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Articles 1 - 30 of 78
Full-Text Articles in Engineering
Discrete Event Simulation And Cost Model For Optimization Of Manufacturing Resource Usages Associated With Implementation Of A Redesigned Product, Alexander Eierle
Discrete Event Simulation And Cost Model For Optimization Of Manufacturing Resource Usages Associated With Implementation Of A Redesigned Product, Alexander Eierle
Theses and Dissertations
This paper demonstrates an approach to evaluating production factors related to schedule and resources based on changes to the production process. A discrete event simulation model was developed to evaluate different production factors, such as arrival times, number of entities, resource availabilities, and work in process (WIP) times, compared to the total yield at a production facility. This model helped to develop relationships between the required asset resource usages and the overall production resource allocation with the related effects to process wait times and production outputs. A comparative analysis with cost was performed to determine the effect that varied resources …
Finite Element Analysis Of Humerus With Impact At Distal End And The Mechanical Effect Of Bone Rehydration, Amy Gutierrez
Finite Element Analysis Of Humerus With Impact At Distal End And The Mechanical Effect Of Bone Rehydration, Amy Gutierrez
Theses and Dissertations
Numerical modeling accuracy is dependent upon correct material property determination and input. This thesis demonstrates the importance in both numerical modeling and material characterization, two aspects of biomedical research that are intimately linked. The first study investigates the shear forces experienced on the humerus from a humeral impact on the distal end using 3D CAD model of a humerus and ANSYS for a finite element analysis. The humeral bone was analyzed with an impact on the distal end to signify falling on the elbow. A humeral model and a humeral model with a plate were both statically and dynamically simulated …
Mindful: A Novel Virtual System Migration Decision-Making Framework For Automated Cyber-Resiliency, Nicholas James Lowing
Mindful: A Novel Virtual System Migration Decision-Making Framework For Automated Cyber-Resiliency, Nicholas James Lowing
Theses and Dissertations
Virtual system migration has revolutionized modern computing. As an advantageous byproduct of virtualization, virtual system migration has allowed for cheaper, more robust cloud management. The selection of a destination host during migration is a key component of migration management. However, there is currently no state-of-the-art, standardized framework for making this decision. Previous work related to automated load balancing is plentiful, but when load balancing is not the primary focus of the cloud management strategy there is a lack of research. We focus on this case, where virtual systems are no longer moved based on some predefined optimization pattern, but rather …
Free Response And Trim Force Requirements For Aircraft Configuration Changes, Marvin Toepfer
Free Response And Trim Force Requirements For Aircraft Configuration Changes, Marvin Toepfer
Theses and Dissertations
As an FAA Commercial Pilot and Flight Instructor, one comes in contact with many different types of experiences and abnormal situations. A widely known cause of fatal accidents in the general aviation industry, and also currently listed on the National Transportation Safety Board Most Wanted List, is the loss of control in the traffic pattern [1]. For many years now, different departments of the FAA and Department of Transportation, such as the FAA Small Airplane Directorate, have been trying to mitigate the risks and causes associated with the loss of control in the traffic pattern. Due to technological advancements and …
Evaluation Of Bond Properties Between Fiber Reinforced Concrete Overlay And Substrate Concrete, Emad Okrush Alshammari
Evaluation Of Bond Properties Between Fiber Reinforced Concrete Overlay And Substrate Concrete, Emad Okrush Alshammari
Theses and Dissertations
Bonded concrete overlay is the most economical and quick option in concrete rehabilitation methods to provide strength for the existing structure. Bonded concrete overlay strength rely on properties of both layers (substrate and new layers). Poor bonding in interface zone leads to two main failures of concrete overlays; debonding and cracks. There are several traditional factors affect bond strength such as water to cement (w/c) ratio, moisture condition, and surface roughness for substrate layer. However, the effect of using fiber consider a new variable affecting bond strength. Fiber reinforced concrete (FRC) is one type of overlay system which has been …
