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Title: An investigation of the influence of surface roughness on reflection coefficients measured by a chirp sonar using a laser profiling of the seafloor.
Creator: Hache, Nicolas., Florida Atlantic University, Beaujean, Pierre-Philippe, Schock, Steven G.
Abstract/Description: This research investigates the validity of an acoustic propagation model by comparing theoretical reflection coefficients, function of frequency, to FAU chirp sonar measurements (chirp sub-bottom profiler). An acoustic model has been implemented to estimate the spectrum of energy reflected from sandy sediments in the presence of surface scattering. The surface roughness being the dominant reverberation part, the volume scattering has been neglected in this model. A laser scanning system...
Show moreThis research investigates the validity of an acoustic propagation model by comparing theoretical reflection coefficients, function of frequency, to FAU chirp sonar measurements (chirp sub-bottom profiler). An acoustic model has been implemented to estimate the spectrum of energy reflected from sandy sediments in the presence of surface scattering. The surface roughness being the dominant reverberation part, the volume scattering has been neglected in this model. A laser scanning system involving an image-processing algorithm has been designed to measure the seafloor bottom roughness using 1D Fourier transforms. In the case of anisotropic roughness, an estimation of the sand ripples dominant direction is provided involving 2D Fourier transforms. Measurements of acoustic data using a chirp sonar and estimation of bottom roughness from video data of the scanner over an artificial bottom are provided to compare the reflection coefficients obtained from the data actually measured with those from the acoustical model.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/13212
Subject Headings: Underwater acoustics--Measurement, Marine sediments--Acoustic properties, Oceanography, Seawater--Acoustic properties
Format: Document (PDF)

Title: Model analysis of a mooring system for an ocean current turbine testing platform.
Creator: Cribbs, Allison Rose., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: In response to Florida's growing energy needs and drive to develop renewable power, Florida Atlantic Universitys Center for Ocean Energy Technology (COET) plans to moor a 20 kW test turbine in the Florida Current. No permanent mooring systems for deepwater hydrokinetic turbines have been constructed and deployed, therefore little if anything is known about the performance of these moorings. To investigate this proposed mooring system, a numeric model is developed and then used to predict the...
Show moreIn response to Florida's growing energy needs and drive to develop renewable power, Florida Atlantic Universitys Center for Ocean Energy Technology (COET) plans to moor a 20 kW test turbine in the Florida Current. No permanent mooring systems for deepwater hydrokinetic turbines have been constructed and deployed, therefore little if anything is known about the performance of these moorings. To investigate this proposed mooring system, a numeric model is developed and then used to predict the static and dynamic behavior of the mooring system and attachments. The model has been created in OrcaFlex and includes two surface buoys and an operating turbine. Anchor chain at the end of the mooring line develops a catenary, providing compliance. Wind, wave, and current models are used to represent the environmental conditions the system is expected to experience and model the dynamic effects on the system. The model is then used to analyze various components of the system. The results identify that a mooring attachment point 1.25 m forward of the center of gravity on the mooring buoy is ideal, and that the OCDP and turbine tether lengths should be no shorter than 25 and 44 m, respectively. Analysis performed for the full system identify that the addition of the floats decreases the tension at the MTB attachment location by 26.5 to 29.5% for minimum current, and 0.10 to 0.31% for maximum current conditions.
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Date Issued: 2010
PURL: http://purl.flvc.org/FAU/2974432
Subject Headings: Marine turbines, Mathematical models, Structural dynamics, Rotors, Design and construction, Offshore structures, Testing
Format: Document (PDF)

Title: The normal incidence reflection coefficient of a sandy seabed as a function of frequency.
Creator: Arizzi, Ernest Allen., Florida Atlantic University, Schock, Steven G.
Abstract/Description: A thesis investigates the measured and theoretical pressure reflection coefficients of the seabed at normal incidence. The theoretical reflection coefficient is calculated using a physics-based model developed by Maurice Biot. The model describes sound propagation in saturated porous media and interrelationships between the acoustic properties of the media and the physical properties of the pore fluid and the porous solid. Stoll modified the Biot model for the case of ocean sediments and...
Show moreA thesis investigates the measured and theoretical pressure reflection coefficients of the seabed at normal incidence. The theoretical reflection coefficient is calculated using a physics-based model developed by Maurice Biot. The model describes sound propagation in saturated porous media and interrelationships between the acoustic properties of the media and the physical properties of the pore fluid and the porous solid. Stoll modified the Biot model for the case of ocean sediments and developed an expression for calculating the reflection coefficient as a function of frequency. This thesis tests the model by comparing the reflection coefficient measured with chirp sonar to the reflection coefficient calculated using the Biot model. An experiment was conducted off Fort Walton Beach, Florida where chirp sonar transmitted FM pulses at normal incidence to a sandy seabed. Sediment properties measured during SAX-99 are used to calculate the theoretical reflection coefficient using the Biot-Stoll model. The agreement of the measured reflection coefficients with the theoretical calculations over the band of 1500 to 16000 Hz varies as much as 70%. The plotted results show a reduction of the reflection coefficient with frequency but the large deviations from the trend prevent any further conclusions.
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Date Issued: 2004
PURL: http://purl.flvc.org/fcla/dt/13191
Subject Headings: Marine sediments--Acoustic properties, Underwater acoustics--Measurement, Sedimentation analysis
Format: Document (PDF)

