Hydraulic forces in annular seals may have a large influence on the vibrations of high speed centrifugal pumps. To have a better knowledge about such seal effects, theoretical as well as experimental studies are important in the actual research of rotordynamics. In this chapter a theoretical model and an identification procedure are presented to determine the dynamic coefficients of seals by calculation and measurements as well. The identified parameters confirm the assumptions in modelling and point out, that the stiffness and damping characteristics of seals are significant for the stability behavior of pumps.
KeywordsFrequency Response Function Leakage Flow Fluid Element Dynamic Coefficient Circumferential Velocity
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