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Relevant bibliographies by topics / Engineering|Aerospace engineering|Systems science / Dissertations / Theses

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Dissertations / Theses on the topic 'Engineering|Aerospace engineering|Systems science'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Alstad, James Patrick. "COSYSMO 3.0| An Extended, Unified Cost Estimating Model for Systems Engineering." Thesis, University of Southern California, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10981738.

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<p> The discipline of systems engineering continues to increase in importance. There are more projects, projects are larger, and projects are more critical, and all of these mean that more and better systems engineering is required. It follows that the cost of systems engineering continues to increase in importance. In turn, it follows that accurate estimation of systems engineering costs continues to increase in importance, as systems engineering results suffer if a project either underestimates or overestimates its cost. </p><p> There are models for estimating systems engineering cost, not

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2

Brainard, Samantha Marquart. "The Impact of Government Oversight on Engineering Work| Insights from a Large Aerospace Contractor." Thesis, The George Washington University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10784768.

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<p> Government oversight exists to provide the government with the information it needs to evaluate the cost, schedule, and performance of contractors building systems on the government’s behalf. The activities required for oversight, while necessary, add additional costs to a program. Stakeholders involved in space system acquisitions debate the extent of the added costs from complying with oversight—referred to as the burden of government oversight—with estimates ranging from 2–5% of a program’s total costs to factors of 3-5 times the cost of commercially availa

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3

Peters, Wanda Carter. "An Evaluation of the Relationship Between Critical Technology Developments and Technology Maturity." Thesis, The George Washington University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10619184.

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<p> The research presented in this dissertation investigates the relationship between critical technologies and technology maturity assessments at a key decision point in the product development life cycle. This study utilizes statistical methods for assessing technology maturity at a key decision point. A regression model is established and utilized for predicting the probability of a system achieving technology maturity. The study disclosed with a 95% confidence that there is statistical evidence that utilization of heritage technology developments, as originally designed, significantly incr

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4

Paragano, Matthew Vincent. "Liquid Systems for Carbon Dioxide Removal in Spacecraft Environments." Thesis, Yale University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10783463.

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<p> As humans strive to explore deeper into the solar system, the need for efficient, compact, and reliable life support systems for providing breathable air and drinkable water become critical to mission success. One element of providing breathable air is the removal of metabolic gaseous waste products, primarily consisting of carbon dioxide, from the cabin air. Recent work on human performance has suggested that carbon dioxide has effects on human performance at lower concentrations than previously anticipated and at concentrations lower than presently controlled to on the International Spac

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5

Knox, Lenora A. "Use of Model-Based Design Methods for Enhancing Resiliency Analysis of Unmanned Aerial Vehicles." Thesis, The George Washington University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10265223.

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<p>The most common traditional non-functional requirement analysis is reliability. With systems becoming more complex, networked, and adaptive to environmental uncertainties, system resiliency has recently become the non-functional requirement analysis of choice. Analysis of system resiliency has challenges; which include, defining resilience for domain areas, identifying resilience metrics, determining resilience modeling strategies, and understanding how to best integrate the concepts of risk and reliability into resiliency. Formal methods that integrate all of these concepts do not curre

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6

Holloman, Sherrica S. "Validating the Use of pPerformance Risk Indices for System-Level Risk and Maturity Assessments." Thesis, The George Washington University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10086217.

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<p> With pressure on the U.S. Defense Acquisition System (DAS) to reduce cost overruns and schedule delays, system engineers’ performance is only as good as their tools. Recent literature details a need for 1) objective, analytical risk quantification methodologies over traditional subjective qualitative methods – such as, expert judgment, and 2) mathematically rigorous system-level maturity assessments. The Mahafza, Componation, and Tippett (2005) Technology Performance Risk Index (TPRI) ties the assessment of technical performance to the quantification of risk of unmet performanc

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7

Saranathan, Harish. "Algorithmic Advances to Increase the Fidelity of Conceptual Hypersonic Mission Design." Thesis, Purdue University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10792495.

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<p> The contributions of this dissertation increase the fidelity of conceptual hypersonic mission design through the following innovations: 1) the introduction of coupling between the effects of ablation of the thermal protection system (TPS) and flight dynamics, 2) the introduction of rigid body dynamics into trajectory design, and 3) simplifying the design of hypersonic missions that involve multiple phases of flight. These contributions are combined into a unified conceptual mission design framework, which is in turn applicable to slender hypersonic vehicles with ablative TPS. Such vehicles

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8

Mohleji, Nandita. "Decision Modeling Framework to Minimize Arrival Delays from Ground Delay Programs." Thesis, The George Washington University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3740141.

