View All Items

Title: Comparative analysis and application of various design for assembly methodologies to the design of electro-mechanical products.
Creator: Bhattacharya, Soumitra Sanat., Florida Atlantic University, Mazouz, Abdel Kader
Abstract/Description: This thesis presents a methodology of Comparative Analysis of different Design for Assembly (DFA) Methods. Three DFA methods, Boothroyd's Design for Assembly, Design for Assembly Guidelines and Value Analysis are compared. A "Select DFA Software," is developed using Turbo C++, which would enable a product designer to make a comparative analysis of different DFA methods from which the designer can chose from. In using the Software the designer is not required to know in detail the different...
Show moreThis thesis presents a methodology of Comparative Analysis of different Design for Assembly (DFA) Methods. Three DFA methods, Boothroyd's Design for Assembly, Design for Assembly Guidelines and Value Analysis are compared. A "Select DFA Software," is developed using Turbo C++, which would enable a product designer to make a comparative analysis of different DFA methods from which the designer can chose from. In using the Software the designer is not required to know in detail the different DFA methods. Responses to, easy to understand factors that affect the selection of a DFA method enables the designer to use the Software meaningfully. Two case studies are conducted for application of the DFA Software and the three different DFA methods.
Show less
Date Issued: 1992
PURL: http://purl.flvc.org/fcla/dt/14845
Subject Headings: Assembly-line methods, Production engineering, Engineering design--Data processing, Computer-aided design, Manufacturing processes--Automation
Format: Document (PDF)

Title: Computer-aided design of speed humps.
Creator: Joseph, Philip Puthooppallil., Florida Atlantic University, Wong, Tin-Lup
Abstract/Description: A six-degree-of-freedom model of a vehicle was simulated over different hump profiles with a computer program and the results were verified. The resulting vibration characteristics were analyzed to calculate a discomfort index. The discomfort index considered is the equivalent root mean square acceleration specified by the proposal for the revision of ISO 2631. A parametric study was conducted to find the sensitivity of different hump and vehicular parameters on the ride comfort. The optimal...
Show moreA six-degree-of-freedom model of a vehicle was simulated over different hump profiles with a computer program and the results were verified. The resulting vibration characteristics were analyzed to calculate a discomfort index. The discomfort index considered is the equivalent root mean square acceleration specified by the proposal for the revision of ISO 2631. A parametric study was conducted to find the sensitivity of different hump and vehicular parameters on the ride comfort. The optimal hump parameters were obtained for different limiting speeds. Two field humps were simulated and modification of the humps is suggested for optimum performance.
Show less
Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14920
Subject Headings: Speed reducers--Data processing, Traffic engineering, Automobiles--Vibration
Format: Document (PDF)

Title: A DATA ACQUISITION AND PROCESSING SYSTEM FOR THE STUDY OF PERIPHERAL VASCULAR DYNAMICS.
Creator: CIKIKCI, ISMAIL OGUZ., Florida Atlantic University, Shankar, Ravi
Abstract/Description: In this study, electrical impedance plethysmograph was used to measure the nonlinear elastic properties of the leg arteries. Two methods were used. In method one, a pressure cuff was wrapped around the lower leg and the recordings were made from under the cuff. Also a second set of recordings were made at a site distal to the cuff, to determine the attenuation of blood pressure pulse by the cuff at cuff pressures above diastolic. In method 2 an Inverter was used and recordings were made from...
Show moreIn this study, electrical impedance plethysmograph was used to measure the nonlinear elastic properties of the leg arteries. Two methods were used. In method one, a pressure cuff was wrapped around the lower leg and the recordings were made from under the cuff. Also a second set of recordings were made at a site distal to the cuff, to determine the attenuation of blood pressure pulse by the cuff at cuff pressures above diastolic. In method 2 an Inverter was used and recordings were made from the same segment. Also recordings were made from the upper arm at the heart level to define the blood pressure pulse, that causes the volume change in the leg arteries. A wide range of pressures were used and V-P and compliance curves were calculated with both the methods. In order to improve the accuracy and reduce operator errors, a personal computer based data acquisition and processing system was developed.
Show less
Date Issued: 1986
PURL: http://purl.flvc.org/fcla/dt/14338
Subject Headings: Arteries, Electronic data processing--Medicine, Diagnosis, Noninvasive
Format: Document (PDF)

