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//CHAPTER 3 ILLUSRTATION 8 PAGE NO 107
//TITLE:FRICTION
clc
clear
//===========================================================================================
//INPUT DATA
W=50000// WEIGHT OF THE SLUICE GATE IN NEWTON
P=40000// POWER IN WATTS
N=580// MAX MOTOR RUNNING SPEEED IN rpm
d=12.5// DIAMETER OF THE SCREW IN cm
p=2.5// PITCH IN cm
PI=3.147
U1=.08// COEFFICIENT OF FRICTION for SCREW
U2=.1// C.O.F BETWEEN GATES AND SCREW
Np=2000000// NORMAL PRESSURE IN NEWTON
Fl=.15// FRICTION LOSS
n=1-Fl// EFFICIENCY
ng=80// NO OF TEETH ON GEAR
//===========================================================================================
//CALCULATION
TV=W+U2*Np// TOTAL VERTICAL HEAD IN NEWTON
ALPHA=atand(p/(PI*d))//
PY=atand(U1)//
P1=TV*tand(ALPHA+PY)// FORCE IN N
T=P1*d/2/100// TORQUE IN N-m
Ng=60000*n*P*10^-3/(2*PI*T)// SPEED OF GEAR IN rpm
np=Ng*ng/N// NO OF TEETH ON PINION
//=========================================================================================
//OUTPUT
printf('NO OF TEETH ON PINION =%.2f say %d',np,np+1)
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