Preliminary studies of Newly Conceptualized Intershaft Squeeze Film Damper (ISSFD) Rings

摘要

In modern aircraft gas turbine engines, the use of external damping devices have become inevitable for attenuation of vibrations caused by various reasons. Ultimately the light-weight construction of aircraft engine together with higher efficiency and reduced problems related to vibrations is made possible by careful design of such damping devices. This effort basically concentrates on preliminary studies of a newly conceptualized intershaft squeeze film damper(ISSFD) ring for an intershaft bearing in a two spool configured system. The conceptualized ISSFD ring is modelled using FEM and tested for its stiffness characteristics and induced Von-Mises stresses. Later, two ISSFD rings having four and three grooves are fabricated and tested on a dedicated static stiffness evaluation test rig fabricated solely for the purpose of evaluating the static stiffness. The experimental results correlate well with the FE results. The newly conceptualized ISSFD ring is ready to be evaluated on a dynamic test rig for its potential of being used as a squeeze film damper in an inter shaft bearing of a typical two spool gas turbine.