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发表于 2014-11-11 09:12:23
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来自 湖北武汉
The results of iteration 0 in an attempted topology optimization are different from the results of a run with ANALYSIS. What is wrong?
Nothing is wrong. You have defined a design space for your topology optimization. In an analysis-only run, the density of the design space is set to 1.0. In the first iteration of the topology optimization, the density of the design space is less than 1.0, unless you have expressly set the MATINIT value, defined on the DOPTPRM bulk data entry, to 1.0. Therefore, in the first iteration, the structure appears to be not as stiff as in an analysis-only run.
For topology optimization runs with mass (volume) as the objective, the default for MATINIT is 0.9. For runs with constrained mass (volume), the default is reset to the constraint value. If mass (volume) is not the objective function and is not constrained, the default is 0.6.
To perform an analysis only run with the modal parameters set to the values that will be used for the first optimization iteration, do not use the ANALYSIS command, and set MAXITER = 0.
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