.. _auto_curve_disp_to_ai:

*DISP TO ENERGY DENSITY VS DISP*
================================

Converts a displacement-vs-time (or displacement-vs-displacement) curve into an Absorbed Energy Density vs. Displacement curve by numerically integrating the input signal. Optional filtering (SAE/CFC/BW/COS/FIR) and axis scale factors are applied before integration. Use this worker when you need an energy-absorption metric from a raw displacement channel.

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

Classification: **process**.

Tagged: ``absorbed_energy``, ``cfc_filter``, ``crash``, ``curve``, ``disp``, ``energy_density``, ``integration``, ``sae_filter``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Base Curve
     - base_curve
     - vector
     - —
     - 
     - Input displacement curve (X = displacement or time, Y = force or displacement); accepted as a vector pair — leave empty only if the curve is injected upstream in the workflow.
   * - Y-scale-factor
     - x_sf
     - scalar
     - 1
     - 
     - Scale factor applied to the X-axis (displacement/time channel) before processing; dimensionless, default 1.0 (no scaling).
   * - Y-scale-factor
     - y_sf
     - scalar
     - 1
     - 
     - Scale factor applied to the Y-axis (force or displacement channel) before processing; dimensionless, default 1.0 (no scaling).
   * - FilterType
     - filter_type
     - scalar
     - lsprepost_sae
     - 
     - Low-pass filter algorithm applied to the curve before integration; options are lsprepost_sae (default), lsprepost_bw, lsprepost_cos, lsprepost_fir, cfc, or sae — leave at default for standard SAE crash-channel filtering.
   * - Frequency
     - frequency
     - integer
     - 300
     - 
     - Filter cut-off frequency in Hz applied together with filter_type; choose from 30/60/120/180/300 (default)/600/1000 Hz to match the channel class per SAE J211 or CFC convention.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_disp_to_ai_output_1
     - curve_disp_to_ai_output_1
     - vector
     - Resulting Absorbed Energy Density vs. Displacement curve (X = displacement in input units × x_sf, Y = energy density in force·length units × y_sf) after filtering and numerical integration of the base curve.

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

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_disp_to_ai</code>. Schema hash: <code>b8dca27eab79</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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