Current Search: Simulation methods (x)
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Pages
- Title
- Molecular dynamics simulation of single-walled carbon nanotubes.
- Creator
- Cornwell, Charles F., Florida Atlantic University, Wille, Luc T.
- Abstract/Description
-
Classical trajectory molecular dynamics methods are used to investigate open ended free standing single wall carbon nanotubes ("SWT"). Total energy calculations performed using classical three-body interatomic potentials with periodic boundary conditions along the tube axis, showed that the minimum strain energy varied as 1/$R\sp2$ relative to an unstrained graphite sheet. We discuss the development of a parallel code to simulate short-ranged empirical potentials such as those of Stillinger...
Show moreClassical trajectory molecular dynamics methods are used to investigate open ended free standing single wall carbon nanotubes ("SWT"). Total energy calculations performed using classical three-body interatomic potentials with periodic boundary conditions along the tube axis, showed that the minimum strain energy varied as 1/$R\sp2$ relative to an unstrained graphite sheet. We discuss the development of a parallel code to simulate short-ranged empirical potentials such as those of Stillinger and Weber, Tersoff, and Tersoff-Brenner. We then use the Tersoff and Tersoff-Brenner potentials to examine SWT and the tube response to axial stretching and compression. Data collected are used to calculate Young's modulus for the tubes and to develop a simple formula that approximates Young's modulus over a range of tube radii. The investigation of the free standing SWT leads to a suggestion for the possible mechanism responsible for holding the tubes open during the growth process.
Show less - Date Issued
- 1996
- PURL
- http://purl.flvc.org/fcla/dt/15269
- Subject Headings
- Carbon, Nanostructured materials, Simulation methods
- 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
- Visual discrimination by C57BL/6J mice in water maze tasks: does size really matter?.
- Creator
- Buerger, Eric D., Charles E. Schmidt College of Science, Department of Psychology
- Abstract/Description
-
When interpreting how an animal "learns" discrimination tasks, strain capabilities must be considered, and it should be shown that they comprehend the task in a manner consistent with the given interpretation. A novel visual-discrimination (VD) task for relative-size-relations was used to examine visual cue use in C57BL/6J mice, which are shown to have biologically good vision and neurologically intact memory for VD tasks. Results suggest C57BL/6J strain may not be fully capable of relative...
Show moreWhen interpreting how an animal "learns" discrimination tasks, strain capabilities must be considered, and it should be shown that they comprehend the task in a manner consistent with the given interpretation. A novel visual-discrimination (VD) task for relative-size-relations was used to examine visual cue use in C57BL/6J mice, which are shown to have biologically good vision and neurologically intact memory for VD tasks. Results suggest C57BL/6J strain may not be fully capable of relative cue-size associations or even object recognition-based on a water maze VD task. This is in contrast to previous studies suggesting this mice strain is quite strong in visual skills and on VD tasks. Additionally, cue size and/or cue-pairings do appear to influence specific directional preferences or stereotyped behaviors as trainings continued, and these strategies shifted during novel probes. Future studies should assess how mice discriminate between objects and test rat's capabilities on this task.
Show less - Date Issued
- 2008
- PURL
- http://purl.flvc.org/FAU/165670
- Subject Headings
- Visual discrimination, Form perception, Animal behavior, Simulation methods, Animals, Adaptation, Simulation methods
- Format
- Document (PDF)
- Title
- Micro-model for paper.
- Creator
- Lu, Wentao, Florida Atlantic University, Carlsson, Leif A., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
An aggregate (mosaic) model is proposed to represent the structure of paper and model the mechanical properties. The model treats paper as an aggregate of three subregions of characteristic materials, viz. bonded regions, unbonded regions (free fiber segments) and voids. A computer simulation based on the Monte Carlo method is performed to generate random and oriented paper sheets and input parameters for the aggregate model. The number of fiber crossings, total bonded area, average free...
