| 摘要 |
The blade has a hollow tip portion with an internal surface 28 extending across the direction of the centrifugal field on the blade. A weight 29 comprising e.g. Silicon Nitride or Carbide is caused by centrifugal force to bear on the surface 28 such that relative motion and hence friction between the weight and the surface serves to damp vibration of the blade. <IMAGE>
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