us army corps of engineers engineer research & development center navigation channel design...
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US Army Corpsof Engineers Engineer Research & Development Center
Navigation Channel DesignUsing Real-Time Marine Simulation
Don Wilson
Chief – Navigation Branch
ERDC
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US Army Corpsof Engineers Engineer Research & Development Center
Bringing the real world into a laboratory environment.
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US Army Corpsof Engineers Engineer Research & Development Center
Why do we model navigation projects?
• Allows end-users a controlled environment to operate ships in their waterway of the future.– Safety check– Gets pilots “onboard” project.
• Allows comparison between multiple proposals.
• Allows optimization of channel dimensions.
• Provides rationalization of project design to competing interests.
• Because it’s the law.
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US Army Corpsof Engineers Engineer Research & Development Center
ER 1110-2-1403
• Engineering and Design: Studies by Corps Hydraulic and Hydrologic Facilities and Others.– Paragraph 6b. Hydraulic design studies
associated with the planning, design, construction, operation, and maintenance of of navigation channels will include a ship-simulation investigation unless omission of such an investigation is approved by HQUSACE. This policy does not pertain to the design of commercial small-craft harbor channels.
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US Army Corpsof Engineers Engineer Research & Development Center
ERDC Ship/Tow Simulators
• Calculate & reproduce vessel response to forces.• Real-Time
– Movements require the same amount of time as real life.
• 240 degree field of view• Wide variety of configurations.• Two simulators
– Function independently or couple for two-way traffic• Can be reconfigured as tows for shallow draft studies.
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US Army Corpsof Engineers Engineer Research & Development Center
Man In The Loop
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US Army Corpsof Engineers Engineer Research & Development Center
Console Displays
• Displays commands– Wheel– Throttle
• Input commands– RPM– Viewing angle and position– Thrusters
• Display ship info– Speed– Rate of Turn
• Wind
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US Army Corpsof Engineers Engineer Research & Development Center
ECDIS & Radar
– Electronic Chart Display and Information System (ECDIS)
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US Army Corpsof Engineers Engineer Research & Development Center
Operator’s Station
• Setup and monitor runs.
• Two stations, one for each simulator.
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US Army Corpsof Engineers Engineer Research & Development Center
Two simulators for 2-way traffic
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US Army Corpsof Engineers Engineer Research & Development Center
Forces Modeled
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US Army Corpsof Engineers Engineer Research & Development Center
Six Degrees of Freedom
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US Army Corpsof Engineers Engineer Research & Development Center
Steps for Conducting a Simulator-Based Navigation Study
• Reconnaissance Trip
• Database Preparation
• Validation
• Pretesting & Design
• Testing
• Result Analysis and Reporting
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US Army Corpsof Engineers Engineer Research & Development Center
Reconnaissance Trip• Meet with pilots
• Evaluate Port Operations
• Ride as many transits as possible– Clear with pilots, ship master,
agent, customs– Severe Navigation Conditions
• Large ships
• Currents
• Two-way traffic
• Video & Photos
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US Army Corpsof Engineers Engineer Research & Development Center
Database Preparation
• Visual Databases
• Environmental Databases
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US Army Corpsof Engineers Engineer Research & Development Center
Visual Databases
• Represent the simulated world as realistically as possible.
• Visual Scene– Projected in front of pilot
• Radar– Radar console on bridge
• Electronic Chart Display and Information System (ECDIS)– ECDIS console on bridge
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US Army Corpsof Engineers Engineer Research & Development Center
Visual Scene• Include basic requirements for navigation.
– Ownship bow image.• Ownship is the vessel being simulated.
– Shoreline– United States Coast Guard maintained Aids-to-Navigation
(ATONS)– Informal ATONS
• Steeples, radio towers, etc.– Bridges.– Important docks and other structures.– Other vessels for two-way traffic.– Local structures to provide feel of realism.
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US Army Corpsof Engineers Engineer Research & Development Center
Visual Scene Development
• All objects are constructed with three- and four- side polygons.
• Wire frames are then given a texture or “skin.”
