Dissertations / Theses on the topic 'Aerospace engineering – Research'
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Fiorenza, Paul R. "Delivering Program Efficiency to Aerospace Testing Using Designed Experiments." Thesis, The George Washington University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10928677.
Full textGiven the increasing complexity of systems and the cost associated with test and evaluation of aerospace systems, more efficient methods are sought. Randomized test designs for aviation developmental test activities and other complex systems may not enable safe test conduct and may be prohibitively costly from a financial or time point of view. This research reviews Design of Experiments (DoE) test design approaches applicable to aerospace prototype test and evaluation activities. It proposes the use of Split Plot Optimal Designs to leverage advantages of DoE while satisfying requirements for limited randomization of the test runs. Through the use of case studies, the Split Plot Optimal Design approach is demonstrated to provide a 58% cost and schedule savings versus a One Factor At a Time approach, and 53% savings from the fully randomized Central Composite Design, while maintaining relevant statistical power. Through the use of Monte Carlo data simulation, the designs are evaluated for application to linear and quadratic models, with statistically significant results measured by Chi Squared and Kolmogorov-Smirnov tests.
Phillips, Kyle G. "Development of the West Virginia University Small Microgravity Research Facility (WVU SMiRF)." Thesis, West Virginia University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1565521.
Full textWest Virginia University (WVU) has created the Small Microgravity Research Facility (SMiRF) drop tower through a WVU Research Corporation Program to Stimulate Competitive Research (PSCoR) grant on its campus to increase direct access to inexpensive and repeatable reduced gravity research. In short, a drop tower is a tall structure from which experimental payloads are dropped, in a controlled environment, and experience reduced gravity or microgravity (i.e. "weightlessness") during free fall. Currently, there are several methods for conducting scientific research in microgravity including drop towers, parabolic flights, sounding rockets, suborbital flights, NanoSats, CubeSats, full-sized satellites, manned orbital flight, and the International Space Station (ISS). However, none of the aforementioned techniques is more inexpensive or has the capability of frequent experimentation repeatability as drop tower research. These advantages are conducive to a wide variety of experiments that can be inexpensively validated, and potentially accredited, through repeated, reliable research that permits frequent experiment modification and re-testing.
Development of the WVU SMiRF, or any drop tower, must take a systems engineering approach that may include the detailed design of several main components, namely: the payload release system, the payload deceleration system, the payload lifting and transfer system, the drop tower structure, and the instrumentation and controls system, as well as a standardized drop tower payload frame for use by those researchers who cannot afford to spend money on a data acquisition system or frame. In addition to detailed technical development, a budgetary model by which development took place is also presented throughout, summarized, and detailed in an appendix. After design and construction of the WVU SMiRF was complete, initial calibration provided performance characteristics at various payload weights, and full-scale checkout via experimentation provided repeatability characteristics of the facility. Based on checkout instrumentation, Initial repeatability results indicated a drop time of 1.26 seconds at an average of 0.06g, with a standard deviation of 0.085g over the period of the drop, and a peak impact load of 28.72g, with a standard deviation of 10.73g, for a payload weight of 113.8 lbs.
In order to thoroughly check out the facility, a full-scale, fully operational experiment was developed to create an experience that provides a comprehensive perspective of the end-user experience to the developer, so as to incorporate the details that may have been overlooked to the designer and/or developer, in this case, Kyle Phillips. The experiment that was chosen was to determine the effects of die swell, or extrudate swell, in reduced gravity. Die swell is a viscoelastic phenomenon that occurs when a dilatant, or shear-thickening substance is forced through a sufficient constriction, or "die," such that the substance expands, or "swells," downstream of the constriction, even while forming and maintaining a free jet at ambient sea level conditions. A wide range of dilatants exhibit die swell when subjected to the correct conditions, ranging from simple substances such as ketchup, oobleck, and shampoo to complex specially-formulated substances to be used for next generation body armor and high performance braking systems. To date, very few, if any, have researched the stabilizing effect that gravity may have on the phenomenon of die swell. By studying a fluid phenomenon in a reduced gravity environment, both the effect of gravity can be studied and the predominant forces acting on the fluid can be concluded. Furthermore, a hypothesis describing the behavior of a viscoelastic fluid particle employing the viscous Navier-Stokes Equations was derived to attempt to push the fluid mechanics community toward further integrating more fluid behavior into a unified mathematical model of fluid mechanics. While inconclusive in this experiment, several suggestions for future research were made in order to further the science behind die swell, and a comprehensive checkout of the facility and its operations were characterized. As a result of this checkout experience, several details were modified or added to the facility in order for the drop tower to be properly operated and provide the optimal user experience, such that open operation of the WVU SMiRF may begin in the Fall of 2014.
Lee, Daniel M. "Development of a 1/7th scale fighter UAV for flight research." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA240703.
Full textThesis Advisor(s): Howard, Richard M. Second Reader: Pagenkopf, Eric L. "September 1990." Description based on title screen as viewed on March 18, 2010. DTIC Identifier(s): Remotely Piloted Vehicles, Flight Maneuvers, Parachute Descents, UAV (Unmanned Air Vehicles), Supermaneuverability, Scale Models, Remote Control, Research Aircraft, Radio Transmission, High Angle of Attack, Aircraft Models, Naval Aircraft, Jet Fighters, Recovery, Theses. Author(s) subject terms:UAV, Supermaneuverability, Emergency Recovery System, Remotely Pioleted Vehicle. Includes bibliographical references (p. 68-70). Also available in print.
Salud, Ellen. "Developing a library of display effects on pilot performance| Methods, meta-analyses, and performance estimates." Thesis, San Jose State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1547139.
