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Analysis of flutter-induced limit cycle oscillations in gas-turbine structures with friction, gap, and other nonlinear contact interfaces

Described, a new method developed to predict and comprehensively analyse, the limit-cycles of flutter-induced vibrations in structures with nonlinear contact interfaces. New mechanisms of limiting the flutter-induced vibrations by contact interfaces have been revealed.

The method allows, for the first time, the direct calculation of limit-cycle amplitudes and frequencies as functions of contact interface parameters, using realistic large-scale finite element models of structures. The method has been implemented within the in-house code developed by the author and used at Rolls-Royce plc. for studies of nonlinear vibrations in gas turbine engines. Contact: Mr Robert Elliott, Tel: 01332243513, E-mail: Robert.Elliott@Rolls-Royce.com.