Show moreAn aggregate (mosaic) model is proposed to represent the structure of paper and model the mechanical properties. The model treats paper as an aggregate of three subregions of characteristic materials, viz. bonded regions, unbonded regions (free fiber segments) and voids. A computer simulation based on the Monte Carlo method is performed to generate random and oriented paper sheets and input parameters for the aggregate model. The number of fiber crossings, total bonded area, average free fiber segment length and volume fractions of bonded material and free fiber segments and apparent sheet density are obtained from the statistical geometry description of the paper structure. The upper and lower bounds on the elastic moduli and moisture swelling coefficients of void-free paper are derived based on anisotropic elasticity theory and a fiber orientation distribution parameter. The finite element method is applied to generate effective elastic moduli and moisture swelling coefficients of the aggregate model consisting of fiber crossings and segments, but no voids. The elastic moduli of paper so obtained are corrected for the voids present in paper. The predictions are compared with previously published experimental results, and it is demonstrated that the results generally fall within the theoretical bounds. The mosaic model was shown to approximate the mechanical properties of paper.
Show less - Date Issued
- 1994
- PURL
- http://purl.flvc.org/fcla/dt/15064
- Subject Headings
- Paper, Papermaking, Monte Carlo method--Computer simulation
- Format
- Document (PDF)
- Title
- Sensitivity analysis for machine cell formation using mathematical model and computer simulation.
- Creator
- Yelamanchi, Ravi., Florida Atlantic University, Han, Chingping (Jim), College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
This thesis presents a mathematical model for the sensitivity analysis of machine cell formation. Computer programs in C were developed. A statistical simulation model is developed to test and verify the mathematical model. The data for machine cell formation in cellular manufacturing is organized in a machine component chart representing the machining requirements of parts in the product mix. The existing machine cell formation models treat the product mix as deterministic. To study the...
Show moreThis thesis presents a mathematical model for the sensitivity analysis of machine cell formation. Computer programs in C were developed. A statistical simulation model is developed to test and verify the mathematical model. The data for machine cell formation in cellular manufacturing is organized in a machine component chart representing the machining requirements of parts in the product mix. The existing machine cell formation models treat the product mix as deterministic. To study the probabilistic nature of the cellular manufacturing, a sensitivity analysis model is presented. The model optimizes the formation of intercellular material handling cost for the machine cell within the constrains of the probability of the product mixture. The results of the mathematical model is compared with the results of the simulation model. It shows that the probabilistic product mix has a influence on the efficiency of the machine cell and the associated total cost.
Show less - Date Issued
- 1992
- PURL
- http://purl.flvc.org/fcla/dt/14848
- Subject Headings
- Group technology--Simulation methods, Manufacturing processes--Data processing
- Format
- Document (PDF)
- Title
- SIMULATION STUDY OF FLOW-CONTROL IN A TOKEN-RING LOCAL AREA NETWORK.
- Creator
- BALACHANDRAN, CHITRA., Florida Atlantic University, Ilyas, Mohammad
- Abstract/Description
-
This thesis deals with simulation of flow control in token-ring local area networks. The primary emphasis of this simulation study is to observe the effects of token holding time on the performance of the network. Token holding time is adjusted to account for two types of service disciplines: gated and limited. Network performance for these two service disciplines is compared to determine which one of the two gives a relatively better performance. Besides throughput and delay, a more compact...
Show moreThis thesis deals with simulation of flow control in token-ring local area networks. The primary emphasis of this simulation study is to observe the effects of token holding time on the performance of the network. Token holding time is adjusted to account for two types of service disciplines: gated and limited. Network performance for these two service disciplines is compared to determine which one of the two gives a relatively better performance. Besides throughput and delay, a more compact form of performance measure called "power", has also been used in the study . Power is simply a ratio of throughput and delay . This study has shown that the token holding time has a significant effect on the performance of a local area network . Simulation results of this study are presented in terms of throughput, delay, power, token circulation time and efficiency/overhead versus offered load. The results are presented in the form of graphs.
Show less - Date Issued
- 1986
- PURL
- http://purl.flvc.org/fcla/dt/14311
- Subject Headings
- Local area networks (Computer networks)--Simulation methods
- Format
- Document (PDF)
- Title
- NON-RADIOACTIVE ELEMENTS FOR PROMPT GAMMA ENHANCEMENT IN PROTON THERAPY.
- Creator
- Galanakou, Panagiota, Muhammad, Wazir, Florida Atlantic University, Department of Physics, Charles E. Schmidt College of Science
- Abstract/Description
-
Intensity modulated proton beam scanning therapy allows for highly conformal dose distribution and better sparing of organ-at-risk compared to conventional photon radiotherapy, thanks to the characteristic dose deposition at depth, the Bragg Peak (BP), of protons as a function of depth and energy. However, proton range uncertainties lead to extended clinical margins, at the expense of treatment quality. Prompt Gamma (PG) rays emitted during non- elastic interactions of proton with the matter...
Show moreIntensity modulated proton beam scanning therapy allows for highly conformal dose distribution and better sparing of organ-at-risk compared to conventional photon radiotherapy, thanks to the characteristic dose deposition at depth, the Bragg Peak (BP), of protons as a function of depth and energy. However, proton range uncertainties lead to extended clinical margins, at the expense of treatment quality. Prompt Gamma (PG) rays emitted during non- elastic interactions of proton with the matter have been proposed for in-vivo proton range tracking. Nevertheless, poor PG statistics downgrade the potential of the clinical implementation of the proposed techniques. We study the insertion of the nonradioactive elements 19F, 17O, 127I in a tumor area to enhance the PG production of 4.44 MeV (P1) and 6.15 MeV (P2) PG rays emitted during proton irradiation, both correlated with the distal fall-off of the BP. We developed a novel Monte Carlo (MC) model using the TOPAS MC package. With this model, we simulated incident proton beams with energies of 75 MeV, 100 MeV and 200 MeV in co-centric cylindrical phantoms. The outer cylinder (scorer) was filled with water and the inner cylinder (simulating a tumor region inside water-equivalent body) was filled with water containing 0.1%–20% weight fractions of each of the tested elements.
Show less - Date Issued
- 2023
- PURL
- http://purl.flvc.org/fau/fd/FA00014222
- Subject Headings
- Proton Therapy, Monte Carlo method--Simulation, Gamma rays
- Format
- Document (PDF)
- Title
- THE USE OF COMPUTER SIMULATION TECHNIQUES IN THE DESIGN OF SHIP CHANNEL WIDTH (PORT, HARBOR, TAMPA).
- Creator
- THOMAS, CLINTON WILLIAM., Florida Atlantic University, Lin, Newman K., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
This report presents a detailed approach to the problem of determining expected shipping delays that are caused by inadequate channel width. Data collection and analysis is accomplished for the shipping industry of Tampa Bay, Florida. Historical data and cargo projection are used to develop the expected shipping traffic density and distribution for the year 2000. An overview of a computer model that simulates the shipping traffic and accounts for delays due to channel width is presented. A...
Show moreThis report presents a detailed approach to the problem of determining expected shipping delays that are caused by inadequate channel width. Data collection and analysis is accomplished for the shipping industry of Tampa Bay, Florida. Historical data and cargo projection are used to develop the expected shipping traffic density and distribution for the year 2000. An overview of a computer model that simulates the shipping traffic and accounts for delays due to channel width is presented. A sensitivity analysis performed on the model to determine the effect each input variable has on shipping delays. The results are presented in the form of shipping delay curves for seven types of vessels over a range of channel widths.
Show less - Date Issued
- 1986
- PURL
- http://purl.flvc.org/fcla/dt/14287
- Subject Headings
- Shipping--Simulation methods, Channels (Hydraulic engineering)--Design and construction--Simulation methods, Shipping--Florida--Tampa Bay
- Format
- Document (PDF)
- Title
- A graphical Windows(c)-based cable and underwater system simulation software.
- Creator
- de Baudreuil, Jean., Florida Atlantic University, Driscoll, Frederick R.
- Abstract/Description
-
Underwater systems behavior prediction has become an important success factor in the design and implementation of marine systems. Most marine systems involve cables for mooring, deployment, recovery, or towing; however, estimating the response of these systems is difficult because of their non-linear behavior. Thus, numerical models are used to simulate submerged cabled systems. At FAU, many mission specific cable simulations have been developed, but no single, all encompassing software...
Show moreUnderwater systems behavior prediction has become an important success factor in the design and implementation of marine systems. Most marine systems involve cables for mooring, deployment, recovery, or towing; however, estimating the response of these systems is difficult because of their non-linear behavior. Thus, numerical models are used to simulate submerged cabled systems. At FAU, many mission specific cable simulations have been developed, but no single, all encompassing software package exists. This thesis develops a Windows(c) based software package to quickly and easily create FEA models of underwater cabled systems and simulate their response. The model is based on a discrete finite element analysis using linear elements. The software provides fully integrated and interactive Graphical User Interfaces with a 3-dimensional graphical display of the model, and integrates adapted data analysis and visualization tools. The software provides an easy and efficient way to simulate an underwater system involving cables.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13232
- Subject Headings
- Oceanographic submersibles--Computer simulation, Computer software--Development, Simulation methods, Cables, Submarine
- Format
- Document (PDF)
- Title
- Software development of a hardware-in-the-loop simulation and a three-dimensional viewer for autonomous underwater vehicles.