Title: Development of an intelligent fuzzy obstacle avoidance system using SONAR modeling and simulation.
Creator: Bouxsein, Philip A., Florida Atlantic University, An, Edgar
Abstract/Description: Response time to a threat or incident for coastline security is an area needing improvement. Currently, the U.S. Coast Guard is tasked with monitoring and responding to threats in coastal and port environments using boats or planes, and SCUBA divers. This can significantly hinder the response time to an incident. A solution to this problem is to use autonomous underwater vehicles (AUVs) to continuously monitor a port. The AUV must be able to navigate the environment without colliding into...
Show moreResponse time to a threat or incident for coastline security is an area needing improvement. Currently, the U.S. Coast Guard is tasked with monitoring and responding to threats in coastal and port environments using boats or planes, and SCUBA divers. This can significantly hinder the response time to an incident. A solution to this problem is to use autonomous underwater vehicles (AUVs) to continuously monitor a port. The AUV must be able to navigate the environment without colliding into objects for it to operate effectively. Therefore, an obstacle avoidance system (OAS) is essential to the activity of the AUV. This thesis describes a systematic approach to characterize the OAS performance in terms of environments, obstacles, SONAR configuration and signal processing methods via modeling and simulation. A fuzzy logic based OAS is created using the simulation. Subsequent testing of the OAS demonstrates its effectiveness in unknown environments.
Show less
Date Issued: 2006
PURL: http://purl.flvc.org/fcla/dt/13390
Subject Headings: Fuzzy logic, Submersibles--Automatic control, Neural networks (Computer science), Underwater acoustics--Computer simulation, Sonar--Computer simulation
Format: Document (PDF)

Title: Digital implementation of Alopex: HDL simulation studies.
Creator: Freytag, Lynn R., Florida Atlantic University, Shankar, Ravi
Abstract/Description: Alopex is a stochastic algorithm used to solve optimization problems in various types of systems. This thesis describes behavioral and structural hardware-description-language models which were developed for a three-stage VLSI-implementable Alopex architecture. The architecture features an SIMD structure and no communication between processing elements (PEs). Several approximations and simplifications were tested using the models to achieve a simple PE architecture and to implement the...
Show moreAlopex is a stochastic algorithm used to solve optimization problems in various types of systems. This thesis describes behavioral and structural hardware-description-language models which were developed for a three-stage VLSI-implementable Alopex architecture. The architecture features an SIMD structure and no communication between processing elements (PEs). Several approximations and simplifications were tested using the models to achieve a simple PE architecture and to implement the algorithm using integer arithmetic. Simulations were conducted with numerical image input to check the validity of these changes, and the timing relationships between PEs and controllers were explored. The use of a hardware description language provided an easy way to investigate timing and make architectural changes. The algorithm was found to function correctly under the digital hardware constraints and simplifications. The timing results gave an indication of the execution time for each step and pointed out areas in which the architecture may need to be improved.
Show less
Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14650
Subject Headings: Computer hardware description languages--Simulation methods
Format: Document (PDF)

