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//CHAPTER 2,ILLUSTRATION 13 PAGE 67
//TITLE:TRANSMISSION OF MOTION AND POWER BY BELTS AND PULLEYS
clc
clear
//============================================================================================================================
//INPUT
PI=3.141
e=2.71
P=90// POWER OF A COMPRESSOR IN kW
N2=250// SPEED OF DRIVEN SHAFT IN rpm
N1=750// SPEED OF DRIVER SHAFT IN rpm
D2=1// DIAMETER OF DRIVEN SHAFT IN m
C=1.75// CENTRE DISTANCE IN m
V=1600/60// VELOCITY IN m/s
a=375// CROSECTIONAL AREA IN mm^2
density=1000// BELT DENSITY IN kg/m^3
L=1// length to be considered
Fb=2.5// STRESSS INDUCED IN MPa
beeta=35/2// THE GROOVE ANGLE OF PULLEY
U=.25// COEFFICIENT OF FRICTION
//=================================================================================================================================
//CALCULATION
D1=N2*D2/N1// DIAMETER OF DRIVING SHAFT IN m
m=a*density*10^-6*L// MASS OF THE BELT IN kg
Tmax=a*Fb// MAX TENSION IN N
Tc=m*V^2// CENTRIFUGAL TENSION IN N
T1=Tmax-Tc// TENSION ON TIGHTSIDE OF BELT IN N
F=(D2-D1)/(2*C)
ALPHA=asind(F)
THETA=(180-(2*ALPHA))*PI/180// ANGLE OF CONTACT IN radians
T2=T1/(e^(U*THETA/sind(beeta)))//TENSION ON SLACKSIDE IN N
P2=(T1-T2)*V/1000// POWER TRANSMITTED PER BELT kW
N=P/P2// NO OF V-BELTS
N3=N+1
//======================================================================================================================================
//OUTPUT
printf('NO OF BELTS REQUIRED TO TRANSMIT POWER=%f APPROXIMATELY=%d\n',N,N3)
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