Design constraints in design optimization

Design constraints define your upper and lower limits on a specific solution output. You specify the output in a response. The constraint and its response put limits on what the solver can change in its attempt to meet the design objective. The optimization algorithm works in the scope of these limits as it changes design variables while attempting to meet your overall design objective.

For example, the XX-stress from all elements assigned to a specific physical property is a design response, and limiting these values to less than 20000 psi is a design constraint. The Z-displacement at a single node is a design response, and limiting this value to 0.1 mm is a design constraint.

You can include constraints and their associated responses in the solution or in any of the subcases. When included at the solution level, constraints can use only weight or volume responses. Typically, you will create constraints at the subcase level.

You can define multiple constraints.

The design constraint creates a DCONSTR bulk data entry in Nastran.

Where do I find it?

Application	Pre/Post
Prerequisite	A solution of type SOL 200 Design Optimization
Menu	Insert→Solution****Insert→Step-Subcase****Insert→Modeling Objects→Type=Design Constraint
Location in dialog box	Solution dialog box→Case Control tab→ (next to Design Constraints)Solution Step dialog box→ (next to Design Constraints)

How do I

Create design constraints and responses

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

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Design constraints in design optimization, Simcenter 3D 2021.1 Series

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