Title: Driveability of concrete piles pretensioned with CFRP.
Creator: Gemmell, Thomas Scott., Florida Atlantic University, Arockiasamy, Madasamy
Abstract/Description: Four concrete piles prestressed with Carbon Fiber Reinforced Plastics were cast, in which two piles were fabricated with CFRP transverse reinforcement. The remaining two were provided with transverse steel spiral reinforcement. The piles were designed according to Florida Department of Transportation (FDOT) guidelines. The Pile Driving Analyzer (PDA) was chosen as the primary data acquisition system for the pile driving due to its mobility, reliability and robustness based on the high...
Show moreFour concrete piles prestressed with Carbon Fiber Reinforced Plastics were cast, in which two piles were fabricated with CFRP transverse reinforcement. The remaining two were provided with transverse steel spiral reinforcement. The piles were designed according to Florida Department of Transportation (FDOT) guidelines. The Pile Driving Analyzer (PDA) was chosen as the primary data acquisition system for the pile driving due to its mobility, reliability and robustness based on the high frequency excitation. The Pre-driving analysis consisted of several stages. The estimated static bearing capacity of the experimental piles was first calculated followed by SPT sampling at the pile driving site to obtain the soil conditions. The percent skin and toe friction, ultimate capacities, driving system parameters, maximum displacements, energy, integrity, tensions and static capacity were determined prior to pile driving. The piles were then driven and the data from the pile driving compared with the analysis.
Show less
Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/15496
Subject Headings: Concrete piling, Fiber reinforced plastics, Prestressed concrete
Format: Document (PDF)

Title: Development of Internet-based data management and retrieval schemes for AUV applications.
Creator: Bayard, Gildas Yann., Florida Atlantic University, An, Edgar
Abstract/Description: The rapid increase in the amount of data gathered by Autonomous Underwater Vehicles (AUV) leads to a global data management issue. Indeed, this large data collection effort is only interesting if the data collected can be easily retrieved and analyzed by many researchers. The main contribution of this thesis is the design of data management and retrieval schemes useful to the whole AUV community that both simplify the access and treatment of the data collected. This is achieved by the use of...
Show moreThe rapid increase in the amount of data gathered by Autonomous Underwater Vehicles (AUV) leads to a global data management issue. Indeed, this large data collection effort is only interesting if the data collected can be easily retrieved and analyzed by many researchers. The main contribution of this thesis is the design of data management and retrieval schemes useful to the whole AUV community that both simplify the access and treatment of the data collected. This is achieved by the use of a self-describing standard data format (Hierarchical Data Format) and the use of Internet browsers' file download ability. Recent developments in Sun's Java applet technology have been used to provide a user-friendly Graphical User Interface (GUI) so that the user can select data files according to a large number of parameters (what variables have been collected, when and where).
Show less
Date Issued: 1999
PURL: http://purl.flvc.org/fcla/dt/15687
Subject Headings: Submersibles--Data processing, Java (Computer program language), Application software--Development
Format: Document (PDF)

Title: Modeling of shallow water ambient noise directionality using the effective depth approximation.
Creator: Galletta, Frank Anton., Florida Atlantic University, Glegg, Stewart A. L.
Abstract/Description: A theoretical model has been developed to compute the vertical array directional response for surface generated ambient noise in a shallow water environment. The cross spectrum function is based on a normal mode solution to the wave equation in which the effective depth approximation is used to yield closed form solutions for two distinct mode types. The effective depth modes encompass the shallowest grazing angles where the bottom reacts as a pressure release surface to the incident plane...
Show moreA theoretical model has been developed to compute the vertical array directional response for surface generated ambient noise in a shallow water environment. The cross spectrum function is based on a normal mode solution to the wave equation in which the effective depth approximation is used to yield closed form solutions for two distinct mode types. The effective depth modes encompass the shallowest grazing angles where the bottom reacts as a pressure release surface to the incident plane waves. The rigid bottom solution takes over as the grazing angle increases and attenuation becomes significant. The computed vertical array beam output was compared to other models including a fast field wavenumber integration method and a multipath eigenray method with mixed results. The results indicated good agreement for both comparisons with the realization that the effective depth model is sensitive to the approximation discontinuity at the mode transition point.
Show less
Date Issued: 1996
PURL: http://purl.flvc.org/fcla/dt/15237
Subject Headings: Underwater acoustics--Measurement, Noise--Measurement, Acoustic surface waves
Format: Document (PDF)

