Release 11.0 Documentation for ANSYS
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TOVAR, Refname, Type, LOWER, UPPER, Boundtype
Specifies the objective and constraints for the topological optimization problem.
MP ME ST PR PRN <> <> <> <> <> <> PP <>
Reference name (8 character string), previously defined with TOCOMP and TOFREQ, or VOLUME (reserved name; default).
Valid types for this command are:
OBJ | — | Specifies the objective for the topological optimization problem. The Refname(s) specified must already be defined (TOCOMP,Refname, or TOFREQ) before defining your constraint(s). LOWER, UPPER, and Boundtype are not used if the specified Refname is the objective. To specify total volume as the objective function, use VOLUME as the Refname. For single or multiple compliance, see TOCOMP. For frequency formulations (single, weighted mean, reciprocal mean, or Euclidean normal), see TOFREQ. |
CON | — | Specifies the constraint for the topological optimization problem. Requires a previously defined objective function (TOVAR,Refname,OBJ). LOWER, UPPER, and Boundtype must be specified as listed below. |
DEL | — | Deletes the previously defined topological optimization objective or constraint named in Refname. LOWER, UPPER, and Boundtype are not used. |
Lower bound for the constraint (Type = CON).
Upper bound for the constraint (Type = CON). Default is no defined upper bound.
For Type = CON, specifies whether the specified bounds are actual values, or indicate percentages.
PERCENT | — | Indicates that the values specified in LOWER and UPPER should be treated as percentages of the original value. The original value is 100%; only values less than 100 are valid. Depending on the type of constraint, this value indicates a decrease or increase of the initial values. For example, specify 50 to reduce the volume by 50%, or specify 30 to increase the compliance by 30%. |
ACTUAL | — | Indicates that the values specified in LOWER and UPPER should be treated as actual values. |
You must set the objective first, then set the constraint(s).
If a single or multiple compliance function (see TOCOMP) is specified as objective function, only the VOLUME function is allowed as a constraint.
If a single, weighted mean, reciprocal mean, or euclidean norm frequency (see TOFREQ) objective is selected, only the VOLUME function is allowed as a constraint.
If the VOLUME function is selected as the objective function, then only a single or multiple compliance constraint (see TOCOMP) is allowed as constraint function. In this case, a multiple single compliance constraint definition is also possible. LOWER is not applicable if Type = OBJ or DEL, and is not used if Boundtype = PERCENT.
UPPER is not applicable if Type = OBJ or DEL. If Boundtype = PERCENT, and RefName = VOLUME, UPPER specifies the percentage of volume reduction. If Boundtype = PERCENT, and RefName is a single or multiple compliance function, UPPER specifies the percentage of compliance increase.
If Boundtype = PERCENT, the valid range for UPPER is [5%, 95%].
| Main Menu>Topological Opt>Set Up>Advanced Opt>Topo Objective |
| Main Menu>Topological Opt>Set Up>Advanced Opt>TopoConstraint>By Percentage |
| Main Menu>Topological Opt>Set Up>Advanced Opt>TopoConstraint>By Value |
| Main Menu>Topological Opt>Set Up>Advanced Opt>TopoConstraint>Delete |
| Main Menu>Topological Opt>Set Up>Basic Opt |