Experimental study on dynamic coupling characteristics of mid turbine frame

Abstract

Aiming at the problem of excessive vibration of a dual-rotor engine with mid turbione frame structure between turbine stages, establishing a nonlinear dynamic model of the dual-rotor system with mid turbine frame. Considering the nonlinear forces of the squeeze film damper and the rolling bearing, a test rig is established for experimental verification. The test results of the system vibration response show that the power turbine and the gas generator are coordinately connected with the mid turbine frame structure, and there is coupling between them, which makes the mid turbine frame structure dual rotor system produce coupling vibration.