Stiffened Composite Panel Design • Based on “Improved genetic algorithm for the design of stiffened composite panels,” by Nagendra, Jestin, Gurdal, Haftka, and Watson, Computers and Structures, pp. 543-555, 1996. • Standard genetic algorithm did not work well enough even with simplified structural model (finite strip). • Algorithm was improved based on simplified version of the panel design problem (e.g. fixed blade height, single laminate).
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Stiffened Composite Panel Design Based on Improved genetic algorithm for the design of stiffened composite panels, by Nagendra, Jestin, Gurdal, Haftka,
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Stiffened Composite Panel Design
• Based on “Improved genetic algorithm for the design of stiffened composite panels,” by Nagendra, Jestin, Gurdal, Haftka, and Watson, Computers and Structures, pp. 543-555, 1996.
• Standard genetic algorithm did not work well enough even with simplified structural model (finite strip).
• Algorithm was improved based on simplified version of the panel design problem (e.g. fixed blade height, single laminate).
Geometry and loading
20,000 /
5,000 /x
xy
N lb in
N lb in
Modeling in PASCO• Finite strip model assume that in one direction we
can use sine solution, while in the other the displacement can have general shape.
• Panel Analysis and sizing code (Stroud and Anderson) based on analysis code by Wittrick and Williams.
Optimization problem
• Minimize the weight of the panel
• Design variables ply angles of skin (), ply angles of blade ()and flange (same), blade height.