Critical Speed of a Dual-Rotor System

Application ID: 78211


Due to the demand for larger power with a smaller size, dual-shaft systems with intershaft bearings are becoming a standard configuration for gas turbine engines. Such systems consist of two coaxial rotors running at different speeds, interlinked through a multi-spool bearing.

In this example, eigenfrequency analysis is performed for such a dual-rotor system in order to determine the critical speed. Cross-exciting vibrations through multi-spool bearings makes the dynamic behavior of one shaft dependent on the dynamic behavior of the other.

This model example illustrates applications of this type that would nominally be built using the following products: