Comment on "Minimum-weight design of an orthotropic shear panel with fixed flutter speed"

AIAA Journal ◽  
1984 ◽  
Vol 22 (5) ◽  
pp. 733-734
Author(s):  
Alexander H. Flax
Keyword(s):  
Minimum Weight ◽  
Minimum Weight Design ◽  
Flutter Speed ◽  
Weight Design ◽  
Shear Panel

scholarly journals Flutter Characteristic Study of Composite Sandwich Panel with Functionally Graded Foam Core

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Peng Jin ◽  
Xiaoping Zhong
Keyword(s):  
Sandwich Panel ◽  
Minimum Weight ◽  
Functionally Graded ◽  
Foam Core ◽  
Minimum Weight Design ◽  
Direction Parallel ◽  
Composite Sandwich ◽  
Flutter Speed ◽  
Design Variables ◽  
Weight Design

This paper attempts to investigate the flutter characteristic of sandwich panel composed of laminated facesheets and a functionally graded foam core. The macroscopic properties of the foam core change continuously along this direction parallel to the facesheet lamina. The model used in the study is a simple sandwich panel-wing clamped at the root, with three simple types of grading strategies for FGM core: (1) linear grading strategy in the chord-wise direction, (2) linear grading strategy in the span-wise direction, and (3) bilinear grading of properties of foam core across the panel. The results show that use of FGM core has the potential to increase the flutter speed of the sandwich panel. Finally, a minimum weight design of composite sandwich panel with lamination parameters of facesheet and density distribution of foam core as design variables is conducted using particle swarm optimization (PSO).

Minimum Weight Design of Ring Stiffened Cylinders Under External Pressure

1961 ◽  
Vol 5 (03) ◽  
pp. 44-49 ◽  
Author(s):  
George Gerard
Keyword(s):  
Yield Strength ◽  
Minimum Weight ◽  
External Pressure ◽  
Compressive Yield Strength ◽  
Minimum Weight Design ◽  
Weight Design

Minimum weight analyses for unstiffened and ring-stiffened cylinders under external pressure are presented for designs based on stability and compressive yield-strength considerations. The results for both types of cylinders are compared in terms of a common set of parameters to establish the efficiency of the stiffening system. The results are then compared on a somewhat different basis to establish the relative efficiencies of various classes of materials. Finally, certain conclusions are drawn of particular pertinence to deep submersibles.

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