21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-R.4.7

PROBABILISTIC APPROACH FOR DESIGN OF A COMPOSITE RPV WING

Jacob K. A., Prabhakaran V., Saravanan P. M.
Aeronautical Development Establishment, India

Keywords: probabilistic, design, composite rpv wing

The probabilistic approach is used in design of a composite wing for a remotely piloted vehicle (RPV). The loads encountered during launch, flight and recovery phases of the aircraft has been analysed. The varied conditions of loading make it difficult to go by the maximum load conditions and fixed factor of safety concept. The probabilistic approach quantified by an additional factor of safety is employed for design. The orthotropic material design and the concept of isotropic compliance criteria for arriving at material orthotropy based on-the polar diagram of forces is proposed. The estimation of material allowables and a method for controlling the scatter based on sensitivity analysis is suggested. A multi design criteria based on strength, frequency and deformation limits is employed for the wing design. Finite Element Model analysis is carried out on selected structural configurations to arrive at the optimum design for minimum weight and to verify the design performance against the multi design criteria.

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