Rolls-Royce Corporation

Garry Mark Edwards

Michael Frederick Bryant

A rotor stage of a gas turbine engine includes a platform from which rotor blades extend. The platform is provided with a circumferentially extending damper ring, the damper ring having an engagement surface that engages with the platform. The damper ring provides damping through slip between the engagement surface and the platform. The damper ring has a hoop stress that results in a load being provided to the platform from the engagement surface. The load can be optimized in order to provide improved damping.

Rotor damper

A rotor stage () of a gas turbine engine () comprises a platform () from which rotor blades extend. The platform is provided with a circumferentially extending damper ring (), the damper ring having an engagement surface () that engages with a platform engagement surface () of the platform (). The platform engagement surface () and the damper engagement surface () can move relative to each other in the radial direction. In use, the damper engagement surface () moves less in the radial direction than the platform engagement surface () in response to diametral mode excitation. This causes friction between the two surfaces, thereby dissipating energy and damping the excitation.

A rotor stage () of a gas turbine engine () comprises a platform () from which rotor blades extend. The platform is provided with a circumferentially extending damper ring (), the damper ring having an engagement surface () that engages with a platform engagement surface () of the platform (). In use, the damper engagement surface () and the platform engagement surface () move relative to each other in a radial direction, in response to diametral mode excitation. This causes friction between the two surfaces, thereby dissipating energy and damping the excitation. The rotor stage () is arranged such that the engagement load between the damper engagement surface () and the platform engagement surface () is a function of the rotational speed of the rotor stage ().

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Clevedon, United Kingdom

Garry Mark Edwards