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Articles 5281 - 5310 of 11138

Full-Text Articles in Engineering

Deployable Antenna For Cubesat, Mackenzie Thomas Lennon, Caleb Andrew Barber, David Matthew Galves Jun 2017

Deployable Antenna For Cubesat, Mackenzie Thomas Lennon, Caleb Andrew Barber, David Matthew Galves

Mechanical Engineering

This project is a proof-of-concept ground model of a large deployable antenna designed for the small space requirements of CubeSats. This small deployment module is designed to fit a 2 m by 1 m reflective antenna inside a storage volume of with the dimensions 20 cm by 20 cm x 40 cm. The reflector will be deployed to a parabolic shape with the goal of modeling the reflector necessary for high frequency communication. Because this module is designed as a proof-of-concept for the deployable parabolic reflector specifically, no electrical components will be incorporated and will just focus on the deployment …

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Polysat Helmholtz Cage, Alex Nichols, Nicolas Le Renard, Jordan Skaro, Louie Thiros, Madeline Tran Jun 2017

Polysat Helmholtz Cage, Alex Nichols, Nicolas Le Renard, Jordan Skaro, Louie Thiros, Madeline Tran

Mechanical Engineering

The MagCal5 Helmholtz cage project is an interdisciplinary approach to provide the PolySat/CubeSat research lab with a magnetic testing environment for the calibration of magnetic components and verification of various control laws. The Cal Poly CubeSat organization is the home of the CubeSat Specification, and acts as a testing and integration facility for CubeSats built by universities across the world. The PolySat organization is a CubeSat developer that works with numerous industry partners to design, manufacture, and operate CubeSats to further scientific advancement. The addition of a magnetic test stand to the lab will allow CubeSat to extend to the …

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An Investigation Of Avian Wing Tip Vortex Generation Using A Biomimetic Approach, David Stewart Martin Jun 2017

An Investigation Of Avian Wing Tip Vortex Generation Using A Biomimetic Approach, David Stewart Martin

Master's Theses

An experimental study has been conducted to develop a process allowing the creation of biologically accurate aerodynamic test models mimicking the slotted primary feather geometry of the Brown Pelican (Pelecanus occidentalis). Preserved examples of both a full Brown Pelican wing and a single primary feather were 3D scanned and digitally reconstructed using a combination of MATLAB and CAD software. The final model was then 3D printed as a collection of smaller components using a LulzBot TAZ 6 printer and Taulman3D T-Glase PET filament. After using various surface finishing techniques to improve the finish of all 3D printed parts, …

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Design Of A Compact Helical Counterflow Heat Exchanger, Aravindakshan Thirumalai Ananthanpillai Jun 2017

Design Of A Compact Helical Counterflow Heat Exchanger, Aravindakshan Thirumalai Ananthanpillai

Theses and Dissertations

Compact heat exchangers are desirable in many aerospace applications. New additive manufacturing approaches, such 3D printing, have enabled the fabrication of heat exchange devices utilizing geometries that cannot be fabricated using traditional approaches. The new geometries enabled by 3D printing may result in higher heat transfer using smaller devices, however, constraints associated with the fabrication of these devices also impose potential performance degradations. This document presents the design and analysis of a novel, compact counter flow heat exchanger which uses helically shaped passages to enhance the effectiveness of the heat transfer. Although the helical passages increase the heat transfer and …

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Invariant-Based Method For Improving Efficiency Of Mechanical Testing In Aerospace Certification Of Carbon Fiber-Epoxy Composites, Alyssa Rina Gruezo, Erika Gabrielle Hansen Jun 2017

Invariant-Based Method For Improving Efficiency Of Mechanical Testing In Aerospace Certification Of Carbon Fiber-Epoxy Composites, Alyssa Rina Gruezo, Erika Gabrielle Hansen

Materials Engineering

The current challenge with qualification of carbon fiber composites in the aerospace industry would be the low efficiency of testing hundreds of samples. The Trace Theory strives to streamline the qualification process by utilizing a material’s Trace to predict properties of composites using Excel programs and basis data. To test this theory, predicted properties from the program, QuickLam, were compared to experimental data. Unidirectional 0° (T1), unidirectional 90° (T2), quasi-isotropic (T3), and hard quasi-isotropic (T4) laminates were made using HexTowR carbon fiber and TC250 resin provided by TenCate Advanced Composites. Tensile and compression tests were done according to ASTM D3039 …

