Force feedback control for active stabilization of synchronous whirl orbits in rotor systems with non-linear stiffness elements

M.O.T. Cole, C. Chamroon, P. Ngamprapasom

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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. Modelbased 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.
Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo
Subtitle of host publicationVolume 6, Parts A and B
PublisherASME
Pages373-382
ISBN (Print)9780791844014
Publication statusPublished - 1 Jan 2010
EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, June 14, 2010 - June 18, 2010 - Glasgow, UK United Kingdom
Duration: 1 Jan 2010 → …

Conference

ConferenceASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, June 14, 2010 - June 18, 2010
CountryUK United Kingdom
CityGlasgow
Period1/01/10 → …

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    Cole, M. O. T., Chamroon, C., & Ngamprapasom, P. (2010). Force feedback control for active stabilization of synchronous whirl orbits in rotor systems with non-linear stiffness elements. In Proceedings of the ASME Turbo Expo: Volume 6, Parts A and B (pp. 373-382). ASME.