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2018

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Articles 2431 - 2460 of 8951

Full-Text Articles in Engineering

A Framework For Optimal Path Planning And Nonlinear Guidance For Autonomous Mobile Robots, Paul A. Quillen Aug 2018

A Framework For Optimal Path Planning And Nonlinear Guidance For Autonomous Mobile Robots, Paul A. Quillen

Mechanical and Aerospace Engineering Dissertations - Archive

The purpose of this research is to investigate methods and technology for enhancing autonomous capabilities for mobile robots. The measures of autonomy which are specifically covered in this dissertation pertain to a mobile robot’s ability to make decisions and act, in other words guidance and control. This dissertation puts forth a framework using optimal path planning and nonlinear guidance techniques to address these matters. The path plans are synthesized using a numerical navigation function algorithm that will form its potential contour levels based on the “minimum control effort” of the system. Additionally, extensions of the path planning algorithm in the …

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Numerical And Experimental Study Of Single Phase And Multiphase Droplet Dynamics On Electrowetting-On-Dielectrode Digital Micro-Fluidics, Mun Mun Nahar Aug 2018

Numerical And Experimental Study Of Single Phase And Multiphase Droplet Dynamics On Electrowetting-On-Dielectrode Digital Micro-Fluidics, Mun Mun Nahar

Mechanical and Aerospace Engineering Dissertations - Archive

In the recent years, significant efforts have been devoted to the development of droplet based lab-on-a-chip devices of which advantages include being programmable and reconfigurable. Among various droplet flow based microsystems [1-5], electrowetting on dielectric (EWOD) digital microfluidics has many advantages, such as rapid switching response, no joule heating, no need for moving parts like pumps and valves, and most importantly low power requirement [6]. Basic droplet handling techniques - droplet dispensing, transporting, merging and splitting - can be done by sequentially activating and deactivating specific electrodes, which allows to address each droplet individually and to perform various unit processes …

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A Multiphysics Study Of Interfacial Properties Of 3d Printed Filaments, Alireza Rezaee Aug 2018

A Multiphysics Study Of Interfacial Properties Of 3d Printed Filaments, Alireza Rezaee

Mechanical and Aerospace Engineering Dissertations - Archive

Fused Deposition Modeling has become the most popular 3-D printing method over the last decade. Due to its potential to save time, cost and, labor, there is a great deal of interest to use this technique for production of functional load carrying parts and assemblies in bio-medical, automotive, aerospace, and oil and gas industries. In general, materials used in FDM process are isotropic; however, parts printed using FDM process show anisotropic mechanical properties with inconsistent properties in the transverse direction to the filaments’ cross-section. This anisotropic behavior is due to the fabrication process, and the inconsistency in the transverse mechanical …

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Characterizing Contamination To Expand Ashrae Envelope In Airside Economization And Thermal And Reliability In Immersion Cooling Of Data Centers, Jimil Manojbhai Shah Aug 2018

Characterizing Contamination To Expand Ashrae Envelope In Airside Economization And Thermal And Reliability In Immersion Cooling Of Data Centers, Jimil Manojbhai Shah

Mechanical and Aerospace Engineering Dissertations - Archive

The Datacom facility which comprises rooms or closets used for communication, computers/servers or electronic equipment requires cooling unit which consumes 31% (23% HVAC cooling + 8% HVAC fans) of overall energy. The ASHRAE TC9.9 subcommittee, on Mission Critical Facilities, Data Centers, Technology Spaces, and Electronic Equipment, has suited the data center’s executives by permitting brief period outings of the environmental conditions outside the prescribed temperature-humidity range, into passable extents A1-A3. To comprehend the expanding server densities and the required cooling vitality costs, data center operators are falling back on cost cutting measures. For instance, they are not firmly controlling the …

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Woods Tire Model, Priyank Vasant Nandu Aug 2018

Woods Tire Model, Priyank Vasant Nandu

Mechanical and Aerospace Engineering Theses - Archive

The performance of a racecar in a maneuver is almost totally determined by the characteristics of the tires and the suspension setup. If the suspension is properly tuned for the maneuver, then the limiting factor is the tire. Therefore, any racecar design and performance analysis must start with a full description of the performance of the tire [1]. Mathematical models for tire performance such as the Pacejka model have been in use for a long time and have become the standard for expressing how a tire will perform dynamically. It comprises of curve fit to experimental data and requires about …