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Modeling And Simulation Of A Sounding Rocket Active Stabilization System, Steven M. Maclean Jun 2017

Modeling And Simulation Of A Sounding Rocket Active Stabilization System, Steven M. Maclean

Master's Theses

The Horizon Simulation Framework is a modeling and simulation framework developed to verify system level requirements. In this thesis, the framework is extended to include the Dynamic position type that existed in the early development phase of the framework. The Dynamic position type is tested through the modeling and simulation of a sounding rocket. An active control system based on linear-quadratic regulator (LQR) control theory is implemented and tested in the simulation to determine the overall effect on altitude. A first order aerodynamics and aeroprediction model are created within the framework to allow for rapid changes early in the design …

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Atomic Oxygen Considerations For Leo De-Orbit Trajectories Using Solar Sails, Daniel A. Fugett Jun 2017

Atomic Oxygen Considerations For Leo De-Orbit Trajectories Using Solar Sails, Daniel A. Fugett

Master's Theses

Solar sails have the potential to benefit many future space exploration missions, but they lack the heritage required for present-day use. To grow confidence in solar sail technology, they could be deployed on LEO satellites higher than 600 km to help de-orbit the satellite within 25 years upon mission termination. To determine how atomic oxygen would affect the solar sail, material from Lightsail-2 was tested in a thermal-energy, isotropic, atomic oxygen vacuum chamber based in the space environments laboratory in California Polytechnic State University. The sail material, aluminized Mylar, was tested for its survivability on both the coated and uncoated …

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Stereoscopic 3-D Presentation For Air Traffic Control Digital Radar Displays, Jason G. Russi, Brent T. Langhals, Michael E. Miller, Eric L. Heft May 2017

Stereoscopic 3-D Presentation For Air Traffic Control Digital Radar Displays, Jason G. Russi, Brent T. Langhals, Michael E. Miller, Eric L. Heft

AFIT Patents

An apparatus and method of presenting air traffic data to an air traffic controller are provided. Air traffic data including a two dimensional spatial location and altitude for a plurality of aircraft is received. A disparity value is determined based on the altitude for each aircraft of the plurality of aircraft. Left and right eye images are generated of the plurality of aircraft where at least one of the left and right eye images is based on the determined disparity value. The left and right eye images are simultaneously displayed to the air traffic controller on a display. The simultaneously …

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Hybrid Buoyant Aircraft: Future Stol Aircraft For Interconnectivity Of The Malaysian Islands, Anwar Ul Haque, Waqar Asrar, Ashraf Ali Omar, Erwin Sulaeman, Jaffar Syed Mohamed Ali May 2017

Hybrid Buoyant Aircraft: Future Stol Aircraft For Interconnectivity Of The Malaysian Islands, Anwar Ul Haque, Waqar Asrar, Ashraf Ali Omar, Erwin Sulaeman, Jaffar Syed Mohamed Ali

Journal of Aviation Technology and Engineering

Hybrid buoyant aircraft are new to the arena of air travel. They have the potential to boost the industry by leveraging new emerging lighter-than-air (LTA) and heavier-than-air (HTA) technologies. Hybrid buoyant aircraft are possible substitutes for jet and turbo-propeller aircraft currently utilized in aviation, and this manuscript is a country-specific (Malaysia) analysis to determine their potential market, assessing the tourism, business, agricultural, and airport transfer needs of such vehicles. A political, economic, social, and technological factors (PEST) analysis was also conducted to determine the impact of PEST parameters on the development of buoyant aircraft and to assess all existing problems …

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Low Cost Missions For The Unordinary Innovators, Robert J. Twiggs May 2017

Low Cost Missions For The Unordinary Innovators, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Low Cost Missions for the Unordinary Innovators" from May 23, 2017.

