Evaluation of mainline aircraft center section weight efficiency

A method for evaluating the mainline aircraft center section weight efficiency based on a mathematical model of a deformable solid body of variable density was developed. The criterion for the evaluation of structure weight efficiency is the dimensionless coefficient of the force factor assumed by V.A.Komarov. It is revealed that the maximum structural height of a theoretically optimal wing-to-fuselage connection elastic system in the horizontal plane of symmetry of the fuselage is equal to the half of the bending moment transmission length in the connection. The geometric characteristics of the wing-to-fuselage connection were obtained, allowing the realization of engineering solutions with a significant mass reduction in comparison with the constant structural height center section. The sensitivity analysis of the force factor coefficient is performed for different positions of the upper boundary of the design area.