Title: Model experiments for the acoustic field in a water column which includes the effects of shear in marine sediments.
Creator: Hundley, Allen John., Florida Atlantic University, Glegg, Stewart A. L.
Abstract/Description: A scaled, horizontally stratified shallow water marine acoustic model is constructed for the purpose of investigating the sound field resulting from long range propagation. The characteristics of this sound field in the water column are strongly dependent upon properties of the surficial sediment. One effect is the conversion from compressional waves in the water column to shear waves in the sediment at grazing angles less than the critical. To model a shallow marine environment, concrete is...
Show moreA scaled, horizontally stratified shallow water marine acoustic model is constructed for the purpose of investigating the sound field resulting from long range propagation. The characteristics of this sound field in the water column are strongly dependent upon properties of the surficial sediment. One effect is the conversion from compressional waves in the water column to shear waves in the sediment at grazing angles less than the critical. To model a shallow marine environment, concrete is used as a substrate rock and laminating epoxy is used to model a surficial sediment. Preliminary tests of the effects of the model's environment are performed, and the range dependent sound field as a function of depth is measured for several CW frequencies. These sound field profiles are compared with an approximate predictive theory, and with a numerical solution which treats the sediment properties exactly.
Show less
Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14618
Subject Headings: Underwater acoustics, Marine sediments--Acoustic properties
Format: Document (PDF)

$Mode II interlaminar fracture toughness of interleaved composite materials$

Title: Mode II interlaminar fracture toughness of interleaved composite materials.
Creator: Aksoy, Adnan., Florida Atlantic University, Carlsson, Leif A.
Abstract/Description: Interlaminar mode II fracture toughness, GIIC, of thermoset and thermoplastic interleaved (TSI and TPI) composites were investigated over a wide range of interleaf thickness. TPI specimens had four to about seven times larger GIIC than those without an interleaf. Poor adhesion observed for some TPI specimens were likely to be due to contaminated film materials. Thermoset interleaves were less effective in enhancing the mode II fracture toughness. However, even 0.043 mm thermoset interleaves...
Show moreInterlaminar mode II fracture toughness, GIIC, of thermoset and thermoplastic interleaved (TSI and TPI) composites were investigated over a wide range of interleaf thickness. TPI specimens had four to about seven times larger GIIC than those without an interleaf. Poor adhesion observed for some TPI specimens were likely to be due to contaminated film materials. Thermoset interleaves were less effective in enhancing the mode II fracture toughness. However, even 0.043 mm thermoset interleaves gave three times larger G$\sb{\rm IIC}$ than those without an interleaf. Estimates of the volume of the yielded material around the crack tip based on a quasi-elastic finite element approach and Irwin's model showed that the yield zone height reaches a peak value for increasing interleaf thickness for both TSI and TPI specimens. Furthermore, fracture toughness data correlates well with yield zone heights.
Show less
Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14594
Subject Headings: Composite materials--Cracking, Fracture mechanics, Composite materials--Testing
Format: Document (PDF)

Title: Motion Compensation of an Ultra Short Baseline Array for the Acoustic Positioning of an Underwater Vehicle for Port Operations.
Creator: Bon, Antoine, Beaujean, Pierre-Philippe, Florida Atlantic University
Abstract/Description: A Motion Compensated (MC) Ultra Short Baseline (USBL) Acoustic Positioning System (APS) operable in shallow water and port environment has been implemented at Florida Atlantic University. Multi-tones signal modulation and log-likelihood maximization enable this APS to operate in volumes of water of less than 10 cubic meters. Standard deviations of the acoustic source elevation and azimuth estimates were computed to be 3 degrees in an 8 cubic meters test tank, and reduce to 0.9 degree in a 2...
Show moreA Motion Compensated (MC) Ultra Short Baseline (USBL) Acoustic Positioning System (APS) operable in shallow water and port environment has been implemented at Florida Atlantic University. Multi-tones signal modulation and log-likelihood maximization enable this APS to operate in volumes of water of less than 10 cubic meters. Standard deviations of the acoustic source elevation and azimuth estimates were computed to be 3 degrees in an 8 cubic meters test tank, and reduce to 0.9 degree in a 2 meters deep marina. The motion compensating system estimates the array position and orientation while merging noisy measurements from a Magnetic, Angular Rate, and Gravity (MARG) sensor and a Differential Global Positioning System (DGPS) using Kalman filters. Experiments show 0.67 and 2.67 degrees of error for the array tilt and heading estimates, and 0.74 meter for the array position estimate.
Show less
Date Issued: 2007
PURL: http://purl.flvc.org/fau/fd/FA00012507
Subject Headings: Underwater navigation, Acoustical engineering, Adaptive signal processing, Underwater acoustic telemetry
Format: Document (PDF)