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Design And Computational Fluid Dynamics Analysis Of An Idealized Modern Wingsuit, Maria E. Ferguson May 2017

Design And Computational Fluid Dynamics Analysis Of An Idealized Modern Wingsuit, Maria E. Ferguson

McKelvey School of Engineering Graduate Student Theses & Dissertations

The aerodynamics of a modern wingsuit has been the subject of very few detailed scientific studies to date. The prevailing design process remains the dangerous “sew and fly” method, in which designs are tested when they are first flown. This study utilizes Computational Fluid Dynamics (CFD) tools to analyze the flow field and aerodynamics of an idealized wingsuit, which is designed using Computer-Aided Design (CAD) modeling. The 3D CAD software Autodesk Inventor is used to create the wingsuit model, which is designed with a Gottingen 228 airfoil cross-section and a relatively large planform of aspect ratio 1.3. The commercial flow …

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Uncertainty Quantification Of Turbulence Model Closure Coefficients On Openfoam And Fluent For Mildly Separated Flows, Ike Witte May 2017

Uncertainty Quantification Of Turbulence Model Closure Coefficients On Openfoam And Fluent For Mildly Separated Flows, Ike Witte

McKelvey School of Engineering Graduate Student Theses & Dissertations

In this thesis, detailed uncertainty quantification studies focusing on the closure coefficients of eddy-viscosity turbulence models for several flows using two CFD solvers have been performed. Three eddy viscosity turbulence models considered are: the one-equation Spalart-Allmaras (SA) model, the two-equation Shear Stress Transport (SST) k-ω model, and the one-equation Wray-Agarwal (WA) model. OpenFOAM and ANSYS Fluent are used as flow solvers. Uncertainty quantification analyses are performed for subsonic flow over a flat plate, subsonic flow over a backward-facing step, and transonic flow past an axisymmetric bump. In the case of flat plate, coefficients of pressure, lift, drag, and skin friction …

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Aerodynamics And Vortex Structures Of A Flapping Airfoil In Forward Flight In Proximity Of Ground, Hang Li May 2017

Aerodynamics And Vortex Structures Of A Flapping Airfoil In Forward Flight In Proximity Of Ground, Hang Li

McKelvey School of Engineering Graduate Student Theses & Dissertations

The traditional flapping wing high lift mechanism research mainly focuses on the wing in unbounded flow. However, the real insect flight includes not only the unbounded flow field but also the near-surface flight. Therefore, research on near-surface flight can help reveal the high-lift mechanism of insect flight and should also be beneficial to the research on Micro-Air-Vehicles (MAV). In this thesis, the flow fields of an airfoil in hover and forward flight are simulated in the presence of ground by newly available function of “dynamic meshing” in ANSYS Fluent is employed. The characteristics of aerodynamics, pressure distribution, and vortex structure …

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Aerodynamics And Shock Buffet Of A Transonic Airfoil In Ground Effect, Boshun Gao May 2017

Aerodynamics And Shock Buffet Of A Transonic Airfoil In Ground Effect, Boshun Gao

McKelvey School of Engineering Graduate Student Theses & Dissertations

No abstract provided.

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Numerical Study Of The Aerodynamics Of Dlr-F6 Wing-Body In Unbounded Flow Field And In Ground Effect, Ning Deng May 2017

Numerical Study Of The Aerodynamics Of Dlr-F6 Wing-Body In Unbounded Flow Field And In Ground Effect, Ning Deng

McKelvey School of Engineering Graduate Student Theses & Dissertations

The main focus of this thesis is on the simulation of flow past a three-dimensional wing-body configuration (DLR-F6) in ground effect; a complex 3D wing-body configuration in ground effect has never been analyzed in the aerodynamics literature to date. For the purpose of validation of the simulation approach, computations are performed for the DLR-F6 wing-body in unbounded flow and are compared with the experimental data. The commercial CFD solver ANSYS FLUENT is employed for computations. Compressible Reynolds-Averaged Navier-Stokes (RANS) equations in conjunction with Spalart-Allmaras (SA) and - Shear Stress Transport (SST) turbulence models are solved. The validated code is employed …

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Speculations On A City For Mars, Edouard Terzis May 2017

Speculations On A City For Mars, Edouard Terzis

School of Architecture - Theses

This thesis proposes the reinterpretation of architectural forms as the index of the constitution of the idea of the city. “Speculations on a City on Mars” is paradoxical in a sense as it superposes both the managerial representation of a city, that is Zoning, along with the speculative aspect of an extra-terrestrial city.

