109 MPH Crash, Collision Magazine Article, msmac3D Recon

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MSI
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109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

  • NOTE: FIREFOX ISSUE: IF WHEN YOU CLICK PLAY YOU SEE ONLY A CIRCLE (NO VIDEO), FIXED: see link for information if you have similar issue.)
We did a quick Crash Reconstruction with msmac3D of a 109 MPH Crash documented in Collision Magazine, Vol 15, Issue2
The following is from the published paper by McHenry
  • "Investigation of EDR Data from A High Speed Crash with 3D Simulation" Collision Magazine, Vol 16, Issue 1 :
  • Introduction
    • Volume 15, Issue 2 of Collision Magazine contains a case problem article entitled "Did you find any errors when you read through the data?" by W. R. Rusty Haight & David W. Sersen.

      The case problem documents a real-world crash, captured in part on video, where both involved vehicles have similar, nearly identical data sets. Both vehicles had EDRs (Electronic Data Recorders). Both vehicles were General Motors (GM) vehicles, both are "49CFR563 compliant" in terms of the data sets recorded. They are from the same direct to module (D2M) cable family (the "F00K108454" D2M cable family of GM ACMs). The data translation reports for both are almost identical including much of the Data Limitations text. The most significant difference is the actual module variant. One vehicle – a 2013 Buick LaCrosse (Allure) – had what is identified as an "SDM10P-conti" airbag control module (ACM). The other involved vehicle, a 2017 Chevy Tahoe, had an ACM identified as a "SDM30-delphi."

      The first reason for a review of the case problem is the fact that the crash had some EDR (Electronic Data Recorder) anomalies, documented in the article, which demonstrate and caution that EDRs are not infallible, and you always must use caution when reviewing the EDR results. EDR data and information provide additional data for crash reconstruction which needs to be carefully analyzed in concert with other analyses and examinations to come to final conclusions on each individual crash reconstruction.

      The article brought up many important issues which need to be considered and addressed when reconstructing a crash with one, or two, EDRs. EDRs tell part of the reconstruction story…they are a great additional piece of the crash reconstruction puzzle however they can and do have issues/failures and don't tell you everything you need to know about a crash. The referenced article included possibilities for corruption or inadequacy of the EDR data due to proximity of the EDR to the crush zone (does it possibly move during the crash?), collisions wherein the accelerations on vehicles may exceed the limitations of the maximum acceleration which can be recorded by the EDR (many have 50 g-unit limits which represent an approximation of the actual limit) and there are other items which also need to be considered.

      A second reason for interest in the subject crash is that although one vehicle was at an extremely high speed (>100 MPH closing speed), the combined speed is like what might be encountered in 2 lane at-speed highway crashes so the anomalies brought up in the article are applicable to many highway crashes.
Below are initial comparisons of EDR accelerations and DeltaV calculations with preliminary msmac3D results.
look for our upcoming paper in the next issue of Collision Magazine
  • Investigation of EDR Data from a High-Speed Crash with 3D Simulation
    Brian G. McHenry, McHenry Software
With a presentation of comparison results and discussion of evaluation of the EDR data, etc.
stay tuned!
Tahoe EDR msmac3D Comparison.jpg
Tahoe EDR msmac3D Comparison.jpg (190.09 KiB) Viewed 1160 times
Buick EDR msmac3D comparison.jpg
Buick EDR msmac3D comparison.jpg (231.2 KiB) Viewed 1160 times
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MSI
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Re: 109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

Magazine Printed, and issues mailed out
  • or so I'm told, haven't received ours yet but will let you know!
Get your copy here ->
McHenry Collision Magazine Article Title page Vol 16 Issue 1.jpg
McHenry Collision Magazine Article Title page Vol 16 Issue 1.jpg (914.23 KiB) Viewed 736 times
  • CONCLUSIONS
    • A high speed crash test was presented in detail in Volume 15, Issue 2 of Collision Magazine. In the crash, documented EDR results had some anomalies which we have investigated. We found that the maximum G-limit of EDRs combined with adjustment of the start and end time of the Delta-V calculations to try to mimic the EDR software explains the main reasons for the anomaly in the EDR data and reports.

      This article demonstrates that the interpretation of EDR results can be supplemented by the application of 3D simulation, such the msmac3D program. It is possible with computer simulation to supplement partial EDR results, to compare predicted and measured EDR time-histories and to test theories on data issues with EDRs. EDRs are NOT infallible, and they only make up a part of the data required for a complete crash investigation and reconstruction.

      As a result of this preliminary investigation we have also performed an initial investigation of mimicking EDR integration algorithms to further help explain and understand EDR anomalies. We plan to publish on that topic soon.

      A few additional research projects combining simulation and EDR data we plan to undertake include testing the time history waveforms produced by range limitations on accelerometer readings, effects of tire-terrain friction values and corresponding vehicle/ground forces on EDR data, accelerometer (EDR) positions and potential offsets and movements during collision interaction and further exploration of the effects of pitch and roll movements on
      EDRdata.
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MSI
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Re: 109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

NOTE: We will be posting up a HOWTO video soon on all work mentioned in the article
Links to the video will be posted here and also to It will also include a TASK SPECIFIC list so you can quickly jump to areas of interest
We will also send out an email to all our licensees so check your inbox!
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MSI
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Re: 109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

Some other views of the preliminary msmac3D crash reconstruction posted up
Byproduct of some HOWTO videos we are in the process of preparing
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MSI
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Re: 109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

Had a colleague ask whether my assertion that i wrote the article in a week was true So checked my emails and on March 14, 2022 Rusty emailed
  • -----Original Message-----
    From: W. R. Rusty Haight
    Sent: Monday, March 14, 2022 5:22 AM
    To: Brian McHenry
    Subject: Article for Collision
    • Hi Brian:
      ...
      Now is there any way you can put that into, say 10,000 words by Friday? hahahaha! OK, maybe not THAT long but we're going to bump into a publication deadline by Friday the 18th and if you can get something together on the comparison/analysis by then, you'd be my hero.
      ...
And we has several back and forth emails as i requested additional information on the crash, and proceeded to do a quick msmac3D crash reconstruction and EDR analysis (documented in the article) wrote a ~7000 word article which i sent to him on March 21:
  • -----Original Message-----
    From: Brian McHenry
    Sent: Monday, March 21, 2022 10:20 AM
    To: 'W. R. Rusty Haight'
    Subject: RE: Article for Collision
    • Hi Rusty

      Ok here’s the nearly finished version
      You mentioned 10,000 words, well I’m up to 6950!!!
      ...
Obviously did some tinkering/editing/cleaning up but essentially reconstructed and article written within a week!

Interested in our 3D Crash reconstruction software?
see
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Re: 109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

The following is a draft copy of the article published for Collision Magazine being posted for convenience. Please consider subscribing to Collision Magazine
see: Please let us know if you have ANY questions or comments on the article!
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