| 摘要 |
A powerplant, e.g. a ducted fan gas turbine engine (10, figure 1), contains a rotatable shaft 16 and an associated stage of blades (12, figure 1), a shaft vibration damping ring 26 structure surrounding said shaft in indirect contact therewith via a bearing housing 24 of an associated shaft bearing 18, a fixed structure 20 surrounding said ring structure to enable limited radial movement of the ring structure and means to effect clamping of said ring structure to provide vibration damping in the event of shaft orbiting due to a load imbalance during operational rotation. In one embodiment a chamber 22 contains a number of annular plates 32, alternate ones of which engage the ring 26 and the wall of chamber 22 respectively and a spring as the vibration damping device. In another embodiment a thick annular ring (40, figure 3) and spigots (44, 46, figure 3) are used as the vibration damping device. |
