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Modeling Collision USS Greenville - MV Ehime Maru - Naval

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Modeling Collision USS Greenville - MV Ehime Maru - Naval Powered By Docstoc
					NPS Project Capabilities

  Modeling the 3D Collision Track
   between USS GREENEVILLE
       and MV Ehime Maru
         Progress Report, 14 June 2001

                   Don Brutzman
     MOVES and Undersea Warfare Academic Groups
             Naval Postgraduate School

               brutzman@nps.navy.mil
Background:
Naval Postgraduate School
“Navy’s University” Monterey California
• USN, USMC, USA, USAF, allied officers, civil service
• Two-year masters’ degrees with theses

Undersea Warfare Academic Group
• Multiple specialized degree programs
• Curriculum includes UW3303 modeling & simulation course

MOVES Institute
• Modeling, Virtual Environments & Simulation
• Mix of computer science & ops research simulation
Project Description
Goal
• Model all aspects of ship collision with full precision
Motivation
• Produce high-resolution 3D virtual environment
• Utilize unclassified information assets
• Provide challenging projects for NPS students
• Serve as learning tool for studying lessons learned
• Prototype for visualizing at-sea tactical awareness
Modelers and sources
Modelers
• Undersea warfare students: track reconstruction
• MOVES students: 3D models
Data Sources
• Court of Inquiry report has massive details of interest
  http://www.cpf.navy.mil/cpfnews/coidownloadmain.html
• National Transportation Safety Board (NTSB) advisory
• Various press reports
Court of Inquiry download
page
Reconstruction
chartlet from
Court of Inquiry
New York Times figure
8 March 2001
National Transportation
Safety Board reconstruction
• Initial report 2 March 2001
• http://www.ntsb.gov/Pressrel/2001/010302.htm
National Transportation
Safety Board 3D plot

• Initial report
  2 March 2001
• Difficult to
  visualize
3D Scene and Ship Models
Initial modeling complete
• Spreadsheet-based dead reckoning of reconstruction
• Aggregate scene with time-based ship tracks
   – WaypointInterpolatorPrototype
• 688 class submarine (USS GREENEVILLE)
• MV Ehime Maru
• Initial control model of sea state at collision point
• Autogeneration of model library
Collision: USS Greeneville,
MV Ehime Maru
Entry view
USS Greeneville, port
quarter
USS Greeneville, aft stbd
quarter
Ehime Maru, stbd quarter
Ehime Maru, astern
Controllable sea state




           Controllable sea state
Sea state from above
X=0
Y=0
      Key Coordinates for the                               X = 147,569
                                                            Y=0
      VRML Map of Oahu
Z = -110,572                                                Z = -110,572




                      Oahu




                                                      Molokai   X = 147,569
X=0                          Collision                          Y=0
Y=0                           Area
                                                                Z=0
Z=0

                                         X = 61,000
               Default viewpoint         Y = 20,000
                                         Z = 23,000
Oahu 3D model in
progress
Technology used: X3D
Extensible 3D (X3D) Graphics Specification
• 3rd generation Virtual Reality Modeling Language
• ISO international standard, non-proprietary
• 3D graphics interchange for World Wide Web
• Suitable for scaling up to very large networked worlds
• Open source, commercial implementations available
• http://www.web3D.org/x3d.html
• NPS is leading X3D development
Future work:
already in progress
Analysis
• Spline plots for tracks
• Improved sea-state rendering and control
• Evaluate 6 degree-of-freedom (DOF) hydrodynamics

3D modeling
• Periscope viewpoint and animated tour
• Improved usability: control over scenario clock, etc.
• Fog, cloudiness, time of day, other visual effects
• Integrated rendering of sonar and radar
• Multimedia integration: audio, video, hypertext, still imagery
Contact
              Don Brutzman

           brutzman@nps.navy.mil
     http://web.nps.navy.mil/~brutzman

   Code UW/Br, Naval Postgraduate School
    Monterey California 93943-5000 USA
            831.656.2149 voice
            831.656.3679   fax

				
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