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Evaluating the model results

Evaluating the model results

Evaluating the model results

This is pretty incredible software for the price!  

I created a model of a Locost car (1"sq. steel tube frame) and am pleased with the results, the chassis stiffness in ft-lb/degree are reasonable.  I have a question about how to best evaluate the various views and output tables so that I can make the best choices in improving the design.  The problem would be very similar to evaluating the Bridge.fem static model in the sample directories.  I've done Rank&Color using Energy, Axis forces, Origin forces, etc. as well as View Internal Loads, etc. etc.  Which tools would one use to best decide what to do to improve the stiffness of the bridge and to do it in an efficient way, making as few changes as is practical?

Thanks for your help,

Dave Halseth

RE: Evaluating the model results

In my view, optimization is more an art than a science so there is no absolute answer to your question.  The strain energy output was actually introduced into CADRE software at the request of the automotive industry particularly those engineers engaged in chassis design so I would expect that would be one of the better tools to look at to see if some members are being overworked.  Of course, you also need to dump the loads (rank & color extended data output) to a spread sheet and do a quick combined stress analysis on the cross sections to check against margins. If you find some members with excessive margin and others with low margins, then that's a good indication too.

Jim Haynes

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