.. _auto_chest_deflection_index_calculator:

*COMPUTES THE CDI*
==================

Computes the Chest Deflection Index (CDI) for occupant safety assessment by combining pressure-map data, belt-to-chest force, chest potentiometer coordinates, and chest displacement time history. Use this worker when evaluating thoracic injury risk from shoulder-belt loading in crash simulations.

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

Tagged: ``belt_force``, ``cdi``, ``chest_deflection_index``, ``injury_criteria``, ``occupant_safety``, ``potentiometer``, ``pressure_map``, ``rib``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Pressure Information
     - dataset_1
     - dataset
     - —
     - ✓
     - Pressure dataset in long format with columns [time, x, y, z, pressure] for each MAT segment; column order must match the `input_data_columns` parameter.
   * - Number of Pressure segments per row
     - num_segments
     - scalar
     - 40
     - ✓
     - Number of pressure segments (MAT elements) per time row; defaults to 40 — change only if the pressure mesh was defined with a different segment count.
   * - Best to Chest Force
     - belt_2_chest
     - vector
     - —
     - ✓
     - Time-history vector of the total shoulder-belt-to-chest contact force (N vs. time) used to locate the belt centre-line.
   * - Chest Potentiometer Coordinates
     - chest_potentiometer
     - dataset
     - —
     - ✓
     - Dataset of chest potentiometer (Sternbum pot/ball) global coordinates as columns [time, X, Y, Z] (mm) used to track sternum position.
   * - Chest Displacement Time History
     - chest_displacement
     - vector
     - —
     - ✓
     - Chest displacement time history vector (mm vs. time) representing the measured or simulated sternum deflection curve.
   * - Columns for the input dataset
     - input_data_columns
     - textarea
     - time,x,y,z,pressure
     - ✓
     - Comma-separated column names for `dataset_1`; defaults to `time,x,y,z,pressure` — override only if the pressure dataset uses different column labels or ordering.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - CDI
     - cdi
     - scalar
     - Scalar Chest Deflection Index value (dimensionless integer) representing the computed thoracic injury metric; higher values indicate greater injury risk.

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

- cae.postprocessing.response
- data.dataset.transform
- engineering.crash.occupant_safety

.. raw:: html

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   Auto-generated from <code>platform</code> schema. Worker id: <code>chest_deflection_index_calculator</code>. Schema hash: <code>12fd9fd0e813</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>