Title: AN EVALUATION OF MICROBIOLOGICAL METHODS FOR USE IN MARINE WATERS: ENUMERATION OF STAPHYLOCOCCI BY A FLUORESCENT ANTIBODY TECHNIQUE, AND ISOTOPIC DETERMINATION OF BACTERIAL METABOLIC POTENTIAL.
Creator: BUCHANAN, IAN ELLIS., Florida Atlantic University, Hoffmann, H. A.
Abstract/Description: Two methods, a membrane filter-fluorescent antibody technique for detection of Staphylococcus aureus, and isotopic determination of relative heterotrophic activity, were compared with a standard technique based on the recovery of coliform organisms for evaluation as indices of marine pollution. Water samples were collected from coastal areas of Pompano Beach and Boca Raton, Florida. Coliform and staphylococci survival in seawater was studied under laboratory conditions. The effect of exposure...
Show moreTwo methods, a membrane filter-fluorescent antibody technique for detection of Staphylococcus aureus, and isotopic determination of relative heterotrophic activity, were compared with a standard technique based on the recovery of coliform organisms for evaluation as indices of marine pollution. Water samples were collected from coastal areas of Pompano Beach and Boca Raton, Florida. Coliform and staphylococci survival in seawater was studied under laboratory conditions. The effect of exposure to seawater on substrate uptake by coliforms and other sewage microorganisms was studied using isotopic methods. The results of these studies support the feasibility of using S· aureus as a long-range indicator of marine pollution. Under natural conditions, S· aureus appears more resistant to seawater than coliform organisms, although the reverse was found under laboratory conditions. Seawater inhibited uptake of glucose and lactose by Escherichia coli and other sewage organisms. Relative heterotrophic potentials in terms of glucose and lactose uptake velocities were not significantly affected in coastal waters by the influx of bacteria and nutrients in sewage outfall effluent.
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Date Issued: 1973
PURL: http://purl.flvc.org/fcla/dt/13557
Subject Headings: Staphylococcus aureus, Marine pollution, Sewage disposal in the ocean, Sewage--Microbiology
Format: Document (PDF)

Title: Influence of depth-dependent sediment properties on the pressure reflection coefficient at normal incidence using the Biot-Stoll model.
Creator: Joussein, Marianne., Florida Atlantic University, Beaujean, Pierre-Philippe
Abstract/Description: The impact of depth-dependent geophysical parameters on the acoustic pressure reflection coefficient is studied at normal incidence using the Biot-Stoll theory in porous marine sediments. The seabed is modeled as a sediment layer with depth-dependent properties on top of a homogeneous half-space, as originally proposed by Stern. There is no discontinuity in sediment properties between the layer and the half-space. The reflection coefficient is determined by the evaluation of boundary...
Show moreThe impact of depth-dependent geophysical parameters on the acoustic pressure reflection coefficient is studied at normal incidence using the Biot-Stoll theory in porous marine sediments. The seabed is modeled as a sediment layer with depth-dependent properties on top of a homogeneous half-space, as originally proposed by Stern. There is no discontinuity in sediment properties between the layer and the half-space. The reflection coefficient is determined by the evaluation of boundary conditions at the water-sediment layer interface and the sediment layer-half-space interface. Results are obtained for different types of sediment, from medium size sands to silty clay, and different porosity profiles vs. depth.
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Date Issued: 2004
PURL: http://purl.flvc.org/fcla/dt/13168
Subject Headings: Marine sediments--Acoustic properties, Underwater acoustics--Measurement, Sediments (Geology), Environmental geology
Format: Document (PDF)

