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Articles 1 - 16 of 16
Full-Text Articles in Engineering
Investigating The Influence Of Functional And Nonfunctional Requirements On Change And Change Propagation, Nathaniel Conde Voris
Investigating The Influence Of Functional And Nonfunctional Requirements On Change And Change Propagation, Nathaniel Conde Voris
Theses and Dissertations
The research presented in this thesis investigates the nature of change and change propagation in requirement documents as they are influenced by requirement type, that is, “Functional” or “NonFunctional,” and how an understanding of these types may refine utilization of the Automated Requirement Change Propagation Prediction (ARCPP) tool when used by design teams. Functionality is determined by asking the question “Does the requirement prescribe something for the project to accomplish?” This question separates the requirements into their requisite types. Using the ARCPP, the relationship and propagation scores were determined for each requirement. Furthermore, the number of relationships were determined for …
Towards Green Building: Energy Efficient Roof System For Buildings, Dhruv Sangal
Towards Green Building: Energy Efficient Roof System For Buildings, Dhruv Sangal
Theses and Dissertations
The present work focusses on investigating the thermal performance of different energy efficient roof systems for buildings for different climates. Buildings constitutes about 40 percent of total energy consumed by United States, and previous research shows that 20 percent of the building cooling load comes through ceiling of a building. Thus, it is important to analyze different energy efficient roof systems which can help in reducing building cooling and heating load. The present study focusses on three technologies – green roof, radiant barriers and photovoltaics. To analyze the performance of these systems, a detailed energy based mathematical model were developed …
Temporal Transformation Of Barrier Islands A Round Nakdong Estuary, Sukzun Youn
Temporal Transformation Of Barrier Islands A Round Nakdong Estuary, Sukzun Youn
Theses and Dissertations
The Nakdong Estuary system near Busan, South Korea consists of dynamic shorelines characterized by morphological transformations that result from both natural disasters (typhoons and flooding) and construction projects (Nakdong Estuary Dam, gates in the West Nakdong River and Busan New-ports). This study aims to synthesize existing data for tides, waves, bathymetry and meteorological data obtained from a variety of institutions with the objectives of (1) identifying and ranking major factors that influence morphological transformations and (2) determining how these factors influence morphological change over time. These objectives were met by analyzing patterns of flow and sediment transport using Center Point …
Skin Deformation Feedback For Force Sensory Substitution In Teleoperation And Virtual Reality Training, Samuel Schorr
Skin Deformation Feedback For Force Sensory Substitution In Teleoperation And Virtual Reality Training, Samuel Schorr
Link Foundation Modeling, Simulation and Training Fellowship Reports
For this work, we developed a wearable skin deformation device that is worn on the tip of the finger. The devices have two separate components, the first of which is a finger grounding interface that straps to the medial phalanx. The interface holds a magnetic tracking sensor from an Ascension 3D Guidance trakSTAR system, which provides tracking information about the position and orientation of the fingers in free space at 200 Hz.
Tuning Micro-Electro-Mechanical Resonators For Maximum Dynamic Range, Joseph William Fisher
Tuning Micro-Electro-Mechanical Resonators For Maximum Dynamic Range, Joseph William Fisher
Theses and Dissertations
This research seeks to improve the linear dynamic range (LDR) of micro-electromechanical systems (MEMS) resonators, which are commonly used in sensing and timing applications. We address specifically the need for devices whose response is relatively large yet remains single-valued near resonance. We develop and analyze a model for a class of electrostatically actuated micro structures that includes higher order electrostatic effects, thereby allowing one to determine the LDR for devices that are tuned to eliminate cubic order nonlinear effects. The inclusion of the capacitive forces produces a model that is best solved by expanding the force in a Taylor series. …
Improving Crash Safety Of Jet Dragsters Through Modeling And Analysis, Paige Leigh Sanchez
Improving Crash Safety Of Jet Dragsters Through Modeling And Analysis, Paige Leigh Sanchez
Theses and Dissertations
