Overview
You can define User Defined Criteria using the Primary Criterion and Composite Criterion objects. These objects enable you to create scalar-based results on the mesh, or on the solution, of an upstream system. This permits you to quantify the performance of your current design. In addition, you can use the result data in a downstream Structural Optimization analysis as an Objective or as a Response Constraint. The User Defined Criterion options are available for the following:
Measures Object (computes geometric quantities on the mesh)
Depending upon your application (mesh or solution), the Primary Criterion object enables you to:
Select a base result, such as mass, displacement, or reaction force.
Set scoping options to generate the scalar value for an entity of interest (body, remote point, boundary condition, etc.).
Note: Based on how you specify criterion, using the Measures object or from the solution of the upstream system, a prefix is added to the available options to indicate their source, either "Meas:" or the analysis designation, such as "A5," "B5," etc.
To create more complex criterion, you can combine multiple scalar criteria (Primary Criterion objects) into a single scalar value using the Composite Criterion object/option.
See the Understanding the Criterion Calculations section for a description of the calculations used to obtain the criterion.
Application and Background
The following sections describe the steps to specify the Primary Criterion, how to combine your results (via object) as well as the formulas used to calculate the criterion.
- 19.16.1. Define Primary Criterion for the Measures Object
- 19.16.2. Define Primary Criterion for a Harmonic Response Analysis
- 19.16.3. Define Primary Criterion for a Modal Analysis
- 19.16.4. Define Primary Criterion for a Static Structural Analysis
- 19.16.5. Combine Primary Criterion Objects
- 19.16.6. Understanding the Criterion Calculations