Page 144 - Improving Machinery Reliability

116 Improving Machinery Reliability

Figure 3-28. Two-diameter mode shape for centrifugal impeller at 1,360 Hz determined
by modal analysis tests.

5000 30X

I CIR
4 DIA
4000
N
::
I-
I
>
9 3000 3 DIA
Y
0
a:
W
U I5X
-1
U 3
P
1 2000
p:
W J
-I
L 0 CIR
2 DIA
z
U
I000
1 DIA
0
0 2000 4000 6000 8000 10000
RUNNING SPEED, RPH
Figure 3-29. Interference diagram for centrifugal impeller.