Modal Analysis of Elastic Ring Squeeze Film Damper for Small Gas Turbine Engines

S. Thennavarajan[1][2], P. Jeyaraj [1], L. P. Manikandan [2], S. S. Kulkarni [2], S. Jana [2],
[1]Department of Mechanical Engineering, NITK, Surathkal, Mangalore, Karnataka, India
[2]CSIR- National Aerospace Laboratories, Bengalore, Karnataka, India
Published in 2016

The high speed gas turbine is a power plant developed for modern aircrafts. It is widely used and developed because it can meet the high power to weight ratio. The rotor system of modern small gas turbine works above the critical speeds. Hence, there is a stricter requirement for the control and isolation of vibration magnitude under heavy unbalance load and passing through critical speeds. An advanced oil film damper known as Elastic Ring Squeeze Film Damper (ERSFD) built with orifice pattern has better dynamic characteristics. This ERSFD and rotor components are analyzed using COMSOL Multiphysics® software to find its mode shapes and ERSFD’s profile pressure distribution at orifice under the ring subjected to vibration.