Ejection Mitigation

Use the Ejection Mitigation (EM) tool for the automatic target marking according to FMVSS-226 rules, automatic positioning of the headform impactor, and the automatic export of ready-to-run solver decks for all of the selected impact locations.

The tool is accessible from the Safety ribbon. A pull-down menu provides a choice between the Marking and Positioning workflows.
Figure 1.


EM Marking

  1. Click on the guide bar to define marking options.
    Method
    Marking methods:
    Automatic
    The tool performs both vertical and horizontal orientation marking, as per the regulation.
    Horizontal
    Only horizontal targets are marked.
    Vertical
    Only vertical targets are marked.
    Front, Second row, Third row
    Selection of windows to consider in the marking process.
    Vehicle Axis
    Orientation of the vehicle -X or +X.
    Daylight Offset Distance
    Defines the offset distance, as per the regulation.
    Dx limit
    Minimal distance in X axis considered in the elimination process, as per the regulation.
    Dz limit
    Minimal distance in Z axis considered in the elimination process, as per the regulation.
    Absolute D Limit
    Minimal distance in case of additional target placement, as per the regulation.
    Apply Rules
    When activated, the target elimination process will be performed as per the regulation. Otherwise, the tool will only mark the 4 initial targets on the windows.
  2. On the guide bar, click and to navigate through the selections for the different windows and frames.
  3. Click Mark to start the target marking process.
    The tool will mark the windows and create the targets following the FMVSS226 regulation rules.
    Figure 2.


    Once the marking is done, a legend is accessible in the top-left corner of the modeling window. This legend offers checkboxes to activate/deactivate the visualization of the different targets calculated during the marking process:
    Active Targets
    Activates the visualization of the final targets resulting from the marking process (verticals or horizontals).
    Eliminated Active Targets
    From the type of active targets, verticals or horizontals, activates the visualization of the eliminated targets.
    Non-Active Targets
    Activates the visualization of the other type of targets not retained as final targets (verticals or horizontals).
    Eliminated Non-Active Targets
    From the type of non-active targets activates the visualization of the eliminated targets.

    Refer to the protocol for more details.

EM Positioning

After the creation of targets from the marking process, the Positioning workflow is used to:
  • Calculate the position of the impactor for all of the selected Design Points.
  • Visualize the position of the impactor.
  • Export ready-to-run solver decks for all of the selected Design Points.
  1. Click on the guide bar to define marking options.
    Vehicle Front Axis
    Orientation of the vehicle -X or +X.
    Door Side
    Defines the impact side.
    Move back Distance
    Distance between headform impactor and window.
    Customized Rotation
    If it is activated, it allows to provide a user-defined rotation to the headform.
    Transformation Type
    For LS-DYNA:
    • *NODE_TRANSFORM
    • *INCLUDE_TRANSFORM
    For Radioss:
    • /GRNODE
    • //SUBMODEL
    Main File
    File path to the main input deck to be used for the generation of the decks.
    Headform File
    File path to the headform input deck to be used as the include file in the main input deck.
    Output Directory
    Directory where all of the solver decks for the selected impact locations to be simulated will be created.
    Design Point name for the directories and include file name
    This option takes the name of the Design Point entity for the creation of subfolders and solver deck names.
    Create a folder for each design point in Export Directory
    When ON, this option creates a subfolder per the selected Target Points in the Output Directory location. When OFF, all main decks and includes are written in the Output Directory location.
  2. On the guide bar, click and to navigate through the selections to select:
    The Glass
    Is used to detect the contact point with the headform.
    The Headform
    All components defining the headform impactor.
    The Headform Coordinate System
    Will be used to position the headform on the target points. The X axis of the coordinate system will be aligned with the targets.
    Design Points
    The targets to be considered for the impact simulations.
  3. Click Position to visualize the position of the headform for all of the selected targets.
    Figure 3.


  4. Click Export to generate the ready-to-run solver decks for all of the selected targets.