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Articles 751 - 780 of 3180

Full-Text Articles in Engineering

Experimental Study Of Flexural Behavior Of Preflex Sfrc-Encased Steel Joist Composite Beams, Niraj Narendra Bankatlal Bora May 2020

Experimental Study Of Flexural Behavior Of Preflex Sfrc-Encased Steel Joist Composite Beams, Niraj Narendra Bankatlal Bora

Civil Engineering Theses - Archive

This study investigates the behavior of encased steel composite beams in straight and preflex beams, constructed and tested at Civil Engineering Laboratory Building (CELB). Upwards camber is provided in the steel sections in steel angles and HSS tube in the composite beam encased in Steel fibers reinforced concrete (SFRC). Experimental procedure has been performed to study the flexural behavior of composite steel joists encased in SFRC. Compressive strength, tensile strength and modulus of rupture are computed. The physical properties of steel fiber reinforced concrete are calculated through testing at the UTA Civil Engineering Laboratory Building. Eighteen cylindrical (4”x8”) specimens, eighteen …

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The Development Of On-Chip Optofluidic Droplet Lasers, Han Zhang May 2020

The Development Of On-Chip Optofluidic Droplet Lasers, Han Zhang

Electrical Engineering Dissertations - Archive

Optofluidic lasers have been an emerging field for the applications of biological sensing and diagnosis, chemical sensing, and point-of-care devices. Droplets, as optical cavities, confines whispering gallery modes with high quality factors in small volumes. Optofluidic droplet lasers have brought the droplet-based microfluidics and droplets as micro-resonators to one platform, showing potentials on applications in highly sensitive bio/chemical detection, tunable lasers, cell tracking and tissue imaging. Until now, optofluidic droplet lasers can be categorized into two types, static droplet lasers and droplet lasers on the flow. Static droplet lasers offer long lifetime for biosensing, while droplet lasers on the flow …

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Fabrication And Examination Of Magnetic Bacterial Cellulose As A Material For Biomedical Engineering, Xi Chen May 2020

Fabrication And Examination Of Magnetic Bacterial Cellulose As A Material For Biomedical Engineering, Xi Chen

Bioengineering Theses - Archive

Bacterial cellulose (BC) is one of the most abundant biopolymers in nature. Several attributes such as facilitative modification, high pore size/porosity, able to mass produce as well as biocompatibility renders BC a promising candidate for many fronts of biomedical engineering. One consideration for BC as a biomedical material over conventional plant cellulose is the ease in which BC can be obtained to provide high purity cellulose. In comparison to collagen, another biopolymer with considerable prospects for biomedical engineering, BC possesses a higher degree of elasticity, water retention, and lower degradability. The high affinity towards water and high porosity provide BC …

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Examination Of The Effects Of Confined Migration On Androgen Resistant Prostate Cancer And Potential Treatment Option For Drug Resistant Pc3 Cells With Calcitriol, Emily Torrey Ann Hills May 2020

Examination Of The Effects Of Confined Migration On Androgen Resistant Prostate Cancer And Potential Treatment Option For Drug Resistant Pc3 Cells With Calcitriol, Emily Torrey Ann Hills

Bioengineering Theses - Archive

When localized to the prostate, prostate cancer (PCa) has a near 100% 5-year survival rate, however, when prostate cancer metastasizes the survival rate drastically drops to around 30%. The low death rate of primary PCa is due to the wealth of knowledge we have of non-metastatic cancer and the sufficient treatment regimens. However, this understanding does not apply to metastatic cancer, so therapies are greatly lacking. To gain a better understanding of the invasion process for PCa we utilized microchannel technology to uncover the differences between migratory and non-migratory PCa. Specifically, the following study examines the effects of confined migration …

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Robust, Time-Critical, Evidence-Based Adaptive Data Fusion, Mohammad Amin Javadi May 2020

Robust, Time-Critical, Evidence-Based Adaptive Data Fusion, Mohammad Amin Javadi

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Sensors have become inevitable part of many studies and working areas ranging from navigation, transportation and medical applications. A sensor can help a user in a variety of situations including dangerous, inaccessible, time and money-consuming circumstances. Applying multiple sensors simultaneously allows for improving the accuracy of measurement estimates for system states. As an example, a part of this study uses a GPS sensor to increase the accuracy of the position estimation obtained by an IMU in an indoor environment. The same GPS device with position outputs can also be studied to provide a new measuring dimension such as velocity. This …

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Some New Results On Statistical Information And Evidence, Maryam Moghimi May 2020

Some New Results On Statistical Information And Evidence, Maryam Moghimi

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

This dissertation represents an attempt to relate some fundamental statistical problems using the notions of information, entropy, and evidence.

