Control of Surge in Centrifugal Compressors by Active by Se Young Yoon, Zongli Lin, Paul E. Allaire

By Se Young Yoon, Zongli Lin, Paul E. Allaire

This thorough ebook covers rotordynamics and Active-Magnetic-Bearing know-how, from instability modeling and controller layout to implementation and trying out of the regulate set of rules in a specially-constructed industrial-size centrifugal compression method.

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6 that the shaft rotation would never excite one of the forward conical modes as the gyroscopic effects keep the mode frequency always above the rotor operating speed. 3 Instability due to Aerodynamic Cross Coupling Cross-coupling forces are in many cases the main cause of instability in rotordynamic systems. These forces are generated in components such as fluid-film bearings, impellers and seals, which are essential for the operation of the turbomachines. The aerodynamic cross-coupling forces are generated by the flow difference in the uneven clearances around impellers and seals caused by the rotor lateral motion.

6 Dimensionless conical natural frequency ratio versus the conical mode frequency ratio 36 2 Introduction to Rotor Dynamics for the extreme case of P ≥ 1, we observe in Fig. 6 that the shaft rotation would never excite one of the forward conical modes as the gyroscopic effects keep the mode frequency always above the rotor operating speed. 3 Instability due to Aerodynamic Cross Coupling Cross-coupling forces are in many cases the main cause of instability in rotordynamic systems. These forces are generated in components such as fluid-film bearings, impellers and seals, which are essential for the operation of the turbomachines.

The destabilizing effects of the aerodynamic cross-coupling forces are amplified when they are generated near the rotor midspan, far from the supporting bearings, where the effectiveness of the added damping by the bearings is significantly reduced. S. Alford in 1965 studied the forces found in the clearances around the aircraft gas turbine engine rotors, which tend to drive the turbine wheel unstable [3, 30]. These forces, affecting both turbines and compressors, came to be known as Alford forces or aerodynamic cross-coupling forces.

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