Vibration
Analysis of Vertical Pumps D. R. Smith/G. M. Woodward,
15th Turbomachinery Symposium, Texas A&M University,
November 10-13, 1986, pp. 61-68 .
Vibration field
data was measured on several large motor-driven vertical cooling
water pumps which experienced excessive wear of the impellers, wear
rings and seals after a short period of operation. The data indicated
that the problem was due to the operating speed being near the pump-motor
system mechanical natural frequency, which resulted in excessive
vibration levels on the motors and pump impellers. The mechanical
natural frequency was very sensitive to the effective stiffness
of the connections between the concrete, baseplates, pump base and
motor flange. Tests were conducted to evaluate the advantages and
disadvantages of lowering the natural frequency below the running
speed and raising the natural frequency above the running speed.
The results of these tests are presented with conclusions and recommendations.
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