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Title: Spectral evaluation of motion compensated adv systems for ocean turbulence measurements.
Creator: Egeland, Matthew Nicklas, von Ellenrieder, Karl, VanZwieten, James H., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A motion compensated ADV system was evaluated to determine its ability to make measurements necessary for characterizing the variability of the ambient current in the Gulf Stream. The impact of IMU error relative to predicted turbulence spectra was quantified, as well as and the ability of the motion compensation approach to remove sensor motion from the ADV measurements. The presented data processing techniques are shown to allow the evaluated ADV to be effectively utilized for quantifying...
Show moreA motion compensated ADV system was evaluated to determine its ability to make measurements necessary for characterizing the variability of the ambient current in the Gulf Stream. The impact of IMU error relative to predicted turbulence spectra was quantified, as well as and the ability of the motion compensation approach to remove sensor motion from the ADV measurements. The presented data processing techniques are shown to allow the evaluated ADV to be effectively utilized for quantifying ambient current fluctuations from 0.02 to 1 Hz (50 to 1 seconds) for dissipation rates as low as 3x10-7. This measurement range is limited on the low frequency end by IMU error, primarily by the calculated transformation matrix, and on the high end by Doppler noise. Inshore testing has revealed a 0.37 Hz oscillation inherent in the towfish designed and manufactured as part of this project, which can nearly be removed using the IMU.
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Date Issued: 2014
PURL: http://purl.flvc.org/fau/fd/FA00004191, http://purl.flvc.org/fau/fd/FA00004191
Subject Headings: Fluid dynamic measurements, Fluid mechanics -- Mathematical models, Motion control systems, Ocean atmosphere interaction, Ocean circulation, Turbulence, Wave motion, Theory of
Format: Document (PDF)

Title: Evolution and application of a parallel algorithm for explicit transient finite element analysis on SIMD/MIMD computers.
Creator: Das, Partha S., Florida Atlantic University, Case, Robert O., Tsai, Chi-Tay, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The development of a parallel data structure and an associated elemental decomposition algorithm for explicit finite element analysis for massively parallel SIMD computer, the DECmpp 12000 (MasPar MP-1) machine, is presented, and then extended to implementation on the MIMD computer, Cray-T3D. The new parallel data structure and elemental decomposition algorithm are discussed in detail and is used to parallelize a sequential Fortran code that deals with the application of isoparametric...
Show moreThe development of a parallel data structure and an associated elemental decomposition algorithm for explicit finite element analysis for massively parallel SIMD computer, the DECmpp 12000 (MasPar MP-1) machine, is presented, and then extended to implementation on the MIMD computer, Cray-T3D. The new parallel data structure and elemental decomposition algorithm are discussed in detail and is used to parallelize a sequential Fortran code that deals with the application of isoparametric elements for the nonlinear dynamic analysis of shells of revolution. The parallel algorithm required the development of a new procedure, called an 'exchange', which consists of an exchange of nodal forces at each time step to replace the standard gather-assembly operations in sequential code. In addition, the data was reconfigured so that all nodal variables associated with an element are stored in a processor along with other element data. The architectural and Fortran programming language features of the MasPar MP-1 and Cray-T3D computers which are pertinent to finite element computations are also summarized, and sample code segments are provided to illustrate programming in a data parallel environment. The governing equations, the finite element discretization and a comparison between their implementation on Von Neumann and SIMD-MIMD parallel computers are discussed to demonstrate their applicability and the important differences in the new algorithm. Various large scale transient problems are solved using the parallel data structure and elemental decomposition algorithm and measured performances are presented and analyzed in detail. Results show that Cray-T3D is a very promising parallel computer for finite element computation. The 32 processors of this machine shows an overall speedup of 27-28, i.e. an efficiency of 85% or more and 128 processors shows a speedup of 70-77, i.e. an efficiency of 55% or more. The Cray-T3D results demonstrated that this machine is capable of outperforming the Cray-YMP by a factor of about 10 for finite element problems with 4K elements, therefore, the method of developing the parallel data structure and its associated elemental decomposition algorithm is recommended for implementation on other finite element code in this machine. However, the results from MasPar MP-1 show that this new algorithm for explicit finite element computations do not produce very efficient parallel code on this computer and therefore, the new data structure is not recommended for further use on this MasPar machine.
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Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/12500
Subject Headings: Finite element method, Algorithms, Parallel computers
Format: Document (PDF)