Title: Isolation, Analysis and Origin of Bioactive Diterpenes in Pseudopterogorgia acerosa.
Creator: Kate, Abhijeet S., Florida Atlantic University, Kerr, Russell G., Charles E. Schmidt College of Science, Department of Chemistry and Biochemistry
Abstract/Description: Nature has served human kind m many ways, one of which is a source of medicines. Natural products from marine sources represent a relatively new area of research and have shown tremendous potential as a source of new chemical entities in drug discovery. Caribbean gorgomans corals of the genus Pseudopterogorgia have been shown to produce a variety of chemically interesting and biologically significant secondary metabolites. ln this dissertation, the Caribbean coral Pseudopterogorgia acerosa...
Show moreNature has served human kind m many ways, one of which is a source of medicines. Natural products from marine sources represent a relatively new area of research and have shown tremendous potential as a source of new chemical entities in drug discovery. Caribbean gorgomans corals of the genus Pseudopterogorgia have been shown to produce a variety of chemically interesting and biologically significant secondary metabolites. ln this dissertation, the Caribbean coral Pseudopterogorgia acerosa has been investigated for the presence of novel diterpenes and these compounds were found to belong to three different classes: pseudopteranoids, bis-pseudopteranoids and lipidyl pseudopteranes. Nine of these were new compounds. The structural elucidation of these compounds was performed using spectroscopic means such as l D and 20 NMR, and mass spectroscopy. There is growing evidence that secondary metabolites isolated from manne invertebrates may actually be produced by a bacterial symbiont. The research studies in our laboratory regarding the source of diterpenes in the selected gorgonian corals suggested a bacterial origin. The hypothesis that coral associated bacteria are the source of diterpenes in the coral P. acerosa, was evaluated using the series of experiments and evidence supported this biosynthetic origin. A study comparing the "gall" tissue and healthy coral tissue in terms of diterpene content and culturable bacterial communities showed that different groups of diterpenes were concentrated in different coral tissue types. It was also observed that the bacterial populations associated with the "gall" and healthy tissues were considerably different. Furthermore, observed specificity in antimicrobial activity of certain groups of compounds against bacteria isolated from the same coral suggested the ecological role of these compounds. This work with "gall" tissue supports the hypothesis that diseased coral tissue represents an excellent source of bioactive natural products for drug discovery. Additionaly, a simple LC-MS method was developed for the analysis of anticancer drug carmustine in plasma.
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Date Issued: 2008
PURL: http://purl.flvc.org/fau/fd/FA00000864
Subject Headings: Marine pharmacology, Coral reef ecology--Caribbean Area, Natural products--Synthesis
Format: Document (PDF)

Title: Isolation and characterization of chlorophyll and carotenoids in Florida Bay: Phytoplankton, microphytobenthos and sediments.
Creator: Loitz, Joseph William, Florida Atlantic University, Louda, J. William
Abstract/Description: An analysis of the waters, microphytobenthos, and carbonate marl sediments of Florida Bay was performed using ion-paired RP-HPLC-PDA for chemotaxonomic characterization of past and present photoautotrophic, communities. Application of regression formulae was determined to be applicable for the waters, microphytobenthos, and surficial sediments (0--5 cm) of Florida Bay using chemotaxonomic principles. Loss of chemotaxonomically important pigments with depth prevented similar application in...
Show moreAn analysis of the waters, microphytobenthos, and carbonate marl sediments of Florida Bay was performed using ion-paired RP-HPLC-PDA for chemotaxonomic characterization of past and present photoautotrophic, communities. Application of regression formulae was determined to be applicable for the waters, microphytobenthos, and surficial sediments (0--5 cm) of Florida Bay using chemotaxonomic principles. Loss of chemotaxonomically important pigments with depth prevented similar application in deeper strata (>5 cm), however, past oxic and anoxic trends could be determined. Sedimentary alteration of pigments are characterized by: rapid conversion of chlorophylls-alpha and bacteriochlorophylls-alpha to their respective pheophytins-alpha, creation of a 'carotenoid diol-cluster', equilibrium isomerization of beta-carotene (15-cis and trans), and rapid conversion of pyropheophorbide-alpha to cyclopheophorbide-alpha. An abundant presence of pyropheophorbide-alpha steryl/hopanoid esters and an unusual relationship between organic carbon and water content providing the sediments with polymeric characteristics were also found.
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Date Issued: 1999
PURL: http://purl.flvc.org/fcla/dt/15734
Subject Headings: Marine sediments--Florida--Florida Bay, Carotenoids--Analysis, Chlorophyll--Analysis
Format: Document (PDF)

