.. _auto_curve_hic_curve:

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

Computes the Head Injury Criterion (HIC) for a given head acceleration time-history curve, supporting both d3VIEW and LS-PrePost calculation back-ends. Use this worker whenever an occupant-safety HIC or HICd scalar (or annotated curve) is needed from a resultant head acceleration signal.

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

Classification: **process**.

Tagged: ``acceleration``, ``crash``, ``d3view``, ``head_injury_criterion``, ``hic``, ``hicd``, ``injury_criteria``, ``lsprepost``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Acceleration Curves
     - acc_curve
     - vector
     - —
     - 
     - Input head resultant acceleration time-history curve (vector of time–acceleration pairs); must be in consistent units before applying scale factors.
   * - Software
     - software
     - string
     - d3view
     - 
     - Calculation back-end to use: 'd3view' (default, internal engine) or 'lsprepost' (delegates to LS-PrePost HIC routine).
   * - Interval
     - interval
     - integer
     - 36
     - 
     - Maximum time-integration window in milliseconds for the HIC integral; choose 15 ms (HIC15) or 36 ms (HIC36, default) per regulatory requirement; use -1 to search all windows.
   * - Time Sf
     - time_sf
     - float
     - 1
     - ✓
     - Multiplicative scale factor applied to the time axis before computation; set to 0.001 if the curve time is in microseconds, 1.0 (default) if already in milliseconds.
   * - Acc Sf
     - acc_sf
     - float
     - 1
     - ✓
     - Multiplicative scale factor applied to the acceleration axis before computation; set to the appropriate factor to convert the signal to units of g (default 1.0 assumes signal is already in g).
   * - Return Type
     - return_type
     - string
     - hic
     - 
     - Selects the output metric: 'hic' (default) returns the standard HIC value; 'hicd' returns the HICd (dummy-specific) variant.
   * - 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
     - vector
     - Output vector containing the computed HIC or HICd scalar result, typically formatted as a single-point or annotated curve carrying the peak injury-criterion value.

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

- 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_curve <https://www.d3view.com/api/workflow/example?id=curve_hic_curve>`_

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_hic_curve</code>. Schema hash: <code>05b1b357395c</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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