Browsing by Author "Frei, Arno"

Now showing items 1-6 of 6

    • Design Of Pump Shaft Trains Having Variable-Speed Electric Motors 
      Frei, Arno; Grgic, Andrej; Heil, Werner; Luzi, Armin (Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University, 1986)
      With converter-fed variable speed electric motors, pulsating torques inevitably occur in the air gap and can cause torsional oscillation in the whole shaft line. The origin and behavior of these torques and how to calculate ...
    • Dynamic Loading On Pumps - Causes For Vibration 
      Florjancic, Stefan; Frei, Arno (Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University, 1993)
      Some insight into the mechanism which generate lateral dynamic loads, and hence vibrations, on centrifugal pumps is presented in a general way, and the individual loads are explained and quantified. Without extensive use ...
    • Predicting And Improving The Dynamic Behavior Of Multistage High Performance Pumps 
      Bolleter, Ulrich; Frei, Arno; Florjancic, Dusal (Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University, 1984)
      Good rotordynamic behavior, implying sufficient stability margin and low sensitivity to unbalance forces, is mandatory for modern high pressure multistage pumps. Stiffness, damping and mass matrices describing the forces ...
    • Rotordynamic And Dry Running Behavior Of A Full Scale Test Boiler Feed Pump 
      Frei, Arno; Gulich, Johann; Eichhorn, Guenther; Eberl, Josef; McCloskey, Thomas H. (Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University, 1990)
      Excessive rotor vibrations are one of the leading causes of damage to pump components, particularly to bearings, shaft seals, and premature wear of labyrinth surfaces. Under an EPRI contract which was awarded to Sulzer in ...
    • Shaft Sizing For Multistage Pumps 
      Bolleter, Ulrich; Frei, Arno (Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University, 1993)
      For proper sizing of pump shafts, many criteria need to be considered such as stress, deformation, and rotordynamics. The authors try to shed more light on these areas in order to ensure economic, safe, and reliable pump ...
    • Torsional Vibration In Pump/Driver Shaft Trains - The Role Of External Damping From Pump Impellers 
      Nordmann, Rainer; Weiser, Peter; Frei, Arno; Stuerchler, Rudolph (Texas A&M University. Turbomachinery Laboratories, 1996)
      Consideration of torsional vibration in pump/driver shaft trains has become of increasing importance with the development of electronically controlled variable speed electric motors. Such motors not only provide a static ...