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Intrusion Analysis

Description​

Intrusion Analysis compares pre-test and post-test coordinate measurements to show how far defined vehicle-interior points moved during a crash. It summarizes occupant-compartment deformation with a 3D point plot and regional bar chart [1] [2].

When this feature is available​

Intrusion Analysis becomes available when at least one loaded vehicle test meets the requirements.

For a test to pass:

  • The loaded test must be a vehicle test.
  • The test must include at least one instrumentation record so WebSAT can associate the intrusion information with the loaded test.
  • Intrusion information must be available for at least one vehicle.
  • The intrusion information must contain one or more intrusion-point records.

WebSAT enables Intrusion Analysis from the test information. You do not need to select curves, but the loaded test must contain an instrumentation record.

Settings​

This feature has no settings. Point labels, coordinates, and vehicle numbers come from the test information.

How WebSAT processes the data​

  1. Load the available pre-test and post-test intrusion-point coordinates.
  2. Match corresponding X, Y, and Z coordinates for each measurement point.
  3. Calculate resultant motion for every complete point:

d=(xpost−xpre)2+(ypost−ypre)2+(zpost−zpre)2d=\sqrt{(x_{post}-x_{pre})^2+(y_{post}-y_{pre})^2+(z_{post}-z_{pre})^2}

  1. Map recognized measurement names to the intrusion geometry.
  2. Compare each calculated motion with the configured severity thresholds.
  3. Group key measurements such as brake pedal center, driver left/right instrument panel, driver seat bolt, and steering column.
  4. Display the intrusion geometry, point measurements, and severity classifications.

How to interpret the results​

Intrusion thresholds are location-specific visualization bands, not occupant AIS risk functions. Interpret the displacement magnitude and direction with the governing crash procedure and the vehicle coordinate/sign convention [1] [2].

Results​

Pre-test and post-test intrusion point plot
3D comparison of pre-test and post-test point locations.
Intrusion severity bar chart
Regional resultant-intrusion summary.

References​

[1] Saunders, J. and Parent, D. “Repeatability of a Small Overlap and an Oblique Moving Deformable Barrier Test Procedure.” SAE Technical Paper 2013-01-0762, 2013. https://doi.org/10.4271/2013-01-0762.

[2] National Highway Traffic Safety Administration. NHTSA Test Reference Guide, Version 5—Volume 1: Vehicle Tests, November 2014.