OptiStruct has the capability of performing size optimization. Size optimization can be performed simultaneously with the other types of optimization.
In size optimization, the properties of structural elements such as shell thickness, beam cross-sectional properties, spring stiffness, and mass are modified to solve the optimization problem.
Defining size variables in OptiStruct is done very similarly to other size optimization codes. Each size variable is defined using a DESVAR bulk data entry. If a discrete design variable is desired, a DDVAL bulk data entry needs to be referenced for the design variable values. The DESVAR cards are related to size properties in the model using a DVPREL1 or DVPREL2 bulk data entry. Each DVPREL bulk data entry must reference at least one DESVAR bulk data entry to be active during the optimization. HyperWorks includes a pre-processor called HyperMesh that can be used to set up any number of size variables for the properties.
The following responses (see Responses for a description) are currently available as the objective or as constraint functions:
|
Mass |
Volume |
Center of Gravity |
|
Moment of Inertia |
Static Compliance |
Static Displacement |
|
Natural Frequency |
Buckling Factor |
Static Stress, Strain, Forces |
|
Static Composite Stress, |
Frequency Response Displacement, Velocity, Acceleration |
Frequency Response Stress, Strain, Forces |
|
Weighted Compliance |
Weighted Frequency |
Combined Compliance Index |
|
Function |
|
|
Go To
Design Variables for Size Optimization
Example Problems for Size Optimization
See Also