Towards the Efficient Vibration Analysis of Shrouded Bladed Disk Assemblies

Abstract

Prediction of the vibration properties of turbomachine blades and disks is an essential part of turbine design. However, the complexity of modern machines and the necessity to analyze the complete assembly of disk, blades, and shroud combine to make this a lengthy task. This paper describes an investigation aimed at improving the efficiency of such prediction techniques. The assembly is analyzed by studying each component individually and then combining these together with a receptance coupling technique by matching forces and displacements at each connection point. A study is made to establish which of the 6 coordinate directions at each junction need to be included in this process. The results of this study clearly demonstrate the necessity for including certain coordinates while others may be omitted with little loss of accuracy.