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Impact Of Viscoelastic Properties Of Low Loss Printed Circuit Boards (Pcbs) On Reliability Of Wcsp Packages Under Drop Test, Akshay Boovanahally Lakshminarayana May 2020

Impact Of Viscoelastic Properties Of Low Loss Printed Circuit Boards (Pcbs) On Reliability Of Wcsp Packages Under Drop Test, Akshay Boovanahally Lakshminarayana

Mechanical and Aerospace Engineering Theses - Archive

Reliability of electronic packages is a major concern as different failure modes are induced due to factors such as temperature loads, mechanical stresses, humidity, corrosion and so on. Finite element analysis (FEA) is often performed to assess reliability under different loading conditions such as thermal cycling, drop testing, power cycling and vibrational loads. Having accurate material property data is one of the key requirements to perform successful FEA study, and a significant amount of time and money is spent to perform accurate material characterizations. Lump modeling approach, where components are represented by a block and assigned effective properties, is commonly …

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Measurement Of Change In Cte Of Pcbs Due To Single Phase Immersion Cooling And Impact Of Changed Properties Of Pcbs On Solder Joint Reliability Of Bga Package, Sameer Hemant Dhandarphale May 2020

Measurement Of Change In Cte Of Pcbs Due To Single Phase Immersion Cooling And Impact Of Changed Properties Of Pcbs On Solder Joint Reliability Of Bga Package, Sameer Hemant Dhandarphale

Mechanical and Aerospace Engineering Theses - Archive

Oil immersion cooling in high-density data centers is emerging as an alternative for traditional air cooling because of the less power consumption, capacity to handle high power density and less space requirement. To adopt this technique extensively, effect of immersion on reliability of server components in dielectric coolant needs to be evaluated. One of the major reliability concerns in BGA package is 2nd level solder joint failure. The primary reason of solder joint failure is CTE mismatch between the PCB and the package. Also, difference in stiffness of the PCB and the package affects the solder joint reliability. As properties …

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Single Step Fabrication Of Shape Morphing 3d Surfaces, Amirali Nojoomi May 2020

Single Step Fabrication Of Shape Morphing 3d Surfaces, Amirali Nojoomi

Material Science and Engineering Dissertations - Archive

Shape-changing materials that can adopt programmable 3-dimensional (3D) shapes offer promise for a wide range of applications. Form the formation of the leaves and flowers to the shaping of complex organs, the analogues of such shape-morphing 3D surfaces are abundant in nature. However, since the formation of such surfaces in biological systems is fundamentally different from that of human-made materials, replicating their complex morphologies, movements, and thereby functions remains a challenge. Inspired by living organisms, we introduce an approach, called digital light 4D printing (DL4P), that encodes thermosensitive 2D hydrogels with a specific pattern of network density and thus temperature-induced …

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Numerical Investigation Of Concrete Breakout Strength Of Anchors In Shear Within Fiber Reinforced Concrete, Yash Hitendrakumar Patel May 2020

Numerical Investigation Of Concrete Breakout Strength Of Anchors In Shear Within Fiber Reinforced Concrete, Yash Hitendrakumar Patel

Civil Engineering Theses - Archive

This study investigates the numerical analysis of concrete breakout strength of cast in place anchors in shear within synthetic fiber reinforced concrete (SYN-FRC). A three dimensional, full-scale model was developed using the ABAQUS 6.14 software. The 3D solid elements with consideration of material nonlinearities were chosen to stimulate the SYN-FRC beam anchorage. The numerical analysis was conducted with a fixed loading rate of 300lb per step to obtain the behavior of fiber-reinforced concrete breakout with design-mix compressive strength of 4,000 psi and fiber volume fraction of 0%, 0.5%, 1.0%, and 1.5%. An inverse analysis was used to calibrate the material …

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Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion, Nikhil Vasant Moon May 2020

Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion, Nikhil Vasant Moon

Civil Engineering Theses - Archive

This research investigates the effect of an accidental explosion of a steam boiler in a boiler room on steel fiber reinforced concrete (SFRC) structure in an industrial facility, using nonlinear analysis in ABAQUS FEA software. The mechanical properties of SFRC are calculated through testing at the UTA Civil Engineering Laboratory Building. Steel fiber dosages in concrete at different volume fractions are examined for the mechanical properties of concrete. In total, 9 (4” x 8”) cylindrical specimens for compressive strength and modulus of elasticity test, 9 (4” x 8”) cylindrical specimens for tensile strength test, and 9 (6” x 6” x …

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Identifying And Addressing Improvement Opportunities In Primary Care Clinics, Mozhdeh Sadighi May 2020

Identifying And Addressing Improvement Opportunities In Primary Care Clinics, Mozhdeh Sadighi

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

ABSTRACT: The main aim of this dissertation is to study how unrecognized opportunities for improving efficiency of in-person patient visits in a primary care clinic can be identified and addressed. To fulfill this goal, the research is divided into three distinct but related sections. Section one, with the most holistic view, uses a combination of scientific and rigorous methods along two research paths and, as a result, explores two opportunities for improvement in the clinic. These opportunities are high patient waiting time and unbalanced workload. Sections two and three each focus on underlying conditions driving one of these two opportunities. …

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Design Optimization Of An Elastically Supported Multi-Beam Rotordynamic System To Minimize Flexural Response With Considerations For Robustness, Bret R. Hauser May 2020

Design Optimization Of An Elastically Supported Multi-Beam Rotordynamic System To Minimize Flexural Response With Considerations For Robustness, Bret R. Hauser

Mechanical and Aerospace Engineering Dissertations - Archive

Modern rotating machines are often required to operate with a small physical footprint and/or overall weight; necessitating that they utilize wide-ranging shaft speed to accomplish needed power levels. It is not uncommon that these designs also be required to support operation through a speed range encompassing multiple Critical Speeds while also limiting flexural vibrations to acceptable levels. Design optimization of this class of problem can be particularly difficult in that responses can be highly multi-modal and, when coupled with Finite Element (FE) solvers meet the conditions of a High Dimensional, Computationally Expensive Black Box (HEB) system. Because of this, some …

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Examining Current State Of Practice Of Enhancing Visibility Of Winter Operations Vehicles, Wasiq Ameen May 2020

Examining Current State Of Practice Of Enhancing Visibility Of Winter Operations Vehicles, Wasiq Ameen

Civil Engineering Theses - Archive

Despite precautions taken by the operators of maintenance vehicles, insufficient visibility of winter operations vehicles cause many collisions in the United States. Numerous methods have been developed to enhance the visibility of winter operations vehicles. Although the visibility of winter operations vehicles has enhanced through these methods, the consistency in the implementation of the methods for enhancing their visibility is critical to avoid collisions. The inconsistencies in the implementation of the methods confuse the public who are traveling in winter conditions when visibility is low. The confusion leads to a delay in perception time and response time of the drivers …

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Toward A Seismic Resistant Steel Staggered Truss Framing System (Stf), Ra'ed Al-Mazaidh May 2020

Toward A Seismic Resistant Steel Staggered Truss Framing System (Stf), Ra'ed Al-Mazaidh

Civil Engineering Dissertations - Archive

The Staggered Truss Framing (STF) system is a type of steel structural system used in mid- to high-rise buildings. It was initially developed in the 1960s in order to create a steel framing system that has low floor-to-floor height (9 to 10 ft.) and wide column-free space (60 to 80 ft.). This system consists of a series of story-high trusses spanning the total width between two rows of exterior columns and arranged in a staggered pattern on adjacent column lines. Due to the staggered layout, lateral seismic force transfer in the STF system is also in a staggered manner from …

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Synthesis Of Nickel-Titanium Intermetallic Surface Coatings Via Electrolytic Plasma Processing, Brody Allen Moore May 2020

Synthesis Of Nickel-Titanium Intermetallic Surface Coatings Via Electrolytic Plasma Processing, Brody Allen Moore

Material Science and Engineering Theses - Archive

Electrolytic plasma processing (EPP) is an environmentally friendly surface cleaning and deposition technique. Dependant on circuit polarity, anionic or cationic species can be deposited from an aqueous electrolyte bridge, resulting in characteristic nanograin surface morphology and very high deposition rates. This work was conducted to study the EPP process, develop optimal parameters for the synthesis of very hard surface coatings, and study the resultant physical and electrochemical properties of produced titanium-nickel intermetallic surfaces. This study focuses on Ni deposited onto pure Ti surfaces for improvement of surface wear, hardness, and corrosion properties while retaining uncompromised Ti bulk characteristics. The surface …