- Creator
- Mahieu, Frederi., Florida Atlantic University, An, Edgar, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
This thesis describes the development of the hardware-in-the-loop simulation for FAU Autonomous Underwater Vehicles. The development was based on the existing simulation platform. For more efficiency and flexibility, this simulation package was ported to Linux. The hardware-in-the-loop simulation enables developers to connect the vehicle directly to a remote simulator. This kind of simulation is used to test the actual software components embedded in the vehicle system. The simulation package...
Show moreThis thesis describes the development of the hardware-in-the-loop simulation for FAU Autonomous Underwater Vehicles. The development was based on the existing simulation platform. For more efficiency and flexibility, this simulation package was ported to Linux. The hardware-in-the-loop simulation enables developers to connect the vehicle directly to a remote simulator. This kind of simulation is used to test the actual software components embedded in the vehicle system. The simulation package was enhanced by the addition of a 3D viewer. This thesis describes the whole development process, from feasibility study and implementation to qualification phases. This viewer is platform independent and designed to be connected to the simulator. It renders the AUV moving in a virtual environment. This tool can be used during all development steps, from tuning phases to post-mission analysis.
Show less - Date Issued
- 2000
- PURL
- http://purl.flvc.org/fcla/dt/15778
- Subject Headings
- Oceanographic submersibles--Computer simulation, Computer software--Development, Simulation methods, Three-dimensional display systems
- Format
- Document (PDF)
- Title
- Integrating simulation into advanced practice education: weighing costs and benefits.
- Creator
- Weiss, Josie A.
- PURL
- http://purl.flvc.org/fcla/dt/3183265
- Subject Headings
- Advanced Nursing Practice, Advanced Nursing Practice --Education, Education, Nursing, Patient Safety --Education, Patient Simulation, Simulations, Teaching Methods
- Format
- Document (PDF)
- Title
- Integrated simulator of JIT manufacturing process.
- Creator
- Li, Shuanghu., Florida Atlantic University, Mazouz, Abdel Kader, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
The main objective of this research is to develop an integrated simulator which would perform as a decision support system of a Just-in-Time manufacturing process. It would permit a process designer or manufacturing engineer with no simulation expertise to define the process variables, then run the simulation program. A secondary objective is to combine in one system the key functions required by a manufacturing engineer or manager, such as the operational (real time), statistical, and...
Show moreThe main objective of this research is to develop an integrated simulator which would perform as a decision support system of a Just-in-Time manufacturing process. It would permit a process designer or manufacturing engineer with no simulation expertise to define the process variables, then run the simulation program. A secondary objective is to combine in one system the key functions required by a manufacturing engineer or manager, such as the operational (real time), statistical, and financial aspects. And also makes those function modules easy to understand and user-friendly. The integrated simulator can use animation to visualize an actual production line. A case study has been developed to verify and validate the work done.
Show less - Date Issued
- 1992
- PURL
- http://purl.flvc.org/fcla/dt/14800
- Subject Headings
- Just-in-time systems--Computer simulation, Manufacturing processes--Automation, Simulation methods--Computer programs
- Format
- Document (PDF)
- Title
- Investigation of marine waterjet inlets during turning maneuvers.
- Creator
- Duerr, Phillip S., von Ellenrieder, Karl, Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
Numerical simulations of waterjet inlets have been conducted in order to understand inlet performance during ship turning maneuvers. During turning maneuvers waterjet systems may experience low efficiency, cavitation, vibration, and noise. This study found that during turns less energy arrived at the waterjet pump relative to operating straight ahead, and that the flow field at the entrance of the waterjet pump exhibited a region of both low pressure and low axial velocity. The primary reason...
