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Diffstat (limited to '698/CH7/EX7.9/9_base_excitation.txt')
| -rw-r--r-- | 698/CH7/EX7.9/9_base_excitation.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/698/CH7/EX7.9/9_base_excitation.txt b/698/CH7/EX7.9/9_base_excitation.txt new file mode 100644 index 000000000..83dabe396 --- /dev/null +++ b/698/CH7/EX7.9/9_base_excitation.txt @@ -0,0 +1,14 @@ +This is a forced, steady state vibration situation.
+
+There are 2 supporting springs, hence net stiffness Ke=2k
+Damping coefficient Ce = 0.05 Cc = 0.05*2*sqrt(Ke*m)
+
+The expression for desired amplitude Y is
+
+ Y=Fo/sqrt((ke-m*w^2)^2+(Ce*w)^2)
+Y will be maximum at resonance, i.e., w=wn
+Thus the design condition is k=(1/2)m*w^2
+ k=21.73 kN/m
+
+At resonance, Y=Fo/c*w
+The peak solenoid force required is 2.17 N
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