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Quantification Of Nocturnal Blood Pressure Oscillations In Obstructive Sleep Apnea Patients, Yao Shun Chuang May 2020

Quantification Of Nocturnal Blood Pressure Oscillations In Obstructive Sleep Apnea Patients, Yao Shun Chuang

Bioengineering Theses - Archive

An approach to quantifying and analysis of nocturnal blood pressure (BP) variations that are elicited by sleep-disordered breathing (SDB) is presented. A sample-by-sample aggregation of the dynamic BP variations during normal breathing and BP oscillations prompted by apnea episodes is performed. This approach facilitates the visualization and analysis of BP oscillations. Nocturnal BP oscillations reflect the cardiovascular stresses that SDB mediates and may be of clinical significance. Preliminary results from an analysis of full night study of 10 SDB subjects (8 Male 2 Female, 53±5.7 yrs., Body Mass Index 34.5±7.8 kg/m2, Apnea-Hypopnea Index 63.5±28.7) are presented. Aggregate trajectory and quantitative …

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Mathematical Modeling Approaches In Sustainable Food Supply Chains, Amin Gharehyakheh May 2020

Mathematical Modeling Approaches In Sustainable Food Supply Chains, Amin Gharehyakheh

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Access to high quality and safe food is vital for sustainable development in societies. Perishable foods lose a major portion of their quality after harvesting until the consumption point due to poor storage and distribution conditions. Thus, improvements in food supply chain operations are very critical in the sustainable development of society and the industry. The first part of this dissertation seeks to find a cost-effective and reliable tool to monitor the quality loss and implementation of the least shelf life first-out inventory management policy in food banks. Application of the Gompertz model and Arrhenius equation based on time-temperature data …

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Gas-Diffusivity Based Characterization Of Aggregated Agricultural Soils, J.R.R.N. Jayarathne, T.K.K. Chamindu Deepagoda, Timothy J. Clough, M.C.M. Nasvi, Steve Thomas, Bo Elberling, Kathleen Smits Feb 2020

Gas-Diffusivity Based Characterization Of Aggregated Agricultural Soils, J.R.R.N. Jayarathne, T.K.K. Chamindu Deepagoda, Timothy J. Clough, M.C.M. Nasvi, Steve Thomas, Bo Elberling, Kathleen Smits

Civil Engineering Faculty Publications - Archive

Grazed pastures and cultivated fields are significant sources of greenhouse gas (GHG) emissions, in particular N2O emissions derived from fertilizer deposition and animal excreta. Net surface emissions rely on subsurface gas transfer controlled mainly by diffusion, expressed as the soil-gas diffusivity (Dp/Do). The value of Dp/Do is a function of soil air-filled porosity (e) and gaseous phase tortuosity (T), both of which vary with soil physical properties including soil texture and structure. Agricultural soils are often structurally aggregated and characterized by two distinct regions (inter- and intra-aggregated pores), however, such soils are subjected to frequent compaction and tillage resulting in …

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Wart Treatment Decision Support Using Support Vector Machine, Md. Mamunur Rahman, Yuan Zhou, Shouyi Wang, Jamie Rogers Feb 2020

Wart Treatment Decision Support Using Support Vector Machine, Md. Mamunur Rahman, Yuan Zhou, Shouyi Wang, Jamie Rogers

Industrial, Manufacturing, and Systems Engineering Student Research - Archive

Warts are noncancerous benign tumors caused by the Human Papilloma Virus (HPV). The success rates of cryotherapy and immunotherapy, two common treatment methods for cutaneous warts, are 44% and 72%, respectively. The treatment methods, therefore, fail to cure a significant percentage of the patients. This study aims to develop a reliable machine learning model to accurately predict the success of immunotherapy and cryotherapy for individual patients based on their demographic and clinical characteristics. We employed support vector machine (SVM) classifier utilizing a dataset of 180 patients who were suffering from various types of warts and received treatment either by immunotherapy …

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Nanoparticle-Mediated Controlled Myocardial Drug Delivery: A New Treatment For Hypertrophic Cardiomyopathy, Michelle Katherine Mcgrath Copeland Jan 2020

Nanoparticle-Mediated Controlled Myocardial Drug Delivery: A New Treatment For Hypertrophic Cardiomyopathy, Michelle Katherine Mcgrath Copeland

