[scilab-Users] Particular optimization

[Collette yann]

You just have to multiply the objective function by -1 to transform a 
minimization problem into a maximization one.

YC

Le 25/05/2010 14:11, paul.carrico at free.fr a écrit :
> Thanks for the so quick answer ...
>
> However I would like to MAXIMIZE and not minimize the stress mapping and I don't know if it's possible ...
>
> But i'll take a particular look on your example ...
>
> Speak to you soon
>
> Bye
>
> Paul
>
>
> ----- Mail Original -----
> De: "Collette yann"<yann.collette at scilab.org>
> À: users at lists.scilab.org
> Envoyé: Mardi 25 Mai 2010 14h06:46 GMT +01:00 Amsterdam / Berlin / Berne / Rome / Stockholm / Vienne
> Objet: Re: [scilab-Users] Particular optimization
>
> Hello,
>
> I joined to this mail an example of such a thing performed using code
> aster and scilab.
> The script to be launched is launch_optim.sce. Be careful, you will need
> to set up some paths in this script.
>
> The optimization problem is the following: optimize the shape of a truss
> bridge so as to minimize the deformation of the deck of the bridge.
>
> YC
>
> Le 25/05/2010 13:55, paul.carrico at free.fr a écrit :
>    
>> All,
>>
>> I would like to know if it’s possible or if somebody has ever experienced the following :
>>
>> a) is it possible to optimize a design in dynamic condition (in term of modal analysis and dynamic response i.e. dynamic stress) by looking for the MAXIMUM stress and not the minimum one as traditionally done,
>> b) I’m under windows (hard constraint !!) and is it possible to link a commercial FEA code to Scilab throughout a script for example for this optimization ?
>>
>> Please note I’ve about 6 different parameters to be optimized so that I've the maximum stress at the particular natural frequency.
>>
>> Any suggestion ?
>>
>> Regards
>>
>> Paul
>>
>>      
>