Title: NOISE CONSIDERATIONS IN DIGITAL SYSTEMS.
Creator: FENNELL, ROBERT DEWAYNE., Florida Atlantic University, Graham, Peter
Abstract/Description: The use of digital circuits in incre asingly diverse applications and environments has greatly increased the probability of electromagnetic interference in digital machines. The source and control of noise in digital systems have become major considerations in hardware design. This paper addresses these problems and their solutions. The noise immunities of various semiconductor families are compared showing design tradeoffs. The effects of transmission line reflections on digital wave forms...
Show moreThe use of digital circuits in incre asingly diverse applications and environments has greatly increased the probability of electromagnetic interference in digital machines. The source and control of noise in digital systems have become major considerations in hardware design. This paper addresses these problems and their solutions. The noise immunities of various semiconductor families are compared showing design tradeoffs. The effects of transmission line reflections on digital wave forms are analyzed. The means for calculating interference between conductors (crosstalk) are shown with appropriate approximations. The effects of shielding conductors and circuitry are explored with formulas for near field calculations shown. Proper grounding and power supply decoupling methods are shown to be paramount to proper system design. The paper ends with an approximate noise analysis of a simple computing machine.
Show less
Date Issued: 1978
PURL: http://purl.flvc.org/fcla/dt/13915
Subject Headings: Noise control, Digital electronics
Format: Document (PDF)

Title: Multi-path parameter and source localization for 2.4 GHz ISM radio band.
Creator: Hutasingh, Allapon., Florida Atlantic University, Helmken, Henry
Abstract/Description: Wireless communication has become a significant part of our life. Bluetooth(TM) Radio system is one example of wireless communication, Wireless Local Area Network (WLAN) is another example of wireless technology. Both of systems operate in the same frequency band, the Industrial Scientific Medical (ISM) band, which use a 2.4 GHz carrier frequency. According characteristic of system, multi-path effect are major concern for indoor propagation. A frequency sounding technique is introduced to...
Show moreWireless communication has become a significant part of our life. Bluetooth(TM) Radio system is one example of wireless communication, Wireless Local Area Network (WLAN) is another example of wireless technology. Both of systems operate in the same frequency band, the Industrial Scientific Medical (ISM) band, which use a 2.4 GHz carrier frequency. According characteristic of system, multi-path effect are major concern for indoor propagation. A frequency sounding technique is introduced to determine characteristics of the multi-path signal. However, multi-path can not be evaluated directly; some parameters are measured to determine the effect of multi-path. Angles of arrival can be used to facilitate the effect of multi-path signal. Using MatLab programming, Spatial Filter Periodogram (SPF) is introduced to estimate angles of arrival.
Show less
Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12839
Subject Headings: Radio wave propagation, Bluetooth technology
Format: Document (PDF)