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<p> Convective weather and other constraints create uncertainty in air transportation, leading to costly delays. A Ground Delay Program (GDP) is a strategy to mitigate these effects. Systematic decision support can increase GDP efficacy, reduce delays, and minimize direct operating costs. In this study, a decision analysis (DA) model is constructed by combining a decision tree and Bayesian belief network. Through a study of three New York region airports, the DA model demonstrates that larger GDP scopes that include more flights in the program, along with longer lead times that provide sta

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9

Umaretiya, Jagdish R. "Specifications extraction and synthesis: Their correlations with preliminary design." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185035.

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This report addresses the research applied towards the automation of the engineering design process, in particular the structural design process. The three important stages of the structural design process are: the specifications, preliminary design and the detailed design. An iterative redesign architecture of the structural design process lends itself to automation. The automation of the structural design can improve both the cost and the reliability, and enhance the productivity of the human designers. To the extent that the assumptions involved in the design process are explicitly represen

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10

Lipkin, Ilya. "Testing Software Development Project Productivity Model." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321593577.

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11

Vyapamakula, Sreeramachandra Sankeerth. "Expedient Modal Decomposition of Massive Datasets Using High Performance Computing Clusters." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu151515633114873.

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12

Leung, Raymond. "The Effect of Mission Assurance on ELV Launch Success Rate| An Analysis of Two Management Systems for Launch Vehicles." Thesis, The George Washington University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3617175.

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<p> There are significant challenges involved in regulating the growing commercial human spaceflight industry. The safety of the crew and passengers should be protected; however, care should be taken not to overburden the industry with too many or too stringent, or perhaps inapplicable, regulations. </p><p> An improvement in launch success would improve the safety of the crew and passengers. This study explores the effectiveness of Mission Assurance policies to guide regulations and standards. There is a severe lack of data regarding commercial human space flights. This means that a direct

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13

Olfati-Saber, Reza. "Nonlinear control of underactuated mechanical systems with application to robotics and aerospace vehicles." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8979.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.<br>Includes bibliographical references (leaves 308-316).<br>This thesis is devoted to nonlinear control, reduction, and classification of underactuated mechanical systems. Underactuated systems are mechanical control systems with fewer controls than the number of configuration variables. Control of underactuated systems is currently an active field of research due to their broad applications in Robotics, Aerospace Vehicles, and Marine Vehicles. The examples of underactuated system

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14

Parrish, Jefferson Carter. "Reduced order techniques for sensitivity analysis and design optimization of aerospace systems." Thesis, Mississippi State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3618312.

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<p> This work proposes a new method for using reduced order models in lieu of high fidelity analysis during the sensitivity analysis step of gradient based design optimization. The method offers a reduction in the computational cost of finite difference based sensitivity analysis in that context. </p><p> The method relies on interpolating reduced order models which are based on proper orthogonal decomposition. The interpolation process is performed using radial basis functions and Grassmann manifold projection. It does not require additional high fidelity analyses to interpolate a reduced or

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15

Shin, Jae Ho 1967. "Applications of a gradient flow algorithm for parameter identification of non-linear systems in continuous-time." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282637.

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An efficient methodology for parameter identification is developed for general multi-degree of freedom linear or nonlinear systems in continuous time. The new methodology is based on a gradient flow algorithm and demonstrated to be useful in identifying unknown parameters for the systems defined by both linear and nonlinear differential equations. The new methodology identifies the unknown parameters by solving a system of differential equations rather than the conventional post-data fitting analysis. It is named the trajectory gradient integral flow (TGIF) algorithm. For the cases of stable,

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16

Mitra, Paromita. "Human Systems Integration of an Extravehicular Activity Space Suit Augmented Reality Display System." Thesis, Mississippi State University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10843754.

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<p> During an extravehicular activity (EVA), the role of an astronaut involves a multitude of complex tasks. Whether that task is a science experiment aboard the International Space Station, or traversing extraterrestrial terrain – attention, communication, and instruction are essential. As an aid, augmented reality (AR) can portray suit informatics and procedures within line-of-sight while minimizing attentional loss. Currently, there exists little research highlighting the human systems considerations to qualify AR systems for space suit applications. This study quantifies user interfa

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17

Kintz, Andrew Lane. "Nullspace MUSIC and Improved Radio Frequency Emitter Geolocation from a Mobile Antenna Array." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1479896813925084.

