.. _auto_curves_contact_duration:

*RETURNS ALL CONTACT FORCES*
============================

Analyses one or more force-vs-time curves and returns the sub-curves that represent active contact periods, defined by a minimum and maximum force threshold. Use this worker to isolate contact events from raw force signals before computing duration-based KPIs.

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

Classification: **process**.

Tagged: ``contact_detection``, ``contact_duration``, ``curve_transform``, ``force``, ``trimming``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves
     - curves
     - vector
     - —
     - 
     - One or more force-vs-time curves (vector) to be analysed for contact events; accepts multiple curves and is optional if no input is yet available.
   * - X Min
     - min_force
     - float
     - 0.0
     - 
     - Minimum force threshold (float, same units as input curve Y-axis, default 0.0) below which contact is considered inactive; raise this value to ignore near-zero noise.
   * - X Max
     - max_force
     - float
     - 1e2.0
     - 
     - Maximum force threshold (float, same units as input curve Y-axis, default 1e2) above which contact is considered ended; used to discard insignificant residual contact after the main event.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_contact_duration_output_1
     - curves_contact_duration_output_1
     - vector
     - Trimmed force-vs-time curve(s) containing only the segments where contact is active, i.e. force values fall between min_force and max_force.

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

- data.curve.pair
- data.curve.transform
- engineering.crash.dynamics

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

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

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_contact_duration</code>. Schema hash: <code>14093c771e2d</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>