Show moreNumerical simulations of waterjet inlets have been conducted in order to understand inlet performance during ship turning maneuvers. During turning maneuvers waterjet systems may experience low efficiency, cavitation, vibration, and noise. This study found that during turns less energy arrived at the waterjet pump relative to operating straight ahead, and that the flow field at the entrance of the waterjet pump exhibited a region of both low pressure and low axial velocity. The primary reason for the change in pump inflow uniformity is due to a streamwise vortex. In oblique inflow the hull boundary layer separates when entering the inlet and wraps up forming the streamwise vortex. These changes in pump inflow during turning maneuvers will result in increased unsteady loading of the pump rotor and early onset of pump rotor cavitation.
Show less - Date Issued
- 2015
- PURL
- http://purl.flvc.org/fau/fd/FA00004364, http://purl.flvc.org/fau/fd/FA00004364
- Subject Headings
- Fluid dynamics, Ships--Hydrodynamics, Ships--Maneuverability--Simulation methods, Ship handling--Simulation methods, Ship propulsion, Stability of ships, Oceanographic instruments--Evaluation
- Format
- Document (PDF)
- Title
- Simulation and modeling of flow field around a horizontal axis wind turbine (HAWT) using RANS method.
- Creator
- Sargsyan, Armen., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
The principal objective of the proposed CFD analysis is to investigate the flow field around a horizontal axis wind turbine rotor and calculate the turbine's power. A full three dimensional computational fluid dynamics method based on Reynolds Averaged Navier Stokes approach was used in this study. The wind turbine has three blades and a rotor diameter of six meters. One third of the wind turbine rotor was modeled by means of 120o periodicity in a moving reference frame system. The power...
Show moreThe principal objective of the proposed CFD analysis is to investigate the flow field around a horizontal axis wind turbine rotor and calculate the turbine's power. A full three dimensional computational fluid dynamics method based on Reynolds Averaged Navier Stokes approach was used in this study. The wind turbine has three blades and a rotor diameter of six meters. One third of the wind turbine rotor was modeled by means of 120o periodicity in a moving reference frame system. The power coefficient curve obtained from the CFD results is compared with experimental data obtained by NREL Phase VI rotor experiment. The numerical result for the power coefficient curve shows close agreement with the experimental data. The simulation results include the velocity distribution, pressure distribution along the flow direction, turbulent wake behind the wind turbine, and the turbine's power. The discussion will also include the effect of wind speed on turbine's power.
Show less - Date Issued
- 2010
- PURL
- http://purl.flvc.org/FAU/2979383
- Subject Headings
- Wind turbines, Aerodynamics, Computer simulation, Fluid dynamics, Computational methods, Vibration (Aerodynamics)
- Format
- Document (PDF)
- Title
- Stability analysis for nonlinear systems with time-delays.
- Creator
- Tiwari, Shanaz, Charles E. Schmidt College of Science, Department of Mathematical Sciences
- Abstract/Description
-
In this work, we investigate input-to-state stability (ISS) and other related stability properties for control systems with time-delays. To overcome the complexity caused by the presence of the delays, we adopt a Razumikhin approach. The underlying idea of this approach is to treat the delayed variables as system uncertainties. The advantage of this approach is that one works in the more familiar territory of stability analysis for delay-free systems in the context of ISS instead of carrying...
Show moreIn this work, we investigate input-to-state stability (ISS) and other related stability properties for control systems with time-delays. To overcome the complexity caused by the presence of the delays, we adopt a Razumikhin approach. The underlying idea of this approach is to treat the delayed variables as system uncertainties. The advantage of this approach is that one works in the more familiar territory of stability analysis for delay-free systems in the context of ISS instead of carrying out stability analysis on systems of functional differential equations. Our first step is to provide criteria on ISS and input-to-input stability properties based on the Razumikhin approach. We then turn our attention to large-scale interconnected systems. It has been well recognized that the small-gain theory is a powerful tool for stability analysis of interconnected systems. Using the Razumikhin approach, we develop small-gain theorems for interconnected systems consisting of two or more subs ystems with time-delays present either in the interconnection channels or within the subsystems themselves. As an interesting application, we apply our results to an existing model for hematopoesis, a blood cell production process,and improve the previous results derived by linear methods. Another important stability notion in the framework of ISS is the integral ISS (iISS) property. This is a weaker property than ISS, so it supplies to a larger class of systems. As in the case of ISS, we provide Razumikhin criteria on iISS for systems with delays. An example is presented to illustrate that though very useful in practice, the Razumikhin approach only provides sufficient conditions, not equivalent conditions. Finally, we address stability of time-varying systems with delays in the framework of ISS., In particular, we consider Lyapunov-Razumikhin functions whose decay rates are affected by time-varying functions that can be zero or even negative on some sets of non-zero measure. Our motivation is that it is often less demanding to find or construct such a Lyapunov function than one with a uniform decay rate. We also extend our small-gain theorems to the time-varying case by treating the time-varying system as an auxiliary time-invariant system.
