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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /213/CH8/EX8.10/8_10.sce | |
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Diffstat (limited to '213/CH8/EX8.10/8_10.sce')
| -rwxr-xr-x | 213/CH8/EX8.10/8_10.sce | 51 |
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diff --git a/213/CH8/EX8.10/8_10.sce b/213/CH8/EX8.10/8_10.sce new file mode 100755 index 000000000..c6dd92db2 --- /dev/null +++ b/213/CH8/EX8.10/8_10.sce @@ -0,0 +1,51 @@ +//To find velocity, torque and acceleration
+clc
+//Given:
+NAO=100 //rpm
+OA=150/1000,AB=600/1000,BC=350/1000,CD=150/1000,DE=500/1000 //m
+dA=50/1000,dB=dA,rA=dA/2,rB=dB/2 //m
+pF=0.35 //N/mm^2
+DF=250 //mm
+//Solution:
+//Refer Fig. 8.21
+//Calculating the angular speed of the crank AO
+omegaAO=2*%pi*NAO/60 //rad/s
+//Calculating the velocity of A with respect to O
+vAO=omegaAO*OA //m/s
+vA=vAO
+//By measurement from the velocity diagram, Fig. 8.21(b),
+vBA=1.65,vBC=0.93,vB=vBC,vED=0.18,vEO=0.36,vE=vEO,vF=vE //m/s
+//Calculating the velocity of D with respect to C
+vDC=vBC*CD/BC //m/s
+//Calculating the angular velocity of B with respect to A
+omegaBA=vBA/AB //rad/s
+//Calculating the angular velocity of B with respect to C
+omegaBC=vBC/BC //rad/s
+//Calculating the rubbing velocity of pin at A
+vrA=(omegaAO-omegaBA)*rA //The rubbing velocity of pin at A, m/s
+//Calculating the rubbing velocity of pin at B
+vrB=(omegaBA+omegaBC)*rB //The rubbing velocity of pin at B, m/s
+//Calculating the force at the pump piston at F
+FF=pF*%pi/4*DF^2 //N
+//Calculating the force required at the crankshaft A
+FA=FF*vF/vA //N
+//Calculating the torque required at the crankshaft
+TA=FA*OA //N-m
+//Calculating the radial component of the acceleration of A with respect to O
+arAO=vAO^2/OA //m/s^2
+//Calculating the radial component of the acceleration of B with respect to A
+arBA=vBA^2/AB //m/s^2
+//Calculating the radial component of the acceleration of B with respect to C
+arBC=vBC^2/BC //m/s^2
+//Calculating the radial component of the acceleration of E with respect to D
+arED=vED^2/DE //m/s^2
+//By measurement from the acceleration diagram, Fig. 8.21(c),
+aBC=9.2,aB=aBC,aBA=9,aE=3.8 //m/s^2
+//Calculating the acceleration of D
+aD=aBC*CD/BC //m/s^2
+//Results:
+printf("\n\n The velocity of the cross-head E, vE = %.2f m/s.\n",vE)
+printf(" The rubbing velocity of pin at A = %.3f m/s.\n",vrA)
+printf(" The rubbing velocity of pin at B = %.3f m/s.\n",vrB)
+printf(" The torque required at the crankshaft, TA = %d N-m.\n",TA)
+printf(" The acceleration of the crosshead E, aE = %.1f m/s^2.\n\n",aE)
\ No newline at end of file |