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Using Activated Charcoal To Reuse Anesthetic Gas, Patrick Kolbay, Joseph Orr, Kai Kück May 2017

Using Activated Charcoal To Reuse Anesthetic Gas, Patrick Kolbay, Joseph Orr, Kai Kück

Utah Space Grant Consortium

General anesthesia enables surgery, with anesthesia machines being the predominant tool to do so. However, these machines are hard to maintain, costly, and require significant supporting infrastructure. The current design of anesthesia machines demands the disposal of anesthetic gases at a rate equal to fresh oxygen entering the system. This causes several orders of magnitude more anesthetic vaporized than needed, yielding negative economic and environmental impact. To address this, we propose utilizing the porous surface of activated charcoal to absorb and desorb the anesthetic gases to be reused.

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A Hydrodynamic Model For Plasmasphere Refilling Following Geomagnetic Storms, Kausik Chatterjee, Robert W. Schunk May 2017

A Hydrodynamic Model For Plasmasphere Refilling Following Geomagnetic Storms, Kausik Chatterjee, Robert W. Schunk

Utah Space Grant Consortium

The refilling of the plasmasphere following a geomagnetic storm remains one of the longstanding problems involving ionosphere-magnetosphere coupling. Both diffusion and hydrodynamic approximations have been adopted for the modeling and solution of this problem. The diffusion approximation neglects the nonlinear inertial term in the momentum equation and so this approximation is not rigorously valid immediately after a storm. The principle focus of this work is the formulation and development of a hydrodynamic refilling model (that includes the nonlinear inertial term) using the fluxcorrected transport method, a numerical method that is extremely well suited to handling nonlinear problems with shocks and …

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Using Hotspot Analysis And Detection Of Early Season Invasives (Desi) To Analyze The Temporal And Spatial Dynamics Of Invasive Cheatgrass (Bromus Tectorum)., Tara B.B. Bishop, J. Belnap, S. Munson, R. A. Gill, Sam B. St. Clair May 2017

Using Hotspot Analysis And Detection Of Early Season Invasives (Desi) To Analyze The Temporal And Spatial Dynamics Of Invasive Cheatgrass (Bromus Tectorum)., Tara B.B. Bishop, J. Belnap, S. Munson, R. A. Gill, Sam B. St. Clair

Utah Space Grant Consortium

The invasion of exotic annual grasses during the last century has transformed plant habitats and communities worldwide. Cheatgrass (Bromus tectorum) is a winter annual grass that has invaded over 100 million acres of the western United States (Pellant and Hall, 1994. Pellant, 1996). Cheatgrass quickly utilizes available resources especially after a disturbance to the landscape. A major impact of invasion is the increased frequency in fires (D’Antonio and Vitousek, 1992). As cheatgrass is highly successful at invading open and disturbed landscapes at a rapid pace it increases the frequency and severity of fires in arid landscapes (Brooks, 2005). …

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Linking Quantitative Motor Assessments To The Underlying Brian Injury: A Preliminary Report, Paula Johnson, Clay Kincaid, Nathan Muncy, Steven K. Charles May 2017

Linking Quantitative Motor Assessments To The Underlying Brian Injury: A Preliminary Report, Paula Johnson, Clay Kincaid, Nathan Muncy, Steven K. Charles

Utah Space Grant Consortium

Using custom software and an inexpensive novel motion capture controller, we adapted and automated traditional subjective motor assessments in an integrated system to develop a quantitative motor assessment (QMA) that is low-cost, and highly sensitive. Twelve participants who have suffered a traumatic brain injury performed the QMA and had MRI scans of their brain. We compared the individual QMA results from the TBI group to normative standards (developed in an earlier work). We also compared the QMA results to measures of damage found in MRI results. Preliminary analysis of a subset of data are reported here.

