HM-4655: Create and Modify a Seatbelt

Tutorial Level: Advanced In this tutorial you will create a seatbelt system and all related solver seatbelt entities.

Before you begin, copy the file(s) used in this tutorial to your working directory.
Figure 1.

Load the LS-DYNA Profile

In this step you will load the profile.

  1. Start HyperMesh.
  2. Set the Profile to LsDyna.

Load the Model

In this step you will load the model file.

  1. From the menu bar, click File > Open > HyperMesh Model.
  2. In the dialog, open the seat_model_hm2020.hm file.
The model opens in the modeling window.

Create a Seatbelt Include File

In this step you will create a seatbelt include file.

  1. In the Model Browser, right-click and create a new Include file.
  2. Double-click the Include file.
  3. In the Include view of the Model Browser, rename the Include file to Seatbelt.k.

Create the Seatbelt Mesh

In this step you will create a seatbelt mesh.

  1. From the Safety ribbon, click the Seat Belt tool.
    Figure 2.


    The Seatbelt Browser opens.
  2. In the Seatbelt Browser, right-click and select Create > SeatbeltSystem > Manual.
    A seatbelt system is generated with three seatbelt segments.
  3. Select the root of the SeatbeltSystem to activate the Entity Editor.
    Figure 3.


  4. In the Entity Editor:
    1. Select Wrap Around: Components. Select cushion, UPPER TORSO, LOWER TORSO, PELVIS and LINK.
    2. Activate the Create Contact option to automatically generate the contacts between belt and wrap around components.
    3. Change the 2D Element Size to 10.0.
  5. In the Seatbelt Browser, select seatbelt1 to activate this seatbelt segment.
  6. In the Entity Editor for seatbelt1:
    1. Keep the mesh type of the seatbelt segment to 1D Seatbelt elements only.
    2. Activate the nodes selector and select the two nodes defined by the tags "Retractor" and "Slipring1" to define the belt path of seatbelt1.
      The seatbelt1 1D mesh is automatically generated.
      Figure 5.


  7. In the Seatbelt Browser, select seatbelt2 to activate the seatbelt segment.
  8. In the Entity Editor for seatbelt2:
    1. Keep the mesh type of the seatbelt segment to 1D & Shell elements.
    2. Activate the nodes selector and select the three nodes defined by the tags "Slipring1," "Orient-Torso," and "Slipring2" to define the belt path of seatbelt2.
      The seatbelt2 mesh is automatically generated.
      Figure 6.


  9. Repeat Step 8 for seatbelt3 by selecting nodes defined by "Slipring2," "Orient-Lap," and "Anchorage."
    The seatbelt3 mesh is automatically generated.
    Figure 7.


Interactive Modification of the Belt Path

In this step you will modify the belt path.

  1. In the Seatbelt Browser, select seatbelt3 and then right-click to open the context menu.
  2. Select Interactive modification.
  3. Select the seatbelt line path on the graphic, press and hold the left mouse button, and move the belt line upward to modify the belt path.
  4. Press Esc to terminate the process.
    Figure 8.


Create Solver Seatbelt Entities

In this step you will create solver seatbelt entities.

  1. In the Seatbelt Browser, select the control point named Point1 in seatbelt1.
  2. Right-click and select Create > Retractor.
  3. Click Create to create an *ELEMENT_SEATBELT_RETRACTOR at this location.
  4. In the Seatbelt Browser, select the control point named Point3 in seatbelt1.
  5. Right-click and select Create > Slipring 1D.
  6. Click Create to create an *ELEMENT_SEATBELT_SLIPRING at this location.
  7. Repeat Step 4 through Step 6 for Point5 to create another Slipring at this location.

Create Solver Cross-Section on the Seatbelt

In this step you will create a solver cross-section.

  1. In the Seatbelt Browser, select seatbelt2.
  2. Right-click and select Cross Sections.
  3. Set the Distance from Start and Distance from End to 150.0.
  4. Click Create.
    Two cross-sections are generated.

Review Entities Created in the Seatbelt Include File

In this step you will review entities created in the include file.

In the Include view of the Model Browser review the entities created during the seatbelt creation process.
Figure 9.