Example: Minimizing the energy stiffness measure

The task for this example is to maximize the stiffness by minimizing the energy stiffness measure subject to a mass constraint of 35%.

This task shows you how to:

  • Varying prescribed displacements are assigned as shown in the figure below:

Minimizing the energy stiffness measure in Tosca ANSA® environment

  • Not yet supported by Tosca ANSA® environment.

Minimizing the energy stiffness measure in Tosca Structure.gui

  1. Choose Command > DRESP.

  2. Choose Type > ENERGY_STIFF_MEASURE.

  3. Select ALL_ELEMENTS in dropdown menu Elementgroup.

  4. To choose load case click Add LC. In the field Loadcase number enter 2.

  5. Choose Command > OBJ_FUNC.

  6. Click Add Dresp and choose the previously defined design response for energy stiffness measure:

SIMULIA Tosca Structure Parameter File

  • The resulting command in the parameter file look like follows: 

    DRESP
  ID_NAME    = ...
  DEF_TYPE   = SYSTEM
  TYPE       = ENERGY_STIFF_MEASURE
  EL_GROUP   = ALL_ELEMENTS
  GROUP_OPER = SUM
END_