Aerofoil assembly and a method of manufacturing an aerofoil assembly

A method of manufacturing an aerofoil assembly comprising the steps of:

• (a) forming a structure carrying a plurality of aerofoils, the structure and aerofoils forming the aerofoil assembly, the aerofoils having physical differences,
• (b) exciting and measuring a vibration behaviour of the aerofoil assembly,
• (c) analysing a vibration behaviour of the aerofoil assembly,
• (d) determining where to add material to, or remove material from, a surface of at least one of the aerofoils of the aerofoil assembly in a non-uniform manner to reduce a vibration level of the aerofoil, or aerofoils, with the highest vibration for the given excitation by changing aerofoil assembly mode shapes and a relative vibration of the aerofoils in the aerofoil assembly so that a collective vibration behaviour of the aerofoil assembly of vibrationally interacting aerofoils is improved, and
• (e) adding material to, or removing material from, the surface of the at least one of the aerofoils of the aerofoil assembly in the determined 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 in the aerofoil assembly so that the collective vibration behaviour of the aerofoil assembly of vibrationally interacting aerofoils is improved,
• wherein step (b) follows step (a), step (c) follows step (a), step (d) follows steps (b) and (c), and step (e) follows step (d).

A method of manufacturing an aerofoil assembly comprising the steps of:

• (a) forming a structure carrying a plurality of aerofoils, the structure and aerofoils forming the aerofoil assembly, the aerofoils having physical differences,
• (b) exciting and measuring a vibration behaviour of each aerofoil,
• (c) analysing a vibration behaviour of the aerofoils,
• (d) determining where to add material to, or remove material from, a surface of at least one of the aerofoils of the aerofoil assembly in a non-uniform manner to reduce a vibration level of the aerofoil, or aerofoils, with the highest vibration for the given excitation by changing aerofoil assembly mode shapes and a relative vibration of the aerofoils in the aerofoil assembly so that a collective vibration behaviour of the aerofoil assembly of vibrationally interacting aerofoils is improved, and
• (e) adding material to, or removing material from, the surface of the at least one of the aerofoils of the aerofoil assembly in the determined 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 in the aerofoil assembly so that the collective vibration behaviour of the aerofoil assembly of vibrationally interacting aerofoils is improved,
• wherein step (b) follows step (a), step (c) follows step (a), step (d) follows steps (b) and (c), and step (e) follows step (d).