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Acoustic Measurements Of Lithium-Ion Battery Electrode Films, Kathryn L. Dallon, Jing Yao, Dean R. Wheeler, Brian A. Mazzeo May 2017

Acoustic Measurements Of Lithium-Ion Battery Electrode Films, Kathryn L. Dallon, Jing Yao, Dean R. Wheeler, Brian A. Mazzeo

Utah Space Grant Consortium

This research investigates the use of acoustic measurements as an alternative means of non-destructive quality control for Li-ion battery films. The goal of this research is to enable accurate, non-destructive inspection of the battery electrode as it is being manufactured, so that problems can be identified and addressed early on. Here we report on our efforts to distinguish between films with different mechanical properties using acoustic resonances and surface acoustic wave (SAW) velocity. We were able to differentiate between films of various coating thicknesses using resonance measurements. We also used resonance measurements to monitor a material as it dried. SAW …

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Desorption Electrospray Ionization (Desi) Mass Spectrometric Imaging Of Spatially Regulated In Vivo Metabolic Rates, Charlotte R. Lewis, Richard H. Carson, Mercede N. Erikson, Anna P. Zagieboylo, Bradley C. Naylor, Kelvin W. Li, John C. Price, Paul B. Farnsworth May 2017

Desorption Electrospray Ionization (Desi) Mass Spectrometric Imaging Of Spatially Regulated In Vivo Metabolic Rates, Charlotte R. Lewis, Richard H. Carson, Mercede N. Erikson, Anna P. Zagieboylo, Bradley C. Naylor, Kelvin W. Li, John C. Price, Paul B. Farnsworth

Utah Space Grant Consortium

Desorption electrospray ionization (DESI) is an ambient ionization technique used for mass spectrometric imaging of biological samples. When coupled with isotopic ratio measurements of deuterium-labeled tissues, DESI provides a means of measuring metabolic rates on a spatially resolved basis. In vivo metabolic rates are desired to better understand diseases such as Alzheimer’s, Parkinson’s, and Huntington’s and to study the impact of space travel on muscle tissue growth and wasting. Although DESI has been used to image lipids and metabolites of a variety of tissues and other imaging techniques, such as NIMS, have been used to study kinetic turnover rates, DESI …

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Towards Unsupervised Deep Learning Based Anomaly Detection, Trevor Landeen, Jacob Gunther May 2017

Towards Unsupervised Deep Learning Based Anomaly Detection, Trevor Landeen, Jacob Gunther

Utah Space Grant Consortium

Novelty or anomaly detection is a challenging problem in many research disciplines without a general solution. In machine learning, inputs unlike the training data need to be identified. In areas where research involves taking measurements, identifying errant measurements is often necessary and occasionally vital. When monitoring the status of a system, some observations may indicate a potential system failure is occurring or may occur in the near future. The challenge is to identify the anomalous measurements that are usually sparse in comparison to the valid measurements. This paper presents a land-water classification problem as an anomaly detection problem to demonstrate …

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Considering Manufacturability In The Design Of Deployable Origami-Adapted Mechanisms, Erica B. Crampton, Spencer P. Magleby May 2017

Considering Manufacturability In The Design Of Deployable Origami-Adapted Mechanisms, Erica B. Crampton, Spencer P. Magleby

Utah Space Grant Consortium

Primary barriers to greater implementation of deployable origami-adapted mechanisms are their manufacturability and robustness. This paper discusses manufacturability in the design of such mechanisms through presenting and examining three examples. Manufacturability lessons gathered from these examples include the importance of joint-panel interfaces and how techniques and approaches for origami-adapted design can be customized to meet the needs of a specific product. As the manufacturability of deployable origami-adapted products is addressed and improved, their robustness will also improve, thereby enabling greater use of origami-adapted design.

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An Optical-Based Aggregate Approach To Measuring Condensation Heat Transfer, Kimberly A. Stevens, Julie Crockett, Daniel R. Maynes, Brian D. Iverson May 2017

An Optical-Based Aggregate Approach To Measuring Condensation Heat Transfer, Kimberly A. Stevens, Julie Crockett, Daniel R. Maynes, Brian D. Iverson

Utah Space Grant Consortium

Condensation heat transfer is significant in many applications such as such as desalination, energy conversion [1], atmospheric water harvesting [2, 3], electronics cooling, and other high heat flux applications [4]. However, condensate on the surface adds a thermal resistance that limits condensation rates. The rate of condensation heat transfer is inversely proportional to the diameter of the condensate drops [5]. In industrial condensing systems, the resistance is minimized by removing the condensate via gravity or a vapor shear, but the minimum size of droplet removal is typically on the order of the capillary length of the condensate, about 2.7 mm …

