you need
• - dynamometer;
• - accelerometer;
• - speedometer or radar to measure the speed;
• - Calculator.
Guide
1
order to measure the traction force, attach to the body of the load cell and begin to move it evenly over the surface.Dynamometer show traction, which should be applied to the body that it moves smoothly.Changes are made in Newton.
2
If the body of a known mass is moving on a flat surface, the thrust can be calculated.To determine this coefficient of friction between the surface on which the moving body and the body itself μ.This can be done by a special table.Determine
how the body moves.If evenly, find traction F, multiplying coefficient of friction on the mass m of a body and the acceleration of gravity g = 10 m / s² (F = μ ∙ m ∙ g).
3
For example, if a car weighing 1,200 kg moving uniformly in a horizontal way, with a coefficient of friction of 0.05, the thrust of its engine will be F = 0,05 ∙ 1200 ∙ 10 = 600 N. If you needhigher measurement accuracy, take g = 9,81 m / s².
4
In that case, if the body is accelerating under the influence of traction, it will be equal F = m ∙ (μ ∙ g + a).Where a - is the value of acceleration, in m / s², which can be measured with an accelerometer.
5
To measure the traction motor, determine its maximum power.It is usually given in the technical documentation.Accelerate the machine, which is driven by this engine in motion to maximum speed, observing all safety precautions.Measure the speed of a speedometer or a special radar.To find the maximum thrust force F, divide it wattage N, speed v in m / sec (F = N / v).
6
For example, if the maximum power of the engine of the car 96 kW (if the power is supplied in horsepower, multiply by 735 to get it in watts), and its maximum speed is 216 km / hwhich is the maximum thrust of the engine?Find wattage: 96 ∙ 1000 = 96,000 watts.Express the speed in m / s, this 216 ∙ 1000/3600 = 60 m / s.Determine the traction motor: F = 960000/60 = 1600 N.