Human Body Model Settings

Created OnMarch 10, 2020

Last Updated OnOctober 7, 2024

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Human Body Model Settings

The GHBMC models, by default, have a specific numbering scheme corresponding to analogous body regions and instrumentation. The “Human Body Model Settings” window allows users to define the model type (e.g. M50-O, F05-OS, etc), version, unit system and the instrumentation numbering scheme.

Each time settings are modified in this window, they are saved into the programs cached settings. If the user closes the program, the settings from the previous session will be automatically loaded.

Model, version, and unit system information set in the “Human Body Model Settings” window is reflected in the bottom right corner of the main window status bar.

Model

Metriks currently supports the GHBMC 50th Percentile Male Occupant model (M50-O). Future releases will support additional models that can be toggled on this page.

Version

Metriks supports the following version(s) of models in the GHBMC family:

Model	Versions
M50-O	6.1, 6.0, 5.1.1, 5.0
M95-O	6.0, 5.1
F05-O	6.0, 5.1
M50-OS	2.3
M50-PS	5.3.5, 1.8
F05-PS	5.3.5, 1.8
6YO-PS	2.8.2

Unit System

Metriks supports calculations that ran LS-Dyna simulations in the following unit systems:

mm-kg-ms, mm-tonnes-sec

Instrumentation Numbering Scheme

The HBM instrumentation window reflects the current instrumentation numbering scheme that is used for model calculations. The numbering scheme is reflected in the GUI, and can also be saved to a text file, edited manually, and reloaded. Each time the user changes these settings they are stored into the program’s cache. Therefore, each time the user reopens the software, the most recent settings are loaded.

User Interface

The HBM instrumentation window includes a series of table panels to manually override default instrumentation numbering, as well as several additional HBM setting toggles. Descriptions of these instrumentation settings correspond to the graphic below. When the Model or Version is switched, the most recent settings for that model and version are automatically loaded.

① Nodes

Node ID numbers used for injury metrics and validation simulation outputs can be manually overridden by double clicking the input number. Nodal outputs often correspond to kinematic-based signals or injury metrics. If the user knows that the simulation was run with a consistent offset to the numbering of all Human Body Model node IDs, then that offset can be applied to all nodal output IDs in this table using the apply offset function below the table.

② Cross-Sections

Cross-section ID numbers used for injury metrics and validation simulation outputs can be manually overridden in the same fashion as node ID numbers.

③ Parts

Part ID numbers used for strain energy density injury metrics (Liver, Spleen, Kidneys) can be manually overridden in the same fashion as node and cross section ID numbers.

④ Element and RCFORC Output Current Offsets

If the element and contact numbering for the HBM has been offset by a constant value, then the HBM settings should be modified to reflect the offset. If it is not updated, then CSDM, probabilistic and deterministic rib fracture, and lateral rib deflection metrics will not be active.

⑤ Measurements

Several injury metrics and validation simulation outputs depend on anthropometric measurements made on the default (baseline) model. These can be manually modified by double clicking the numerical value.

⑥ Element Deletion Rib Fractures

If the HBM was run with element deletion turned on in the ribs, then this toggle switch should be turned “On”. This will allow the Deterministic Rib Fracture tool to become active. If this setting is “Off”, then Probabilistic Rib Fracture would be allowed to become active if the appropriate instrumentation files were included in the simulation. This setting corresponds to the value for the chestfail parameter flag in GHBMC LS-Dyna models.

⑦ Restore Model Defaults

If the user has modified instrumentation numbering settings, but wishes to revert back to the default Metriks HBM settings, then the “Restore Model Defaults” button can be used to reset the values.

HBM Settings File

HBM settings are stored in the program’s cache, but can also be saved to the user’s file system to be loaded again at a later time. This settings file can also be edited in a text editor.

① Save Numbering…

The numbering scheme can be saved out to an ASCII text-based file. This file will use a “.hbm” extension name.

② Load Numbering…

Text based “.hbm” instrumentation setting files can be loaded into the HBM settings window and used for Metriks calculations.

Understanding the Instrumentation (.hbm) File Format

The following text file screen capture can be used to highlight key features of the instrumentation file formatting.

Line 1: The first line indicates which model, version and unit system the subsequent numbering scheme will modify. Formatting must match exactly, including the colon after the model name, and brackets around the unit system.

Line 2: Each table in the GUI corresponds to a different section of the settings file. These sections are identified by a leading dash and all capitals for the table name. Note: line 33 for the “-CROSS SECTIONS” table should not contain a dash in the middle of the string.

Line 3: The instrumentation name that matches the first column of the info in the GUI tables is proceeded by a colon and a space, followed by the corresponding ID number. This ID number can be manually modified in the text file, if desired.

Line 81: Settings that do not correspond to tabular data in the GUI falls under the “-OTHER” section. Current settings in Metriks v0.2 that belong under “-OTHER” are the Element Output (ELOUT) and contact reaction force (RCFORC) offset values for all HBM elements and contact forces, respectively. Additionally, the setting for “Element Deletion Rib Fracture” can either be “On” or “Off”.

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Human Body Model Settings