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Achieving Novel Functionalities In Semiconductor-Crystalline Oxide Heterostructures Through Electrical And Structural Coupling, Kamyar Ahmadi-Majlan Aug 2018

Achieving Novel Functionalities In Semiconductor-Crystalline Oxide Heterostructures Through Electrical And Structural Coupling, Kamyar Ahmadi-Majlan

Material Science and Engineering Dissertations - Archive

Creating new materials that exhibit enhanced or novel behaviors is essential to meet the technological challenges we face today. Complex oxides are perfect candidates to overcome these challenges due to the range of electronic, optical, and ionic properties they exhibit. The research presented here, mainly focuses on overcoming two important challenges in oxide electronics. First,the ability of epitaxially growing multifunctional oxides on conventional semiconductor substrates and second, the successful integration of multifunctional oxide properties on semiconductors Oxide molecular beam epitaxy was utilized to grow transition metal oxides with unprecedented control, layer-by-layer, at the atomic scale. Such control of growth enables …

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An Investigation Of The Plasma Electrolytic Oxidation Mechanism For Coating Of Alumina-Zirconia Nanocomposite, Nastaran Barati Aug 2018

An Investigation Of The Plasma Electrolytic Oxidation Mechanism For Coating Of Alumina-Zirconia Nanocomposite, Nastaran Barati

Material Science and Engineering Dissertations - Archive

Plasma Electrolytic Oxidation (PEO) is an electrochemical surface modification technique which is able to coat ceramic coatings on valve metals from either cationic or anionic species in an aqueous electrolyte. Applying high voltage in the range of 300-600 V is required to achieve crystalline phases. PEO is a clean technology which offers several benefits including high deposition rates, excellent adhesion strength and mechanical properties. One of the interesting capabilities of the PEO process is its ability to form composite coatings. The following work aims to study the growth mechanism of nanocomposite layers coated by PEO. Two experimental routs have been …

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Spectral-Domain Phase-Sensitive Interferometry For Real-Time Probing Of Electrodeposition Processes, Yujen Chiu Aug 2018

Spectral-Domain Phase-Sensitive Interferometry For Real-Time Probing Of Electrodeposition Processes, Yujen Chiu

Material Science and Engineering Dissertations - Archive

Electrodeposition is a simple, versatile and scalable method for depositing thin metal films on conductive substrates, and it has long been used in large-scale industrial processes for metal film coating. In the last two decades, electrodeposition has entered into the manufacturing processes of electronic devices. Electrodeposition of Cu has become the standard process for the backend processes for almost all microelectronic devices. Electrodeposition of Cu and magnetic materials are used in the fabrication of write/read head in computer hard disk drive. More recently, a unique electrodeposition process, under potential deposition (UPD), has been utilized for atomic layer deposition to generate …

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Investigation Of Surface Contamination In A Cu-Based Al Alloy Occurring During Tem Sample Preparation, Kelly Claunch Aug 2018

Investigation Of Surface Contamination In A Cu-Based Al Alloy Occurring During Tem Sample Preparation, Kelly Claunch

Material Science and Engineering Theses - Archive

This thesis investigates the nature of surface contamination originating from the jet-polishing process on Cu-6 wt% Al TEM disks. During previous TEM imaging and diffraction analysis performed by our group, surface contamination particles, roughly 15-60 nm in diameter, were observed on the surface of the jet-polished TEM disks. Further, TEM diffraction analysis revealed that the contamination particles were growing epitaxially on the Cu matrix. HR-SEM was used to characterize the surface contamination in terms of shape, size, composition, and distribution on the surface of the disks. Through extensive HR-SEM imaging, it was found that surface contamination particles are present on …

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Detection Of Molecular Biomarkers Involved In The Induction Of Emt, Migration And Invasion, And Drug Resistance In Breast Cancer Cells In 3d Confinement, Tamara Nicole Hill Aug 2018

Detection Of Molecular Biomarkers Involved In The Induction Of Emt, Migration And Invasion, And Drug Resistance In Breast Cancer Cells In 3d Confinement, Tamara Nicole Hill

Bioengineering Dissertations - Archive

Standard-of-care regimes for cancer treatment have become more effective and sophisticated over the last decade due to research developments which facilitate specific targeting of treatments to certain cancers, and the ability to provide specialized care to cancer patients. However, cancer treatments overall still fall short of preventing spread of disease from the primary tumor to secondary sites where they settle and form new more aggressive tumors. It is this stage of disease progression which results in the majority of cancer deaths. The long-term goal of this research is to develop a system for the effective high throughput screening of chemotherapeutic …

