NDLI: Force Feedback Control for Active Stabilization of Synchronous Whirl Orbits in Rotor Systems With Non-Linear Stiffness Elements

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Matthew, O. T. Cole Chamroon, Chakkapong Ngamprapasom, Prinya
Copyright Year	2010
Abstract	Synchronous vibration in rotor systems having bearings, seals or other elements with non-linear stiffness characteristics is prone to amplitude jump when operating close to critical speeds as there may be two or more possible whirl responses for a given unbalance condition. This paper describes research on the use of active control methods for eliminating this potentially undesirable behavior. A control scheme based on direct feedback of rotor-stator interaction forces is considered. Model based conditions for stability of low amplitude whirl, derived using Lyapunov’s direct method, are used as a basis for synthesizing controller gains. Subsidiary requirements for existence of a static feedback control law that can achieve stabilization are also explained. An experimental validation is undertaken on a flexible rotor test rig where non-linear rotorstator contact interaction can occur across a small radial clearance in one transverse plane. A single radial active magnetic bearing is used to apply control forces in a separate transverse plane. The experiments confirm the conditions under which static feedback of the measured interaction force can prevent degenerate whirl responses so that the low amplitude contact-free orbit is the only possible steady-state response. The gain synthesis method leads to controllers that are physically realizable and can eliminate amplitude jump over a range of running speeds.
Sponsorship	International Gas Turbine Institute
Starting Page	373
Ending Page	382
Page Count	10
File Format	PDF
ISBN	9780791844014
DOI	10.1115/GT2010-23246
e-ISBN	9780791838723
Volume Number	Volume 6: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2010: Power for Land, Sea, and Air
Language	English
Publisher Date	2010-06-14
Publisher Place	Glasgow, UK
Access Restriction	Subscribed
Subject Keyword	Whirls Stability Vibration Force feedback Bearings Rotors Control equipment Clearances (engineering) Magnetic bearings Steady state Feedback Stators Stiffness
Content Type	Text
Resource Type	Article

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