Title: The finite element method as a parametric tool in the design and analysis of a pressure vessel having a threaded closure.
Creator: Merkl, Garrett Andrew., Florida Atlantic University, Case, Robert O., Tsai, Chi-Tay, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The finite element method is a very powerful tool used to analyze a variety of problems in engineering. This thesis looks at the finite element method as a tool and several important modeling features of concern. A well known finite element software package, ANSYS, will be used to demonstrate a diverse number of its capabilities, and several procedures followed in solving a specific engineering problem. The subject matter involves a nonlinear contact analysis of a pressure vessel having a...
Show moreThe finite element method is a very powerful tool used to analyze a variety of problems in engineering. This thesis looks at the finite element method as a tool and several important modeling features of concern. A well known finite element software package, ANSYS, will be used to demonstrate a diverse number of its capabilities, and several procedures followed in solving a specific engineering problem. The subject matter involves a nonlinear contact analysis of a pressure vessel having a threaded closure. The choice of this application is prompted by an interest in better understanding how the finite element method is implemented in the design and analysis of different pressure vessel parameters. A parametric finite element analysis was performed. Load and stress distributions along the threaded region of the vessel were examined for parameters including number of threads, thread pitch, diameter ratio, closure plug length, and thread profile.
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Date Issued: 1996
PURL: http://purl.flvc.org/fcla/dt/15243
Subject Headings: Finite element method, Pressure vessels--Design and construction, Strains and stresses--Mathematical models
Format: Document (PDF)

Title: Improved design methods for evaluating the performance of landfill double liner systems.
Creator: Shivashankar, Mirle R., Florida Atlantic University, Fluet, J. E. Jr., Reddy, Dronnadula V., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: Many modern landfills are constructed with double liner systems. Leachate leakage rates through double liner systems are calculated using recently developed formulations which are theoretically correct for leakage detection system (LDS) materials that have unrestricted lateral flow properties. But their applicability to geonets, the most commonly used LDS material, has yet to be determined. In double liner systems, the leakage through the primary liner, the properties of the LDS material, and...
Show moreMany modern landfills are constructed with double liner systems. Leachate leakage rates through double liner systems are calculated using recently developed formulations which are theoretically correct for leakage detection system (LDS) materials that have unrestricted lateral flow properties. But their applicability to geonets, the most commonly used LDS material, has yet to be determined. In double liner systems, the leakage through the primary liner, the properties of the LDS material, and the slope of the LDS determine the flow patterns in the LDS. These flow patterns are then used to determine the amount of leachate, if any, which leaks through the bottom liner into the ground. This thesis describes the experimental determination of the flow patterns in the geonets and their relationships to established design formulations.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15197
Subject Headings: Sanitary landfills--Leaching, Sanitary landfills--Linings, Geosynthetics
Format: Document (PDF)

Title: THE APPLICATION OF THE ENERGY ACCOUNTANCY EQUATION IN THE INVESTIGATION OF ENERGY TRANSFER IN A THIN WALLED SHELL STRUCTURE.
Creator: SCHAPLEY, RAMON FRANK, II., Florida Atlantic University, Dunn, Stanley E., Cuschieri, Joseph M., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The Energy Accountancy method is used to describe the response of a system by accounting for the various energy components in a system, that is components describing the input energy, the energy dissipated, and the energy transfered by the system. These components are functions of quantities that can be determined either through measurement or finite element analysis of the system. This concept is used in this study to determine the response of a small diameter pipe containing two different...
Show moreThe Energy Accountancy method is used to describe the response of a system by accounting for the various energy components in a system, that is components describing the input energy, the energy dissipated, and the energy transfered by the system. These components are functions of quantities that can be determined either through measurement or finite element analysis of the system. This concept is used in this study to determine the response of a small diameter pipe containing two different fluids, air and water. The results of this study have shown that the Snergy Accountancy method can be used to describe the response of a thin walled shell structure with good results. It has also been shown in this study that in small diameter pipes the fluid contained by the system can be considered to act as a reactive medium in the response of the structure.
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Date Issued: 1985
PURL: http://purl.flvc.org/fcla/dt/14277
Subject Headings: Force and energy--Analysis, Force and energy--Measurement
Format: Document (PDF)