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Fabrication And In Vitro Characterization Of An Implant For The Detection Of Metastatic Cancer Cells, Carlos Martin Cantu Aug 2018

Fabrication And In Vitro Characterization Of An Implant For The Detection Of Metastatic Cancer Cells, Carlos Martin Cantu

Bioengineering Theses - Archive

Greater than 90% of cancer related deaths are due to metastasis (Hayes & Wicha, 2011). Since current conventional techniques detect the disease by the time that it has become systemic, our lab has developed a hydrogel based cancer trap that can attract metastatic cancer cells via cytokine release. However, for continual monitoring and accessibility to the gel, an implant is needed for delivery, retention, and retrieval of the gel. The research undergone in this thesis seeks to develop such a method. Namely, the objective was to develop a polylactide (PLA) based implant that is capable of delivering and retaining a …

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Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino Aug 2018

Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino

Civil Engineering Dissertations - Archive

Elevating a residential house appears to be one of the most effective techniques to eliminate or alleviate flood losses. In general, the elevation procedures involve raising a house as well as its typical slab-on-grade (SOG) foundation and supporting it with an additional support system. The unconcerned effects of the drastic changes in support condition could lead to severe structural damages and failure of houses. After elevated, thus, such slabs must be properly supported and retrofitted, for which the available methodology and know-how is almost nonexistent. The fiber reinforced polymer (FRP) application, considered as a promising technique in the rehabilitation of …

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Development Of Mussel Inspired Nanocomposite Adhesives For Biomedical Applications, Nikhil Pandey Aug 2018

Development Of Mussel Inspired Nanocomposite Adhesives For Biomedical Applications, Nikhil Pandey

Bioengineering Dissertations - Archive

Popular bioadhesives, such as fibrin, cyanoacrylate and albumin–glutaraldehyde-based materials, have been applied for clinical applications in wound healing, drug delivery, and bone and soft tissue engineering; however, their performances are limited by weak adhesion strength and rapid degradation. The long-term goal of this research is to develop a strong tissue adhering nanocomposite for tissue interfacing and wound healing applications. We begin by developing a mussel-inspired, nanocomposite–based, biodegradable tissue adhesive by blending poly (lactic-co-glycolic acid) (PLGA) or N-hydroxysuccinimide modified PLGA nanoparticles (PLGA-NHS) and polydopamine nanoparticles with mussel-inspired polymers. Adhesive strength measurement of the nanocomposites on porcine skin-muscle constructs revealed that the …

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Nanoparticles For Gene Therapy And Protein Delivery To Induce Angiogenesis As An Alternative Treatment For Peripheral Arterial Disease, Linda Christellia Noukeu Aug 2018

Nanoparticles For Gene Therapy And Protein Delivery To Induce Angiogenesis As An Alternative Treatment For Peripheral Arterial Disease, Linda Christellia Noukeu

Bioengineering Dissertations - Archive

Peripheral arterial disease (PAD) is defined as a slow, progressive disorder of the lower extremity arterial vessels characterized by chronic narrowing that often results in occlusion and is associated with loss of functional capacity. Although the PAD occurrence rate is increasing in the elderly population, outcomes with current treatment strategies are suboptimal. Hence, there is an urgent need to develop new technologies that overcome limitations of traditional modalities for PAD detection and therapy. In this research, nanoparticles have been developed and used as carriers for various therapeutic agents to treat PAD. In particular, via protein/gene delivery, we developed and formulated …

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Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad Aug 2018

Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad

Civil Engineering Dissertations - Archive

This research resulted in the development of a new method for performing displacement control analysis of distributed loads to obtain the ultimate shear strength of structural components. A framework, consisting of several sub-frames, was designed to convert the single displacement applied at the top of the framework to equivalent uniformly-distributed forces applied to the beam. To validate the loading mechanism, using the proposed framework, the load was applied on the top of a reinforced concrete beam in the laboratory, and numerical studies were conducted. The shear capacity of the beam under a concentrated load at mid-span was compared with the …

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In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina Aug 2018

