For the remainder of this article references to a steam locomotive shall be understood to be an ordinary two cylinder, reciprocating double acting, single expansion, non condensing, adhesion or friction traction, side rod driven steam. Gps tracking on smartphone for your pet directly from the manufacturer no. So if we look at an ac6000 compared to an ac4400, assuming the weight, traction motors and gear ratio are all the same, they are likely to haul the same load over a given. With this in mind, there are two places we can get tractive effort. These terms apply to different operating conditions, but are related by common mechanical factors. Tractive effort, curving and surface damage of rails. Horsepower and tractive effort the idiots guide to. Importance of tractive effort lies with its capability to start a train on the gradient and run it up to a speed of around 30 kmph whereas that of horse power is its ability to achieve and run at the maximum permissible speed. Force of vehicles engine maximum value transferable maximum tractive effort define the point at which additional enginegenerated tractive effort is not productive. The continuous tractive effort would be determined by how much electricity traction motors could handle before burning up. If a cross over the tractive effort curve would appear for the next gear by remaining in gear until maximum rpm, then a small, roughly triangular shaped section would be cut out of the available area every time when gear is changed. The total axle torque is tractive effort times the wheel radius. Utilization of electrical energy pdf notes uee pdf notes unit i electric drives.
Tractive effort and acceleration ce 322 transportation engineering dr. For slopes, you will need an additional 100 newton per percent of steepness. The propelling force developed is generally referred to as tractive force or tractive effort. May 12, 20 tractive effort, when multiplied with speed at which the train is required to run, gives the horsepower. If a cross over the tractive effort curve woul d appear for the next gear by. Tractive effort is defined as the force at the rims or the outer edges of the driving wheels of moving trains.
The speed at which both forces are equal is the maximum speed the train can get to on a flat piece of track. Pdf calculation of the traction effort of switching locomotive. Type of electric drives, choice of motor, starting and running characteristics, speed control, temperature rise, particular applications of electric drives, types of industrial loads, continuous, intermittent and variable loads, load qualization. The backbone of train simulation physics is the simple equation, fma force mass x acceleration.
Introducing the tp56 tractive power corporations new tp56 is a fully customizable solution for the rail industrys switching requirements. The new view on the gear of formation of tractive effort allows to specify criteria of. Tractive effort of steam locomotives locomotive ratiosii by a. Pdf tractive effort curves in gearbox analyse researchgate. Tractive effort is the force needed to simply move the train. Resistance due to friction resistance due to friction is the resistance offered by. K and l mechanical tp70 industrial switcher k and l. Traction can be defined as the friction between a drive wheel and the surface it moves upon. Drive wheel motor torque calculations university of florida. Pdf for the complex simulation of dynamic behaviour of a locomotive in connection with drive dynamics and traction control, large. The magnitude and direction of these forces are calculated for equilibrium curving of a conventional twoaxle bogie in curves of 6001800 m radius, both without traction and for a level of tractive effort of 0. Nov 10, 2016 what is the difference in tractive effort and power in the locomotive stats.
When the wheels of a train slip on the rails, the torque is decreased to avoid continuous slipping. Starting tractive effort, found in the locomotive data sheet, is the rated tractive effort starting from a standstill in run8. Dieselelectric traction has the following advantages. Tractive effort, when multiplied with speed at which the train is required to run, gives the horsepower. Introducing the tp70 tractive power corporations new tp70 is a fully customizable solution for the rail industrys switching requirements. Longitudinal stresses due to tractive effort braking forces. Ahmed abdelrahim available tractive effort tractive effort determined by. Acceleration is a measure of how quickly you are gaining or losing speed.
The speed at which both forces are equal is the maximum speed. New interpretation of process of formation of tractive effort of the. The tp70 is a 3 axle railcar mover that offers more tractive effort with less horsepower, lower maintenance, less expensive components that are readily available. Power is the force needed to run a train at a certain speed. Traction motor used for traction purpose is dc series motor, separately excited dc series motor, three phase induction motor, synchronous motor and permanent magnet synchronous motor. W weight or vertical force between wheel and surface n, lb f m mass on. The simulations with a locomotive model running in a curve with varying tractive force show the influence on the wheelrail forces distribution and on the radial. The total tractive effort tte is the sum of the forces calculated in steps 1, 2, and 3. In other words, it is the sum of the tractive force and rolling effort on the road surface.
