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//Chapter 10:Traction Drives
//Example 2
clc;
//Variable Initialization
M=100 //mass of each motor armature in tonne
Me=100
Tm=5000 //torque of each motor in N-m
Da=0.5 //average diameter of each motor in m
m=450 //mass of each wheel in kg
R=0.54 //radius of each wheel tread in m
N=4 //number of DC motors
r=25 //train resistance N/tonne
a=0.25 //gear ratio
nt=0.98 //gear transmission efficiency
G=50 //up gradient
Vm=100 //speed in kmph
//Solution
Ft=nt*Tm*N/a/R //Tractive efforts required to move the train
alpha=(Ft-(9.81*M*G+M*r))/(277.8*1.1*Me) //accelaration in metre per second
t=Vm/alpha //time taken to attain speed of Vm in sec
//Result
mprintf("\n Time taken to reach a speed of 100kmph is : t=%.1f sec",t)
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