Vision-Based Navigation For Electromagnetic Formation Flight, Nasir Ghazi Hariri
Vision-Based Navigation For Electromagnetic Formation Flight, Nasir Ghazi Hariri
Theses and Dissertations
The concept of using Satellite Formation Flight (SFF) reveals various benefits for a space mission. However, relying on a consumable actuation system to maintain a desired relative position and orientation between flying satellites has hindered its practicality and feasibility for long duration missions. By adapting the SFF concept such that electromagnetic actuation mechanism is employed, the concept of Electromagnetic Formation Flight (EMFF) offers a great potential to validate such a technology. EMFF provides interacting forces and torques between flying satellites to maintain their relative position within a formation using its electromagnetic actuation capabilities. This dissertation demonstrates the possibilities of utilizing …
Phonon Polariton Enhanced Infrared Waveguides, Yuchen Yang
Phonon Polariton Enhanced Infrared Waveguides, Yuchen Yang
Theses and Dissertations
The need for robust, reliable and sensitive terahertz (THz) sources and detectors has motivated the research into waveguiding structures. The increasing adoption of micro- and nanofabricated optical components addresses the critical challenge of guiding light with subwavelength confinement. Surface plasmon polariton (SPP) waveguides are among the most promising candidates for manipulating light on subwavelength scales and harbor many potential applications at visible and nearinfrared (NIR) wavelengths. However, the metal in the waveguide yields very weak or nonexistent response in the mid and long wave infrared range, since metal in this region is very lossy and has large magnitude real and …
Aerodynamic Model Of The Piper Warrior Ii Based On Flight Test Data, Nicholas Casciola
Aerodynamic Model Of The Piper Warrior Ii Based On Flight Test Data, Nicholas Casciola
Theses and Dissertations
Aerodynamic modeling is an important part of aircraft design and of aircraft testing. Generally, this is done through CFD models and Wind Tunnel tests prior to the aircrafts first flight but building the models using flight test data is also very important. It is used to verify theoretical models generated from the computer and wind tunnel tests. They are also useful for building simulators, particularly those in modeling and analyzing airport traffic patterns. These tests used a Piper Pa-28-161 Warrior II owned by the Florida Tech Flight Test Engineering program. It has a 160hp Lycoming engine. The test pilot was …
Quantitative Measurement Techniques For Vibration And Buffet, Edward Thomas Meyer
Quantitative Measurement Techniques For Vibration And Buffet, Edward Thomas Meyer
Theses and Dissertations
This paper outlines a proposed parameter for measurement of vibration and buffet in vehicles. It is intended to be used where applicable in lieu of raw accelerometer data or qualitative comments to measure ride quality, quantify vibration levels, and aid in certification matters. In flight vehicle applications which employ fly-by wire flight control systems with closed loop and variable gain control laws, the phenomenon of buffet in its various forms is becoming somewhat specious as an aircrew cue in relation to the stability and control of flight vehicles. In these applications, stability and control throughout the operating envelope is designed …
Development Of Adaptable Human-Machine Interface For Teleoperation Over Time Delay, May Nyein Chan
Development Of Adaptable Human-Machine Interface For Teleoperation Over Time Delay, May Nyein Chan
Theses and Dissertations
The Adaptable Human-Machine Interface (AHMI) was developed for the Orbital Robotic Interaction, On-orbit servicing, and Navigation (ORION) Laboratory of the Florida Institute of Technology. The primary project objective was to develop and test a predictive display for mitigating the effects of time delay in teleoperation of space robots and Unmanned Aerial Vehicles (UAV) using quadcopters as a test case. Regardless of the increasing popularity of various autonomous systems, research and development of teleoperating system should not be neglected since it is often utilized as a back-up in most autonomous systems especially in systems for human spaceflight and UAV operations in …
Effect Of Film Cooling Hole Size On A Turbine Rotor Blade, Klint Martis
