1 / 16

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

zada
Download Presentation

HMMWV Rollovers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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>

More Related