.. _auto_curve_hic:

*COMPUTE THE HEAD INJURY CRITERIA (HIC) FOR A GIVEN ACCELERATION CURVE*
=======================================================================

Computes the Head Injury Criterion (HIC) from a resultant head acceleration–time curve. Supports HIC15 and HIC36 intervals and accepts unit-scaling factors for both time and acceleration axes. Use this worker whenever an occupant-safety post-processing pipeline requires a standardised HIC scalar value.

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

Classification: **process**.

Tagged: ``acceleration``, ``crash``, ``d3view``, ``head_injury``, ``hic``, ``hic15``, ``hic36``, ``injury_criteria``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve To Be Looked Up
     - curvetobelookedup
     - vector
     - —
     - 
     - Resultant head acceleration vs. time curve (vector) on which HIC will be computed; must be in consistent units before scaling is applied.
   * - Software
     - software
     - string
     - d3view
     - 
     - Backend solver used for the HIC calculation — choose 'd3view' (default, native implementation) or 'lsprepost' (delegates to LS-PrePost's HIC routine).
   * - Interval
     - interval
     - integer
     - 36
     - 
     - Maximum allowable time interval (ms) over which HIC is maximised; standard values are 15 (HIC15, FMVSS 208) or 36 (HIC36, ECE R94); use -1 to search the full curve; default is 36.
   * - Time Sf
     - time_sf
     - float
     - 1
     - ✓
     - Multiplicative scale factor applied to the time axis before computation; set to 0.001 when the curve time is in milliseconds and the algorithm expects seconds, or 1.0 if already in seconds (default 1.0).
   * - Acc Sf
     - acc_sf
     - float
     - 1
     - ✓
     - Multiplicative scale factor applied to the acceleration axis before computation; set to convert native units to g (e.g. 1/9810 if in mm/s²); default is 1.0 (curve already in g).
   * - Return Type
     - return_type
     - string
     - hic
     - 
     - Selects the HIC variant returned: 'hic' for the standard Head Injury Criterion value, or 'hicd' for the HIC-with-duration (HICD) formulation; default is 'hic'.
   * - Points Type
     - point_type
     - string
     - all
     - 
     - 

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_hic_output_1
     - curve_hic_output_1
     - scalar
     - Scalar HIC (or HICD) value computed over the specified time interval; dimensionless, in standard HIC units — higher values indicate greater injury risk (threshold typically 700 for HIC15 or 1000 for HIC36).

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

- cae.postprocessing.response
- data.curve.transform
- engineering.crash.occupant_safety

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curve_hic <https://www.d3view.com/api/workflow/example?id=curve_hic>`_

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_hic</code>. Schema hash: <code>3a6df2691509</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>