Show less - Date Issued
- 2012
- PURL
- http://purl.flvc.org/FAU/3352880
- Subject Headings
- Nonlinear systems, Simulation methods, Control theory, Stability, Mathematical models, Mathematical optimization
- Format
- Document (PDF)
- Title
- Warehousing simulator design.
- Creator
- Aziz, Nibal Tawfiq., Florida Atlantic University, Mazouz, Abdel Kader
- Abstract/Description
-
Warehousing System is a complex problem, requiring simultaneous consideration of a large number of intricately related issues. In this research author focuses on the computerization opportunities that are unique in maintaining smooth storage and retrieval operations and recouping a controlled inventory status of a warehouse system. The main objective in this research is to define how layout decisions can both depend on warehouse's operations and effect inventory control decisions of a...
Show moreWarehousing System is a complex problem, requiring simultaneous consideration of a large number of intricately related issues. In this research author focuses on the computerization opportunities that are unique in maintaining smooth storage and retrieval operations and recouping a controlled inventory status of a warehouse system. The main objective in this research is to define how layout decisions can both depend on warehouse's operations and effect inventory control decisions of a warehouse system. Author had defined, designed and implemented a simulated warehousing system using SIMAN. In particular, author uses simulation modeling as an approach to analyze layout design and operations of a warehouse system. Also, author had developed a database management systems software application using dBase IV. This relational database is used to dynamically forecast inventory level. A case study is used as a test bed to verify and validate the work done.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/15152
- Subject Headings
- Warehouses--Designs and plans, Inventory control, Physical distribution of goods, Materials handling, Simulation methods
- Format
- Document (PDF)
- Title
- Simulation, control and optimization of underwater vehicle performance.
- Creator
- Zipf, David Glenn., Florida Atlantic University, Dunn, Stanley E., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
This project addresses the simulation, control and optimization of underwater vehicle performance. An analytical model of underwater vehicle motion has been developed. This model is based on a set of six degree of freedom nonlinear differential equations of motion. These equations incorporate inertial, hydrodynamic, hydrostatic, gravity and thruster forces to define the vehicle's motion. The forces are calculated and the equations of motion solved using a finite difference method of...
Show moreThis project addresses the simulation, control and optimization of underwater vehicle performance. An analytical model of underwater vehicle motion has been developed. This model is based on a set of six degree of freedom nonlinear differential equations of motion. These equations incorporate inertial, hydrodynamic, hydrostatic, gravity and thruster forces to define the vehicle's motion. The forces are calculated and the equations of motion solved using a finite difference method of integration. An automatic closed loop control strategy has been developed and integrated into the motion model. The controller determines control plane deflection and thruster output based on sensor provided input, maneuver request and control gain constants. The motion model simulates the effects of these controller requests on the vehicle motion. The controller effects are analyzed and an optimal set of control gains is determined. These optimal gains are determined based on a quantitative comparison of a pre-defined Performance Index (PI) function. The PI is a function of critical performance values, i.e., energy consumption, and user defined weighted constants. By employing an iteration technique the PI is minimized to provide an optimal set of control gains.
Show less - Date Issued
- 1989
- PURL
- http://purl.flvc.org/fcla/dt/14534
- Subject Headings
- Oceanographic submersibles--Automatic control, Oceanographic submersibles--Simulation methods, Vehicles, Remotely piloted
- Format
- Document (PDF)
- Title
- Simulation modeling for hospital emergency department resource analysis.
- Creator
- Amodie, Jeffrey Scott., Florida Atlantic University, Han, Chingping (Jim)
- Abstract/Description
-
Hospital Emergency Departments are forced to operate under many unknown conditions. Therefore, determining the appropriate staffing requirements of an emergency department can be a difficult task. The objective herein is to develop a procedure for assembling a simulation model, to be used as a tool for determining adequate resource requirements for various situations encountered in an emergency department of a hospital. The model will consider variables such as patient arrival rates, types of...
