| 摘要 |
A fan blade ( 26 ) comprises a leading edge ( 44 ), a trailing edge ( 46 ), a concave wall portion ( 50 ) extending from the leading edge ( 44 ) to the trailing edge ( 46 ) and a convex wall portion ( 52 ) extending from the leading edge ( 44 ) to the trailing edge ( 46 ). A flexible wall ( 56 ) is arranged within the fan blade ( 26 ) to partially define a plurality of chambers ( 60 ) with an internal surface ( 54 ) of the convex wall portion ( 52 ). The flexible wall ( 56 ) is arranged substantially parallel to the internal surface ( 54 ) of the convex wall portion ( 52 ) and a plurality of walls ( 64 ) connect the internal surface ( 54 ) of the concave wall portion ( 50 ) and the flexible wall ( 56 ). The chambers ( 60 ) contain a fluid. The chambers ( 60 ) are interconnected by apertures ( 62 ) such that in operation deflection of the flexible wall ( 56 ) by vibrations of the fan blade ( 36 ) produce a flow of fluid between the chambers ( 60 ) through apertures ( 62 ), which is restricted by the apertures ( 62 ) to damp vibrations of the fan blade ( 26 ). |
