To increase number of design iterations for an Optimization run.
In OptiStruct, by default the number of iterations carried for an Optimization setup is 30. For few
models 30 iterations may not be sufficient to get a converged optimization results.
Follow the below procedure to increase the number of iterations for a optimization run….
Topic Objective: calculate Eigenfrequencies/ Eigenmodes with Gravity
When running analysis with low frequencies, Gravity will somehow have influence on the
structure. To include gravity while running normal modes analysis, please follow the below
RADIOSS has pre-defined rigid wall structures. But users may want to have a custom structure to be rigid.
HyperMesh with RADIOSS as solver has predefined rigid walls (infinite plate, sphere, prism, etc.). In order to make a custom structure to behave like a rigid, the general practice with a linear static or implicit background is to increase the Young’s modulus. But this should not be done when dealing with explicit analysis as this may increase the time step and also alters the stiffness of contact surfaces…..
Output results per each iteration after optimization run is complete.
After successful run of optimization HyperView will show the analysis results directly for the final
iteration. To get the results of every iteration request results from control cards….
Topic Objective: Remesh if optimization runs into element quality error
Sometimes the optimization run aborts due to element quality issue in the middle of the run
usually during shape, topography or free shape optimization. This is because of the element
quality issues. By activating the REMESH option in opti control, remeshing will be activated to
improve element quality if there is an element quality error is encountered. After the remesh, the
optimization will then continue based on the remeshed model.
To activate REMESH option: go to AnalysisOptimizationOpti control click next to next page
within the Opti Control panel and select REMESH. Enter “1”in the value filed to activate