Effect Of Film Cooling Hole Size On A Turbine Rotor Blade, Klint Martis
Theses and Dissertations
The objective of this study was to evaluate the effect of the cooling hole size on the adiabatic film cooling effectiveness over a rotating turbine blade section. The study was conducted using ANSYS FLUENT to determine the adiabatic wall temperature over the blade surface. The geometry was created to be a single section of a turbine rotating at 4000 rpm, and the blade increases in camber from tip to hub. Cylindrical cooling holes were created and the diameters were varied from 0.5 mm to 1.5 mm. The pitch-to-diameter ratio and the length-to-diameter ratio were kept constant at a value of …
Control Development For Autonomous Landing Of Quadcopter On Moving Platform, Rakhayai Mangsatabam
Control Development For Autonomous Landing Of Quadcopter On Moving Platform, Rakhayai Mangsatabam
Theses and Dissertations
This thesis focuses on the control development for autonomous landing of a quadcopter on a moving platform. The object tracking and path following is performed through on-board vision-based systems. The goal of the thesis is to develop a controller for autonomous landing of a quadcopter and test its fidelity with simulations and experiments. The thesis is carried out in two sections, simulation and experiment. The simulation was carried out based on the system modeled and a PD (Proportional Derivative) controller was used to simulate the quadcopter landing. The simulation was split into three parts, with each part attempting to become …
Cubesat Docking And Resource Sharing Mechanism, Shingo Kunito
Cubesat Docking And Resource Sharing Mechanism, Shingo Kunito
Theses and Dissertations
This thesis addresses the design concept of a CubeSat docking and resource sharing mechanism that allows to transfer propellant that is pressurized gas, data, and power. In docking and capture design, the interface is equipped with two air cylinders that are rated up to 20.68 MPa internal pressure generating the ideal force of 1218.4 N each. With the designed air cylinder and mounted configuration, the maximum capture distance between the target and the chaser CubeSat is 40.30 mm. Since air cylinder and body frame are designed specifically for this interface, structural analysis was conducted in ANSYS where results show a …
Analysis And Classification Of 3-D Printed Collagen-Bioglass Matrices For Cellular Growth Utilizing Artificial Neural Networks, Trevor Schmitt
Analysis And Classification Of 3-D Printed Collagen-Bioglass Matrices For Cellular Growth Utilizing Artificial Neural Networks, Trevor Schmitt
Theses and Dissertations
Introduction: Recent advances have shown the influence of biomimetic design on modulation of the extracellular matrix (ECM) and the role stiffness of it plays in cellular behavior. 2-D models for cellular growth poorly recapitulate the natural environment of cells, whereas application of a 3-D ECM model allows for a more biomimetic design for modeling cellular behavior. Integration of 45S5 Bioglass provides and osteostimulatory mineral component to these 3-D models, allowing for better mimicry of orthopedic design, affecting the mechanical and physiochemical properties of the ECM and leading to an increase in osteogenic behavior. 3-D Bioprinting allows for custom fabrication of …
Development, Testing, Analysis, And Efficiency Of A Variable Area Dredge In Combination With A Mobile Ferrate-Based Treatment Facility, Leigh Ann Provost
Development, Testing, Analysis, And Efficiency Of A Variable Area Dredge In Combination With A Mobile Ferrate-Based Treatment Facility, Leigh Ann Provost
Theses and Dissertations
This thesis proposal outlines the development and testing of a mobile slurry treatment trailer coupled with a variable area suction head and further expands on results and procedures shown in Feasibility of Muck Removal in the IRL Watershed and Subsequent Ferrate Treatment to Remove Excess Nutrients. The purpose of this thesis is to evaluate the efficiency and effectiveness of the suction head based on the percent solids maintained during dredging. This thesis also evaluates a scaled design and associated costs for a fully scaled dredging project utilizing the suction head. Additional statistics involving further fitting sediment data to a Weibull …
The Corrosion And Biofouling Characteristics Of Sealed Vs. Perforated Offshore Monopile Interiors: Experiment Design Comparing Corrosion And Environment Inside Steel Pipe, Monica M. Maher
Theses and Dissertations
