Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Mistune effects on vibration amplitude

The actual design of rotors assumes the cyclic symmetry of the part, that means, for instance, that all the blades are identical. In reality, local variations in material properties, manufacturing and ageing of the part break the cyclic symmetry. Among others, the result is that the vibration properties of the blades differ from one another. This phenomenon, called mistune, can cause an amplification of the blades response to mechanic and aerodynamic excitations.
The experiments carried out during ADTURB II are very valuable because the test conditions have been carefully characterised.
These results will be used to validate new design methods currently under development aiming at reducing the sensitivity of the rotor design to mistuning.
These results will lead to improve the reliability of the engines and the safety of the flights. Turbomeca engines are used on airplanes as well as helicopters for both military and civil application.
Moreover, improving the robustness of the design to production tolerances will reduce the production costs.

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