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Maine Marine Composites LLC:Advanced Engineering Analysis
2 Portland Fish Pier, Suite 211Portland, ME 04101-4699
Voice: 207.774.9616Fax: 207.221.1416
Email: info@mainemarinecomposites.com
Who We Are…MMC was founded in 2006
Four employees, two+ associatesMMC Specializes in:
Engineering analyses of barges, boats, ships Design, stability, performance, seakeeping
Engineering analyses of offshore energy systems Hydrokinetic energy systems (waves, tidal –
moving water) Platforms for offshore wind systems Support vessels for offshore wind systems
What We Do:Marine Seakeeping Analyses:Analyze barge motion for lashing design
Find accelerations, check strength of cargo restraints
What We Do:Performance Analysis for High Speed BoatsDevelop/Market POWERSEA Time-Domain Simulator
Performance, stability, shock/vibration
POWERSEA Navy ProjectMMC/SAIC/Combatant Craft validation of POWERSEA results
What We Do:Instrumentation for Marine EnvironmentMeasure hydrodynamic loads on moored and fixed
structuresMeasure shock and vibration on high speed craftCollect oceanographic data for
offshore energy site evaluation
Figure Tekscan A201 Standard FlexiForce® Sensors
Demonstration Project:Single-Point Wave Energy Converter
Buoy moves vertically (heave motion)
Air is compressed in center pipeDrives turbine to create electricity
Efficiency depends on relative heave motion of WEC If WEC moves up when water goes
down, get maximum compressionDesign Issues
Mooring systemSea State Response (RAO)
John Brooke, Vice-President, Engineering Committee on Oceanic Resources, Wave Energy Conversion, 2003.
“Typical” Wave Energy Converter(Oscillating Water Column) University of Wisconsin Madison Nicole Johnson & Eric Olson. CEE 514: Final Project http://owcwaveenergy.weebly.com/
Creating a Surface Model with Rhino3D
Building AQWA ModelImport Rhino3D model (IGES) into ANSYS Design ModelerCreate surfaces, waterline cutplaneCalculate hydrodynamic diffraction using AQWA (potential flow
theory)
“Meshing” for AQWA Analysis
AQWA: Mooring System Analysis
OWC/WEC Analysis ResultsResonating OWC:
Movie: “ AnsysWBU 2011-08-09 17-54-39-35.avi”
Demonstration Project:Seakeeping Study
Creating a CAD ModelUsing MultiSurf
Building a Model BoatCreate full-size patterns (“lofting”) of frames and keel from
CAD modelCut parts from marine plywood, glue togetherWrap with Kevlar expanded core materialCover with 24-oz fiberglass/epoxy, sand, paintInstall radios, motors, machinery, ballast
Free-RunningRadio-Controlled Model
• R/C Model of R/V Hugh R. Sharp, Univ. of Delaware
• Twin Schottel Rudderprop propulsors• Forced roll mechanism to test
seakeeping• Inertial Measurement Unit (IMU) to
capture motion
Results of Model TestsTested bilge-keels, fins of
various sizesConclusion: Require active
roll mitigation system
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r)
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Data Set 1
Data Set 2
Data Set 3
Data Set 4
Data Set 5
Data Set 6
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Data Set 1
Data Set 2
Model Test ResultsTests in Casco Bay:
Movie: “ModelRollOcean1.avi”Movie: “ ModelRollOcean2.avi”
Using ANSYS AQWA for SeakeepingCreate MultiSurf/Rhino3D model of R/V Hugh R. Sharp
AQWA: Analysis of Research Vessel
AQWA: Mesh of Sportfishing Boat
AQWA Prediction of Wave Forces (Froude-Krylov Forces)
AQWA: Roll Rotation vs. Heading and Wave Frequency
AQWA: Wave FieldOblique Sea, Non-Linear Waves
AQWA Seakeeping ResultsDestroyer in Following Sea
Movie: “ BulbousBowFollowingSea.avi”
Sportfishing Boat in Quartering seaMovie: “ RegularQuarterBeamHead.avi”
ConclusionsANSYS software tools can be used to solve real-world
problems in the marine industry
MMC offers advanced design and analysis servicesExperienced with sophisticated analysis toolsExpertise in hydrodynamics, marine design and analysis
Thanks for Listening…
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