J.-S. Park, S. Jung, M.-K. Lee, J.-M. Kim

This paper constructs the design optimization framework for the composite wing of a tiltrotor aircraft based on the KARI (Korea Aerospace Research Institute) SUAV (Smart Unmanned Aerial Vehicle) TRS4 model. The present optimal design attempts to find the cross-section layout which minimizes the structural weight of a composite wing while satisfying a series of design constraints. The framework consists of various analysis and design tools that include a 2-D beam cross-section analysis, a whirl flutter analysis, and a 3-D strain/stress analysis under the worst wing-loading case. Variation of the wing sectional properties of tiltrotor aircrafts in the course of design optimization greatly affects the whirl flutter stability and exerts considerable influence on the structural integrity of the wing. In the framework, the whirl flutter stability is analyzed by the nonlinear flexible multibody analysis code DYMORE and the structural integrity is investigated using a MATLAB-based 3-D strain analysis module along with the previous load analysis result. MATLAB is used to conduct the optimization with a gradient-based optimizer and integrate all of the design and analysis tools. The nonlinear constraints associated with the aeroelastic stability and the structural integrity are also considered. For optimal design examples using the developed framework, a simplified cross-section model based on the KARI SUAV TRS4 composite wing is considered as an initial model. Design optimization examples are discussed to show the validity of the proposed framework and to illustrate the reduction of the structural weight of the composite wing. Through two examples, weight reductions of the wings of 26% and 40% are achieved while maintaining the whirl flutter stability margins.

35th European Rotorcraft Forum 2009,

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 2009, 2009-03, 35th European Rotorcraft Forum 2009 - Conference Proceedings; S.1-12; 2009; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

design optimization, wings, uas, rotorcrafts

Bestellbar

2009