Title: The role of monitoring wells in modern landfill designs.
Creator: Reddi, Vinod Jayasankar, Florida Atlantic University, Fluet, J. E. Jr., Scarlatos, Panagiotis (Pete) D., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: Modem technology has led to a new generation of landfill liner systems that are highly efficient at intercepting and removing leachate. Many of the modem liner systems are so effective that little or no leakage occurs through the liner systems. What leakage may occur is so minimal that, although it can be theoretically predicted, it cannot be measured, i.e., the resulting groundwater concentrations are well beneath minimum detection levels of available monitoring well technology. In addition...
Show moreModem technology has led to a new generation of landfill liner systems that are highly efficient at intercepting and removing leachate. Many of the modem liner systems are so effective that little or no leakage occurs through the liner systems. What leakage may occur is so minimal that, although it can be theoretically predicted, it cannot be measured, i.e., the resulting groundwater concentrations are well beneath minimum detection levels of available monitoring well technology. In addition to being highly effective, some modem liner systems are constructed with two liners separated by a drainage medium which detects and removes any leakage through the top liner. These significant improvements in liner system technology have led many landfill designers, operators, and regulators to question the necessity for current monitoring well practices. Currently, landfills are required to have a large number of monitoring wells, and the associated large installation, sampling, and testing costs are inevitably reflected in higher tipping fees or higher taxes. In either case, the costs are borne by the public. If the number and frequency of sampling of monitoring wells could be reduced, significant cost savings could be realized, and the money saved could perhaps be better spent elsewhere. This thesis reports the results of research conducted at eleven landfills constructed with modem landfill liner systems to determine the actual and probable efficacy of the role o: monitoring wells, and conducts a cost-saving analysis to evaluate whether funds would have been better spent elsewhere.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/15019
Subject Headings: Fills (Earthwork), Leachate, Sanitary landfills--Linings, Waste disposal in the ground
Format: Document (PDF)

Title: Study of corrosion-induced failure mechanisms of epoxy-coated reinforcing steel.
Creator: Lee, Seung-Kyoung, Florida Atlantic University, Hartt, William H., McIntyre, Jack F., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A study of the corrosion protection afforded by epoxy coatings on reinforcing steel was performed. To accomplish this bars were acquired from ten sources and coatings were characterized in terms of defects, thickness, solvent extraction weight loss and hardness. Testing involved exposure in various aqueous solutions at both ambient temperature and 80$\sp\circ$C and in chloride-contaminated concrete slabs under outdoor exposure. Direct pull-off adhesion testing was performed on tested and...
Show moreA study of the corrosion protection afforded by epoxy coatings on reinforcing steel was performed. To accomplish this bars were acquired from ten sources and coatings were characterized in terms of defects, thickness, solvent extraction weight loss and hardness. Testing involved exposure in various aqueous solutions at both ambient temperature and 80$\sp\circ$C and in chloride-contaminated concrete slabs under outdoor exposure. Direct pull-off adhesion testing was performed on tested and virgin epoxy coated reinforcing steels (ECRs). Electrochemical impedance spectroscopy (EIS) scans were made periodically, and a curve fitting technique was employed to analyze coating parameters. Conventional electrochemical measurements were also made, and corrosion morphology of ECR specimens was examined. It was found that the density and size of coating defects was the primary factor affecting ECR performance. The circuit analysis indicated that poorly performing defect-free coatings absorbed water and oxygen; and these species reached the coating/substrate interface and electrochemical reactions at the interface caused coating degradation. By way of contrast, the impedance response for well-performing ECR specimens showed no signs of active degradation at the interface although diffusional processes similar to those noted for poorly performing bars occurred here also. Experimental results indicated a relationship between corrosion behavior and bar source. Weight loss upon solvent extraction correlated with impedance reduction from hot water exposure. Coating defects developed during most of the tests, especially in high pH solutions containing chloride ions. ECRs with excessive coating defects, either initially present or ones which developed in service, performed poorly in every test category regardless of source. Forms of coating failure were extensive rusting at defects, blistering, wet adhesion loss, cathodic delamination, underfilm corrosion and coating cracks. These occurred sequentially or concurrently, depending on the condition of the ECR and nature of the environment.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/12389
Subject Headings: Corrosion and anti-corrosives, Epoxy coatings, Steel--Corrosion, Concrete--Corrosion
Format: Document (PDF)

