Optimization of the wing unloading of a medium-range passenger aircraft

Аuthors

Gusev V. G.

Saint-Petersburg State University of Civil Aviation, 38, Pilotov str., St. Petersburg, 196210, Russia

e-mail: prep424@mail.ru

Abstract

The features of a wing design of the modern medium-range passenger aircraft are considered. The main design deficiency of the classical single-fuselage scheme of the aircraft influencing the mass of a wing is the centrally located fuselage. The significant bending moment evolving thus in the wing root section is defining in weight calculations of its design. The configuration version of the twin-fuselage passenger airplane with a passenger capacity, identical with the single-fuselage airplane prototype, is offered. One of features of such configuration of the aircraft is presence of two instead of one fuselages with the pressurized cabins isolated from each other allowing single-level placement of passengers in salon at four chairs in the same row in each fuselage. This circumstance in addition to a flight safety and creation of more comfortable conditions for passengers allows to considerably increase unloading of a wing and reduce the bending moment in root section and the mass of its design. The power plant with three engines located on the wing of the plane creates additional benefits in comparison with the two-engine power plant at a possible engine failure. The four-leg fuselage undercarriage with two nose and two main legs also promotes increase of flights safety level in case of landing with a non-extended landing gear. The method of approximate calculation of a wing mass construction on the area of the bending moments diagram is offered. It is accepted, that the distributed mass loading of the wing design is function of the cross section area of wing bulkhead frame and normal stress is equal to the allowable stress. On the basis of the developed method the comparative estimate of a wing mass for the airplane-prototype and the twin-fuselage airplane scheme is made. Results of calculations confirmed efficiency of the wing unloading by fuselages removed from each other. The wing mass of the twin-fuselage plane appeared much less than a wing mass of the classical single-fuselage plane.

Keywords:

wing, bending moment, mass of a design, twin-fuselage plane scheme

References

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