Manage E-Lines

Use the Manage E-Line tool to review and manage E-Lines.

Before you begin, E-Lines must be created. If E-Lines are already realized in Create E-Lines, this step is optional.
The Manage E-Lines tool is used to realize and edit E-Lines. Realize all E-Lines at once or switch to manual mode to realize and edit E-Lines one by one.

At realization, the finite element entities at each evaluation point will be created. You can also review and edit all E-Lines in bulk in the Review E-Line dialog.

The manage E-Line workflow is designed to facilitate rapid E-Line realization and editing for all users. There are two workflows in this tool:
Realize and Edit E-Lines
Realize, review, and update interface parameters for one E-Line at a time.
This workflow can be used on both realized and unrealized E-Lines.
Review E-Lines
Use the Review E-Line dialog to review, edit, and update parameters for all E-Lines and to map material compatibility data to squeak lines.

Realize and Edit E-Lines

Review, edit, and update interface parameters for one E-Line at a time.

This workflow can be used for both realized and unrealized E-Lines.
  1. From SnRPre ribbon, Setup group, select the Manage E-Line tool.
    Figure 1.
  2. From the guide bar, select an evaluation type:
    • All E-Lines
    • E-Lines of a specific type (squeak or rattle)
    • Unrealized E-Lines
  3. Manually select an E-Line from the modeling window or use the arrows on the guide bar to review and edit one E-Line at a time.
  4. Optional: Manually edit or update the parameters if needed.
    Figure 2.
  5. Complete one of the following options:
    • Click to realize E-Lines and remain in the tool.
    • Click to realize E-Lines and exit the tool.
    • Click to exit the tool without realizing E-Lines.
    Note: Before proceeding to next step, all E-Lines should be realized and the necessary parameters should be updated.
    Unrealized E-Line(s) will be realized and, if they are edited, parameters will be updated. FE-entities representing the E-Line will be created.

Review E-Lines

Use the Review E-Line dialog to review, edit, and update parameters for all E-Lines and map material compatibility data to squeak lines.

Use the Review E-Line dialog to complete the following:
  • View all E-Lines in a model.
  • Edit and update E-Line parameters for single or multiple E-Lines (see Manage E-Lines Options).
  • Review and update gap and tolerance values for interfaces or map interface names from an imported DTS file.
  • Map materials to squeak E-Lines.
  1. From the SnRPre ribbon, Setup group, select the Review E-Lines tool from the Manage E-Lines tool group.
    Figure 3.
    The Review E-Line dialog opens.
  2. Click to delete the selected E-Lines from the model.
  3. Click to realize the selected E-Lines in the model.
    Note: When you edit and update a parameter for a realized E-Line, the line status changes to unrealized. For such changes, you will have to re-realize the updated line.
  4. Click to renumber the selected E-Lines.
    1. Specify an interval.
    2. Click to renumber the selected E-Lines.
    3. Click to close the renumbering workflow.
    Note: The last four digits of an ID can not be edited and will be set and controlled automatically. The smallest E-Line ID is 10000.

Map Materials

To map materials, you can use the existing template materials or extract information from Ziegler PEM Material Database.

Existing template materials and information from the Ziegler PEM Material Database contain data referring to pairs of material and their compatibility. This data is obtained by stick-slip testing and is used in evaluation of the squeak simulation (Squeak Evaluation).

The idea behind mapping materials is to incorporate information coming from the material database, without interfering with the cards of existing materials of the model. You must associate materials of parts at the interfaces you want to study to materials in the database. This is done to assign stick-slip testing results to an E-Line which is then used in post-processing of the E-Lines for squeak evaluation.

  1. From the SnRPre ribbon, Setup group, select the Review E-Lines tool from the Manage E-Lines tool group.
    Figure 4.
    The Review E-Line dialog opens.
  2. Select the Material Mapping tab.
  3. Map material using template values.
    1. Assign the Main Material and Secondary Material for each squeak E-Line.
      Note: Not all material combinations have a match, some combinations do not have a risk of squeak. The Impulse Rate range for these are 100-100.
  4. Map material using user-defined Material Compatibility Matrix.
    1. If necessary, import the material file.
    2. Assign the Main Material and Secondary Material for each squeak E-Line.
  5. Map material using data from Ziegler Database.
    1. In the Material Mapping tab, click .
    2. Select one or multiple E-Lines.
    3. For Main and Secondary Material, select a Type, Manufacturer, and Brand.
      Figure 5.
    4. Click to map the selected material pair to the selected E-Lines.
      Figure 6.

Manage E-Lines Options

The following options are available in the Review E-Line dialog.

Status
Contains the E-Lines realization status
- Unrealized E-Lines
- Realized E-Lines
- Failed to realize E-Lines. Increasing search distance typically resolves failed E-lines. If this is not the case, use the connector browser for detailed error handling and advanced control to fix problem.
E-Lines ID
A unique ID for each E-Line along with the number of connections for respective E-Lines (last digits).
Type
Defines what type of phenomena to evaluate along the line – rattle or squeak.
Interface Name
Enter a name or assign from imported DTS file (if used) to respective E-Line in model to map the GD&T data.
Gap
Gap value for the interface in the specified gap direction. This is defined based on the Gap assignment method.
Tolerance
Design tolerance for gap in the specified gap direction. This is defined based on the Gap Assignment method.
(Impulse Rate)⁻¹ range
Inverse of Impulse Rate range is a measure of the material pair compatibility. This is defined based on the material mapping and only applies to Squeak lines.
Contact Type
Define Contact type for the E-line. This is based on Youngs' modulus value of the Main and Secondary FE material.
Gap Direction
Realization Projection direction that controls creation of the local coordinate systems which determines the Gap direction.
Spacing
Value for the spacing between two adjacent Evaluation Points on an E-Line.
Search Distance
Value for search / gap tolerance between the selected Main-Secondary component.
Main FE Material
Assigned FE material for main component in the E-Line.
Secondary FE Material
Assigned FE material for secondary component in the E-Line.
Main Material
Mapped Material from Stick-Slip testing for main component in the E-Line.
Secondary Material
Mapped Material from Stick-Slip testing for secondary component in the E-Line.