Title: NOVEL KIRIGAMI-INSPIRED FLEXIBLE ROBOTIC EXTENSION FOR MOBILE PLATFORMS.
Creator: Den Ouden, Casey, Su, Tsung-Chow, Ouyang, Bing, Florida Atlantic University, Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science
Abstract/Description: Since 2010, aquaculture practices have produced 70% of global seafood consumption. However, this fast-growing sector of agriculture has yet to see the adoption of advanced technologies to improve farm operations. The Hybrid Aerial Underwater robotiCs System (HAUCS) is an Internet of Things (IoT) framework that aims to bring transformative changes to pond aquaculture. This project focuses on the latest developments in the HAUCS mobile sensing platform and field deployment. A novel rigid...
Show moreSince 2010, aquaculture practices have produced 70% of global seafood consumption. However, this fast-growing sector of agriculture has yet to see the adoption of advanced technologies to improve farm operations. The Hybrid Aerial Underwater robotiCs System (HAUCS) is an Internet of Things (IoT) framework that aims to bring transformative changes to pond aquaculture. This project focuses on the latest developments in the HAUCS mobile sensing platform and field deployment. A novel rigid Kirigami-based robotic extension subsystem was created to expand the functionality of the HAUCS platform. The primary objective of this design was to limit the surface area of an extender arm on the drone during flight operations and minimize the in-flight drag. By utilizing a novel combination of shape memory polymer (SMP) and nitinol to extend and retrieve the sensing arm, the structure was able to conserve energy while operating under varying environmental conditions.
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Date Issued: 2023
PURL: http://purl.flvc.org/fau/fd/FA00014324
Subject Headings: Aquaculture, Sensors, Robotics
Format: Document (PDF)

Title: Small Anodic Polarization as a Mean to Modestly Accelerate Rebar Corrosion.
Creator: da Silveira, Gabrielle Pimentel, Presuel-Moreno, Francisco, Pierre-Philippe, Beaujean, Florida Atlantic University, Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science
Abstract/Description: The study of non-invasive techniques to analyze the propagation of corrosion in steel reinforced concrete structures proves to be a great alternative to better understanding the corrosive process of rebar and increasing its useful life. The study presented in this document examines the evolution of steel reinforced concrete corrosion over time by applying a small anodic current over four samples, one with a single rebar (16X) and three with three rebars. The rebars were interconnected to...
Show moreThe study of non-invasive techniques to analyze the propagation of corrosion in steel reinforced concrete structures proves to be a great alternative to better understanding the corrosive process of rebar and increasing its useful life. The study presented in this document examines the evolution of steel reinforced concrete corrosion over time by applying a small anodic current over four samples, one with a single rebar (16X) and three with three rebars. The rebars were interconnected to apply the anodic current and accelerate their corrosion. Galvanostatic Pulse (GP) was used. This method applies a constant current pulse to the rebar for 150 seconds while monitoring the potential of the rebars. Each rebar's corrosion current was assessed using GP measurements when no anodic current was applied, and the rebars were disconnected. Sample 16X additionally underwent ultrasonic acoustic analysis by collecting the surface and rebar echo response with a transducer and modeling the sound propagation for poroelastic media with an adapted version of the novel Biot-Stoll method.
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Date Issued: 2024
PURL: http://purl.flvc.org/fau/fd/FA00014491
Subject Headings: Reinforced concrete--Corrosion, Reinforced concrete--Analysis, Nondestructive testing
Format: Document (PDF)

Title: Feeling the beat: a smart hand exoskeleton for learning to play musical instruments.
Creator: Maohua Lin, Rudy Paul, Moaed Abd, James Jones, Darryl Dieujuste, Harvey Chim, Erik D. Engeberg
Abstract/Description: Individuals who have suffered neurotrauma like a stroke or brachial plexus injury often experience reduced limb functionality. Soft robotic exoskeletons have been successful in assisting rehabilitative treatment and improving activities of daily life but restoring dexterity for tasks such as playing musical instruments has proven challenging. This research presents a soft robotic hand exoskeleton coupled with machine learning algorithms to aid in relearning how to play the piano by ‘feeling’...
Show moreIndividuals who have suffered neurotrauma like a stroke or brachial plexus injury often experience reduced limb functionality. Soft robotic exoskeletons have been successful in assisting rehabilitative treatment and improving activities of daily life but restoring dexterity for tasks such as playing musical instruments has proven challenging. This research presents a soft robotic hand exoskeleton coupled with machine learning algorithms to aid in relearning how to play the piano by ‘feeling’ the difference between correct and incorrect versions of the same song. The exoskeleton features piezoresistive sensor arrays with 16 taxels integrated into each fingertip. The hand exoskeleton was created as a single unit, with polyvinyl acid (PVA) used as a stent and later dissolved to construct the internal pressure chambers for the five individually actuated digits. Ten variations of a song were produced, one that was correct and nine containing rhythmic errors. To classify these song variations, Random Forest (RF), K-Nearest Neighbor (KNN), and Artificial Neural Network (ANN) algorithms were trained with data from the 80 taxels combined from the tactile sensors in the fingertips. Feeling the differences between correct and incorrect versions of the song was done with the exoskeleton independently and while the exoskeleton was worn by a person. Results demonstrated that the ANN algorithm had the highest classification accuracy of 97.13% ± 2.00% with the human subject and 94.60% ± 1.26% without. These findings highlight the potential of the smart exoskeleton to aid disabled individuals in relearning dexterous tasks like playing musical instruments.
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Date Issued: 2023
PURL: http://purl.flvc.org/fau/fd/FAUIR000534
Format: Document (PDF)

