How do you calculate the tractive effort of a train?

How do you calculate the tractive effort of a train?

For every ton of train weight in a grade, 20 pounds of tractive effort is needed for each 1% of slope. (One percent of a ton or 2000 pounds equals 20 pounds.) A 1% grade is defined as a vertical increase of one foot for each 100 feet of horizontal distance. A 1% grade is considered steep; a 2% grade is unusually steep.

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.

How do you calculate tractive force?

Calculate the gross tractive force developed by the wheel F using Equation 3.1.16:

1. F=μgW=0.72×10=7.2 kN. Calculate the motion resistance Fr of this wheel using Equation 3.1.17:
2. Fr=ρW=0.08×10=0.80 kN.
3. H=F−Fr=7.2−0.8=6.4 kN.
4. T=Fr=7.2×0.71=5.11 kN m.
5. PW=Tω=T2πN60=5.11×2×π×4060=21.4 kW.

Why is tractive effort needed?

Defining tractive effort Starting tractive effort: Starting tractive effort is the tractive force that can be generated at a standstill. This figure is important on railways because it determines the maximum train weight that a locomotive can set into motion.

How do you calculate HP from tractive effort?

HP by definition is equal to Tractive Effort (TE) x Speed divided by 550 lb-ft per second.

Is tractive effort a 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 are the different components of tractive effort?

The tractive effort required to overcome train resistance: The resistance of the train is mainly due to various kinds of friction. The three basic types of friction responsible for the train resistances are Coulomb friction, viscous friction and air friction.

How much weight can one train pull?

How Many Tons Is The Average Train? Train weights can range from 3,000 to 18,000 tons, depending on the load and number of cars on board. The weight of a local train can range from 1,500 to 6,000 tons, depending on whether it is used for transportation of people or for carrying less than a load.