Title: Modular application server design for AUV data network access and distributed processing.
Creator: Delarue, Alexandre G., Florida Atlantic University, Smith, Samuel M.
Abstract/Description: Autonomous Underwater Vehicles (AUV) collect a large volume of scientific data in every mission, using the onboard sensors, and store them in log files. The accessibility of these data is limited. Specific tools are required to extract the data to be processed on the user workstation with the installed analysis tools and scripts. The objective is to standardize and simplify the way data can be retrieved and processed from anywhere by anybody. The design of a server that manages the access to...
Show moreAutonomous Underwater Vehicles (AUV) collect a large volume of scientific data in every mission, using the onboard sensors, and store them in log files. The accessibility of these data is limited. Specific tools are required to extract the data to be processed on the user workstation with the installed analysis tools and scripts. The objective is to standardize and simplify the way data can be retrieved and processed from anywhere by anybody. The design of a server that manages the access to the data and to the applications that process them has been considered. Everything can then be done through the use of a single Java client executed on any Java compliant computer. Analysis tools are downloaded on the fly when needed and do not require any installation. New tools can be integrated into the application server in the form of plugins developed with an appropriate Java Library.
Show less
Date Issued: 2000
PURL: http://purl.flvc.org/fcla/dt/12676
Subject Headings: Submersibles--Data processing, Java (Computer program language), Client/server computing
Format: Document (PDF)

Title: Modelling of underwater ambient noise due to whitecaps.
Creator: Elisseeff, Pierre., Florida Atlantic University, Glegg, Stewart A. L.
Abstract/Description: A theoretical model accounting for underwater ambient noise due to whitecap-generated bubbles and drop-impacts is developed to investigate the possible mechanisms of ocean noise generation. A general analysis is laid down, leading to expressions of the noise spectrum in an undefined environment. Subsequently the cases of isovelocity and stratified deep oceans are considered, and specific expressions are derived. The stratified deep ocean estimations of the directional spectrum are then...
Show moreA theoretical model accounting for underwater ambient noise due to whitecap-generated bubbles and drop-impacts is developed to investigate the possible mechanisms of ocean noise generation. A general analysis is laid down, leading to expressions of the noise spectrum in an undefined environment. Subsequently the cases of isovelocity and stratified deep oceans are considered, and specific expressions are derived. The stratified deep ocean estimations of the directional spectrum are then compared to experimental data and a good agreement is found. Finally the absolute noise levels due to bubbles and drop impacts are discussed, and bubble noise is found to be larger than drop impact noise. The collective bubble oscillation hypothesis is also discussed, and although clues are given for and against this hypothesis no rigorous justification for this has been found.
Show less
Date Issued: 1992
PURL: http://purl.flvc.org/fcla/dt/14784
Subject Headings: Underwater acoustics--Measurement, Acoustic surface waves
Format: Document (PDF)

Title: Modular software design methodology in a social context: Its use on large projects.
Creator: Hayes, William D., Florida Atlantic University, Coulter, Neal S.
Abstract/Description: The history of software development reflects a continuous series of problems, crises and triumphs in the development of reliable software systems. Problems with comprehension of machine language led to assemblers and high level languages, and eventually to the discipline of structured programming. Problems with program and system size led to modularity and modular design. None of these solutions proved to be final because aspirations have risen along with competence. This thesis makes the...
Show moreThe history of software development reflects a continuous series of problems, crises and triumphs in the development of reliable software systems. Problems with comprehension of machine language led to assemblers and high level languages, and eventually to the discipline of structured programming. Problems with program and system size led to modularity and modular design. None of these solutions proved to be final because aspirations have risen along with competence. This thesis makes the argument that the increasing size of projects, in terms of their complexity and the numbers of persons required to bring them to fruition, gives rise to a set of problems caused by the social interaction of those persons. This social context is investigated. It is argued that solutions ignoring this social context are inadequate for solving the software crisis brought on by the increasing demand for larger software systems.
Show less
Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14652
Subject Headings: Computer programming management, Software engineering--Management, Computer programmers
Format: Document (PDF)

