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Diffstat (limited to '3532/CH8/EX8.1/Ex8_1.sce')
| -rw-r--r-- | 3532/CH8/EX8.1/Ex8_1.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/3532/CH8/EX8.1/Ex8_1.sce b/3532/CH8/EX8.1/Ex8_1.sce new file mode 100644 index 000000000..f91c1baa5 --- /dev/null +++ b/3532/CH8/EX8.1/Ex8_1.sce @@ -0,0 +1,22 @@ +clc
+clear
+mprintf('Mechanical vibrations by G.K.Grover\n Example 8.2.1\n')
+//given data
+E=1.96*10^11//youngs modulus in N/m^2
+m=5//mass of rotor in kg
+d=0.01//dia of shaft in m
+I=(%pi/64)*d^4///moment of area in m^4
+l=0.4//bearing span in m
+e=0.02//distance of CG away from geometric centre of rotor in mm
+N=3000//speed of shaft in RPM
+//calculations
+k=48*E*I/l^3//stiffness of shaft in N/m
+Wn=sqrt(k/m)
+W=2*%pi*N/60
+bet=(W/Wn)
+r=(bet^2*e/(1-bet^2))//from Eqn 8.2.2 in Sec 8.2
+rabs=abs(r)//absolute value of displacement
+Rd=k*rabs/1000//total dynamic load in bearings in N(divide by 1000 since r is in mm)
+F=Rd/2//dynamic load on each bearings in N
+//output
+mprintf(' The amplitude of steady state vibration of shaft is %f mm\nNOTE:negetive sign shows that displacement is out of phase with centrifugal force\nThe dynamic force transmtted to the bearings is %4.4f N\n The dynamic load on each bearing is %4.4f N',r,Rd,F)
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