On reaction determining in connections of combined lifting member and control surfaces of low aspect ratio
Deformable body mechanics
Аuthors
*, **Kazan National Research Technical University named after A.N. Tupolev, 10, Karl Marks str., Kazan, 420111, Russia
*e-mail: mktleulinov@kai.ru
**e-mail: amirjafarzade@mail.ru
Abstract
The article considers the combined structure, consisting of a lifting member and control surface, connected in three or more points, i.e. statically undefined manner. The reactions value of such structures is determined not so much by the external loading as by the displacement compatibility conditions of lifting member and control surface hinged to it. Thus, it matters how the structure is being modeled, and what design models are being employed. The issue of the interrelation of reactions in the control panels hinging nodes, obtained while modelling according to the beam and plate analogies at small aspect ratios is studied. It was established earlier that the difference in reactions, obtained with the rod and plate models, decreased with the structure aspect ratio increase. It was close to zero at medium and high aspect ratio. The presented article studies the issue on the interrelation of the reactions in the control panels hinging nodes, obtained while modelling according to the rod and plate analogies at small aspect ratio. The frontal (laying in the control surface plane) reactions are being evaluated. It was established, that with small aspect ratio the divergence of the rod and plate values of the frontal reactions depended greatly on the aspect ratio and relative thickness. With this, the less the aspect ratio, the greater the dependence from the relative thickness. The difference between the reactions decreases with the relative thickness increase.
Thus, there is no need to use the plate model while determining the reactions value in the control surface hinging nodes at the lifting member length to width ratio greater than two. If this ratio is less, this necessity occurs. With this, the less the aspect ratio, the more the need for the plate analogy.
Keywords:
lifting member, control surface, multi-member structure, reactionsReferences
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