Settings for Sensitivity-Based Shape Optimization

The optimization procedure of the sensitivity-based optimization approach in SIMULIA Tosca Structure can be influenced by various settings.

See Also
Settings for Tosca Structure.shape
In Other Guides
Parameters for Sensitivity-Based Shape Optimization
OPT_PARAM

Filter

SIMULIA Tosca Structure uses a filter on the objective function sensitivities, the constraint sensitivities and the design variables to gain smooth results. The filter settings can be altered to either use another filter radius or to disable the filter. 


FILTER_RADIUS= <positive_real_value>, [ABS|REL]
The filter radius is used to filter the objective function sensitivities, the constraint sensitivities, and the design variables. The second parameter indicates if the radius is given in ABSolute units (default) or RELative (in terms of the medium edge length). Default value is 4 * medium_edge_length. To disable filtering, use 0 or any negative value. Using the FILTER_RADIUS=<value> parameter is equivalent to using the three parameters 

OPT_PARAM
 ID_NAME       = MY_OPT_PARAM
 OPTIMIZE      = MY_OPTIMIZE
 FILTER_SEN    = <value>
 FILTER_CONSEN = 0.5*<value>
 FILTER_DV     = 0.5*<value>
END_

It is also possible to set individual filter radii. For the objective function sensitivity filtering use 


FILTER_SEN= <positive_real_value>, [ABS|REL]
For filtering the sensitivities of the constraints, use 

FILTER_CONSEN= <positive_real_value>, [ABS|REL]
and for filtering the design variables use 

FILTER_DV= <positive_real_value>, [ABS|REL]