In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina

Civil Engineering Dissertations - Archive

Fire events and impact damage on bridges are few of the least understood of common extreme events. Bridge infrastructures that are subjected to hazards such as fire or impact from over height vehicle can catastrophically collapse or be heavily damaged. External wrapping of damaged concrete bridge components with Fiber Reinforced Polymer (FRP) laminates has been used as a strengthening technique for these bridges. Two such in-service bridges, one of which was fire damaged and the other impact damaged, both aged more than 50 years old in Irving, Texas, were selected for this study. The damaged beams of the concrete bridges …

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Thermodynamic Modeling And Transient Simulation Of A Low-Pressure Heat Recovery Steam Generator Using Siemens T3000, Andres Caesar Aug 2018

Thermodynamic Modeling And Transient Simulation Of A Low-Pressure Heat Recovery Steam Generator Using Siemens T3000, Andres Caesar

Electronic Theses and Dissertations

With world energy consumption rising, and nonrenewable energy resources quickly depleting, it is essential to design more efficient power plants and thereby economically utilize fossil fuels. To that end, this work focuses on the thermodynamic modeling of steam power systems to enhance our understanding of their dynamic and transient behavior. This thesis discusses the physical phenomena behind a heat recovery steam generator (HRSG) and develops a mathematical description of its system dynamics. The model is developed from fundamentals of fluid dynamics, phase change, heat transfer, conservation laws and unsteady flow energy equations. The resulting model captures coupled physical phenomena with …

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Electrochemical Microsensors For In Situ Monitoring Of Chemical Compounds In Engineered And Natural Aquatic Systems, Jared Church Aug 2018

Electrochemical Microsensors For In Situ Monitoring Of Chemical Compounds In Engineered And Natural Aquatic Systems, Jared Church

Electronic Theses and Dissertations

The adaption of needle-type electrochemical microsensor (or microelectrode) techniques to environmental science and engineering systems has transformed how we understand mass transport in biotic and abiotic processes. Their small tip diameter (5-20μm) makes them a unique experimental tool for direct measurements of analytes with high spatial and temporal resolutions, providing a quantitative analysis of flux, diffusion, and reaction rate at a microscale that cannot be obtained using conventional analytical tools. However, their applications have been primarily limited to understanding mass transport dynamics and kinetics in biofilms. With the advancement of sensor fabrication and utilization techniques, their potential applications can surpass …

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Design Survey Of Laminated Composite I-Beam, Mrinmoy Saha Aug 2018

Design Survey Of Laminated Composite I-Beam, Mrinmoy Saha

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Composite I-beams are popular for high-strength low-weight applications. Learning the macro-mechanics and designing the composite I-beam properly are necessary. In this report, a design overview of the composite I-beam is discussed which is based on classical lamination theory where it includes the homogenization approach, the plane stress assumption and the Kirchhoff hypothesis. Using these assumptions, a method was developed to come up with the effective material properties of a beam. Formulas to calculate maximum deflection and maximum bending stress and shear stress and the stress concentration at the connection of web-flange are discussed which describe ways for designing and manufacturing …

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Investigation Of Thermo-Physical Property Enhancement Mechanism Of Molten Salt Nano-Eutectic Via Nanostructural Change And Polyalphaolefin Nanofluid Via In Situ Formation Of Superstructures, Zahra Pournorouz Aug 2018

Investigation Of Thermo-Physical Property Enhancement Mechanism Of Molten Salt Nano-Eutectic Via Nanostructural Change And Polyalphaolefin Nanofluid Via In Situ Formation Of Superstructures, Zahra Pournorouz

Mechanical and Aerospace Engineering Dissertations - Archive

For many years, scientists enhanced the specific heat capacity of molten salt nanofluids by dispersing only minute concentrations of different nanoparticles (e.g., 1 wt.%). While the specific heat capacity for molten salts was enhanced in many types of research, other engineering fluids (i.e., water, ethylene glycol, oil) showed decreased specific heat capacity with doping the nanoparticles. Recently, researchers discovered that a unique nanostructure formed by molten salt molecules, which were doped and interacted with nanoparticles, were the reason for enhanced specific heat capacity. Therefore, the enhanced specific heat capacity only happens for molten salts rather than other fluids that may …

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Wireless Antenna Sensors For Boiler Condition Monitoring, Franck Tchafa Aug 2018

