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http://dx.doi.org/10.5139/JKSAS.2007.35.6.503

Aeroelastic Analysis of Bearingless Rotor Systems in Hover and Forward Flight  

Lim, In-Gyu (한국과학기술원 항공우주공학과 대학원)
Lee, In (한국과학기술원 항공우주공학과)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.35, no.6, 2007 , pp. 503-508 More about this Journal
Abstract
In this study, the aeroelastic response and stability of bearingless rotors are investigated using a large deflection beam theory. The outboard main blade, flexbeam, and torque tube are all assumed to be an elastic beam undergoing arbitrary large displacements and rotations. The finite element equations of motion obtained from Hamilton's principle. Two-dimensional quasi-steady strip theory is used to evaluate aerodynamic forces. In hover, the modal approach method based on coupled rotating natural modes is used for the stability analysis. In forward flight, the nonlinear periodic blade steady response is obtained by integrating the full finite element equation in time through a coupled trim procedure with a vehicle trim. The results of the full finite element analysis using the large deflection beam theory are compared with those of a previously published modal analysis using the moderate deflection-type beam theory.
Keywords
Bearingless Rotors; Aeroelasticity; Large deflection; beam; geometic nonlinearity;
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  • Reference
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