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Abstract
Rotorcrafts often involve fatigue sensitive components that present complex three dimensional geometries and undergo small deformations, such as a fuselage, a swashplate and pitch link rods. For those components, two questions must be answered: (1) what is the impact of the flexibility of the component on the dynamic response of the overall system and (2) what is the three-dimensional stress field in such component? The paper is organized as follows. First, the modal reduction approach used in this work is introduced and its use in the framework of the local frame formalism implemented in Dymore is discussed. Then, a numerical application is presented: a rotating swashplate modeled with three-dimensional finite elements in ANSYS R Academic Research Mechanical, Release 18.2 is treated via modal reduction and used for the numerical simulation of a UH-60 rotor.

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  Modal Reduction of Fatigue Sensitive Components for Comprehensive Rotorcraft Dynamics Simulation

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