Extracting a single value from the set of results (load case filtering)

In the Load Extraction dialog box, the combination of your selections from the Result Type and Component lists, and your selection of nodes or elements determines the set of results for the load case filtering calculation. The options in the Operations group determine which single value from the set of results the software uses in the calculation. The software applies these options sequentially as follows:

1. Filters the set of results.

2. Takes the absolute value of the filtered results.

3. Applies the aggregation option.

Filtering options

To exclude values in the results set from the calculation, use the options in the Filtering list.

• To exclude values outside the range you specify, select Range.

• To exclude negative values, select Only Positive Values (> = 0).

• To exclude positive values, select Only Negative Values (< = 0).

For example, suppose your selections produce the following set of results: (3.4, 5.1, -2.7, 7.5, -4.6, -3.9, 2.0, 9.1, -3.3, -8.4)

If you select Only Negative Values (< = 0), the software excludes all the positive values. All other values remain under consideration for use in the calculation. Thus, the set of results becomes: (-2.7, -4.6, -3.9, -3.3, -8.4)

Absolute value option

To make all the values in the set of results that are left after filtering positive, from the Absolute Values list, select Yes.

Continuing the example, if you select Yes, the set of results becomes: (2.7, 4.6, 3.9, 3.3, 8.4)

Aggregation options

The options in the Aggregation list specify how the software obtains the single value from the remaining set of results.

• To pick the algebraic maximum value, select Maximum.Continuing the example, if you select Maximum, the software uses 8.4 in the calculation.

• To pick the algebraic minimum value, select Minimum.Continuing the example, if you select Minimum, the software uses 2.7 in the calculation.

• To use the arithmetic mean of the values remaining in the set of results, select Average.Continuing the example, if you select Average, the software uses 4.58 in the calculation.

• To use the arithmetic sum of the values remaining in the set of results, select Sum.Continuing the example, if you select Sum, the software uses 22.9 in the calculation.

Conversion box

You use the Conversion box to correct for incompatibility between the result type that you select for the working load, stress, deflection, and so on, and the result type the method requires.

The Conversion box is available when the software detects an incompatibility between the result type that you select and the result type the method requires. When the Conversion box is unavailable, you must use the Factor box to correct for any incompatibility.

When the software detects an incompatibility, it notifies you of the data that it needs to correct for the incompatibility. Consider the following examples:

Method	Result type	Incompatibility	Correction
In the Calculation - Method Selection dialog box, select Force vs Force (2D Convex Hull), which requires forces.	In the Load Extraction dialog box, from the Result Type list, select a stress result.	The Conversion box displays Conversion (Stress to Force - multiply by) because the software needs the area over which the stress acts.	Specify a value for the area in the Conversion (Stress to Force - multiply by) box. The software multiplies the stress result by this value.
In the Calculation - Method Selection dialog box, select Stress (1D Min Max), which requires stress.	In the Load Extraction dialog box, from the Result Type list, select a force result.	The Conversion box displays Conversion (Force to Stress - divide by) because the software needs the area over which the force is distributed.	Specify a value for the area in the Conversion (Force to Stress - divide by) box. The software divides the force result by this value.
In the Calculation - Method Selection dialog box, select Force vs Moment (2D Bounding Box), which requires a force and a moment.	In the Load Extraction dialog box, from the Result Type list, select a stress result.	The Conversion box displays Conversion (Stress to Force - multiply by) because the software needs the area over which the stress acts.	Specify a value for the area in the Conversion (Stress to Force - multiply by) box. The software multiplies the stress result by this value.
In the Load Extraction dialog box, from the Result Type list, select a force result.	The Conversion box displays Conversion (Force to Moment - multiply by) because the software needs the leverage distance at which the force is applied.	Specify a value for the area in the Conversion (Force to Moment - multiply by) box. The software multiplies the force result by this value.

You have a variety of options for specifying the value that the software uses to correct for incompatibility between the result type that you select for the working load, stress, deflection, and so on, and the result type the method requires. For example, you can:

• Type the value directly into the Conversion box.

• Extract the value from a measurement, beam section, or laminate definition.

• Define the value with an expression or field.

The following table shows the incompatibilities that the software detects and the correction that is required.

Dimensions of result type required by method	Dimensions of result type you selected
Stress	Force	Force per unit length	Strain	Length	Moment
Stress	Compatible	Divide by area	Divide by length	Multiply by stress	Not detected	Divide by volume
Force	Multiply by area	Compatible	Multiply by length	Not detected	Not detected	Divide by length
Force per unit length	Multiply by length	Divide by length	Compatible	Not detected	Not detected	Divide by area
Strain	Divide by stress	Not detected	Not detected	Compatible	Divide by length	Not detected
Length	Not detected	Not detected	Not detected	Multiply by length	Compatible	Not detected

Factor box

You use the Factor box to specify a multiplier that scales the result that the software uses in the load case filtering calculation as the working load, stress, deflection, and so on.

When the Conversion box is unavailable, you can also use the Factor box to do the following:

• Specify a multiplier that corrects for an incompatibility between the result type that you select as the working load, stress, deflection, and so on, and the result type that the method requires.

• Specify a multiplier that converts the units of the result that the software uses in the load case filtering calculation as the working load, stress, deflection, and so on, to the units of the failure load, stress, deflection, and so on.

Note:

To assist you in determining the correct multiplier when the Conversion box is unavailable, the Unit Information group appears.

For example, suppose that in the Calculation - Method Selection dialog box, you select Generic (1D Min Max) as the method. Because the software does not know how to interpret the dimensions and units for the numerical value that you enter in the Tolerance (tol) box on the Calculation Creation dialog box, the Conversion box is unavailable. Thus, you must use the Factor box to correct for any dimensional and unit incompatibilities, and, if desired, specify a multiplier that scales the result that the software uses in the load case filtering calculation.

You can, however, use a method with units to create a load case filtering calculation. Consider the following scenario for a model where you use the Stress (1D Min Max) method to extract stress results from elements. Assume that the units for the model are kilogram, millimeter, and second. Thus, the units for a stress result that the software uses in the load case filtering calculation is kPa.

Note:

These units may differ from the default units that the software uses to display stress results in post-processing.

In post-processing, suppose that you use the Identify Results command to determine that the units in the model for elemental stress are MPa.

To correct for the unit discrepancy, enter 0.001 in the Factor box. This value is the conversion factor between MPa and kPa.

Previewing values for the load case filtering calculation

To view the values that the software will use in the load case filtering calculation prior to solving for the calculation, in the Preview group, click Preview to Info Window.

After solving for the calculation, you can view the values that the software used in the load case filtering calculation by opening the calculation log. For instructions on how to open a calculation log, see Load case filtering results.

Where do I find it?

Application	Pre/Post
Prerequisite	An active load case filtering solution
Simulation Navigator	Calculations node→right-click a calculation→Edit
Location in dialog box	Inputs group→Inputs tab→Load Extraction

How do I

Create a load case filtering calculation

Create and solve a convex hull calculation

Learn more

Load case filtering calculations

Parent/child behavior in load case filtering calculations

Sources manager (load case filtering)

Quick links

Command reference

Pre/Post video examples

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Load Case Filtering method documentation

Extracting a single value from the set of results (load case filtering), Simcenter 3D 2021.1 Series

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