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18

Subramanian, Rohit. "COMPUTATIONAL FRAMEWORK TO ASSESS ROLE OF MANUFACTURING IN MATERIAL-DEFECT RELATED FAILURE RISK." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398998282.

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19

Tallman, Jake T. "SOARNET, Deep Learning Thermal Detection For Free Flight." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2339.

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Thermals are regions of rising hot air formed on the ground through the warming of the surface by the sun. Thermals are commonly used by birds and glider pilots to extend flight duration, increase cross-country distance, and conserve energy. This kind of powerless flight using natural sources of lift is called soaring. Once a thermal is encountered, the pilot flies in circles to keep within the thermal, so gaining altitude before flying off to the next thermal and towards the destination. A single thermal can net a pilot thousands of feet of elevation gain, however estimating thermal locations

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20

Sims, Zack A. "Deployment, Management, & Operations of Internet Routers for Space-Based Communication." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1429033241.

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21

Fullenkamp, Steven Charles. "The Effect of Cue and Target Similarity on Visual Search Response Times: Manipulation of Basic Stimulus Characteristics." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1388500646.

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22

Huff, John D. "Performance Characteristics of the Interplanetary Overlay Network in 10 Gbps Networks." Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1619115602389023.

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23

Schartel, Andreas. "Increasing Spacecraft Autonomy through Embedded Neural Networks for Semantic Image Analysis." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-61353.

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In the scope of this thesis, a possible usage of embedded artificial neural networks for on-board image analysis is investigated. After an introduction which imparts basic knowledge about artificial neural network and autonomy in spaceflight, a possible system design is elaborated based on previously defined reference scenarios. The reference scenarios are based on two projects that are currently under development at the professorship of Space Technology at the University of Würzburg: ASMET and SONATE. As base for the neural network architecture, a convolutional neural network called SqueezeNe

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24

Leung, Chi Ho. "Necessary and Sufficient Conditions on State Transformations That Preserve the Causal Structure of LTI Dynamical Networks." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7413.

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Linear time-invariant (LTI) dynamic networks are described by their dynamical structure function, and generally, they have many possible state space realizations. This work characterizes the necessary and sufficient conditions on a state transformation that preserves the dynamical structure function, thereby generating the entire set of realizations of a given order for a specific dynamic network.

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25

"Modeling and H-Infinity Loop Shaping Control of a Vertical Takeoff and Landing Drone." Master's thesis, 2018. http://hdl.handle.net/2286/R.I.49175.

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abstract: VTOL drones were designed and built at the beginning of the 20th century for military applications due to easy take-off and landing operations. Many companies like Lockheed, Convair, NASA and Bell Labs built their own aircrafts but only a few from them came in to the market. Usually, flight automation starts from first principles modeling which helps in the controller design and dynamic analysis of the system. In this project, a VTOL drone with a shape similar to a Convair XFY-1 is studied and the primary focus is stabilizing and controlling the flight path of the drone in its hover

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26

"Planetary Geological Science and Aerospace Systems Engineering Applications of Thermal Infrared Remote Sensing for Earth, Mars, and the Outer Bodies." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.50586.

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abstract: Many planetary science missions study thermophysical properties of surfaces using infrared spectrometers and infrared cameras. Thermal inertia is a frequently derived thermophysical property that quantifies the ability for heat to exchange through planetary surfaces. To conceptualize thermal inertia, the diffusion equation analogies are extended using a general effusivity term: the square root of a product of conductivity and capacity terms. A hypothetical thermal inductance was investigated for diurnal planetary heating. The hyperbolic heat diffusion equation was solved to derive a

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27

"Inflatable Parabolic Reflectors for Small Satellite Communication." Master's thesis, 2015. http://hdl.handle.net/2286/R.I.36492.

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abstract: CubeSats offer a compelling pathway towards lowering the cost of interplanetary exploration missions thanks to their low mass and volume. This has been possible due to miniaturization of electronics and sensors and increased efficiency of photovoltaics. Interplanetary communication using radio signals requires large parabolic antennas on the spacecraft and this often exceeds the total volume of CubeSat spacecraft. Mechanical deployable antennas have been proposed that would unfurl to form a large parabolic dish. These antennas much like an umbrella has many mechanical moving parts

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28

"Experimental Investigation of Typical Aircraft Field Performance Versus Predicted Performance Targets." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.45483.

