.. _auto_curve_dri:

*COMPUTE THE DRI FOR A GIVEN ACCELERATION CURVE*
================================================

Computes the Dynamic Response Index (DRI) for a given acceleration curve along a specified axis (X, Y, or Z). The DRI is a spinal injury risk metric used in occupant safety and ejection-seat analyses. Use this worker when you need to evaluate spinal load severity from a time-history acceleration signal.

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

Classification: **process**.

Tagged: ``acceleration``, ``curve_transform``, ``dri``, ``dynamic_response_index``, ``ejection_seat``, ``injury_criterion``, ``occupant_safety``, ``spinal_injury``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve
     - vehicle_velocity
     - vector
     - —
     - 
     - Input acceleration time-history curve (time vs. acceleration) on which the DRI calculation is performed; must be supplied as a vector curve object.
   * - Type
     - type
     - string
     - dri_x
     - 
     - Axis direction for the DRI calculation — 'dri_x' (longitudinal), 'dri_y' (lateral), or 'dri_z' (vertical/spinal); defaults to 'dri_x'.
   * - Time Sf
     - time_sf
     - scalar
     - 1
     - ✓
     - Multiplicative scale factor applied to the time axis of the input curve before computation; use 1.0 (default) when the curve is already in seconds.
   * - Acc Sf
     - acc_sf
     - scalar
     - 1
     - ✓
     - Multiplicative scale factor applied to the acceleration axis of the input curve before computation; use 1.0 (default) when the curve is already in the required units (g or m/s²).

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_dri_output_1
     - curve_dri_output_1
     - vector
     - Resulting DRI time-history curve (time vs. DRI value) computed from the scaled input acceleration signal along the selected axis.

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

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

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_dri</code>. Schema hash: <code>7a9a78c9a44c</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>