.. _auto_injury_bric:

*COMPUTE THE BRAIN INJURY CRITERION (BRIC) FROM HEAD ANGULAR VELOCITIES*
========================================================================

Computes the Brain Injury Criterion (BrIC) per Takhounts et al. (NHTSA 2013) / UN GTR — BrIC = sqrt((ωx/ωxC)² + (ωy/ωyC)² + (ωz/ωzC)²). Used in US-NCAP oblique and Euro-NCAP frontal protocols to assess rotational head injury risk from peak angular velocities against occupant-specific critical thresholds.

When to use
-----------

Classification: **process**.

Tagged: ``angular_velocity``, ``brain_injury_criterion``, ``bric``, ``head_injury``, ``hybrid_iii``, ``ncap``, ``nhtsa``, ``occupant_safety``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Angular Velocity X
     - angular_velocity_x
     - vector
     - —
     - 
     - Roll-axis (X) head angular velocity time history in rad/s; the worker extracts the peak absolute value. Optional if the roll contribution is zero — leave null to treat ωx as 0.
   * - Angular Velocity Y
     - angular_velocity_y
     - vector
     - —
     - 
     - Pitch-axis (Y) head angular velocity time history in rad/s; the worker extracts the peak absolute value. Optional if the pitch contribution is zero — leave null to treat ωy as 0.
   * - Angular Velocity Z
     - angular_velocity_z
     - vector
     - —
     - 
     - Yaw-axis (Z) head angular velocity time history in rad/s; the worker extracts the peak absolute value. Optional if the yaw contribution is zero — leave null to treat ωz as 0.
   * - Occupant Type
     - occupant_type
     - string
     - adult
     - 
     - Selects the occupant-specific critical angular-velocity denominators (ωxC, ωyC, ωzC); use 'adult' (default) for any Hybrid-III adult dummy (maps to HIII-50M values: 66.25 / 56.45 / 42.87 rad/s), or specify 'hiii-3yo' for the child dummy (58.59 / 43.80 / 39.50 rad/s). Defaults to 'adult' if omitted.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - injury_bric_output_1
     - injury_bric_output_1
     - scalar
     - Dimensionless BrIC scalar value (range 0–1 at regulatory thresholds; values > 1 indicate exceedance); computed as sqrt((ωx_peak/ωxC)² + (ωy_peak/ωyC)² + (ωz_peak/ωzC)²) using the selected occupant's critical velocities.

Disciplines
-----------

- engineering.crash.occupant_safety

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>injury_bric</code>. Schema hash: <code>3ca812b4a39e</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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