Only in rare cases does the vibration of a bladed disc assembly give concern for possible fatigue failures due to disc modes. This paper describes cases which should be investigated and outlines methods that can be used to prevent failures. Two types of bladed discs are treated; centrifugal applications with radial blades and those used for axial turbines or compressors. However, the theory is applicable to other discs. Analysis is presented showing cases of significant minor resonances over and above disc critical speeds.

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