initial commit / add all books

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+//To find number of V-belts

+clc

+//Given:

+P=90 //kW

+N2=250, N1=750 //rpm

+d2=1, x=1.75 //m

+v=1600/60 //m/s

+a=375*10^-6 //m^2

+rho=1000 //kg/m^3

+sigma=2.5*10^6 //N/m^2

+beta=35/2 //degrees

+mu=0.25

+//Solution:

+//Calculating the diameter of the pulley on the motor shaft

+d1=d2*(N2/N1) //m

+//Calculating the mass of the belt per metre length

+l=1 //m

+m=a*l*rho //kg/m

+//Calculating the centrifugal tension

+TC=m*v^2 //N

+//Calculating the maximum tension in the belt

+T=sigma*a //N

+//Calculating the tension in the tight side of the belt

+T1=T-TC //N

+//Refer Fig. 11.21

+//Calculating the angle alpha

+alpha=asin((d2-d1)/(2*x))*180/%pi //degrees

+//Calculating the angle of lap on smaller pulley

+theta=(180-2*alpha)*%pi/180 //radians

+//Calculating the tension in the slack side of the belt

+T2=T1/exp(mu*theta*(1/sind(beta))) //N

+//Number of V-belts:

+//Calculating the power transmitted per belt

+P1=(T1-T2)*v/1000 //Power transmitted per belt, kW

+//Calculating the number of V-belts

+n=P/P1 //Number of V-belts

+//Calculating the length each of belt for an open belt drive

+L=%pi/2*(d2+d1)+2*x+(d2-d1)^2/(4*x) //m

+//Results:

+printf("\n\n Number of V-belts = %d.\n\n",n+1)

+printf(" Length of each belt, L = %.3f m.\n\n",L)
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