Study on the friction damping characteristics of bladed disk (Effect of the friction model on the transient response passing through resonance)

Abstract

The vibration characteristics of a bladed disk with the continuous ring type structure have been studied extensively, and the vibration response analyses considering the friction damping between adjacent shrouds have been performed in the blade design. The effect of the friction damping on the self-excited vibration also has been studied by several researchers. However, because the most of these studies have been performed using the simple macroslip model, the damping characteristics of bladed disks with the friction damping are not yet clarified sufficiently. Moreover, few studies have focused on the transient response of a blade with the friction damping. In this paper, the damping characteristics of bladed disks with the continuous ring type structure is studied using the conventional macroslip model and the sophisticated microslip model for the transient response when passing through the resonance, and the results calculated by both models are compared. From the analysis results, it is concluded that, in the transient response when passing through the resonance, the damping characteristics predicted by both models are qualitatively the same if the excitation force is extremely large or small. However, when the excitation force is medium, the damping characteristics predicted by both models are quantitatively different. Therefore, it is recommended that the microslip model with appropriate parameters is used to improve the accuracy of the prediction of the damping characteristics.

Keywords

• turbomachinery
• forced vibration
• transient vibration
• resonance
• blade
• damping