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abstract: This thesis explores the human factors effects pilots have when controlling the aircraft during the takeoff phase of flight. These variables come into play in the transitory phase from ground roll to flight, and in the initiation of procedures to abort a takeoff during the ground run. The FAA provides regulations for manufacturers and operators to follow, ensuring safe manufacture of aircraft and pilots that fly without endangering the passengers; however, details regarding accounting of piloting variability are lacking. Creation of a numerical simulation allowed for the controlle

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29

"A Generalized H-Infinity Mixed Sensitivity Convex Approach to Multivariable Control Design Subject to Simultaneous Output and Input Loop-Breaking Specifications." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.50554.

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abstract: In this dissertation, we present a H-infinity based multivariable control design methodology that can be used to systematically address design specifications at distinct feedback loop-breaking points. It is well understood that for multivariable systems, obtaining good/acceptable closed loop properties at one loop-breaking point does not mean the same at another. This is especially true for multivariable systems that are ill-conditioned (having high condition number and/or relative gain array and/or scaled condition number). We analyze the tradeoffs involved in shaping closed loop pr

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30

"Analysis and Control of Space Systems Dynamics via Floquet Theory, Normal Forms and Center Manifold Reduction." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.55623.

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abstract: It remains unquestionable that space-based technology is an indispensable component of modern daily lives. Success or failure of space missions is largely contingent upon the complex system analysis and design methodologies exerted in converting the initial idea into an elaborate functioning enterprise. It is for this reason that this dissertation seeks to contribute towards the search for simpler, efficacious and more reliable methodologies and tools that accurately model and analyze space systems dynamics. Inopportunely, despite the inimical physical hazards, space systems must en

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31

"Time-varying stability analysis of linear systems with linear matrix inequalities." Thesis, 2010. http://hdl.handle.net/1911/62103.

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Aerospace attitude control systems are often modeled as time-varying linear systems. In industry, these systems are analyzed with linear time-invariant (LTI) methods by treating the system as slowly varying. Stability analysis with parameter dependent Lyapunov functions and linear matrix inequalities (LMIs) enables the consideration of bounds on system parameters' rates of variation while accounting for time-varying behavior. The LMI criteria are adapted to predict robustness in time-varying systems. In a case study, stability envelopes are created for time-varying uncertain parameters in a sp

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32

Klein, Theresa J. "Using reinforcement learning to control advanced life support systems." Thesis, 2005. http://hdl.handle.net/1911/17794.

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This thesis deals with the application of reinforcement learning techniques to the control of a closed life support system simulator, such as could be used on a long duration space mission. We apply reinforcement learning to two different aspects of the simulator, control of recycling subsystems, and control of crop planting schedules. Comparisons are made between distributed and centralized controllers, generalized and non-generalized RL, and between different approaches to the construction of the state table and the design of reward functions. Distributed controllers prove to be superior to

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33

"Multidisciplinary Optimization for the Design and Control of Uncertain Dynamical Systems." Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.24763.

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abstract: This dissertation considers an integrated approach to system design and controller design based on analyzing limits of system performance. Historically, plant design methodologies have not incorporated control relevant considerations. Such an approach could result in a system that might not meet its specifications (or one that requires a complex control architecture to do so). System and controller designers often go through several iterations in order to converge to an acceptable plant and controller design. The focus of this dissertation is on the design and control an air-breathin

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34

Ferreira, Fabiana Nogueira Holanda. "Developing business solutions as a network-focused process: Beyond the 'manufacturer-customer' dyad in complex engineering service systems: An analysis of the evolution of dyadic-triadic relationships in the aerospace industry." Tese, 2016. https://repositorio-aberto.up.pt/handle/10216/84243.

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Ferreira, Fabiana Nogueira Holanda. "Developing business solutions as a network-focused process: Beyond the 'manufacturer-customer' dyad in complex engineering service systems: An analysis of the evolution of dyadic-triadic relationships in the aerospace industry." Doctoral thesis, 2016. https://repositorio-aberto.up.pt/handle/10216/84243.

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36

(11068791), Athul Pradeepkumar Girija. "A Systems Framework and Analysis Tool for Rapid Conceptual Design of Aerocapture Missions." Thesis, 2021.

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Aerocapture offers a near propellantless and quick method of orbit insertion at atmosphere bearing planetary destinations. Compared to conventional propulsive insertion, the primary advantage of using aerocapture is the savings in propellant mass which could be used to accommodate more useful payload. To protect the spacecraft from the aerodynamic heating during the maneuver, the spacecraft must be enclosed in a protective aeroshell or deployable drag device which also provides aerodynamic control authority to target the desired conditions at atmospheric exit. For inner planets such as

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