The objective of this thesis was to analyze how additional foam implementation in a jet dragster driver’s compartment can improve driver safety in the case of an accident. This analysis was divided into two sections: a crash simulation analysis and a base excitation mass-spring-damper model analyzing foam behavior. The jet dragster crash simulation modeled, reflected a Larsen Motorsports jet dragster accident in 2011, where a dragster hit the wall at 270 mph between a 43 to 60 degree angle. A static structural simulation, using the dragster chassis, was modeled in ANSYS and several dynamic simulations at varying impact angles were …
Cfd Analysis Of Resistance Characteristics Of High-Speed Displacement Hull Forms Fitted With Hull Vane®, Venkata Karthik Avala
Cfd Analysis Of Resistance Characteristics Of High-Speed Displacement Hull Forms Fitted With Hull Vane®, Venkata Karthik Avala
Theses and Dissertations
Improving the performance and resistance of a high-speed monohull forms has been of interest to Naval Architects for several decades. A considerable amount of research has been carried out in this area by using stern flaps and other appendages. This research thesis investigates the resistance characteristics of high-speed round bilge hull forms fitted with a Hull Vane® in the stern region of the vessel. The Hull Vane® is a fixed foil located below the waterline at the aft of the stern of the vessel. The Hull Vane® reduces the generation of waves at the aft and improves the vessel's motions. …
Dynamic Anchoring In Soft Regolith For Celestial Exploration, Tom Ebert
Dynamic Anchoring In Soft Regolith For Celestial Exploration, Tom Ebert
Theses and Dissertations
Recent exploration missions to celestial bodies have shown an increasing demand for surface based landers and rovers designed to perform experiments on the ground, rather than relying purely on traditional orbiting observatories. Many of the scientifically interesting locations have proven hazardous and difficult to reach and traverse, driving the need for different methods of locomotion. Some of these locations lie in deep, permanently shadowed craters or in rocky, highly uneven landscapes. Various wheeled, flying, jumping and legged rovers have been proposed, some of which have been implemented with success and problems alike. Even though the Curiosity rover has the largest …
An Empirical Examination Of Cognitive Chunking And Information Generation In Freehand Sketches During Design Ideation, Omar Magdy Ibrahim Zaki Mohammed Galil
An Empirical Examination Of Cognitive Chunking And Information Generation In Freehand Sketches During Design Ideation, Omar Magdy Ibrahim Zaki Mohammed Galil
Theses and Dissertations
This thesis proposes a method to measure information content of freehand sketches during design ideation based on the cognitive chunk formation. The research is broken down into two phases. The first is a protocol study to explore chunk formation in freehand sketches by novice designers while generating solutions for a novel design problem. The second is the identification of entities and functional relations explicitly expressed in the designers’ output. Next, a form neutral (F-ER) representation model is formulated, and information metrics are applied to measure the information content. This work is motivated by the notion that engineering design can be …
Dynamics Of Asymmetrical Configurations Of Catamaran Hull Forms, Vaibhav Aribenchi
Dynamics Of Asymmetrical Configurations Of Catamaran Hull Forms, Vaibhav Aribenchi
Theses and Dissertations
It is important to understand asymmetrical catamarans motions since it influences the loads which increases stress on structures while causing discomfort to passengers and crew members. Researchers so far have been mainly focused on motions characteristics of the conventional catamaran hull forms. There is scant literature or research work in the public domain on asymmetrical catamaran hull form, with regards to its seakeeping performance. This thesis undertakes a comparative analysis of the motion characteristics between newly developed alternative catamaran hull forms of different asymmetrical configurations. The asymmetrical catamarans developed from the original NPL round bilge catamaran hull forms have a …
Assessing The Hydrodynamic And Economic Impacts Of Biofouling On The Hull Of Surface Vessels Using Numerical Methods, Letchi Evrard Quentin Anoman
Assessing The Hydrodynamic And Economic Impacts Of Biofouling On The Hull Of Surface Vessels Using Numerical Methods, Letchi Evrard Quentin Anoman
Theses and Dissertations
Marine fouling on the hull of surface vessels is a topic of increasing importance in the maritime field for its environmental and financial impacts. Recent research developments have introduced mathematical models dealing with the frictional resistance associated with fouling, thus enabling to single out their impact on ship hydrodynamics. Herein, two implementations of these models are presented. The first implementation used Computational Fluid Dynamics to assess the additional drag induced by fouling for a specific ship model. With the software STAR CCM+, Reynolds Averaged Navier-Stokes equations have been used to model turbulence, wall laws parameters have been adapted to suit …
