the amount of weight on the driving wheels (which may be less than the total locomotive weight in some cases), combined stall torque of the traction motors, the gear ratio between the traction motors and axles,
How do you calculate tractive effort?
For the cars in the curve, the tractive effort required is 0.8 pounds per ton per degree of curvature, where curvature is defined as the number of degrees the track curves per 100 feet. Degree of curvature can be calculated if the curve radius is known by dividing 5730 feet by the radius.
What is tractive effort of train?
Definition of tractive effort
: the force in pounds exerted by powered equipment (as a locomotive) as measured for statistical purposes at the rim of the driving wheels.
Is tractive effort the same as torque?
The tractive effort is obtained by multiplying the torque by the total ratio of power train and dividing this sum by the rolling radius of the driving tyres. r = Rolling radius of loaded driving tyre in inches.
What is railway tractive resistance?
The resistance to motion due to friction per unit weight hauled.
How do you calculate the tractive effort of a steam locomotive?
Tmin = Pc * ( C / 2 ) 2 * Pi * S / D (Formula 4) where: Tmin = Tractive force minimum in pounds. Pc = Steam pressure in cylinder in pounds per square inch gage. C = Cylinder bore diameter or piston diameter in inches.
What is the difference between traction and tractive effort?
The force available at the contact between the drive wheel tyres and road is known as ‘tractive effort’. The ability of the drive wheels to transmit this effort without slipping is known as ‘traction’.
What is tractive effort and tractive resistance in which condition both are equal?
Maximum road speed: When tractive effort TE is equal to the tractive resistance TR a vehicle would be either stationary or moving at a uniform velocity.
What is meant by tractive force?
Traction, or tractive force, is the force used to generate motion between a body and a tangential surface, through the use of dry friction, though the use of shear force of the surface is also commonly used.
What does the word tractive mean?
Definition of tractive
1 : serving to draw. 2 : of or relating to traction : tractional.
What do you understand by hauling capacity and tractive effort?
Primarily tractive effort of the locomotive determines the load hauling capacity. It is the combined adhesive force developed by the locomotive by the locomotive wheels on the rails. The tractive effort transforms into drawbar pull after accounting for the locomotive resistance, and pulls the trailing load.
What is tractive effort in a steam locomotive?
Tractive Effort is a measure of the force that a locomotive can apply to the train it is pulling. For steam locomotives, Tractive Effort was usually the limitting factor in the size of the train it could pull. Therefore, Tractive Effort was more important than HorsePower for steam locomotives.
What is variation of tractive force?
Variation in tractive force: A variation in the tractive force (effort) of an engine is caused by the unbalanced portion of the primary force which acts along the line of stroke of a locomotive engine.
Which factors limit the maximum tractive effort in vehicles?
It is peak shear force divided by the imposed vertical force. The limiting friction of the tyre determines the maximum tractive force that the tyre can produce, and is entirely independent of the rolling resistance.
How do you convert tractive effort to horsepower?
HP by definition is equal to Tractive Effort (TE) x Speed divided by 550 lb-ft per second.
What is critical tractive force?
The permissible tractive force is the maximum shear stress that will not cause erosion of the material forming the channel bed on a level surface. The value, obtained from laboratory experiments, is called the critical tractive force.
What does tract mean in anatomy?
1a : a system of body parts or organs that act together to perform some function the digestive tract. b : a bundle of nerve fibers having a common origin, termination, and function.
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