به نام خداوند جان و خرد

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GA Code Development - Summary

Motivations:

· Manufacturing a full composite wing or the whole body of an aircraft requires an optimum tailoring of the composite laminate

· Since the searching space involved is a large,  non-convex, discrete, and fuzzy the GA approach suites the goal more than other optimization schemes

· GA needs to be adapted to the composite tailoring area

Objectives:

Developing the GA code and studying the main terms in GA for adapting to composites like:

               Penalty functions                                   Population size                                     

               Initial population                                    GA operators

               Fitness Scaling                                       Stopping criteria

Results:

· A two part penalty (combination of Death-Dynamic penalties) was developed

· The best values of GA operators like mutation, cross over, elitism, etc. were defined and applied to the GA code.

· A new logarithmic stopping criteria was developed and applied

· A smart way of defining the initial population was invented

· The effect of population size was also studied.

Publications:

1) Abedian, A., Ghiasi, M.H., Dehghan-Manshadi, B., "An introduction to a new criterion proposed for stopping GA optimization process of a laminated composite plate", Journal of Aerospace Science and Technology (JAST), Vol. 3, No. 4, pp. 167-176, 2006.

2) Abedian, A., Ghiasi, M.H., Dehghan-Manshadi, B., "Effects of a linear-exponential penalty function on the GA's Efficiency in Optimization of laminated composite panel", International Journal of Computational Intelligence (IJCI), Vol. 2, No. 1, pp. 5-11, 2005.

3) Salehi, S. M., Abedian, A., "Effects of genetic Operators on the Optimum Tailoring of Laminated Composites Using GA", Proceeding of the 7th International Conference of the Iranian Aerospace Society, Tehran, Iran, 2008.

Jas39 Model

Motivations:

· As a test case for the GA code the model of Jas39 aircraft was chosen to be simulated and then manufactured

Objectives:

· Each major part of the aircraft is studied by one student:

              Nose (Amir)                                                              Wing (Vahid)                     

               Fuselage (Mohamed)                                               Tail (Samaane)

              Canard (Zahra)                                                          Loading-Xplane (Mohamed)

Jas39

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