FORCED RESPONSE ANALYSIS OF MULTI-LEVEL ROTOR SYSTEMS WITH SUBSTRUCTURE.

摘要

This dissertation develops a numerically efficient accurate methodology for the steady-state forced response analysis of a multi-rotor system including substructure. The method involves formulating a coupling model which includes the gyroscopic and inter-subsystem coupling degrees of freedom. The subsystems are coupled using stiffness and damping coefficients that represent bearings, seals, or aero-dynamic cross-coupling. Solution of the coupling model yields the coupling forces between subsystems and the gyroscopic moments. Knowing these forces and moments and the externally applied forces, the analyst can then calculate the response at any degree of freedom in any subsystem independently of all other degrees of freedom.; Included with the derivation are numerical examples demonstrating the calculations involved in implementing the methodology, and two applications to actual machines.