VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University892910.18287/2541-7533-2021-20-2-45-52Optimal design of sandwich floor panels made of high-strength composite materials considering stiffness constraintsKomarovV. A.<p>Doctor of Science (Engineering), Professor of the Department of Aircraft Construction and Design, Chief of the Research and Educational Center <br />for Aircraft Construction (AVICON)</p>vkomarov@ssau.ruPavlovaS. A.<p>Engineer of the Research and Educational Center for Aircraft Construction</p>pavlova-sva@yandex.ruSamara National Research University0907202120245520807202108072021Copyright © 2021, VESTNIK of Samara University. Aerospace and Mechanical Engineering2021<p>The article considers the challenge of designing sandwich floor panels made of high-strength composites considering stiffness constraints. A dimensionless criterion is proposed for assessing the stiffness of floor panels. A new constraint equation determines an interrelation between geometrical parameters of composite constructions and a given criterion. A demo example and the results of designing a typical floor panel using a high-strength composite material are presented. The mass of a square meter of the structure is considered as an objective function, and the thickness of the skin and the height of the honeycomb core of a sandwich construction are considered as design variables. In order to find the optimal ratio of design variables, a graphical interpretation of the design problem is used considering strength and stiffness constraints in the design space. It is noted that the presence of restrictions on a given value of the permissible relative deflection leads to an increase in the required height of the honeycomb filler with an insignificant consumption of additional mass of the sandwich construction.</p>Sandwich constructionsfloor paneldesignstrengthstiffnessdeflectiongraphical interpretationТрёхслойные конструкциипанель полапроектированиепрочностьжёсткостьпрогибграфическая интерпретация[Komarov V.A., Kutsevich K.E., Pavlova S.A., Tyumeneva T.Yu. Optimization of honeycomb sandwich floor panels made of polymer-matrix low-combustible composite materials based on high-strength carbon and glass fibers and adhesive binder. Vestnik of Samara University. Aerospace and Mechanical Engineering. 2020. V. 19, no. 3. P. 51-72. (In Russ.). DOI: 10.18287/2541-7533-2020-19-3-51-72][Astakhov M.F., Karavaev A.V., Makarov S.Ya., Suzdal'tsev Ya.Ya. Spravochnaya kniga po raschetu samoleta na prochnost' [Aircraft strength calculation reference book]. Moscow: Gosudarstvennoe Izdatel'stvo Oboronnoy Promyshlennosti Publ., 1954. 648 p.][Bitkin V.E., Zhidkova O.G., Komarov V.A. Сhoice of materials for producing dimensionally stable load-carrying structures. Vestnik of Samara University. Aerospace and Mechanical Engineering. 2018. V. 17, no. 1. P. 100-117. (In Russ.). DOI: 10.18287/2541-7533-2018-17-1-100-117][Komarov V.A., Pavlova S.A. Programma Honeycomb_Opt graficheskoy interpretatsii zadach optimal'nogo proektirovaniya trekhsloynykh konstruktsiy [Honeycomb_Opt program for graphic interpretation of optimal design problems for three-layer structures]. Certificate of state registration of the computer program 2021610707RU. Posted 01.11.2021; published 01.19.2021.]