Title: Sulfur-35 incorporation in the seagrass Thalassia testudinum under oxic and anoxic conditions.
Creator: Peters, Jasmine Star., Florida Atlantic University, Koch, Marguerite
Abstract/Description: Currently, there is a great deal of interest in the role of sulfur in the seagrass ecosystems and for sulfide, a known phytotoxin, in particular. This research used a 35S tracer technique to examine sulfur metabolism in the seagrass Thalassia testudinum. The uptake of the 35S radiotracer was documented at similar rates under both oxic and anoxic treatments. The highest total radioactivity was in root and rhizome tissue, as compared to the leaves. 35S translocation from roots to leaves was...
Show moreCurrently, there is a great deal of interest in the role of sulfur in the seagrass ecosystems and for sulfide, a known phytotoxin, in particular. This research used a 35S tracer technique to examine sulfur metabolism in the seagrass Thalassia testudinum. The uptake of the 35S radiotracer was documented at similar rates under both oxic and anoxic treatments. The highest total radioactivity was in root and rhizome tissue, as compared to the leaves. 35S translocation from roots to leaves was found to be more efficient in young versus mature leaves. Total sulfur uptake was estimated and found to be significantly different between root and rhizome tissue under oxic conditions. In the anoxic treatment, 1 mM sulfide may have been a threshold, at which the seagrass showed reduced uptake of 35S into the below-ground tissue. While the plants assisted in the production of sulfide in this experiment, sulfide accumulation may inhibit 35S uptake. This is counter to the idea of increased sulfide intrusion under sediment hypoxia. This study represents the first attempt to use 35S to trace sulfur incorporation into seagrass; further research will be required to understand the complex sulfur biochemistry of these important marine plants using this method.
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Date Issued: 2006
PURL: http://purl.flvc.org/fcla/dt/13385
Subject Headings: Seagrasses--Ecology, Sulfates--Physiological effect, Plant morphology, Marine sediments
Format: Document (PDF)

Title: A Design Concept for Launch and Recovery of REMUS 100 AUV from WAM-V 16 USV.
Creator: Palmaccio, Brendan, Dhanak, Manhar, Florida Atlantic University, Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science
Abstract/Description: In this thesis, feasibility of a concept for launch and recovery of the Remus AUV from WAM-V USV is investigated. A modular recovery system which can be added to the WAM-V payload tray was designed, and based on a review of previous literature a CONOPS was developed for the launch and recovery process. The first phase of the CONOPS, which pertains to the position of the REMUS initially on the free surface prior to sling engagement is simulated using ANSYS AQWA. Preprocessing for the...
Show moreIn this thesis, feasibility of a concept for launch and recovery of the Remus AUV from WAM-V USV is investigated. A modular recovery system which can be added to the WAM-V payload tray was designed, and based on a review of previous literature a CONOPS was developed for the launch and recovery process. The first phase of the CONOPS, which pertains to the position of the REMUS initially on the free surface prior to sling engagement is simulated using ANSYS AQWA. Preprocessing for the simulation involved simplification of the model in ANSYS SpaceClaim to achieve a proper mesh as well as theoretical calculations of the input parameters for wave environment and point masses etc. The simulation was evaluated by taking into consideration two wave environment scenarios: beam sea’s (-90 degrees) and head seas (0 degrees). The wave environment was based on a linear frequency range for the waves which considered wavelengths that correspond to half and double the length of the WAM-V 16’. The significance of the simulation is characterized through identifying the ideal direction and wave frequency range for recovery based on the RAOs of the two vehicles.
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Date Issued: 2023
PURL: http://purl.flvc.org/fau/fd/FA00014216
Subject Headings: Autonomous underwater vehicles--Design and construction, Marine engineering, Littoral combat ships
Format: Document (PDF)

Title: Distribution and abundance of micronekton and macrozooplankton in the NW Weddell Sea: relation to a spring ice-edge bloom.
Creator: Donnelly, Joseph, Sutton, Tracey T., Torres, Joseph J., Harbor Branch Oceanographic Institute
Date Issued: 2005
PURL: http://purl.flvc.org/FCLA/DT/2796073
Subject Headings: Nekton --Antarctica --Weddell Sea, Zooplankton --Antarctica --Weddell Sea, Marine phytoplankton --Antarctica --Weddell Sea, Climatic changes --Congresses, Sea ice --Antarctica
Format: Document (PDF)

