Resonant Vibration Levels of a Mistuned Bladed Disk

Abstract

Using a simplified but representative model for a mistuned bladed disk, a series of case studies has been made to examine in detail the influence of various parameters on the resonant response levels of each blade on the disk. Although confined to a specific model of a 33-bladed disk, and thus not attempting to generalize its results, the study examines systematically the importance of individual blade mistune, precision of individual blade data, position in an arrangement, and type of arrangement. It is found that mistuning always causes a deterioration in the vibration environment in that the maximum response is always increased, although the extent of this worsening varies over quite a wide range. In this study, a blade with an extreme of mistune is always found to suffer the highest response levels.