Studing of the dimensionless criteria for estimating bulkhead’s weigh efficiency
Design, construction and manufacturing of flying vehicles
Samara National Research University named after Academician S.P. Korolev, 34, Moskovskoye shosse, Samara, 443086, Russia
The purpose of this paper is to present an overview of bulkhead design problems, which can be efficiently solved using a special non-dimensional criterion of load-carruing efficiency.
Nowadays optimization algorithm based on fully-stress design philosophy and employing variable density model, is used. Such algorithm provide means to generate optimal load-carrying scheme of structures, subject to a wide range of design constraints.
Reinforced bulkheads are usually located in the areas of perception of concentrated loads fr om the wing, empennage, landing gear, etc. In the case of a wide range of engineering solutions, it is extremely important to assess different load-carrying schemes of bulkheads. Previously, a special criterion called «the load-carrying factor» was used for assessment of bulkhead load-carrying schemes. The load-carrying factor is the dimensional value which limits its the applicability to some extent. Therefore, new non-dimensional criterion was introduced for assessment of load-carrying efficiency of different bulkhead structures and knowledge accumulation.
This article takes into consideration reinforced bulkheads, loaded with the bending moment. The values of novel non-dimensional criterion were studied for different boundary condition in this research work. It was defined an area of geometric parameters wh ere exists some engineering solutions more advantageous than traditional beam with the constant structural height.
The developed non-dimensional criterion of load-carrying efficiency was used in the practical task of finding optimal bulkhead load-carrying scheme for maneuverable aircraft with two specific cutouts for the engine compartment. The obtained load-carrying scheme present the possibility of reducing the structural weight by 19%.
The non-dimensional criterion have predictive opportunities for assessment of different bulkhead load-carrying schemes at early design stages.
Keywords:design, reinforced bulkhead, load-carrying scheme, loads, bending moment, load-carrying factor, non-dimensional criterion of weight efficiency
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