Abstract: In a nozzle guide vane assembly for a compressor or fan stage of a gas turbine engine each of the guide vanes is held in position between an outer casing and an annular inner ring by means of a rubber boot or collar at each end of the vane. Operational experience has shown potential for these assemblies to resonate within the engine, the cause of which is traced to the stiffness of the rubber collar. The present invention proposes as a solution a modified form of collar in which a stiffening plate is either bonded to the surface of the rubber or is incorporated into the construction during the rubber vulcanisation process. Alternatively or in addition the properties of the material from which the boots are moulded may be modified by the inclusion of chopped fibres of a range of materials.

Abstract: A component, for example a fan blade for a gas turbine engine, comprises panels 2 and 4 which define between them a cavity containing a warren girder structure 6. Internal surfaces of the panels 2 and 4 are provided with a damping material 14, disposed between regions of contact 12 between the warren girder 6 and the panels 2, 4. The damping material damps vibrations of the component, so extending its fatigue life.

Abstract: A component, for example a fan blade for a gas turbine engine, comprises panels 2 and 4 which define between them a cavity containing a warren girder structure 6. Internal surfaces of the panels 2 and 4 are provided with a damping material 14, disposed between regions of contact 12 between the warren girder 6 and the panels 2, 4. The damping material damps vibrations of the component, so extending its fatigue life.

Abstract: A tip treatment bar (16) for a gas turbine engine has a damping coating (24) applied to one or more sides. The coating (24) may be a hard ceramic, for example Magnesia Alumina Spinel, and this may be plasma sprayed directly on to the bar (16) or applied to a substrate (26) which may then be applied to the bar (16).

Abstract: A tip treatment bar (16) for a gas turbine engine has a damping coating (24) applied to one or more sides. The coating (24) may be a hard ceramic, for example Magnesia Alumina Spinel, and this may be plasma sprayed directly on to the bar (16) or applied to a substrate (26) which may then be applied to the bar (16).