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. Squeak Evaluation

Use the Review E-Line dialog to:
  • View all E-Lines in the model. E-Lines are split by type (Rattle, Squeak, and All) under the sub tabs. Each sub tab exposes only the relevant parameters for the selected type.
  • Edit and update E-Line parameters for single or multiple E-Lines (see Manage E-Lines Options).
  • Create interface names on the fly, review and update gap and tolerance values for interfaces, or map interface names from an imported DTS file.
  • Map materials from Stick-Slip DB 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.
    Figure 4.


  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 or update a parameter for a realized E-Line, the line status changes to modified (blue) or unrealized (yellow). For such changes, you will have to realize the updated line. See Manage E-Lines Options for more information.
  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 cannot be edited and will be set and controlled automatically. The smallest E-Line ID is 10000.

Stick-Slip DB

Stick-Slip testing provides compatibility information for material pairs and supports squeak assessment in post-processing of E-Lines (Squeak Evaluation).

The idea behind mapping materials from Stick-Slip DB is to incorporate testing data without interfering with the materials of the FE model.

To map material pairs to the squeak lines, three options are available:
  • Extract all material compatibility information from Stick-Slip DB on AMDC.
  • Use the built-in DB from Squeak and Rattle Director to get (impulse rate)-1 values.
  • Input data from in-house testing.
  1. From the SnRPre ribbon, Setup group, select the Review E-Lines tool from the Manage E-Lines tool group.
    Figure 5.
    The Review E-Line dialog opens.
  2. Select the Stick-Slip DB tab.
    Figure 6.


  3. Click to open an existing Stick-Slip DB file.
  4. Click to export a .csv file once created.
  5. Click to add material pairs from Stick-Slip DB on AMDC.
    Learn more in Stick-Slip DB on AMDC.
  6. Click to add material pairs from built-in DB on Squeak and Rattle Director.
    1. For Main and Secondary Material, select a Type, Manufacturer, and Brand.
    2. Click to add the selected material pair to the Stick-Slip.
      Figure 7.
      Note: Type is the only mandatory input. Manufacturer and Brand can be left blank if unknown. Furthermore, not all material combinations have a match, some combinations do not have a risk of squeak. The Impulse Rate range for these is 100-100.
  7. Click to add material pairs from in-house testing.
    Note: Only Material 1/Material 2 names and Inv(IR) are mandatory for further assessment. Other information is for awareness only and can be left blank if not available.
  8. Return to the Overview tab and map the material pairs to the squeak E-Line under the Material Pair column.
    Figure 8.


Manage E-Lines Options

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

Status
Contains the E-Lines realization status
: realized E-Lines.
: unrealized E-Lines. If the columns Type, Gap Direction, Spacing, and Search Distance are modified, the E-Line status changes to unrealized, meaning that the FE-entities will be recreated once the E-Line is realized.
: modified E-Lines. If the columns Interface Name, Gap, Tolerance, Inv(IR), and Contact type are modified, the E-Line status changes to modified and there will be no impact on the FE-entities once the E-Line is realized.
: failed 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.
Figure 9.


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.
Material Pair
Mapped Material Pair from Stick-Slip DB to the E-Line.