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Effect of Component Interference Fit and Fluid Density on the Lateral and Torsional Natural Frequencies of Pump and Turbomachinery Rotor Systems

In the determination of rotor lateral and torsional natural frequencies of rotating machinery, the mathematical methods are considered mature, and are accurate within the bounds of the properties and assumptions input into them. However, precise calculation of rotordynamic behavior remains challenged by issues such as the effects of stiff components attached to the shaft, and the effects of dense gases or liquids within and surrounding the rotor system. The authors have performed a careful series of bench tests and installed rotor tests to determine the effect on lateral and torsional natural frequencies of interference fit stiffening and fluid added mass (lateral and torsional), for various bladed disk and centrifugal impeller design styles.