<p>Structural layout scheme of dual rotor system with inter-shaft bearing plays an important role in reducing the bearing frame and structure weight of areo-engine, which is often used in the design of high thrust-weight ratio turbofan engine. However, the inter-shaft bearing will cause the direct interaction of the force and displacement between the high and low pressure rotor systems, which is easy to cause the coupling of the dynamic characteristics of two rotor systems, and eventually lead to the failure of the rotor displacement control, loss of the robustness of the connection structure or excessive dynamic load of the bearing. The main purpose of this paper is to study and quantitatively evaluate the coupling characteristics of the dual rotor system, obtain the correlation between the structural feature parameters such as the position of the inter-shaft bearing, and the coupling vibration or interactive excitation characteristics of the system, to propose the coupling vibration control method of dual rotor system finally.</p><p>The dynamic model of dual rotor system with inter-shaft bearing is established. The modal frequencies and modes of dual rotor system with or without coupling are analyzed and compared, which illustrated the complexity of coupled vibration of high pressure and low pressure rotors. Then modal coupling characteristics evaluation parameter of dual rotor system based on energy distribution relationship is proposed, by using which the correlation between the inter-shaft bearing support feature and the modal coupling characteristics is analyzed and discussed. The results show that, placing the inter-shaft bearing near the mass center of low pressure turbine can effectively restrain the mode coupling, meanwhile the proportion of bearing strain energy can also reflect the mode coupling characteristics of dual rotor system to a certain extent. Then a method, based on the principle of mode superposition, for the response coupled vibration control of a double rotor system with inter-shaft bearing is proposed. An example verifies the availability of the method, which can control the response coupling vibration of dual rotor system in wide speed range and under complex excitation conditions.</p>

Method of Coupled Vibration Control for Dual Rotor System With Inter-Shaft Bearing

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

Turbo Expo 2021

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