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Electrochemical Sensing With High Aspect Ratio Carbon Nanotube Platforms, Benjamin J. Brownlee, Brian D. Iverson May 2017

Electrochemical Sensing With High Aspect Ratio Carbon Nanotube Platforms, Benjamin J. Brownlee, Brian D. Iverson

Utah Space Grant Consortium

Increased sensitivity of electrochemical sensors is important for detection of low analyte concentrations. A unique flow-through sensor is demonstrated by depositing nanostructured platinum catalyst onto high aspect ratio, porous membranes of vertically-aligned carbon nanotubes (CNTs). Convective mass transfer enhancement was shown to improve the platinum-nanowire-coated CNT (PN-CNT) sensor performance in amperometric sensing of hydrogen peroxide (H2O2). Over 90% of the H2O2 was oxidized as it passed through the PN-CNT sensor, even for low concentrations in the range of 50 nM to 500 μM. This effective utilization of the analyte in detection demonstrates the …

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An Efficient Linear Octree-Based Grid Toward Magnetic Fluid Stimulation, Sean Flynn, Parris Egbert May 2017

An Efficient Linear Octree-Based Grid Toward Magnetic Fluid Stimulation, Sean Flynn, Parris Egbert

Utah Space Grant Consortium

An Eulerian approach to fluid flow provides an efficient stable paradigm for realistic fluid simulation. However its reliance on a fixed-resolution grid is not ideal for simulations that exhibit both large and small-scale fluid phenomena. A coarse grid can efficiently capture large-scale effects like ocean waves, but lacks the resolution needed for small-scale phenomena like droplets. On the other hand, a fine grid can capture these small-scale effects, but is inefficient for large-scale phenomena. Magnetic fluid, or ferrofluid, illustrates this problem with its very fine detail centered about a magnet and lack of detail elsewhere. Our new fluid simulation technique …

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Targeting Sram Fpga Components Using A Two-Photon Absorption Laser, Matthew Cannon Andrés Pérez-Celis, Michael Wirthlin May 2017

Targeting Sram Fpga Components Using A Two-Photon Absorption Laser, Matthew Cannon Andrés Pérez-Celis, Michael Wirthlin

Utah Space Grant Consortium

State-of-the-art SRAM FPGAs (Field Programmable Gate Arrays) are being increasingly considered for use in space applications, due to their reprogrammability and many dedicated resources that implement many common tasks at high speeds. However, the programmable fabric and resources are susceptible to ionizing radiation common in space, causing the device to fail. The radiation effects of all the components need to be known in order to develop effective mitigation techniques. This information, however, is difficult to obtain through typical broadbeam ion testing, due to low observability rates of the components. This paper present the results of a study to use a …

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Implementation Of Openfoam For Inviscid Incompressible Aerodynamic Flows, Jackson T. Reid, Douglas F. Hunsaker May 2017

Implementation Of Openfoam For Inviscid Incompressible Aerodynamic Flows, Jackson T. Reid, Douglas F. Hunsaker

Utah Space Grant Consortium

This paper is the description of the Utah State University AeroLab’s Aerodynamic Center Analysis Tool (AeroCAT), which is an implementation of the OpenFOAM CFD toolbox. AeroCAT takes in a user input file, generates a mesh, and solves a steady, inviscid, incompressible flow, automatically repeating the process for a range of angles of attack. It then processes the results to predict the wing’s span-wise locus of aerodynamic centers. The mesh generator used in this tool is GridX, developed by a former PhD student at USU, and the CFD solver is OpenFOAM.

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Simultaneous Two-Site Photometry In Attitude Determination Of Resident Space Objects, Arun Bernard, David Geller May 2017

Simultaneous Two-Site Photometry In Attitude Determination Of Resident Space Objects, Arun Bernard, David Geller

Utah Space Grant Consortium

Attitude determination of space objects is difficult due to the non-linearity of the data and sparseness of available measurements. The combination of simultaneous photometry from two observation sites allows for more information to be obtained in a shorter amount of time. The characterization of the parameters necessary to complete this simultaneous two-site photometry are presented along with simulated results.

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