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US Army Corpsof Engineers Engineer Research & Development Center
Visual Scene Development
• Using digital images as a texture provides additional realism.
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US Army Corpsof Engineers Engineer Research & Development Center
ECDIS
• Existing condition ECDIS is provided from simulator’s library of navigation charts.
• Development of future condition ECDIS may be necessary.
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US Army Corpsof Engineers Engineer Research & Development Center
Environmental Databases• Channel Definition.
– Obtained from COE District Office– Bathymetric Surveys
• Currents– Usually a separate TABS-MD study
• Can model existing and proposed conditions– Acoustic Doppler Current Profiler (ADCP)
• Existing conditions only– Physical model
• Can model existing and proposed conditions
• Waves– Usually hindcasting study determines appropriate height/period/direction to be
used during simulations
• Wind– Wind Roses and Pilot Experience
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US Army Corpsof Engineers Engineer Research & Development Center
TABS-MD ModelBrewerton / Tolchester Navigation
Study
Baltimore TolchesterPeninsula
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US Army Corpsof Engineers Engineer Research & Development Center
TABS-MD Model Results
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US Army Corpsof Engineers Engineer Research & Development Center
Simulation Validation
• Use Experienced Pilots
• Repeat Existing Condition Simulation Runs
• Isolate Forces When Possible– Slack Tide– No Wind
• Examine & Modify Databases as Required
• DGPS Survey– Vessel Track Plot– Record rudder & engine commands
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US Army Corpsof Engineers Engineer Research & Development Center
Design Mode Operation
• Assemble Design Team– Corps District Office - Engineers & Planners– Local Mariners– Local Port– U.S. Coast Guard– WES
• Develop Several Possible Plans
• Test Plans
• Analyze, Modify, and Retest
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US Army Corpsof Engineers Engineer Research & Development Center
Testing Procedure
• Test Various Plans– Existing– Proposed (Several to Optimize)
• Test "Maximum Credible Worst Case Scenario"
• Conduct in Random Order
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US Army Corpsof Engineers Engineer Research & Development Center
Savannah Harbor
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US Army Corpsof Engineers Engineer Research & Development Center
Data Recorded
• Position• Heading• Rudder Angle• Engine Speed• Ship Speed• Yaw Angle• Rate of Turn• Tug/Thruster Usage• Port and Starboard Clearances• Vertical Motion due to Waves (every second)
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US Army Corpsof Engineers Engineer Research & Development Center
Result Analysis
• Compare Simulation Runs– Existing– Proposed
• Vessel Track Plots
• Navigation Parameter Plots– Rudder– Engine Speed
• Pilot Evaluations
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US Army Corpsof Engineers Engineer Research & Development Center
Track Plot, Houston Ship Channel2-way run, Spillman’s Island Reach
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US Army Corpsof Engineers Engineer Research & Development Center
Track Plot, Houston Ship ChannelOvertaking Zone near Battleship Texas
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US Army Corpsof Engineers Engineer Research & Development Center
Track Plot, Houston Ship Channel2-way run, Lynchburg turn
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Parameter PlotHouston Ship Channel
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US Army Corpsof Engineers Engineer Research & Development Center
Arthur Kill ChannelsNY Harbor
• Deepening from 38 to 50 ft with some channel re-alignment to accommodate S-class containerships.
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US Army Corpsof Engineers Engineer Research & Development Center
Arthur Kill Current Modeling
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US Army Corpsof Engineers Engineer Research & Development Center
Arthur Kill Channel Dredging Contract Analysis
• Evaluate proposed areas to be buoyed off during construction of 40 ft project.
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US Army Corpsof Engineers Engineer Research & Development Center
Four Dredging Locations Evaluated
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US Army Corpsof Engineers Engineer Research & Development Center
Bridge Evaluation• Optimize span widths.
• Determine proper span location.
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US Army Corpsof Engineers Engineer Research & Development Center
Conclusions
• WES Operates Corps' marine simulator.– Simulate ship and/or tow traffic.– Operates in real time.– Evaluates proposed changes to federal channels.
• Existing conditions (base)
• Proposed conditions (one or more)