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¶
| 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¶
| 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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