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HMMWV Rollovers

HMMWV Rollovers. Picture taken from: Google.com. By, Chantelle Korson. 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

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HMMWV Rollovers

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  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

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

  4. General Idea

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

  6. Original Model

  7. Modified Model

  8. Test Results Force=6KN-9KN Radians of Rotation = .00787-.01189

  9. Height of Center of Gravity vs. Rolling Displacement

  10. Max Rotation Calculation

  11. Data From Simulation

  12. Height of Center of Gravity vs. Radial Displacement

  13. Validation • Engineer from TARDEC • “We’ve 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

  14. 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

  15. Safercar.gov • SSF=T/2H • T=Track Width • H = Height of Center of Gravity • Average .8m Height of Center of Gravity • Hummer SSF = 2.064 • = 5 Stars

  16. References • Afghanistan incident Report 2002 • <http://www.vcdsforces.gc.ca/boi_jowz/00Native/Anx-HDRC_Preliminary_iltis_incident_report.pdf> • Mark D. Donahue. Implementation of an Active Suspension, Preview Controller for Improved Ride Comfort University of California at Berkeley, 1998 • <http://vehicle.berkeley.edu/publications/ASC/mddon_msthesis.pdf> • The Application of Bond-Graphs to Real-Time Simulation Modeling of Vehicle Dynamics 27 March. 2006 • <Ulrich.kramer@fh-bieldfeld.de> and <http://autolabfh-bielefeld.de> • NATO STANAG 4569 2a to 3a. 30 March. 2006 • <www.ssss.com> • Eagle Armored Vehicle, Up Armored HUMVEE, Up-Armored Humvee M1114, and Guardian Door Protection For Humvee. 30 March. 2006 • <http://www.defense-update.com> • AM General: Light Service Support Vehicle 26 March. 2006<http://www.amgeneral.com/vehicles_lssv_prodectinfo.php> • Defense Link 30 March. 2006 • <http://www.defenselink.mil/transcripts/2004/tr20041215-1801.html> • High Mobility Multipurpose Wheeled Vehicle 28 March. 2006 • <http://en.wikipedia.org/wiki/Humvee> • Japan International Cooperation System February 2004 • <http://Jics.or.jp/jigyou/kenkyu/pdf/3GeneralRequirement.pdf.> • ADVISOR: Advanced Vehicle Simulator 30 March. 2006 • <http://www.iitedu/ipro326/research.html> • Bomb Shock Wave Estimation. 26 March. 2006 <http://www.makeitlouder.com/document_bombshockwaveestimation.html> • Safercar 29 March.2006 • <http://www.safercar.gov>

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