Tractive power corporation is a manufacturing, design and engineering company for industrial rail products and technology solutions. Pdf influence of locomotive tractive effort on the forces between. Tractive performances of single grouser shoe affected by. After some of the tractive effort is used to move the locomotive itself, the remaining effort, in the form of drawbarpull,isusedtomovetherestofthetrain. On higher speed vehicles friction in drive components may warrant the addition of 10%15% to the total tractive effort to ensure acceptable vehicle performance. Traction and curving are the principal causes of high tangential forces between railway rails and wheels. Unlike this method, tractive effort curves include much more information and so they can publish how well ratios are. Tractive effort determines how much a locomotive can haul. Diesel electric traction has the following advantages. The higher your speed, the lower your locomotives tractive effort.
What is the difference in tractive effort and power in the locomotive stats. Us3514960a method of,and means for reducing the tractive. Whatever may be source or principle of working of traction motor, all provide tractive effort characteristics to encounter train resistance and provide acceleration. To map out our tractive effort for 1st gear we simple take our torque and multiply it by the total gear ratio for 1st. The tp56 is a 3 axle railcar mover that offers more tractive effort with less horsepower, lower maintenance, less expensive components that are readily available. This locomotive develops,000 pounds of tractive effort.
C tractive effort te load handled by the locomotive. The term tractive effort is often qualified as starting tractive effort, continuous tractive effort and maximum tractive effort. Available tractive effort road vehicle performance. Tractive effort pdf ton engines free 30day trial scribd. When compared to the competition the tp70 offers greater fuel savings.
And means for reducing the tractive effort on an agricultural tool 2 sheetssheet 1 filed march 24. The exact location of your dog can be accessed directly via the free app. Oct 06, 2016 if you measure tractive effort at the wheel rim, and horsepower somewhere else, then you have to estimate the losses between those two locations. Driveline components for typical closed loop hydrostatic. As the speed increases, the tractive effort from the locomotives decreases and the drawbar pull available to move the train also decreases. The tractive force ft in the contact area between the tires of the driven wheels and the. Tractive power the tractive power of a locomotive should be adequate enough to overcome these resistances and haul the train at a specified speed. Tractive effort and resistance to motion tractive effort resistance to motion i have extended the speed range on the graph to show the point where the resistance to motion gets larger than the tractive effort. Tractive effort versus horsepower trains magazine trains. Resistance bound to the slope of 2% will oppose a force of fp 220 tons x 9,806 knewton x 2 100 64,7 kn. Utilization of electrical energy pdf notes uee pdf notes. The inner twothirds of the wing are cambered when the wing is extended, and are concerned with lifting effort in unsoarable air and with lifting and tractive effort in soarable air.
May 27, 2010 a the tractive effort f required b work done c average power required to accelerate load what i have done so far. Abstract the acceleration and deceleration rate of a train depends on the tractive force. The necessary tractive effort f t 220000 mass in kg x 0,23148 acceleration 50926 newtons, or. F traction effort or force acting on the wheel from the surface n, lb f. The dynamic equation of vehicle motion along the longitudinal direction is expressed by where dvdt is the linear acceleration of the vehicle along the longitudinal. Part a i worked out acceleration using av2 u2 2s giving me a 0. Understanding torque and horsepower with tractive force.
Sep 22, 2006 tractive effort determines how much a locomotive can haul. The tractive force between a car wheel and the surface can be expressed as. Tractive effort system and method download pdf info publication number cn103068662a. F tf is zero for a rearwheeldriven vehicle, whereas f tr is zero for a frontwheeldriven vehicle. In the main line train, tractive effort is caused by the locomotive, and in. It is the amount of force a wheel can apply to a surface before it slips. Ideally, tractive effort or output torque requirements should be derived from actual tests of the machine. When compared to the competition the tp56 offers greater fuel savings. Equation 1 indicates that the tractive force ft is a function of the ratio between the vehicle speed v and the engine. Measurement of tractive force and the new maximum tractive. Tractive effort of car dalemberts principle physics forums. So if they could handle the tractive effort of 80 000, then the engineer should not drive below 9.
As used in mechanical engineering, the term tractive force can either refer to the total traction a. Ppt railway engineering powerpoint presentation free to. To do this we will use the maximum tractive effort calculated in equation 9 which was 100 lbs. Tractive effort of steam locomotives locomotive ratiosii. Here you can find information about tractive products, read online user manuals, watch easytounderstand video tutorials and much more.
If you measure tractive effort at the wheel rim, and horsepower somewhere else, then you have to estimate the losses between those two locations. For a given tractive effort, increased horsepower allows an increased speed with other things remaining the same. Choose the topic you want to learn about to get professional support from the tractive customer service team. Tractive effort tractive effort refers to the amount of force available at the wheel or wheels of the vehicle and represents the maximum possible pull a vehicle could exert, if it had no resistance to movement. Im assuming power is how quickly the train will accelerate and tractive effort is ability to climb hills, but im not sure. Tractive effort and tractive resistance c12 springerlink. C is the product of coefficient of friction weight on the driving wheels.
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