Generic Impact

Use the Genetic Impact tool for the creation of target points on structural parts, the automatic positioning of any type of impactors on the target points, 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.


Restriction: Only available in the LS-DYNA, Radioss and PAM-CRASH interfaces.

Marking

In the Marking workflow, three methods of target points creation are available.

Click on the guide bar.
Manual
Create target points by manual locations selection on the graphic area.
Import from file
Create target points by importing a .csv file containing the targets information.
Raster
Create target points by projecting a grid of points on the structural mesh.
At the end of the marking workflow, Design Points entities and their corresponding Structural Properties are created. Those entities can be found and edited in the browser.
Figure 2.


Manual Marking

Manual marking allows you to create Design Point entities at selected locations on a selection of components.
Click on the guide bar to define default positioning parameters.
Those are assigned to the created Design Points.
Figure 3.


Figure 4.


Import from File Marking

Import from file marking allows you to directly read a CVS file containing the information for the impact locations.
  1. Click on the guide bar and select the CSV file.
  2. Click Mark to automatically create the Design Point entities at the defined locations.
    Figure 5.


    Below is an example of a CSV file content:
    Figure 6.


Raster Marking

Raster marking allows you to create a grid of Design Points on selected components.

Click on the guide bar to define the size of the plane as well as the step size between the Design Points in X and Y directions of the planes.
Figure 7.


Figure 8.


Below is an example of a 300.0x300.0 plane size and a 50.0 design points step size:

Figure 9.


Positioning

After the creation of Design Points 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
Click on the guide bar.
Figure 10.


Figure 11.


Pre-Requisites on the Headform Model

This tool can position any type of impactors. A coordinate system at the center of the impactor with the X axis pointing in the impact direction must be defined and is used to position the impactor. Any velocity or forces on the impactor should be defined in the impactor model or in an external include referenced into the main file.

Positioning Methods

Automatic
Uses the positioning parameters defined in the Structural Property of each Design Point.
Target/Angles
Figure 12.


  • X: Rotation of the impactor along the coordinate system X-axis.
  • Y: Rotation of the impactor along the coordinate system Y-axis.
  • Z: Rotation of the impactor along the coordinate system X-axis.
  • Aiming Point
    • Target: The impactor will be positioned so that the local coordinate system X-axis of the impactor is aligned on the design point.
    • Contact: The impactor will be positioned so that the local coordinate system X-axis of the impactor is first aligned on the design point and then moved so that the first point of contact coincides with the design point.
  • Move-back Distance: Distance of motion applied on the impactor in the opposite X-axis direction.
Normal to Target
Figure 13.


The impactor will be positioned so that the local coordinate system X-axis of the impactor is aligned with the normal of the component at the Design Point location.

Move-back Distance: Distance of motion applied on the impactor in the opposite X-axis direction.

Export Solver Decks

This tool enables you to export ready-to-run solver decks for all of the impact locations, in a very short time. The tool will only calculate the transformations to apply on the impactor for each of the Design Points, depending on the selected positioning method, and add this information as include in the main model file.

Any other model or load case definitions, for example, contacts, loads and control cards, must be defined in the main file.
Main File
The user-defined main input deck, containing the include structure of the final model.
Impactor File
Impactor deck that the tool defines as include in the main file during the export.
Output Directory
Location where all of the solver decks for each impact location will be written out.

During the export process, the tool generates an additional include file containing the computed transformations to apply on the impactor and refer this include file inside the main file.