H. Rapp, R. Worndle

Modern helicopter rotor blades with non-homogeneous cross sections made from non-isotropic material require a highly sophisticated structural analysis. Variations in cross section geometry make this task of analysis still more complicated. The analytical engineering theory of bending cannot describe all effects which are necessary. These effects are restraint warping due to cross section variations, restraint transverse deformations due to different Poissons ratios etc. With the finite element method (with three-dimensional solid elements) such influences can be described. However the immense effort does not allow this method in general. Combinations of suited analytical methods with numerical FEM-based methods allow a cost effective and sufficient accurate analysis of these complicated structures. It is shown that in general the one-dimensional engineering theory of bending combined with two-dimensional theories for determining the cross section properties is sufficient to describe the structural blade behaviour. Tests show a good coincidence with the theoretical results.

17th European Rotorcraft Forum 1991, Berlin

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1991, 1991-08, 17th European Rotorcraft Forum Proceedings; S.629-638; 1991; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

rotor blades, helicopters

Bestellbar

1991