.. _auto_curve_chest_viscous:

*CHEST VISCOUS*
===============

Computes the Viscous Criterion (VC) or chest compression speed from a raw chest deflection curve. The input curve is scaled by a user-supplied factor before applying the viscous injury formula, making it suitable for post-processing chest deflection time-histories from frontal or side-impact crash simulations.

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

Classification: **process**.

Tagged: ``VC``, ``chest``, ``chest_deflection``, ``crash``, ``injury_criteria``, ``occupant_safety``, ``scaling``, ``viscous_criterion``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve To Be Scaled
     - curvetobescaled
     - vector
     - —
     - 
     - Raw chest deflection time-history curve (typically in mm vs. ms from a binout or physical-test channel) to be processed; leave unconnected only if testing the worker in isolation.
   * - Scale factor
     - scale_factor
     - scalar
     - 1.0
     - 
     - Multiplicative scale factor applied to the input curve before the VC calculation (dimensionless); default 1.0 leaves the curve unchanged — adjust when units or sensor calibration require rescaling.
   * - Dummy Constant
     - dummyconstant
     - scalar
     - 1.0
     - 
     - Proportionality constant used internally in the viscous-criterion formula (units depend on convention, default 1.0); change only when a non-standard VC formulation with a different normalisation constant is required.
   * - Return Type
     - return_type
     - scalar
     - vc
     - 
     - Selects the output quantity: 'vc' returns the Viscous Criterion curve (compression × speed, m/s), 'speed' returns only the chest compression speed curve; defaults to 'vc'.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - VC
     - curve_vc_o
     - vector
     - Resulting time-history curve — either the Viscous Criterion (VC, in m/s) or the chest compression speed (m/s), depending on the selected return_type.

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_chest_viscous <https://www.d3view.com/api/workflow/example?id=curve_chest_viscous>`_

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_chest_viscous</code>. Schema hash: <code>3f83f46d76be</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>