Design of an Experimental Setup for Periodic Forced Response Analysis of Shrouded Blades with Frictional Contacts

2019-11-02
Öney, Eren
Ciğeroğlu, Ender
High-cycle fatigue is one of the most frequent reasons of failure for turbomachinery and in early design process it is crucial to predict the vibration levels. Friction dampers or frictional contacts are commonly used in the design of gas turbine engines in order to decrease vibration levels and increase high-cycle fatigue lives of blades. However, due to the nonlinear behavior, dry friction complicates analysis of these systems. In this study, in order to understand the nonlinear frictional contact behavior which affects the damping characteristics of the shrouded blades, an experimental test setup is designed. The setup consists of a shrouded blade which is excited by a modal shaker and data acquisition system is designed to measure dynamic responses of stationary shrouded blade. The effects of different shroud contact angle, shroud positions along radial direction, normal preload and different excitation forces are investigated on the first bending mode of the blade.
Citation Formats
E. Öney and E. Ciğeroğlu, “Design of an Experimental Setup for Periodic Forced Response Analysis of Shrouded Blades with Frictional Contacts,” presented at the 8th Asian/Australian Rotorcraft Forum 2019, Ankara, TURKEY, 2019, Accessed: 00, 2021. [Online]. Available: http://www.arf2019.org/.