Show moreHospital Emergency Departments are forced to operate under many unknown conditions. Therefore, determining the appropriate staffing requirements of an emergency department can be a difficult task. The objective herein is to develop a procedure for assembling a simulation model, to be used as a tool for determining adequate resource requirements for various situations encountered in an emergency department of a hospital. The model will consider variables such as patient arrival rates, types of injuries, duration of treatment for each specific injury, available resources, etc. It is expected that the use of such a model will help emergency department managers plan for adequate resources to meet the needs of the community being served.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/15216
- Subject Headings
- Hospitals--Emergency service, Hospitals--Emergency service--Utilization--Simulation methods, Hospitals--Staff
- Format
- Document (PDF)
- Title
- Statistical modeling of the container inventory control in a distribution network.
- Creator
- Feng, Weiming., Florida Atlantic University, Han, Chingping (Jim), College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
The study of the reusable container inventory control in a distribution network is crucial to the efficiency and cost effectiveness of the transportation systems. In order to minimize the total operation cost of such a transportation network system, all subsystems of the distribution network have to be optimized together as a whole system. In this study, we extended the inventory control concept and developed a multiple-inventory control model for the transportation network. We presented a...
Show moreThe study of the reusable container inventory control in a distribution network is crucial to the efficiency and cost effectiveness of the transportation systems. In order to minimize the total operation cost of such a transportation network system, all subsystems of the distribution network have to be optimized together as a whole system. In this study, we extended the inventory control concept and developed a multiple-inventory control model for the transportation network. We presented a systematic approach to address all those subsystems as interrelated systems. Mathematical models were developed for the transportation and container inventory control problems first. Then, the statistical modeling method was used to analyze the effects of the container inventory management policies on the performance of the transportation system. Based on the optimization theory, simulation executions were such arranged to lead to the globe optimality. This makes it possible to optimize the variables of inventory control under different control policies without solving mathematical models. A Simulation Code Generator (SCG) was also developed for a general container inventory control system.
Show less - Date Issued
- 1997
- PURL
- http://purl.flvc.org/fcla/dt/12525
- Subject Headings
- Inventory control--Mathematical models, Containerization, Transportation--Mathematical models, Inventory control--Simulation methods
- Format
- Document (PDF)
- Title
- Numerical Simulation and Performance Characterization of Two Wave Energy Converters.
- Creator
- DePietro, Abigail R., VanZwieten, James, Florida Atlantic University, Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science
- Abstract/Description
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This research consists of the numerical model development and simulation of two prototype Wave Energy Convertor designs (WECs) across three simulation types. The first design is an oscillating body WEC called the Platypus designed to capture wave energy as three paddle arms actuate over the surface of the waves. The second design is an overtopping type WEC called the ROOWaC which captures and drains entrained water to generate power. Modeling of these systems was conducted using two...
Show moreThis research consists of the numerical model development and simulation of two prototype Wave Energy Convertor designs (WECs) across three simulation types. The first design is an oscillating body WEC called the Platypus designed to capture wave energy as three paddle arms actuate over the surface of the waves. The second design is an overtopping type WEC called the ROOWaC which captures and drains entrained water to generate power. Modeling of these systems was conducted using two techniques: the Morison load approach implemented using hydrodynamic response coefficients used to model the Platypus and a boundary element method (BEM) frequency-domain approach to model both WEC designs in the time domain. The BEM models included the development of hydrodynamic response coefficients using a discretized panel mesh of the system for calculation of added mass, excitation, and radiation forces. These three model families provided both performance predictions and power output information to WEC developers that supply important data for future full-scale designs. These models were used to predict power generation estimates for both WECs as follows: the Platypus WEC was predicted to have a maximum efficiency range between 14.5-35% and the ROOWaC WEC was predicted to generate a maximum peak average power of 19 W upon preliminary results.
Show less - Date Issued
- 2022
- PURL
- http://purl.flvc.org/fau/fd/FA00013956
- Subject Headings
- Ocean energy resources--Research, Ocean wave power, Simulations, Mathematical methods and modelling
- Format
- Document (PDF)