Wireless Antenna Sensors For Boiler Condition Monitoring, Franck Tchafa

Mechanical and Aerospace Engineering Dissertations - Archive

Structural Health Monitoring (SHM) is a vital technology that implements real-time condition monitoring or damage detection mechanisms for the safety assurance of structural systems such as power stations, aircrafts, bridges, dams, buildings, large machinery, and more. Without proper and timely maintenance, mechanical systems are prone to failures since they experience detrimental factors such as harsh environments, excessive loads, and vibrations. Several sensing technologies exist for SHM applications. Patch antennas are among the list of these technologies, and they are an attractive choice due to their compact size, light weight, ease of manufacturing, and low fabrication cost. Patch antennas have been …

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Developing A Framework To Optimize The Operations Of An Intermodal Underground Freight Transportation Terminal Using Simulation, Fatemeh Rezaeifar Aug 2018

Developing A Framework To Optimize The Operations Of An Intermodal Underground Freight Transportation Terminal Using Simulation, Fatemeh Rezaeifar

Civil Engineering Dissertations - Archive

According to the U.S. Department of Transportation (USDOT), by 2040, nearly 30,000 miles of our busiest highways will be clogged daily and it is important to increase the capacity of our transportation system. Construction of intermodal underground freight transportation (UFT) systems for freight movement through underground pipelines or tunnels, can increase the capacity of the existing shipping network. The intermodal terminal is a major component of the UFT’s innovative infrastructure project. Increasing demand for container transportation systems in terminals will raise the risk of terminal congestion and delivery delay due to the increase in freight transportation system bottlenecks (traffic jams …

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Bio-Inspired Adaptive Tuning Of Human-Robot Interfaces, Bakur Alqaudi Aug 2018

Bio-Inspired Adaptive Tuning Of Human-Robot Interfaces, Bakur Alqaudi

Electrical Engineering Dissertations - Archive

Motivated by recent advancement in neurocognitive in brain modeling research, multiple model-based Q-learning structures are proposed for optimal tracking problem of time-varying discrete-time systems. This is achieved by utilizing a multiple-model scheme combined with adaptive resonance theory (ART), and dopamine-like model. In the ART algorithm , dopamine-like model and generates sub-models based on the match-based clustering method utilizing. A responsibility signal governs the likelihood of contribution of each sub-model to the Q-function. The Q-function is learned using the batch least-square algorithm. Simulation results are added to show the performance and the effectiveness of the overall proposed control method. A novel …

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An Enhancement Of Light Reflectance Spectroscopy As A Modality For The Detection Of Positive Surgical Margins In Radical Prostatectomy, Zengxing Pang Aug 2018

An Enhancement Of Light Reflectance Spectroscopy As A Modality For The Detection Of Positive Surgical Margins In Radical Prostatectomy, Zengxing Pang

Bioengineering Theses - Archive

Light Reflectance Spectroscopy (LRS) is an imaging method that has shown increasingly promising evidence in its ability to detect various forms of cancer tissues. Our previous studies have illustrated the LRS modality’s capacity to differentiate normal and cancerous prostate tissues, specifically in its effectiveness in distinguishing cancer tissues classified 4+3 and 4+4 in Gleason Score. Despite having shown sufficient sensitivity and specificity towards prostate cancer detection, the pre-existing imaging system remains impractical for its intended clinical application of detecting positive surgical margins during prostatectomy. Two of the biggest challenges in the current equipment include lack of mobility and slow data …

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Proposing A Sparse Weighted Directed Network Construction Method And A Novel Mutual-Information Based Sparse Feature Selection Algorithm For Multivariate Time-Series Analysis And Its Application In Medical Diagnostic Problems, Rahilsadat Hosseini Aug 2018

Proposing A Sparse Weighted Directed Network Construction Method And A Novel Mutual-Information Based Sparse Feature Selection Algorithm For Multivariate Time-Series Analysis And Its Application In Medical Diagnostic Problems, Rahilsadat Hosseini

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The main purpose of this study is feature engineering/learning from multivariate (MV) time-series to achieve a more interpretable model by dimension reduction. This aim is fulfilled in 2 main parts. In part 1, we proposed a network estimation approach namely SWDN which stands for sparse weighted directed network. In this approach, the directed subgraph of the underlying network was detected by maximum spanning tree (MST) algorithm that created a null model of connections with maximum inter-dependence (pairwise correlation or mutual information) forming the backbone structure of the MV time-series as an empirical reference. The edge weights were estimated using the …

