Dynamic Loading On Pumps - Causes For Vibration
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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 of formulas and equations, this information can identify the significant types of forces and separate them from less important ones. Measured data of lateral dynamic forces and resulting vibrations on pumps are presented, the individual causes are identified, and means to reduce specific loading forces are shown. However, loading forces cannot be eliminated totally. Therefore, approximate levels of forces which have to be accepted as physical properties of a centrifugal pump are established. The particular comparison of mechanical versus hydraulic loading forces consequently leads to the definition of reasonable limits on mechanical balancing and rotor runout. When mechanical loading forces become much smaller than hydraulic forces, tighter manufacturing tolerances will not further improve the overall vibration behavior.
Florjancic, Stefan; Frei, Arno (1993). Dynamic Loading On Pumps - Causes For Vibration. Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University. Available electronically from