City Research Online

Abstract

This work considers the fuselage/main rotor coupling nonlinear dynamics under a modal analysis study. The authors provide an advanced application and study of a simulation model that captures the complex fuselage/main rotor dynamics and validate it with previous existing theories. The model has been built up by using VehicleSim, software specialized in modelling mechanical systems composed by rigid bodies. The rotors are articulated, the main rotor considers flap, lag and feather degrees of freedom for each of the equispaced blades and their dynamic couplings. Once the validation is made, the main rotor angular speed is defined as time varying function such that heterodyning behaviour can be detected in the fuselage. The detection of this behaviour is not a simple task and this helicopter model provides an accurate system for its analysis using a short time Fourier transform processing.

Publication Type:	Article
Publisher Keywords:	Fuselage, Rotor, Modal Analysis, Heterodyning
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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