Title: Modeling the forward look sonar.
Creator: Barrault, Guillaume., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description: A numerical model that simulates the operation of a Forward Look Scan Sonar (FLSS) has been developed in this thesis. The model discretizes the sonar-projected signal by a set of rays using a geometrical approach. Bending of the rays due to varying acoustic wave speed is neglected. Simulated raw sonar data are generated, and used as input in the sonar processing algorithms to generate sonar images. Using the model, the influence of, the most critical characteristics of the sonar, including...
Show moreA numerical model that simulates the operation of a Forward Look Scan Sonar (FLSS) has been developed in this thesis. The model discretizes the sonar-projected signal by a set of rays using a geometrical approach. Bending of the rays due to varying acoustic wave speed is neglected. Simulated raw sonar data are generated, and used as input in the sonar processing algorithms to generate sonar images. Using the model, the influence of, the most critical characteristics of the sonar, including phase variations among the channels, non-homogeneous channel amplitude, and the number of bad channels, on the quality of the sonar image is determined. The results of the model are compared to real data from a low frequency FLS sonar (250 KHz) and a high frequency FLS sonar (600 KHz). There is good matching between the simulation and the operation of the two sonars and the performance was markedly enhanced by using the modeling results.
Show less
Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12733
Subject Headings: Sonar, Underwater acoustics, Remote submersibles
Format: Document (PDF)

Title: Modeling the acoustic signature of an Ocean Explorer class autonomous underwater vehicle.
Creator: Debiesme, Francois-Xavier., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description: Autonomous Underwater Vehicles (AUV) rely on acoustics for a number of mission functions such as communications (Acoustic Modem) and vision (Forward and Side Looking Sonars). The AUV acoustic signature (self-noise and vibration) can thus interfere with AUV operations. Additionally, underwater measurements such as turbulence measurements can be contaminated by interference between the AUV generated acoustics pressures and the low pressures of the turbulence. In this thesis a Finite Element and...
Show moreAutonomous Underwater Vehicles (AUV) rely on acoustics for a number of mission functions such as communications (Acoustic Modem) and vision (Forward and Side Looking Sonars). The AUV acoustic signature (self-noise and vibration) can thus interfere with AUV operations. Additionally, underwater measurements such as turbulence measurements can be contaminated by interference between the AUV generated acoustics pressures and the low pressures of the turbulence. In this thesis a Finite Element and Boundary Element approach is developed to characterize the self-noise (vibration and radiated sound pressure) of a simplified FAU Ocean Explorer AUV. Mechanical excitation from the "podule", which contains the motors for the propulsion and motion control, is assumed in the analysis. The low frequency (less than 1Khz) results are dominated by two types of modes. One type associated with the motion of the "podule" as a rigid body on the vibration isolation supports that connects it to the rest of the AUV structure. The second type is associated with local structural deformations of the "podule", support frame, and AUV hull. Modifying the stiffness of the supports reduces the frequency of the rigid body modes of the "podule", but does not influence the frequencies of the local structural deformations of the "podule" and the rest of the AUV. Decreasing the stiffness of the supports should result in a reduced AUV acoustic signature.
Show less
Date Issued: 2000
PURL: http://purl.flvc.org/fcla/dt/15764
Subject Headings: Oceanographic submersibles, Underwater acoustics, Acoustic models
Format: Document (PDF)

Title: Modeling use cases and their sequences in object-oriented analysis.
Creator: Anwar, Mahbub Morshed., Florida Atlantic University, Fernandez, Eduardo B.
Abstract/Description: Use cases and scenarios are used by most of the object-oriented modeling approaches for capturing users' requirements, analyzing the system and building the test cases. All the different methodologies have different approaches for modeling use cases and applying them to other object-oriented models. Use case models help the analyst to construct dynamic as well as static models. In this thesis, we show an approach of modeling use cases for object-oriented software analysis. We give emphasis to...
Show moreUse cases and scenarios are used by most of the object-oriented modeling approaches for capturing users' requirements, analyzing the system and building the test cases. All the different methodologies have different approaches for modeling use cases and applying them to other object-oriented models. Use case models help the analyst to construct dynamic as well as static models. In this thesis, we show an approach of modeling use cases for object-oriented software analysis. We give emphasis to modeling the sequences of the activities within the scenarios and the sequences of the scenarios throughout the system. We show how these sequences influence the static model (object diagram) and dynamic model (state diagram). We propose an Integrated State diagram for dynamic modeling and an Object Interaction diagram for modeling the flows of the scenarios throughout the system by applying the use case sequence models. Our approaches are demonstrated by solving a variety of examples.
Show less
Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/15389
Subject Headings: Object-oriented methods (Computer science)
Format: Document (PDF)

