| 摘要 |
A damper 25, which in use is arranged to be inserted within a core passage 30 of a blade 20, is retained in the blade by head 26 with the remainder of the damper 25 able to move within the passage 30. Such movement generates friction which dissipates vibrations. The damper 25 comprising a plate 24 upon which are at least two discrete substantially oppositely directed contact regions which are arranged, in use, to frictionally engage the passage 30, while allowing cooling air to flow. The contact regions may be provided by protrusions in the form of contact pads 28a, 28b or arms (42, fig 4 and 62, fig 5) extending from the plate or be provided by the corrugations of the plate (fig 6). A contact load on the contact regions may be provided by the resilience of the damper, an interference fit of the damper in the passage and/or centrifugal loading of the damper and contact regions during operation. A taper on the head (27, fig 7) may engage with a chamfered opening (23, fig 7) of the passage 30.
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