Wheel Breakage Simulation with msmac3D

Question on 3D Simulation/msmac3D/HVOSM and other 3D Simulation models (HVOSM clones, etc.)
Post Reply
MSI
Site Admin
Posts: 1676
Joined: Thu Jun 18, 2009 12:37 pm

Wheel Breakage Simulation with msmac3D

Post by MSI »

A client asked about whether the program could simulate a wheel breakage/off crash scenario.
Yes we can.
setting up a demonstration/instruction video which will post up soon.
Main steps are:
  1. Set the distance between nodes to 0.5 or so increment between to model the undercarriage impact with the ground
    Nodes display.png
    Nodes display.png (380.88 KiB) Viewed 124 times
  2. Set the Node/Ground Friction Multiplier to a value other than 0.0
    • 0.0 turns off the nodes
    • In the below sample where both front wheels broke off we set the multiplier to 0.50 for first test, and to 1.0 for second test
    • with ground default friction 0.75 that makes the effective MU=0.375 and 0.75
    • We also ran with the wheels intact and partial braking on the front wheels (damage induced)
  3. Go to Grid and insert card(s) 302 seq 1 (time of and new radius inputs) 302, seq 2(time of and new friction) for each wheel
    (Help file will be posted shortly on these inputs)
  4. In below video impact was at approx 0.32 seconds, so set Radius change to 0.40 seconds and rolling radius to 4" for RF and LF tires
More to come in the Instruction video to be posted soon
NEW!! LEASE pricing of msmac3D Software!!
FOR MORE TOPICS see:Forum Index & McHenrySoftware.com
Question? Comment? Please email us (all communications considered confidential)
(c)McHenry Software, Inc ALL Rights Reserved.
MSI
Site Admin
Posts: 1676
Joined: Thu Jun 18, 2009 12:37 pm

Re: Wheel Breakage Simulation with msmac3D

Post by MSI »

The following is a HOWTO video on setting up a 3D Crash reconstruction Simulation which includes wheel separation and the following:
  • NOTE:In the video below i only ran 4 second simulations. The vehicles DID NOT run to positions of rest.
    For a better comparison you should run all vehicles to their position of Rest
    Also note that for the 'wheels intact' simulation i did not put any additional drag on the LF and/or RF wheels
    • which would probably occur in a crash like this, either partial to full braking per wheel (-.50 to -1.0)
    • In any crash look at the evidence:
      • do the wheels appear to have damage induced resistance/braking?
      • if a wheel separation is their any indication of when it occurred?
      • Always go with the evidence!
    • Lastly note that in the prior video (in thread above ) BOTH front wheels were removed and so the vehicle had ONLY undercarriage drag on the front of the vehicle. In this one only 1 wheel was removed so less undercarriage drag. Just FYI!
    This video is mainly to show HOWTO quickly set up a msmac3D simulation and then how to have a wheel separate during the simulation;
NEW!! LEASE pricing of msmac3D Software!!
FOR MORE TOPICS see:Forum Index & McHenrySoftware.com
Question? Comment? Please email us (all communications considered confidential)
(c)McHenry Software, Inc ALL Rights Reserved.
Post Reply