Selecting a stop condition

Strategies on how to select a suitable stop condition are discussed.

This task shows you how to:

• Use the Command Syntax
• Selecting a stop condition in Tosca ANSA® environment
• Selecting a stop condition in Tosca Structure.gui

For most tasks it is not necessary to change the stop condition for bead optimization - especially not for BEAD_CONTROLLER because the main change is done in the first iteration (although this is difficult to see for the user). The default of 3 iterations for controller-based algorithm should normally not be changed.

For BEAD_SENSITIVITY the default NODAL_MOVE in OPT_PARAM is 10% (0.10) of the maximal allowed nodal optimization displacement. This implies that in most cases the maximum bead height should be reached in the 10th iteration. Nevertheless, the sensitivity-based algorithm usually improves the design remarkably until the 20th iteration. Therefore, this value is the default setting. For some difficult optimization problems where the convergence is bad, a lower NODAL_MOVE can be chosen and it is necessary to use more than 20 iterations.