Full textThe design of NextGen and current-day cockpit displays are critical for efficient pilot performance and situation awareness on the flight deck. Before deployment of a design into the cockpit the costs and benefits that a display design imposes on performance and situation awareness should be considered. In this thesis, a design tool was developed to support the design of NextGen displays for situation awareness and performance. This design tool is a library of pilot performance estimates. Through literature reviews and meta-analyses of empirical data, the library was developed to provide display designers 1) qualitative distinctions of display properties that either support or limit full situation awareness, and 2) quantitative performance time estimates until situation awareness as a function of various display formats. A systematic method was also developed for future augmentation of the library.
Nordenholm, Jonathan. "Research and Testing of an Electromechanical solution for Vibration Assisted Drilling of Aerospace Materials." Thesis, Uppsala universitet, Solcellsteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415047.
Full textWard, Elizabeth Buchanan. "Campus and consortium in an era of large-scale research: An historical study of the Virginia Associated Research Center, 1962-1967." W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539618488.
Full textHigham, Tiana-Lynn M. "Training trust in automation within a NextGen environment." Thesis, California State University, Long Beach, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1524202.
Full textThe projected increase in air traffic density has led to the development of NextGen that is expected to revolutionize the way the NAS is currently functioning. For NextGen to be implemented successfully, it is important to understand the humanautomation relationship within a complex system. Controllers will have to rely on automated tools to successfully manage aircraft in their sector. Increasing human trust in automation can lead to an increase in automation acceptance and its proper use. However, we are not aware of any research studies that have attempted to directly train individuals to trust automation. We report on an attempt to train 8 novice air traffic controllers to trust the automated NextGen tools in a radar internship course. Although the results were not statistically significant, the trend in the data suggests that it may be possible to train trust in automation.
Mooney, Ryan E. "Guiding “Big Science:” Competing Agency of Scientists and Funding Organizations in American Cold War Research." Youngstown State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1444054145.
Full textThummalapalli, Vimal Kumar. "Biomimetic Composite T-Joints." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1323547304.
Full textJimenez, Andrew Enrique. "Design and Analysis of a Novel Deformed Skin Adhesion for Aircraft Icing." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1619781381968283.
Full textKuruvilla, Mithun. "An Understanding of the Quasi-static Behavior, High Cycle Fatigue and Final Fracture Behavior of a Titanium (Ti- 4 Al-2.5 V-1.5 Fe-0.25 O2) Alloy." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1217436482.
Full textLee, Jin Woo. "Multi-level Decoupled Optimization of Wind Turbine Structures Using Coefficients of Approximating Functions as Design Variables." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501003238831086.
Full textDe, Cino Thomas James. "A Usability and Learnability Case Study of Glass Flight Deck Interfaces and Pilot Interactions through Scenario-based Training." NSUWorks, 2016. http://nsuworks.nova.edu/gscis_etd/948.
Full textZhang, Chao. "Multi-Scale Characterization and Failure Modeling of Carbon/Epoxy Triaxially Braided Composite." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1384174136.
Full textLowas, Albert Frank III. "Improved Spare Part Forecasting for Low Quantity Parts with Low and Increasing Failure Rates." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1432380369.
Full textPescara, Fabrizio. "Augmented Reality Safety Net in Aerodrome Control Tower." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textFullenkamp, 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.
Full textDavis, Larry Michael. "A Condition Assessment Process for Aerospace Ground Test Systems." 2009. http://trace.tennessee.edu/utk_gradthes/522.
Full textPietz, Jesse Allen. "Pseudospectral collocation methods for the direct transcription of optimal control problems." Thesis, 2003. http://hdl.handle.net/1911/17616.
Full textStaal, Remmelt Andrew. "Failure of sandwich honeycomb panels in bending." 2006. http://hdl.handle.net/2292/1906.
Full text"Comparative Qualitative Research Distinguishing Safety Features Among Aviation Safety Action Programs in the United States Airlines." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.40768.
Full textDissertation/Thesis
Masters Thesis Technology 2016
(9029510), Archana Ravindran. "Utility optimal decision making when responding to No Fault Found events." Thesis, 2020.
Find full textNo Fault Founds (NFFs) are an expensive problem faced by the airline industry. The underlying cause of NFFs are a major focus of research work in the field, but the dearth of consistent data is a roadblock faced by many decision makers. An important risk factor identified is the occurrence rate of NFFs.
This research work aims to help decision makers in the Airline Maintenance, Repair and Overhaul teams, when faced with recurring NFFs, to make a choice based on value derived from the system and risk preference of the decision maker under uncertainty. The value of the aircraft fleet is laid out using Net Present Value at every decision point along the system life cycle while accounting for the uncertainty in the failure rate information. Two extreme decisions are considered for the decision maker to choose between: rebooting the system every time a failure occurs and results in an NFF which allows for it to recur while reducing uncertainty of the failure rate; or eliminating the failure mode which assumes that the failure does not recur and therefore completely removes the uncertainty. Both decisions have their associated uncertain costs that affect the NPV calculated. We use a Monte Carlo approach to estimate the expected profit from deciding to eliminate the failure mode. We make use of Expected Utility Theory to account for the risk preference of a decision maker under uncertainty and build an Expected Utility Maximizing decision framework.
To conclude we give some guidance to interpret the results and understand what factors influence the optimal decision. We conclude that not accounting for uncertainty in estimating a failure rate for the future along with uncertainty in NFF costs can lead to an undesirable decision. If the decision maker waits too long to gather more information and reduce uncertainty, then rebooting the system for the remaining life could be more worthwhile than spending the large amount of money to Eliminate a failure mode. Finally, we conclude that, despite uncertainties in information of occurrence rates and costs of NFFs, an Expected Utility maximizing decision between the two options considered – Reboot and Eliminate – is possible given the available information.