2 Portland Fish Pier, Suite 211 Portland, ME 04101-4699 Voice: 207.774.9616 Fax: 207.221.1416 Email: [email protected].

Maine Marine Composites LLC:Advanced Engineering Analysis

2 Portland Fish Pier, Suite 211Portland, ME 04101-4699

Voice: 207.774.9616Fax: 207.221.1416

Email: [email protected]

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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Data Set 2

Data Set 3

Data Set 4

Data Set 5

Data Set 6

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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…

Any Questions?