HMMWV Rollovers

1
HMMWV Rollovers
Picture taken from Google.com
By, Chantelle Korson
2
PROBLEM STATEMENT

• HMMWV not an armored vehicle
• Armor Kits (up-armoring or hardening)
• Added sand bags, metal sheets, and plywood
• Increased Risks
• Extra shrapnel
• Added weight
• Overload the suspensions
• Rolling
• Extra weight (up-armoring kits)
• High Centers of Gravity

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Types of Add-on Armor
Pictures taken from http//www.defense-update.com

4
General Idea
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Assumptions

• Russian Testing
• Steal Pot
• Limit outside factors (ground density)
• Averaged/Estimated Data
• Vehicle specs
• Center of Gravity
• Force of Explosion

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Original Model
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Modified Model
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Test Results
Force6KN-9KN
Radians of Rotation .00787-.01189
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Height of Center of Gravity vs. Rolling
Displacement
Height of Center of Gravity .6m .8m 1m
Max Radians of Rotation Before Rolling 0.0106 0.00933 0.00823
Max Degrees of Rotation Before Rolling 0.609 0.535 0.471
Max Meters of Rotation Before Rolling 1.317 1.154 1.02
Max Feet of Rotation Before Rolling 4.32 3.79 3.35
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Max Rotation Calculation
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Data From Simulation
Height of Center of Gravity 0.6 0.8 1
Max Radians Before Rolling 0.01064 0.00933 0.00823
Force      
6KN 0.00787 0.00787 0.00787
7KN 0.00928 0.00915 0.00928
8KN 0.01061 0.01048 0.01061
9KN 0.01189 0.01181 0.01189
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Height of Center of Gravity vs. Radial
Displacement
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Validation

• Engineer from TARDEC
• Weve added enough armor to survive the
  explosion, but now the problem is surviving the
  rollover.
• Numerous Website and Publications
• Roll over problems with added armor
• Both while in motion and caused by explosions

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Plan/Problems/Modifications

• Original Experiment Set Up
• Change in mass not significant change in
  rollover factors
• As mass increased vehicle became safer
• Simple Simulation
• Basic bugs
• MSe connected to zero junction
• Pulse effort with a continuous displacement

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Safercar.gov

• SSFT/2H
• TTrack Width
• H Height of Center of Gravity
• Average .8m Height of Center of Gravity
• Hummer SSF 2.064
• 5 Stars

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References

• Afghanistan incident Report 2002
• lthttp//www.vcdsforces.gc.ca/boi_jowz/00Native/Anx
  -HDRC_Preliminary_iltis_incident_report.pdfgt
• Mark D. Donahue. Implementation of an Active
  Suspension, Preview Controller for Improved Ride
  Comfort University of California at Berkeley,
  1998
• lthttp//vehicle.berkeley.edu/publications/ASC/mddo
  n_msthesis.pdfgt
• The Application of Bond-Graphs to Real-Time
  Simulation Modeling of Vehicle Dynamics 27
  March. 2006
• ltUlrich.kramer_at_fh-bieldfeld.degt and
  lthttp//autolabfh-bielefeld.degt
• NATO STANAG 4569 2a to 3a. 30 March. 2006
• ltwww.ssss.comgt
• Eagle Armored Vehicle, Up Armored HUMVEE,
  Up-Armored Humvee M1114, and Guardian Door
  Protection For Humvee. 30 March. 2006
• lthttp//www.defense-update.comgt
• AM General Light Service Support Vehicle 26
  March. 2006 lthttp//www.amgeneral.com/vehicles_lss
  v_prodectinfo.phpgt
• Defense Link 30 March. 2006
• lthttp//www.defenselink.mil/transcripts/2004/tr200
  41215-1801.htmlgt
• High Mobility Multipurpose Wheeled Vehicle 28
  March. 2006
• lthttp//en.wikipedia.org/wiki/Humveegt
• Japan International Cooperation System February
  2004
• lthttp//Jics.or.jp/jigyou/kenkyu/pdf/3GeneralRequi
  rement.pdf.gt
• ADVISOR Advanced Vehicle Simulator 30 March.
  2006
• lthttp//www.iitedu/ipro326/research.htmlgt