Configuring the Stress Ratio Technique

The Stress Ratio technique is a fully stressed design (FSD) method commonly used in structural optimization.

See Also
Stress Ratio Technique
Configuring the Technique and the Execution Options
  1. From the Flow section of the action bar, click Optimization and drop it on the process diagram.
  2. Double-click Optimization .
    The Optimization Editor appears.
  3. From the General tab's Optimization Technique list, select Stress Ratio.
  4. In the Optimization Technique Options area, enter the following:
    OptionDescription
    Maximum Iterations The maximum number of simulations to be performed by the optimizer. Integers greater than zero are accepted. The default value is 20.
    Power The β parameter used to control convergence of the algorithm. This must be a real value greater than zero and less than one. The default value is 0.4.
    Constraint Critical Ratio Control how satisfied constraints are handled. A value of 1.0 means that the associated dimension for any satisfied constraint is reduced according to the standard stress ratio equation. A value of 0.5 means that the dimension of a satisfied constraint will not be reduced until the actual/allowable value is less than 0.5. A value of 0.0 means that the dimension of a satisfied constraint will never be reduced.
    Tolerance The magnitude change in objective value between successive iterations that will cause the algorithm to stop. Real inputs greater than 0.0 are accepted. The default value is 0.0.
    Maximum Failed Runs The maximum number of failed subflow evaluations that can be tolerated by the optimization technique. If the number of failed runs exceeds this value, the optimization component will terminate execution. To disable this feature, set this option to any negative value (for example, –1). When this option is set to a negative value, the optimization will continue execution despite any number of failed subflow runs.
    Failed Run Penalty Value The value of the Penalty parameter that is used for all failed subflow runs. The default value is 1⁢  ×  ⁢1030.
    Failed Run Objective Value The value of the Objective parameter that is used for all failed subflow runs. The default value is 1⁢  ×  ⁢1030.
  5. Click Ok to save your changes and to close the Optimization Editor.