Rotordynamics/discharge water-hammer coupling via seals in pump rotordynamics
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A new closed-loop frequency-domain model is developed to incorporate the water hammer effect with pump rotordynamics, in order to investigate the sub-synchronous instability problem observed in a field pump. Seal flow-rate perturbations due to eccentricity are calculated from Soulas and San Andres's seal code. A complete transfer function matrix between rotor motion and reaction force due to pressure perturbation is developed in detail. Stability analysis with transfer-function'add-in' modules is conducted in XLTRC2. Seal clearances and the reaction force angle are found to be important in shifting natural frequencies and damping. The sub-synchronous instability observed in field is duplicated successfully with double-clearance seals.
Zhang, Kaikai (2005). Rotordynamics/discharge water-hammer coupling via seals in pump rotordynamics. Master's thesis, Texas A&M University. Texas A&M University. Available electronically from