Title: Climate change and the molecular ecology of arctic marine mammals.
Creator: O'Corry-Crowe, Gregory
Date Issued: 2008
PURL: http://purl.flvc.org/FCLA/DT/1055929
Subject Headings: Marine mammals --Arctic regions., Wildlife management --Arctic regions., Mammal populations --Arctic regions., Molecular ecology., Climatic changes --Arctic regions.
Format: Document (PDF)

Title: Building a diverse and innovative ocean workforcethrough collaboration and partnerships that integrate research and education: HBCUs and marinelaboratories.
Creator: Gilligan, M. R., Verity, P. G., Cook, Clayton B., Cook, Susan B., Booth, M. G., Frischer, Marc E.
Date Issued: 2007
PURL: http://purl.flvc.org/fau/fd/FA00007324
Subject Headings: African American universities and colleges, Marine laboratories, Savannah State University (Ga.), Skidaway Institute of Oceanography, Harbor Branch Oceanographic Institution
Format: Document (PDF)

Title: Report to National Oceanic and Atmospheric Administration, U.S. Department of Commerce: A preliminary investigation of upwelling as a source of nutrients to Looe Key National Marine Sanctuary.
Creator: Lapointe, Brian E., Smith, Ned P.
Date Issued: 1987
PURL: http://purl.flvc.org/FCLA/DT/3352194
Subject Headings: United States. National Oceanic and Atmospheric Administration, Upwelling (Oceanography), Looe Key National Marine Sanctuary (Fla.), Nutrients in ecosystems
Format: Document (PDF)

Title: Trace element concentrations in blood of free-ranging bottlenose dolphins (Tursiops truncatus): influence of age, sex and location.
Creator: Stavros, Hui-Chen W., Bossart, Gregory D., Hulsey, Thomas C., Fair, Patricia A., Harbor Branch Oceanographic Institute
Date Issued: 2007
PURL: http://purl.flvc.org/FCLA/DT/2708406
Subject Headings: Marine mammals --Effects of water pollution on, Bottlenose dolphin --Research --United States, Trace elements --Toxicology, Mercury --Bioaccumulation
Format: Document (PDF)

Title: South Atlantic MPAs and deepwater coral HAPCs: Characterization of fish communities, benthic habitat, and benthic macrobiota. Final Report for 2012-2014 NOAA Cruises. A NOAA CIOERT Report.
Creator: Harter, Stacey, Reed, John K., Farrington, Stephanie, David, Andrew, Harbor Branch Oceanographic Institute
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00007516
Subject Headings: Marine parks and reserves, Deep sea corals, Benthos Habitat, Fish communities, South Atlantic Fishery Management Council (U.S.)
Format: Document (PDF)

Title: Transport over a narrow shelf: Exuma Cays, Bahamas.
Creator: Smith, Ned P.
Date Issued: 2004
PURL: http://purl.flvc.org/FCLA/DT/2795920
Subject Headings: Exuma Islands, Bahamas --Maps, Continental shelf, Continental shelf --Caribbean Area, Marine ecology, Ocean temperature --Caribbean Sea --Charts, diagrams, etc.
Format: Document (PDF)

Title: Captive breeding for the gastropod conch (Strombus spp.).
Creator: Shawl, Amber L., Davis, Megan, Corsaut, Jerry
Date Issued: 2003
PURL: http://purl.flvc.org/FCLA/DT/2171956
Subject Headings: Gastropoda --Reproduction, Queen conch, Fisheries --Caribbean Sea --Congresses, Fisheries --Mexico, Gulf of --Congresses, Gastropoda --Eggs --Identification, Marine ecology --Experiments
Format: Document (PDF)

Title: Analysis of ship hull and plate vibrations caused by wave forces.
Creator: Lakitosh, Fnu, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: In the present dissertation, the hydrodynamic and hydro-elastic characteristics of ship hull and plate vibrations are analyzed using theoretical and numerical methods. The wave forces are determined using a suite of methods which include the Froude-Krylov method for incident wave forces, Wagner's method and ABS rules for the slamming wave force, and numerical methods for nonlinear wave radiation forces. Finite difference methods are developed to determine the wave forced vibrations of ship...
Show moreIn the present dissertation, the hydrodynamic and hydro-elastic characteristics of ship hull and plate vibrations are analyzed using theoretical and numerical methods. The wave forces are determined using a suite of methods which include the Froude-Krylov method for incident wave forces, Wagner's method and ABS rules for the slamming wave force, and numerical methods for nonlinear wave radiation forces. Finite difference methods are developed to determine the wave forced vibrations of ship hull plates which are modeled using a range of plate theories including nonlinear plate theory with and without material damping and orthotropic plate theory for stiffened hull plates. For small amplitude deformation of thin plates, a semi-theoretical superposition method is used to determine the free and forced vibrations. The transient ship hull vibration due to whipping is also analyzed using the finite difference method. Results, in the form of deformations and stress distributions, are obtained for a range of scantling and wave parameters to identify key parameters to consider in ship structural design.
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Date Issued: 2012
PURL: http://purl.flvc.org/FAU/3342196
Subject Headings: Vibration (Marine engineering), Hulls (Naval architecture), Ships, Hydraulic impact, Ocean waves, Mathematical models, Fluid dynamics, Mathematical models
Format: Document (PDF)