A Physical And Computational Comparison Of Floating Breakwater Design Efficiencies For Habitat Restoration In The Indian River Lagoon, Abigail Lynn Stehno
A Physical And Computational Comparison Of Floating Breakwater Design Efficiencies For Habitat Restoration In The Indian River Lagoon, Abigail Lynn Stehno
Theses and Dissertations
This study examines the design and implementation of floating breakwaters (FB) in the Indian River Lagoon (IRL) to support and protect living shoreline restoration projects from damaging wave climates. The design significant wave climate of the IRL in a 0.6 m water depth had an incident significant wave height of 0.20 m with a wave period of 1.6 s. Based on previous studies, it has been found that habitat restoration will be successful if the wave height is reduced from 0.20 m to 0.10 m with the use of a FB structure. FB structures attenuate wave energies and are transportable, …
Empirical Study Of In-Plane Shrinkage And Bulging Of Circular Cylinders Fabricated With The Fused Deposition Modeling Additive Manufacturing Method, Kirill Martusevich
Empirical Study Of In-Plane Shrinkage And Bulging Of Circular Cylinders Fabricated With The Fused Deposition Modeling Additive Manufacturing Method, Kirill Martusevich
Theses and Dissertations
This thesis presents a set of empirical studies, leading to three Design for Additive Manufacturing (DfAM) tools for estimating diametric shrinkage and the longitudinal variation of diameter in circular cylinders produced by the Fused-Deposition Modeling (FDM) method. First, four experiments are conducted by additively printing 50 cylinders and taking 1900 measurements in order to study the variation of diametric shrinkage along the cylinder axis and the variation of shrinkage as functions of four parameters of the cylinder: top and bottom thicknesses, diameter, height, and shell thickness. These four subjects of study are addressed as five research questions and are answered …
Design Of A 3d Printable Mechanical Time Simulating Solar System Model For Use In Stem Education, Mark Bedford Moffett
Design Of A 3d Printable Mechanical Time Simulating Solar System Model For Use In Stem Education, Mark Bedford Moffett
Theses and Dissertations
The use of designed tools to assist with relating abstract ideas to reality is now a possibility with the use of the modern manufacturing method of 3D printing. The inner four planets’ natural orbital periods with respect to Earth were modeled in SolidWorks and then fabricated using 3D printing. A 3D printable mechanical time simulating solar system model used in science, technology, engineering, and mathematics (STEM) could assist with the user’s understanding of the history of science, planetary orbital mechanics, gearing ratios, 3D printing, and systematically constructing a project using instructions. This paper describes the design of a 3D printable …
Hydrodynamic Resistance Of A Surfboard: An Analytical, Empirical, And Statistical Analysis, Andrew Leonard Kledzik
Hydrodynamic Resistance Of A Surfboard: An Analytical, Empirical, And Statistical Analysis, Andrew Leonard Kledzik
Theses and Dissertations
The objective of the present study defines a drag coefficient for a 9’0” surfboard. The hydrodynamic drag of a surfboard is derived from theory outlining the mathematical foundation used. Analytical solutions provide values for boundary layer thickness, momentum flux width, shear stress, drag force and the drag coefficient. This study also examines maximum velocities attainable from in-situ observations of surfers paddling in a controlled environment. The theoretical predictions are compared with experimental observations of surfboard resistance; while simultaneously validating instrumentation and methods of measurement. A number of problems are highlighted, ranging from mathematical problems on turbulent flow analysis to impacts …
Anomalous Decay Of Nanomechanical Modes Going Through Nonlinear Resonance, Oriel Shoshani, Steven W. Shaw, Mark I. Dykman
Anomalous Decay Of Nanomechanical Modes Going Through Nonlinear Resonance, Oriel Shoshani, Steven W. Shaw, Mark I. Dykman
Mechanical and Civil Engineering Faculty Publications
Because of the small size of nanomechanical systems, their vibrations become nonlinear already for small amplitudes. Many nontrivial aspects of the vibration dynamics arise from the coexistence of several nonlinearly coupled modes. We show that such coupling can lead to anomalous decay of the modes where they go through nonlinear resonance, so that their amplitude-dependent frequencies become commensurate. We demonstrate the possibility of a strongly nonmonotonic dependence of the decay rate on the amplitude if one of the modes serves as a thermal reservoir for another mode. Where the decay of both modes is slow compared to the rate of …