This research addresses the need to improve on the existing methods for the corrosion control of the monopile interiors used to support wind powered turbines by incorporating a design that also enhances marine habitats and fisheries. Retrofitting monopile interiors with cathodic protection has been attempted on existing windfarms to mitigate corrosion, however, this can cause new problems including water acidification and hydrogen sulfide formation. Such chemistry changes can lead to unique localized corrosion concerns. This study investigated internal corrosion, chemistry and biofouling inside partially submerged hollow steel pipes. Watertight pipes with stagnant water inside were compared to pipes with holes …
Three Dimensional Nonlinear Simulation Of Quench Phenomenon In Superconducting Tapes Using Mesh-Free Monte-Carlo Method, Reza Bahadori
Three Dimensional Nonlinear Simulation Of Quench Phenomenon In Superconducting Tapes Using Mesh-Free Monte-Carlo Method, Reza Bahadori
Theses and Dissertations
Performing quench propagation simulations of full size superconducting coils is a challenging problem due to complex coil structures and internal arrangements of superconducting wires. In addition, superconducting wires and cables themselves constitute complex 3D arrangements comprised of superconductor, matrix, stabilizer, insulation and other materials. Modelling quenches in complete coils is therefore a complex multi-scale and multi-physics problem that is difficult to solve with conventional techniques like finite element or finite difference methods. Monte-Carlo methods have been successfully used to simulate various multi-scale and multi-physics problems, but to our knowledge have not been applied to quench propagation simulations. In the first …
Computational Support For Predicting Requirement Change Volatility In Complex System Design, Phyo Htet Hein
Computational Support For Predicting Requirement Change Volatility In Complex System Design, Phyo Htet Hein
Theses and Dissertations
Requirements play critical role in the design process as objective statements of stakeholders’ expectations. Design process is iterative, and requirements are also constantly changed and updated to reflect stakeholders’ expectations, design changes, regulations, resource limitations, etc. Managing requirement change is one of the most important requirement management tasks. Since requirements are driving factors in product development from initial concept development stage to final production, mismanaged requirement changes can adversely affect project health leading to monetary and time losses. The ability to assess a requirement change and predict its propagation early in the design process will enable engineers to make informed …
Exploratory Analysis Of Accuracy Monitoring Techniques In Vehicle Detection Systems For Intelligent Transportation Systems Applications And Maintenance, Manasi Sanjay Palod
Exploratory Analysis Of Accuracy Monitoring Techniques In Vehicle Detection Systems For Intelligent Transportation Systems Applications And Maintenance, Manasi Sanjay Palod
Theses and Dissertations
The goal of transportation management is to ensure the mobility of people and goods, in a reliable and efficient manner. Operation and maintenance of transportation infrastructure is key to accomplish their objectives. Intelligent Transportation Systems (ITS) applications rely on massive detection networks that collectively demand significant maintenance resources. Resource constraints force transportation agencies to look for innovative ways to optimize their operational and maintenance costs while serving their users at intended performance levels. The system inputs come from vehicle detection system (VDS), acting as field data collection devices, enabling traffic monitoring and management through response to specific conditions. This research …
Mitigating Loss Of Control In General Aviation: A Human-Systems Integrated Flight Test Method For Mapping Pilot Cognition And Aircraft Dynamics, Tiziano Bernard
Mitigating Loss Of Control In General Aviation: A Human-Systems Integrated Flight Test Method For Mapping Pilot Cognition And Aircraft Dynamics, Tiziano Bernard
Theses and Dissertations
General aviation (GA) loss of control accidents, in the United States, have continued to occur despite efforts by government and non-government research agencies. The lack of data during loss of control events (due to the absence of data recorders in small aircraft) does not allow for an accurate reconstruction of the accidents, causing accident investigators to focus on generic causes like pilot error. Flight test research has shown that there are various systems induced causal factors that can potentially set up an aircraft to depart controlled flight and do not aid pilot efforts. An example of these causal factors is …
