2011•Journal of Shenyang Aerospace UniversityRequires access

Finite element analysis on dynamic characteristics of a counter-rotating dual-rotor system

AI Shu-min

Abstract

Recently,the finite element method has been widely used in calculating dynamic characters of rotor systems.In this paper,the dynamic characteristics of a counter-rotating dual-rotor system are calculated by the finite element method and the system is analysed for the characteristics of critical speeds and normal modes.The influence of the inter-shaft bearing stiffness and the speed ratio on the critical speeds of this dual-rotor system is also studied.The useful conclusions obtained through analysis on the results will provide certain reference value on designing a counter-rotating dual-rotor system.

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Key concepts: Rotor (electric), Critical speed, Finite element method, Dual (grammatical number), Helicopter rotor, Control theory (sociology), Stiffness, Bearing (navigation)