Optimal design of equal-strength sandwich plates and shallow shells

1986 ◽  
Vol 22 (10) ◽  
pp. 952-956 ◽  
Author(s):  
A. D. Pantelev
Keyword(s):  
Optimal Design ◽  
Sandwich Plates ◽  
Shallow Shells ◽  
Equal Strength

OPTIMIZATION OF TRUSS STRUCTURES OF THE STANDART SERIES WITH CROSS GRIDS

2021 ◽  
pp. 70-81
Author(s):  
А.С. Марутян
Keyword(s):  
Comparative Analysis ◽  
Optimal Design ◽  
Bearing Capacity ◽  
Communication Systems ◽  
Truss Structures ◽  
Technical Solution ◽  
Equal Strength ◽  
Necessary And Sufficient ◽  
Patent Examination

Представлено конструктивно-компоновочное решение стержней Y-образных и Ψ-образных очертаний в фермах с перекрестной решеткой или фермах с перекрестной решеткой и полустойками (полуподвесками), техническая новизна которого подтверждена результатами патентной экспертизы. Универсальность этого решения для ферменных конструкций обеспечивает ту эффективность, с какой оно применимо к грузовым верхним поясам, грузовым нижним поясам или грузовым верхним и нижним поясам одной и той же решетки. Повышена степень унификации типовой фермы из прокатных профилей за счет использования в верхнем поясе расчетных сечений, принятых для нижнего пояса. При этом ресурсы несущей способности разнятся между ними не более чем на полтора процента, что обеспечивает необходимую и достаточную равнопрочность обоих поясов для их более рациональной унификации. Выполнен сравнительный анализ основных результатов решения вариантного и оптимального проектирования ферменных конструкций применительно к решеткам с двойными системами полураскосов и решеткам с одинарными системами раскосов. Выявлена перспективность применения нового технического решения в составе несущих и связевых систем различных зданий и сооружений. The structural and layout solution of rods of Y-shaped and Ψ-shaped outlines in trusses with a cross lattice or trusses with a cross lattice and half-posts (half-suspensions) is presented, the technical novelty of which is confirmed by the results of patent examination. The versatility of this truss solution is as effective as it is for load tops, load bottoms, or load tops and bottoms of the same grid. The degree of unification of a typical truss of rolled sections has been increased due to the use of design sections in the upper belt adopted for the lower belt. At the same time, the resources of the bearing capacity differ between them by no more than one and a half percent, which ensures the necessary and sufficient equal strength of both belts for their more rational unification. A comparative analysis of the main results of the solution of the variant and optimal design of truss structures as applied to gratings with double systems of half-braces and gratings with single systems of braces is carried out. The prospect of using a new technical solution in the composition of bearing and communication systems of various buildings and structures has been revealed.

Fiber-Reinforced Sandwich Plates Under Static Loads—Proposals for Their Optimization

1986 ◽  
Vol 108 (2) ◽  
pp. 152-158 ◽  
Author(s):  
H. A. Eschenauer ◽  
W. Fuchs
Keyword(s):  
Optimal Design ◽  
Composite Structures ◽  
Design Method ◽  
Sandwich Plates ◽  
Structural Members ◽  
Optimization Strategy ◽  
Static Loads ◽  
Conflicting Objectives ◽  
Sequential Linearization ◽  
Optimal Stiffness

In order to satisfy the permanently increasing specification demands on machines and plants, the structural members and units of the constructions have to be designed in an “optimal” way. Nowadays more and more composite structures are attaining such new fields of application where one-component materials are not able to fulfill the higher demands. Typical examples are light constructions with optimal stiffness at various loadings. In this paper, a detailed investigation of the deformation behavior of a simply supported sandwich plate under static loads is carried out. Then, an optimal design method is formulated as a nonlinear multiobjective optimization problem by adopting the two conflicting objectives “minimal deformation” at “minimal weight,” including a set of constraints. The application of an optimization strategy is shown by means of a special preference function and sequential linearization as optimizer. Finally, some results of this procedure are discussed concerning the optimal design of sandwich plates.

scholarly journals Optimal Design by Genetic Algorithm for Maximum Fundamental Frequency of Laminated Shallow Shells

1996 ◽  
Vol 5 (1) ◽  
pp. 096369359600500 ◽  
Author(s):  
Y Narita ◽  
M Itoh ◽  
X Zhao
Keyword(s):  
Genetic Algorithm ◽  
Optimal Design ◽  
Fundamental Frequency ◽  
Shallow Shell ◽  
Optimization Problem ◽  
Optimization Process ◽  
Laminated Shell ◽  
Shallow Shells

A genetic algorithm (GA) is applied to the optimization problem for maximizing the fundamental frequency of laminated shallow shells. A frequency formula is derived for the shallow shell supported by shear diaphrams, and is used in the GA optimization process. The advantage of using GA approach in the laminated shell problem is demonstrated.

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