Bioengineering Dissertations - Archive

Hypertrophic cardiomyopathy (HCM) is a genetic disease of the sarcomere, resulting in overgrowth of the septum that separates the left and right ventricles. HCM can affect as many as 1/200 people, making it the most common genetic cardiomyopathy in the general population, as well as the most common cause of sudden cardiac death (SCD). In severe HCM cases, cardiothoracic surgeons perform septal myectomy to remove the excess tissue. However, many patients are poor surgical candidates and require another, less invasive treatment option. In these cases, alcohol septal ablation (ASA) is performed. With ASA, cardiologists deliver pure alcohol through a catheter …

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Mcnair Scholars Research Journal 2020, Michelle X. Bui, Chris Mcdaniels, Jacqueline Bazea-Rubio, Curtis Kizer-Pugh, Eman Alasadi, Ahmed Gure, Helen Hernandez, Archit Jaiswal, Dallas Johnson, Ephrem Kejela, Heather Lake, Charlene Mandimutsira, Paola A. Puentes, Anthony Sajik Ruiz, Richard D. Schargel, Thao-My Tran, Omar Yanouri Jan 2020

Mcnair Scholars Research Journal 2020, Michelle X. Bui, Chris Mcdaniels, Jacqueline Bazea-Rubio, Curtis Kizer-Pugh, Eman Alasadi, Ahmed Gure, Helen Hernandez, Archit Jaiswal, Dallas Johnson, Ephrem Kejela, Heather Lake, Charlene Mandimutsira, Paola A. Puentes, Anthony Sajik Ruiz, Richard D. Schargel, Thao-My Tran, Omar Yanouri

McNair Scholars Research Journal-Archive

No abstract provided.

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Performance Enhancement And Prediction Of Composite Materials With Embedded Electrospun Piezoelectric Sensors, Rahman Jani Mazed, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Md Riaz Uddin Ahmed, Rassel Raihan, Kenneth Reifsnider Jan 2020

Performance Enhancement And Prediction Of Composite Materials With Embedded Electrospun Piezoelectric Sensors, Rahman Jani Mazed, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Md Riaz Uddin Ahmed, Rassel Raihan, Kenneth Reifsnider

Institute of Predictive Performance Methodologies (IPPM-UTARI)-Archive

In today’s world, continuous fiber reinforced composite materials are extensively used in the aerospace, automotive and other structural industries. Since the applications of such fibers demand for a high safety rating, it is of utmost importance for engineers who design such materials to analyze its safety. When cracks are developed in such materials, the mechanical, electrical, and thermal properties also get altered as a function of the cracks. Previous studies have shown that changes in electrical properties can be directly correlated with the development of cracks in the material which can then be used to predict the remaining life of …

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Kernels And Beyond For Data Similarity Learning In Data Mining, Akshay Malhotra Dec 2019

Kernels And Beyond For Data Similarity Learning In Data Mining, Akshay Malhotra

Electrical Engineering Dissertations - Archive

This work discusses the problem of unsupervised clustering of signals/data vectors based on their information content. A correlation based perspective to the clustering problem has been considered, thus relying on the high correlation between data vectors from the same class rather than on the position of the vectors in the data space. In the past, correlation based clustering has been formulated using a canonical correlation framework or as a matrix factorization problem and has been solved with different variants of gradient descent. This work focuses on improving the clustering performance by modifying the framework to utilize non-linear associations or correlations. …

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Identification And Characterization Of Gate Oxide Defects Responsible For Low Frequency Noise In Mosfets, A. S. M. Shamsur Rouf Dec 2019

Identification And Characterization Of Gate Oxide Defects Responsible For Low Frequency Noise In Mosfets, A. S. M. Shamsur Rouf

Electrical Engineering Dissertations - Archive

The main objective of this work is to identify and characterize gate oxide defects that are present in submicron p-channel metal oxide semiconductor field effect transistors (pMOSFETs) and which are responsible for random telegraph signals (RTS). With the downscaling of MOSFETs, alternating capture and emission of channel carriers by defects residing at the oxide-semiconductor interface and bulk oxide have become a pronounced problem. Even though RTS has been used for several years as a tool to characterize the interface/bulk defects, RTS in pMOSFETs has been under-reported compared to that in nMOSFETs, resulting in less information on hole defects in pMOSFETs …

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Pulsed Detonation Engine Nozzle Design And Analysis, Rahul Kumar Dec 2019

Pulsed Detonation Engine Nozzle Design And Analysis, Rahul Kumar

Mechanical and Aerospace Engineering Dissertations - Archive

For a hypersonic flight mission, different flight regimes have been recognized. The successful and efficient operation of the aircraft to traverse through all the flight regimes requires the integration of various propulsion cycles into a single flow path. Using the phenomenon of detonation initiation and propagation, a multi-mode detonation based propulsion concept was proposed for hypersonic flight. Of the different modes proposed, it was recognized that the efficient operation of Normal Detonation Wave Engine (NDWE) mode and Oblique Detonation Wave Engine (ODWE) mode played an important role as they delivered thrust at critical parts of the trajectory. For this study, …

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Improving Compressive Strength Of High Modulus Carbon-Fiber Reinforced Polymeric Composite With Varying Modulus Fibers, Sarvenaz Ghaffari Dec 2019

Improving Compressive Strength Of High Modulus Carbon-Fiber Reinforced Polymeric Composite With Varying Modulus Fibers, Sarvenaz Ghaffari

Mechanical and Aerospace Engineering Dissertations - Archive

There has been a strong demand in using high-modulus (HM) carbon-fiber composites potentially enabling lightweight aircraft structures with significant weight savings. However, extremely low fiber-direction compressive strength has been a well-recognized weakness of the HM composites, preventing their implementation in aircraft platforms. Fiber-direction compressive strength of HM and intermediate-modulus (IM) carbon fiber-reinforced polymers (CFRP’s) is presumably governed by microstructural stability. However, strong decrease in fiber-direction compressive strength of HM carbon-fiber composites, compared to their intermediate modulus (IM) counterparts, contradicts predictions from available microstructural buckling theories. A recent work demonstrated that significant improvement in the fiber-direction compressive strength of HM carbon-fiber …

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Numerical Study Of Detonation Flame Arrestor Performance And Detonation Interaction With The Arrestor Element, Hoden Ali Farah Dec 2019

Numerical Study Of Detonation Flame Arrestor Performance And Detonation Interaction With The Arrestor Element, Hoden Ali Farah

Mechanical and Aerospace Engineering Dissertations - Archive

A numerical study of detonation propagation and interaction with a flame arrestor product in a combustible gas/vapor transport pipeline system is conducted. The flame arrestor element is modeled as a porous medium using the Forchheimer equation, which is incorporated in the governing conservation equations as a momentum sink. The Forchheimer porous medium model is then used to model the flow through a representative four-inch detonation flame arrestor and is validated with experimental data. The detonation propagation simulation is modeled with the Reynolds averaged Navier-Stokes (RANS) equations extended for reacting flow. A 21-step chemical kinetic mechanism with 10 species is used …

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Numerical Study Of High–Frequency Fluidic Valve Injectors For Detonation Engine Applications, Sushma Yalavarthi Dec 2019

Numerical Study Of High–Frequency Fluidic Valve Injectors For Detonation Engine Applications, Sushma Yalavarthi

Mechanical and Aerospace Engineering Dissertations - Archive

The feasibility of fluidic valves for use in detonation-based engines was studied numerically. The fluidic valve acted by shutting off reactant flow through the high pressure behind detonation waves propagating past the valve opening. The valve which featured a plenum cavity was mounted to the side of a pulsed detonation engine, an arrangement that allowed the valve to be characterized under a sustained operation. A series of different cavity lengths were studied. Further, a numerical study of the high-frequency fluidic valve was conducted by using a two-dimensional reactive Euler solver. A 19–step elementary mechanism was employed for the stoichiometric oxyhydrogen …

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Dynamics Of A Pulse Detonation Engine Driven Linear Power Generator, Umang Umeshkumar Dighe Dec 2019

Dynamics Of A Pulse Detonation Engine Driven Linear Power Generator, Umang Umeshkumar Dighe

Mechanical and Aerospace Engineering Dissertations - Archive

The dynamics of a pulse detonation engine driven linear power generator were studied. For an ideal pulse detonation engine, the thrust generated is in the form of a piecewise function given by the Endo-Fujiwara model. Nonlinear electromagnetic damping is also introduced in the system due to the rare earth permanent magnets present in the linear generator architecture. Various linear generator topologies were studied using static magnetic analysis. Two configurations of a single degree-of-freedom oscillator system, one with a linear spring restoring force and another with geometric nonlinear spring restoring force, were investigated to study any potential advantages of using nonlinear …

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