A Framework For Characterizing The Security Posture Of Cyber Systems, Matthew Ridley
A Framework For Characterizing The Security Posture Of Cyber Systems, Matthew Ridley
Theses and Dissertations
Modern day applications can be spread across multiple virtual or physical systems, and be accessed or attacked by pretty much any one any where. Cybersecurity is used to mitigate these cyber threats but there are limited resources that can be dedicated to security. As result, trade-offs and decisions must be made around what is prioritized and what isn’t. Cyber risk management provides methodologies for identifying threats, evaluating risks and making decisions, however, it can be difficult to determine whether the system is actually secure enough and the risk is actually within an acceptable parameters. This thesis provides a framework for …
Human-Centered Design Of The Enhanced Pilot Learning Interface For The Aviation Community, De Vere Michael Kiss
Human-Centered Design Of The Enhanced Pilot Learning Interface For The Aviation Community, De Vere Michael Kiss
Theses and Dissertations
he purpose of this research is to introduce a new device to help pilots navigate aircraft manuals. This informational navigational tool is designed to improve learning by reducing the time it takes a pilot candidate to retrieve aircraft system information within an aircraft manual. The device is called the Enhanced Pilot Learning Interface, an Advanced Interactive Media. The research project is based on human-centered design and consists of participatory design, modeling and simulation, human-in-the-loop simulation (HITLS), and expert user experience. Additionally, a traditional research experimentation was conducted to collect supporting statistical data. Preliminary tests of four current professional airline pilots …
An Approach To Improve Single Photon Detectors For Highly Sensitive Applications, Ahmed Chyad Kadhim
An Approach To Improve Single Photon Detectors For Highly Sensitive Applications, Ahmed Chyad Kadhim
Theses and Dissertations
The problem of detecting a single photon is receiving considerable attention with the development of new single photon detectors in biophotonics, stressed free-space optical communication, low probability of intercept (LPI) optical communication, quantum communication, and remote sensing. The theoretical modeling of the waveforms of the single photon detector output produced in particular systems will expedite the search for and analysis of detected signals. Since SNSPDs require cooling to very low temperature, 4K, and PMTs work on the visible wavelength, current photon detection focus on research developing SPADs and using InGaAs/InP materials. However, SPADs can work over the infrared range of …
Implementation Of Music In A Simulated Unmanned Aircraft System (Uas) Monitoring Task To Alleviate The Vigilance Decrement, Maria Chaparro
Implementation Of Music In A Simulated Unmanned Aircraft System (Uas) Monitoring Task To Alleviate The Vigilance Decrement, Maria Chaparro
Theses and Dissertations
The vigilance decrement is a thoroughly researched phenomenon in psychological literature and has been identified in many monotonous tasks. Although the phenomenon has been recorded for approximately 80 years, no universal repair, or theory to account for its onset, has been identified. Jobs requiring monotonous task performance have been increasing as time has elapsed, in part due to the rise in automation. Furthermore, much of the vigilance literature does not address modern, more complex tasks, such as the Unmanned Aerial Systems (UAS) monitoring task. A potential method that has been proposed to combat the vigilance decrement is the inclusion of …
Cloud Based Wireless Sensor Monitoring, Pruthvi Devendrakumar Mistry
Cloud Based Wireless Sensor Monitoring, Pruthvi Devendrakumar Mistry
Theses and Dissertations
Internet of Things (IoT) brought a revolutionary change in embedded systems. It offloads the physical work of managing an equipment, appliance or device to a smart and network connected application. IoT makes it possible to monitor and control a huge network of devices remotely. The aim of this project is to develop a complete framework for smart data acquisition from a wireless sensor network to cloud servers. The framework includes configurable, low power, and small size embedded module that is attached to a sensor. The device reads data from the sensor and forwards them to the cloud server using the …
