Method for Predicting the Damping Ratio of Ring Dampers in Radial Standing Waves

Abstract

Blisks are utilized by most modern aircraft turbine engines to reduce the weight of rotors and eliminate air leakage between platforms. Ring dampers are widely used to reduce the vibration of blisks and avoid high-cycle fatigue. Two methods are proposed to calculate the damping caused by the radial displacement of the ring damper. First, the analytic method was provided by previous researchers. It is improved to increase the precision on calculating the range of slipping region. Second, a one-dimensional (1D) finite element method with novel iteration process is introduced by us. In this method, the ring damper is modeled using rod elements, and the energy dissipation due to friction is calculated through maximum displacement or time-marching. The damping ratio of the ring damper under arbitrary standing wave modes can be calculated using this novel method. The simulation results show that the 1D finite element method has good mesh independence. Both methods show good agreement in terms of damping ratio and the position of the slipping region.