Title: Location-Aware Source Routing Protocol for Underwater Acoustic Networks of AUVs.
Creator: Carlson, Edward A., Beaujean, Pierre-Philippe J., An, Edgar
Date Issued: 2012
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.1155_2012_765924_1629746277
Format: Citation

Title: MIMO Underwater Acoustic Communications in Ports and Shallow Waters at Very High Frequency.
Creator: Real, Gaultier, Beaujean, Pierre-Philippe, Bouvet, Pierre-Jean
Date Issued: 2013-10-11
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.3390_jsan2040700_1632229234
Format: Citation

Title: Task Allocation and Path Planning for Collaborative Autonomous Underwater Vehicles Operating through an Underwater Acoustic Network.
Creator: Deng, Yueyue, Beaujean, Pierre-Philippe J., An, Edgar, Carlson, Edward
Date Issued: 2013
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.1155_2013_483095_1629813605
Format: Citation

Title: Design and assessment of a flexible fish robot actuated by shape memory alloys.
Creator: Coral, William, Rossi, Claudio, Curet, Oscar M, Castro, Diego
Date Issued: 2018-07-31
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.1088_1748-3190_aad0ae_1642527471
Format: Document (PDF)

Title: Hydrodynamics of mangrove-type root models: the effect of porosity, spacing ratio and flexibility.
Creator: Kazemi, Amirkhosro, Van de Riet, Keith, Curet, Oscar M
Date Issued: 2017-09-21
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.1088_1748-3190_aa7ccf_1642522620
Format: Document (PDF)

Title: Fluid dynamics of the larval zebrafish pectoral fin and the role of fin bending in fluid transport.
Creator: Green, Matthew H, Curet, Oscar M, Patankar, Neelesh A, Hale, Melina E
Date Issued: 2012-12-05
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.1088_1748-3182_8_1_016002_1642521175
Format: Document (PDF)

Title: Dorsal root ganglia neurite outgrowth measured as a function of changes in microelectrode array resistance.
Creator: Jordan M. Renna, Jessica M. Stukel, Rebecca Kuntz Willits, Erik D. Engeberg
Abstract/Description: Current research in prosthetic device design aims to mimic natural movements using a feedback system that connects to the patient's own nerves to control the device. The first step in using neurons to control motion is to make and maintain contact between neurons and the feedback sensors. Therefore, the goal of this project was to determine if changes in electrode resistance could be detected when a neuron extended a neurite to contact a sensor. Dorsal root ganglia (DRG) were harvested from...
Show moreCurrent research in prosthetic device design aims to mimic natural movements using a feedback system that connects to the patient's own nerves to control the device. The first step in using neurons to control motion is to make and maintain contact between neurons and the feedback sensors. Therefore, the goal of this project was to determine if changes in electrode resistance could be detected when a neuron extended a neurite to contact a sensor. Dorsal root ganglia (DRG) were harvested from chick embryos and cultured on a collagencoated carbon nanotube microelectrode array for two days. The DRG were seeded along one side of the array so the processes extended across the array, contacting about half of the electrodes. Electrode resistance was measured both prior to culture and after the two day culture period. Phase contrast images of the microelectrode array were taken after two days to visually determine which electrodes were in contact with one or more DRG neurite or tissue. Electrodes in contact with DRG neurites had an average change in resistance of 0.15 MΩ compared with the electrodes without DRG neurites. Using this method, we determined that resistance values can be used as a criterion for identifying electrodes in contact with a DRG neurite. These data are the foundation for future development of an autonomous feedback resistance measurement system to continuously monitor DRG neurite outgrowth at specific spatial locations.
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Date Issued: 2017
PURL: http://purl.flvc.org/fau/fd/FAUIR000503
Format: Document (PDF)

Title: A generalized model for communicating individuality through teleost swim bladder modulation.
Creator: Matthews, Cameron A., Beaujean, Pierre-Philippe J.
Date Issued: 2018-01-01
PURL: http://purl.flvc.org/fau/flvc_fau_islandoraimporter_10.1242_bio.023515_1632231130
Format: Citation

Title: Enhancing Fatigue Performance of Sandwich Composites with Nanophased Core.
Creator: Zainuddin, S., Mahfuz, Hassan, Jeelani, S.
Date Issued: 2010
PURL: http://purl.flvc.org/fau/fd/FAUIR000169
Format: Citation

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