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US 2007/0175032 A1Published application
Aerofoil assembly and a method of manufacturing an aerofoil assembly
AssigneeROLLS-ROYCE plc
InventorHilmi Kurt-Elli
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AssigneeROLLS-ROYCE plc
InventorHilmi Kurt-Elli
Estimating the term…
An aerofoil assembly, for example a bladed rotor assembly (40B) comprises a rotor (42) carrying a plurality of rotor blades (44), at least one of the rotor blades (44) having a coating (46) on the surface of the rotor blade (44). At least one of the rotor blades (44) has a coating (46) having a different thickness, a different area of contact with the surface of the rotor blade (44), a different position of contact on the surface of the rotor blade (44), a different shape of contact on the surface of the rotor blade (44) and/or a different composition compared to at least one of the other rotor blades (44). The coating (46) is applied in a non-uniform manner to reduce the vibration level of the rotor blade (44), or rotor blades (44), with the highest vibration response for a given excitation by changing the bladed rotor assembly (40B) mode shapes and the relative vibration of the rotor blades (44).
A method of manufacturing an aerofoil assembly comprising forming a structure carrying a plurality of aerofoils, the aerofoils having physical differences, exciting and measuring the vibration behaviour of each aerofoil, analysing the vibration behaviour of the aerofoils, determining where to add material to, or remove material from, the surface of at least one of the aerofoils and adding material to, or removing material from, the surface of at least one of the aerofoils of the aerofoil assembly is in a non-uniform manner to reduce the vibration level of the aerofoil, or aerofoils, with the highest vibration for the given excitation by changing the aerofoil assembly mode shapes and the relative vibration of the aerofoils.
Dependencies are inferred from the claim text.