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Supervised Sparse Learning With Applications In Bioinformatics, Kin Ming Puk Aug 2018

Supervised Sparse Learning With Applications In Bioinformatics, Kin Ming Puk

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

In machine learning and mathematical optimization, sparse learning is the use of mathematical norms such as L1-norm, group norm and L21-norm in order to seek a trade-off between the goodness-of-fit measure and sparsity of the result. Sparsity of result leads to a parsimonious learning model - in other words, only few features from the data matrix are required to build the learning model and for further interpretation. The motivations of employing sparse learning in bioinformatics are two-fold: firstly, a parsimonious learning model enhances the explanatory power; and secondly, a parsimonious model generally allows better prediction and generalizes better to new …

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A Calibration Chamber For Thermo-Hydro-Mechanical Studies Of Soil Behavior Via Resonant Column Testing, Daniel R. C. Green Aug 2018

A Calibration Chamber For Thermo-Hydro-Mechanical Studies Of Soil Behavior Via Resonant Column Testing, Daniel R. C. Green

Civil Engineering Theses - Archive

Abstract A Calibration Chamber for Thermo-hydro-mechanical Studies of Soil Behavior via Resonant Column Testing Daniel R. C. Green The University of Texas at Arlington, 2018 Supervising Professor: Dr. Laureano Hoyos A considerable portion of the emerging geothermal infrastructure in the country is located in earthquake prone areas while being supported and/or surrounded by soil deposits located well above the groundwater table. Geotechnical earthquake research in the country, however, continues to be mostly focused on soil response under saturated conditions, especially soil liquefaction phenomena, while most of the work on dynamic response of compacted soils has not taken suction or thermal …

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Investigations On Hydrothermally Synthesized Co3o4/Mnxco3-Xo4 Core-Shell Nanoparticles, Ning Bian Aug 2018

Investigations On Hydrothermally Synthesized Co3o4/Mnxco3-Xo4 Core-Shell Nanoparticles, Ning Bian

Graduate Theses/Dissertations

Two different morphologies (pseudo-spherical shaped or PS type and hexagonal nanoplate shaped or NP type) and two different concentrations (0.07 M and 0.1 M) of manganese incorporated Co3O4@MnxCo3-xO4 core-shell nanoparticles (CSNs) were investigated, respectively. The motivation of this work is to investigate the magnetic properties of, and specifically the exchange bias, between different shaped CSNs and between different Mn-doped CSNs. A two-step synthesis method was utilized to obtain the CSNs: a soft chemical approach was used to obtain Co3O4 nanoparticles and a hydrothermal nano-phase epitaxy was used to …

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Statistical Meta-Model For Air Traffic Flow And Capacity Management Based On Airspace Optimization-Simulation: The Continuous Challenge Of The Hub Of The America Congestion, Juan Marcos Castillo Aug 2018

Statistical Meta-Model For Air Traffic Flow And Capacity Management Based On Airspace Optimization-Simulation: The Continuous Challenge Of The Hub Of The America Congestion, Juan Marcos Castillo

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Panama is only Country on the Americas with a Canal and the hub of Logistics that include the interaction of the Atlantic and the Pacific in a less than a day. This Logistics growth after the Panama Canal Expansion resulted in an overwhelming growth in Aviation. Furthermore, the economic and Logistic growth at Panama is increasing the demand of air transportation and it is creating potential for Air Logistics. Thus, the air traffic congestion is one of the greatest challenges that the Aviation Industry is seeking to address. The objective of this research is to understand if the Air Traffic …

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Developable Compliant-Aided Rolling-Contact Mechanisms, Todd G. Nelson, Just L. Herder Aug 2018

Developable Compliant-Aided Rolling-Contact Mechanisms, Todd G. Nelson, Just L. Herder

Student Works

Rolling-contact mechanisms can provide low-friction motion with unique kinematic paths. We show that developable surfaces can be used as a design tool for rolling-contact mechanisms joined with compliant bands. These mechanisms can exhibit 3D motion paths, couple rotational and translational motions into a single degree of freedom, and can be designed to exhibit various tailored kinetic responses. We set forth developable surface parametrizations well suited to the creation of rolling contacts. We highlight how the geodesic and principal curvatures of the non-ruling principal curves of a developable surface are meaningful design quantities for rolling contacts. We provide kinematic and kinetic …

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