Dynamic Modelling Research of the Dual-Rotor System for Aero-Engine
Keywords:
Aero-engine; Dynamic modelling; dual-rotor system; Inherent characteristics; Unbalanced response.Abstract
At present, dual-rotor structure is widely used in aero-engines. In this structure, low-pressure rotor and high-pressure rotor sleeve together. The vibration of rotor system caused by the blade disks, the supportings, the unbalance of rotor and the misalignment of supportings, is the main source of aero-engine vibration fault. The study are insufficiency on inherent characteristics, unbalanced vibration response of the internal and external dual rotor aero-engine, coupling of unbalanced vibration between two rotors. Combining theory, simulation and experiments is the main method to study the vibration characteristics of aero-engine. By building a simplified test-bed, the influence of many interference factors in aero-engine can be eliminated and the basic vibration characteristics of aero-engine can be analyzed. However, there are few test-beds for studying the vibration characteristics of aero-engine dual-rotor at present, as well as the study on basic vibration characteristics. Aiming at the internal and external dual rotor system of aero-engine, vibration characteristics analysis of aero-engine dual-rotor system was carried out. Based on the dual rotor system of aero-engine, Introducing the sleeve coupling and intermediate bearing, aero-engine dual-rotor system model was built according to the principle of equivalent mass and equivalent moment of inertia.
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