Comparing Specific Excess Power Of General Aviation Aircraft, Yohan Forbes Auguste
Comparing Specific Excess Power Of General Aviation Aircraft, Yohan Forbes Auguste
Theses and Dissertations
The high number of Loss of Control and Controlled Flight into Terrain Accidents in General Aviation (GA) suggests that there is a lack of understanding and recognition of low energy states by pilots of GA aircraft. As a result there is a desire to implement an energy management system in GA aircraft to alert the pilot of low energy conditions and to give the required corrective action to get to a desired energy state. This requires an understanding of the performance capabilities of GA aircraft in terms of their ability to change their energy state. The ability to change the …
An Experiment To Study The Gaseous Emissions Of A Gas Turbine Operated With Biodiesel As Fuel, David Lee Rochelle
An Experiment To Study The Gaseous Emissions Of A Gas Turbine Operated With Biodiesel As Fuel, David Lee Rochelle
Theses and Dissertations
A continually growing awareness of the finiteness of fossil fuel availability coupled with an ever better understanding of the negative effects of fossil fuel consumption has motivated a search for fuels that can be used in place of fossil fuels, but which can be derived from sustainable sources such as growable organic matter. While much work has been done to understand these substances and apply them on a larger scale (indeed, biodiesel is commonly included in commercially available diesel fuels at fuel pumps); the unique nature of the operating environment for aviation fuels has complicated the application of these substances …
Holistic Approach For Characterizing The Performance Of Wireless Sensor Networks, Amar Yusof Jaffar
Holistic Approach For Characterizing The Performance Of Wireless Sensor Networks, Amar Yusof Jaffar
Theses and Dissertations
Researchers are actively investigating wireless sensor networks (WSNs) with respect to node design, architecture, networking protocols, and processing algorithms. However, few researchers consider the impact of deployments on the performance of a system. As a result, an appropriate deployment simulator that estimates the performance of WSNs concerning several deployment variables is needed. This research presents a holistic deployment framework that assists decision makers in making optimum WSN deployment choices by considering the terrain of their region of interest and type of deployment. This framework employs empirical propagation models to predict the performance of the deployment in terms of connectivity, coverage, …
Real-Time Facial Expression And Speech Emotion Recognition App Development On Mobile Phones Using Cloud Computing, Humaid Saif Saeed Alasli Alshamsi
Real-Time Facial Expression And Speech Emotion Recognition App Development On Mobile Phones Using Cloud Computing, Humaid Saif Saeed Alasli Alshamsi
Theses and Dissertations
Emotion plays a vital role in humans’ daily lives. Understanding emotions and recognizing how to react to others’ feelings are fundamental to engaging in successful social interactions. Emotion recognition through facial expression and speech play a significant role in human communication. This subject is becoming important in academic research as new techniques such as emotion recognition from speech context inspire us to recognize how emotions are related to the content we are uttering. The demand and importance of emotion recognition have highly increased in many applications in recent years, such as video games, human-computer interactions, cognitive computing, and affective computing. …
Self-Assembly Of Protein Fibrils In Microgravity, Dylan Bell
Self-Assembly Of Protein Fibrils In Microgravity, Dylan Bell
Theses and Dissertations
Deposits of insoluble protein fibrils in human tissue are associated with amyloidosis and neurodegenerative diseases. Different proteins are involved in each disease; all are soluble in their native conformation in vivo, but by molecular self-assembly, they all form insoluble protein fibril deposits with a similar cross -sheet structure. The study of molecular self-assembly is also of interest to origin of life. The development of cellular activity was dependent upon the creation of large complex molecular structures in the chemical and environmental conditions present when life originated. Although life probably arose in a planetary environment, microgravity is known to effect cellular …