The example has been tested with ANSA 12.1.4. For newer versions of ANSA please refer to the tutorial 9-optimizing_with_LSOPT.pdf which is distributed with ANSA.
This example presents the coupling of LS-OPT with a pre-processor (ANSA). There are four steps needed to connect ANSA with LS-OPT:
- Model Definition
- morphing boxes
- morphing parameters
- parameters from ANSA Card entities
- Task Manager Sequence Definition
- design variables for morphing parameters
- design variables for ANSA parameters
- session commands
- design variables and FE output files
- µETA post set up
- response extraction
- LS-OPT setup
- design variables
- objective function
In order to perform the first two steps the user should be familiar with the functionality of ANSA and the Morphing Tool.
A front rail will be tested in crash simulation. The target is to find the best arrangement of its embosses in order to minimize the acceleration that appears in the test. As constraints are used the mass of the rail and the intrusion. These constraints must be kept within a specific range.
The design variables are:
A first run of the nominal case (the rail without the embosses) can give an estimation of the values of acceleration, mass and intrusion. All measurements took place at a reference point as shown at the picture on the right. Output results have been created for this position which are written in the d3thdt result file of LS-DYNA.
The values from the nominal run are:
The boundaries for the constraints are: