.. _auto_curve_pulse_severity:

*COMPUTE THE PULSE SEVERITY*
============================

Computes pulse severity metrics from an acceleration-time curve, including initial velocity, time-to-zero, efficiency, dynamic crush, rebound velocity, and rebound time. Use this worker to characterize crash pulse quality and energy absorption from a measured or simulated acceleration signal.

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

Classification: **process**.

Tagged: ``acceleration``, ``crash_pulse``, ``dynamic_crush``, ``efficiency``, ``initial_velocity``, ``pulse_severity``, ``rebound``, ``ttz``.

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
     - —
     - 
     - Acceleration-time curve to be analysed (X: time in ms or s, Y: acceleration in consistent units with gravity); leave empty only if the curve is supplied by an upstream worker.
   * - Gravity
     - gravity
     - scalar
     - 0.00981
     - 
     - Gravitational constant used to convert acceleration units (default 0.00981 km/ms² ≈ 9.81 m/s²); adjust if the curve's acceleration is in different physical units.
   * - Return Type
     - return_type
     - string
     - efficiency
     - 
     - Which pulse-severity metric to return: 'initial_velocity', 'ttz' (time-to-zero), 'efficiency', 'rebound_time', 'dynamic_crush', 'rebound_velocity', or 'all' for a full result set; defaults to 'efficiency'.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_pulse_severity_output_1
     - curve_pulse_severity_output_1
     - scalar
     - Scalar result for the selected return_type (e.g. efficiency as a dimensionless ratio, velocity in km/s, time in ms, or crush in mm); when return_type is 'all', a structured record containing all six metrics is returned.

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

- data.curve.transform
- data.signal_processing
- 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=curve_pulse_severity <https://www.d3view.com/api/workflow/example?id=curve_pulse_severity>`_

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_pulse_severity</code>. Schema hash: <code>68a89291aff8</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>