Critical Speed Analysis Of An Eight-Stage Centrifugal Pump
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A critical speed and unbalance response analysis of an eight-stage centrifugal pump was performed, considering the variation of stiffness and damping coefficients with speed for both the oil firm bearings and the fluid seals (interstage, neck ring and balance position). The rotor response to unbalance was predicted and compared to measured test stand data, utilizing four different methods to estimate he fluid seal effects. The comparison showed that correlation was best when using the latest finite length seal procedures. The wide variation in predicted critical speeds and response amplitudes indicates the need for additional research in this area, to define the exact stiffness and damping values for fluid film seals.
Atkins, Kenneth E.; Tison, James D.; Wachel, J. C. (Buddy) (1985). Critical Speed Analysis Of An Eight-Stage Centrifugal Pump. Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University. Available electronically from