Active Magnetic Anti-Whirl Control of Rotors

• Autorzy: Kurnik W.
• Konferencja: Polish-German Workshop on Dynamical Problems in Mechanical Systems (5 ; 31.08-6.09.1997 ; Zakopane, Poland)
• Języki publikacji: EN

Abstrakty

EN

A method of anti-whirl control of rigid rotors supported on hydrodynamic bearings utilising active magnetic actuators is developed in this paper from the concept introduced by the present author in the previous papers. The hybrid hydrodynamic-magnetic bearings are applied to support a rigid rotor asymmetric with respect to both geometric mass distribution and physical properties of hybrid supports. Hydrodynamic bearings provide the static load capacity of supports enabling the rotor to be considerably transversely loaded. The role of the magnetic forces is to stabilise the rotor behind its dynamic instability threshold corresponding to the fluid flow-induced self-excitation. Magnetic actuators of various configurations are used to generate additional radial forces contributing to the entire supporting force field. Two different control strategies are studied - one relating control signals to the current rotation speed, the other being based on detected velocity disturbances of the static equilibrium under constant in time transverse load. Both kinds of anti-whirl control are found to be effective and can result in considerable increase in the critical speed of rotation. Rotor asymmetry introduces a stabilising effect. It can be brought about by one-sided magnetic actuators with constant bias voltage. This opens a new chance for rotor stabilisation in emergency situations.

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Problems
• Rocznik: 1998
• Tom: Vol. 20
• Strony: 193--207
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Kurnik W.

• Institute of Machine Design Fundamentals, Warsaw University of Technology, Narbutta 84, 02-524 Warszawa, Poland