PRIMER 22.1

Advanced HBM Positioning using Ansys LS-DYNA

Advanced tool for Human Body Model Positioning using Ansys LS-DYNA

The Ansys LS-DYNA positioning for HBMs in PRIMER can be done using the same tool as for the Dummies.

Through using the PRIMER Ansys LS-DYNA positioning tool, an Ansys LS-DYNA analysis is created that will "pull" the dummy into the desired position.


For traditional ATDs/Dummies, these methods work well. However, it has been found that more complex HBMs could sometimes deform unnaturally while pulling the model assemblies into position. 

From PRIMER 22.0 onwards, users can select more than three positioning cable nodes on a HBM assembly.
The *ASSEMBLY definition for HBMs has been updated in the following ways:
  • The bitwise encoded dyna_pos field gives the details of the positioning cable nodes for the assembly
  • The nodes selected for each HBM assembly are now added into a *SET_NODE and the reference for this set is mentioned in the *ASSEMBLY card.

An advanced HBM positioning tool is available which can be used to “customise selection of nodes” on HBM assemblies to which the positioning cable elements can be attached.

Pressing the HBM Adv. toggle button maps an “advanced” panel for updating the positioning cable nodes.
The positioning cable nodes for each assembly can be defined via a selection panel. This selection panel shows only the “rigid” entities in the graphics window to allow easy picking of the positioning cable nodes.
You can select any number of nodes on a HBM assembly, and all these nodes get added in to a *SET_NODE entity.

Panel to process positioning cable nodes for HBMs

  1. The HBM Adv. button maps the “advanced panel” for updating positioning cable nodes. A preference controls whether the updated HBM panel is mapped by default: primer*hbm_use_new_cable_node_panel
  2. Even though some HBMs come with “encrypted” materials, PRIMER can still identify the “rigid” entities for the HBM by ticking this checkbox as ON. A preference controls the value of this button by default: primer*hbm_use_encrypted_mats_for_cables
  3. The Select button launches a panel to select the positioning cable nodes for that assembly.
  4. The Default button reverts the positioning cable nodes to the defaults defined in the original positioning tree.
  5. The Auto button automatically re-calculates up to three positioning cable nodes to attach cables on that assembly.
  6. Pressing the “I” button ignores that assembly for positioning cable nodes.
  7. Pressing the “R” button rigidifies that whole assembly.
  8. Using the check buttons on the left and the menus on the top of the assembly list, you can process positioning cable nodes on multiple assemblies simultaneously.



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