22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-4.11.R2

A POINT OF VIEW REGARDING TO DYNAMIC ANALYSIS OF AN AIRCRAFT STRUCTURE

I. Fuiorea, M. Stoicescu
Military Technical Academy, Bucharest, Romania

Keywords: tailboom, helicopter, maintenance

The main purpose of the work was to study the dynamic answer of the tailboom of the helicopter “ALOUETTE III” with respect to the unbalanced opposed airscrew. The study was necessary to improve the regulations of maintenance of the helicopter that operates for Romanian Airforce. Both modal analysis and harmonic analysis were done. In order to investigate different cases of boundary conditions and geometry solutions (for different versions of the helicopter) the authors considered first the numerical way of study. The numerical simulation of dynamic behavior of the tailboom was done by using finite element method. Finally, for the representative cases, the authors performed some experimental determinations for numerical result validation. During the numerical simulation the authors tested different types of elements, from compatibility point of view, and different methods for nonlinear dynamical calculations, from convergence point of view.

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