19.16.2. Define Primary Criterion for a Harmonic Response Analysis

To specify a Primary Criterion object under the Solution object for a Harmonic Response analysis:

  1. Select the Solution object and then select the Primary Criterion option from the Solution Context tab, or right-click the Solution object and select Insert > User Defined Criteria > Primary Criterion.

  2. Select the desired Scoping Method. Options include:

    • Geometry (default): Displays an associated Geometry selection property you use to select a geometric entity using the Vertex, Edge, Face, or Body selection options.

      Important:  This scoping only supports 3D flexible bodies.

      Note:  If specified, Point Mass, Distributed Mass, and Imported Condensed Parts are ignored.

    • Named Selection: Displays an associated Named Selection property you use to select an available user-defined Named Selection.

    • Remote Point: Displays an associated Remote Point property you use to select an available user-defined Remote Point.

    • Boundary Condition: Displays an associated Boundary Condition property you use to select either a Remote Force, Moment, or a Remote Displacement (the three supported boundary conditions).

  3. From the Base Result property, select the type of nodal vector field from which the extraction occurs. Property options for this analysis type include:

    • Displacement

    • Velocity

    • Acceleration

  4. No action is required for the Coordinate System property. This property is read-only and set to Global Coordinate System.

  5. Specify the component from which to extract node values using the Component Reduction property. Options include:

    • X/Y/Z (3D Only)

    • Magnitude

    • Face Normal (3D Face Selection Only)

    • Directional

      If you specify Directional, the Define By property displays. Options for the property include:

      Component: When you select Component, the X/Y/Z (3D Only) Component properties display. Set the value of these properties as either 0 or 1 in order to define the direction(s) of interest. For example, specifying 1,0,0 for the components corresponds to a reduction in the X direction.
      Direction Selection: When you select Direction Selection, the Direction property displays. Use this property to specify a direction by selecting an entity on the model.

  6. Using the Spatial Reduction property, specify a desired computation method to produce a scalar value from the vector field on multiple nodes for each frequency. Options include Average (default) and Absolute Maximum.

  7. Specify the properties of the Frequency Reduction category. Properties include:

    • Frequency Reduction: This is a read-only property set to Average.

    • Frequency Range: You use this property to define a desired frequency range. This produces a scalar value from the vector field on multiple frequencies. Options include Use Parent (default) and Manual. The Use Parent option uses the entire frequency range of the analysis or you can use the manual option and specify a range. When you select the Manual option, the Minimum Frequency and Maximum Frequency properties display automatically so that you can enter values. These properties are read-only when you select the Use Parent option.

  8. After you solve the analysis, the read-only properties, Value and Discretization Error, display the calculated displacement, velocity, or acceleration as well as an estimate of discretization error. The discretization error result enables you to consider the quality of the chosen frequency spacing. You can parameterize this value.

See the Understanding the Criterion Calculations section for a description of the calculations used to obtain the criterion.