Title: Cellular Basis of Sponge-Sponge Associations.
Creator: Conkling, Megan, Pomponi, Shirley A., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Marine sponges interact and coexist with many different organisms. A two-sponge association between Amphimedon erina and Geodia gibberosa commonly occurs in the Florida Keys. Previous studies have only focused on the ecological influence of the association; they did not examine the cellular basis of the association. This association between A. erina and G. gibberosa was used in the development of an in vitro model to further the understanding of the cellular basis of natural sponge-sponge...
Show moreMarine sponges interact and coexist with many different organisms. A two-sponge association between Amphimedon erina and Geodia gibberosa commonly occurs in the Florida Keys. Previous studies have only focused on the ecological influence of the association; they did not examine the cellular basis of the association. This association between A. erina and G. gibberosa was used in the development of an in vitro model to further the understanding of the cellular basis of natural sponge-sponge associations. In this study, sponge cells were cultured individually and in co-cultures and their responses related to apoptosis, cell death, and proliferation were monitored using high content imaging. Co-cultured cells of species that form sponge-sponge associations did not have the same cellular responses compared to co-cultured cells of species that do not form sponge-sponge associations. Protein expression analyses demonstrated that the model that was established does not mimic the cellular response of the association in nature, but this model can be used to test in vitro cellular interactions of sponge species that do not form associations in nature. In addition, the protein expression data that were obtained revealed that sponges use similar apoptotic pathways as humans and suggest that sponge cells may shut down cell cycling in order to repair damaged DNA. This research is a small piece to the puzzle that is sponge cell culture research.
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Date Issued: 2017
PURL: http://purl.flvc.org/fau/fd/FA00004848, http://purl.flvc.org/fau/fd/FA00004848
Subject Headings: Sponges--Habitat--Florida., Marine invertebrates--Florida., Aquatic invertebrates--Cultures and culture media., Apoptosis., Cell culture., Symbiosis.
Format: Document (PDF)

Title: Finite Element Modeling and Fatigue Analysis of Composite Turbine Blades under Random Ocean Current and Turbulence.
Creator: Canino, Marco M., Mahfuz, Hassan, Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: Several modifications have been implemented to numerical simulation codes based on blade element momentum theory (BEMT), for application to the design of ocean current turbine (OCT) blades. The modifications were applied in terms of section modulus and include adjustments due to core inclusion, buoyancy, and added mass. Hydrodynamic loads and mode shapes were calculated using the modified BEMT based analysis tools. A 3D model of the blade was developed using SolidWorks. The model was...
Show moreSeveral modifications have been implemented to numerical simulation codes based on blade element momentum theory (BEMT), for application to the design of ocean current turbine (OCT) blades. The modifications were applied in terms of section modulus and include adjustments due to core inclusion, buoyancy, and added mass. Hydrodynamic loads and mode shapes were calculated using the modified BEMT based analysis tools. A 3D model of the blade was developed using SolidWorks. The model was integrated with ANSYS and several loading scenarios, calculated from the modified simulation tools, were applied. A complete stress and failure analysis was then performed. Additionally, the rainflow counting method was used on ocean current velocity data to determine the loading histogram for fatigue analysis. A constant life diagram and cumulative fatigue damage model were used to predict the OCT blade life. Due to a critical area of fatigue failure being found in the blade adhesive joint, a statistical analysis was performed on experimental adhesive joint data.
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Date Issued: 2016
PURL: http://purl.flvc.org/fau/fd/FA00004727, http://purl.flvc.org/fau/fd/FA00004727
Subject Headings: Composite materials -- Fatigue, Finite element method, Fluid dynamics, Marine turbines -- Mathematical models, Ocean wave power, Structural dynamics
Format: Document (PDF)

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