Title: Feasibility study of a prestressed concrete double-tee bridge system for interstate highways.
Creator: Badve, Anil Pandurang., Florida Atlantic University, Reddy, Dronnadula V.
Abstract/Description: This dissertation is a study of 1:3.5 scale model of a two-span transversely and longitudinally post-tensioned continuous double-tee bridge system, representing a target bridge of 70 ft. span. Theoretical analysis was carried out for comparison using different modelling techniques, such as isotropic and orthotropic material behavior, and the load distribution theory. Behavior of the bridge system was evaluated in terms of deflections, wheel load distributions, crack patterns and growth with...
Show moreThis dissertation is a study of 1:3.5 scale model of a two-span transversely and longitudinally post-tensioned continuous double-tee bridge system, representing a target bridge of 70 ft. span. Theoretical analysis was carried out for comparison using different modelling techniques, such as isotropic and orthotropic material behavior, and the load distribution theory. Behavior of the bridge system was evaluated in terms of deflections, wheel load distributions, crack patterns and growth with increasing number of cycles of fatigue loading. The precast model beams were assembled and tested at the Department of Ocean Engineering, Florida Atlantic University. AASHTO HS20-44 truck loading was simulated by applying constant amplitude fatigue loading at typical locations. The study established the feasibility and structural adequacy of the precast prestressed concrete double-tee concept for short and medium span interstate highway bridges for use in Florida and elsewhere.
Show less
Date Issued: 1989
PURL: http://purl.flvc.org/fcla/dt/14513
Subject Headings: Prestressed concrete beams--Fatigue, Bridges, Concrete--Joints
Format: Document (PDF)

FAU Theses and Dissertations (1931)	+ -
FAU College Collections (30)	+ -
FAU Undergraduate Student Research (11)	+ -
Southeast National Marine Renewable Energy Center (1)	+ -

Wireless communication systems (70)	+ -
Neural networks (Computer science) (63)	+ -
Mathematical models (55)	+ -
Fluid dynamics (46)	+ -
Computer network protocols (45)	+ -

Underwater acoustics (44)	+ -
Machine learning (42)	+ -
Computer software--Quality control (40)	+ -
Technological innovations (33)	+ -
Computer algorithms (31)	+ -
Computer networks (31)	+ -
Design and construction (31)	+ -
Software engineering (29)	+ -
Structural dynamics (29)	+ -
Algorithms (28)	+ -
Finite element method (27)	+ -
Fault-tolerant computing (26)	+ -
Florida Atlantic University -- History (26)	+ -
Software measurement (26)	+ -
Testing (26)	+ -
Computer architecture (25)	+ -
Mobile communication systems (25)	+ -
Mobile computing (25)	+ -
Pattern recognition systems (25)	+ -
Signal processing (25)	+ -
Composite materials (24)	+ -
Artificial intelligence (23)	+ -
Expert systems (Computer science) (23)	+ -
Computer network architectures (22)	+ -
Fracture mechanics (22)	+ -

United States (14)	+ -
Florida (8)	+ -
Boynton Inlet (1)	+ -
Florida, Straits of (1)	+ -
Gulf Stream (1)	+ -

Longboat Key (1)	+ -
Palm Beach County (1)	+ -
Pembroke Pines (1)	+ -
Planning (1)	+ -
South Florida Water Management District (1)	+ -

Search In

Pages

Pages

Sort Results By:

Narrow results by:

Collection

Topical Subject

Geographic Subject

Genre Subject

Title as Subject

Genre

Type of Resource

Language

Creator

Format

Owner