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Dissertations / Theses on the topic 'Commercial aerospace'
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Wismayer, Simon. "Microstructural and textural characterisation of commercial aluminium-lithium aerospace alloys." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315568.
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Govande, Prajakta. "A CONCEPTUAL DESIGN STUDY OF A COMMERCIAL HYPERSONIC AIR TRANSPORT." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1607540130590273.
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Tajima, Michael (Michael Ken). "Framework for the selection of acquisition targets applied in the commercial aerospace industry." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/69215.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; in conjunction with the Leaders for Global Operations Program at MIT, 2010.Title-page reads "Master of Science in Management."-- Student received an M.B.A per June 2010 Degree List, Office of the Registrar, MIT. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 87-89).
Acquisitions are costly, even the ones that never happen. They require a significant commitment of resources involving multi-disciplinary teams examining all aspects of a business. This can come at a significant cost if either the acquisition does not produce the value that was originally expected or if the acquisition process is aborted all together. Clearly, it is critical to be confident in the initial selection, when investing capital and resources to carry out the lengthy investigation process. However, while there is exhaustive research on the detailed evaluation of a target, there is very little published about the preliminary selection process. In this thesis, we demonstrate a methodology for acquisition target selection. We propose a method of metric-based ranking of targets for criteria defined in 3 dimensions. The first is a measure of how a target meets the Strategic Goals of the acquiring company. This is critical not only to measure a target, but to clarify and create alignment among the leadership of the company for the purpose of the acquisition. The second dimension is a measure of Acquisition Fit. This represents a rough measure of likelihood of integration success of a target. The metrics in this dimension are based on research into attributes of acquisition failures. The final dimension is a Financial Impact measure, which represents a rough business case for the acquisition. In the second half of this thesis, we introduce a case study of this methodology being applied in the large commercial aircraft (LCA) industry at Spirit AeroSystems, Inc. This case study demonstrates the application of this methodology with the necessary industry analysis, internal and external technology evaluation and implementation challenges. During this case study, the LCA industry is undergoing a period of technological disruption and re-distribution of engineering responsibilities. These shifts in the industry structure require additional rigor in evaluation of technological and engineering needs and capabilities. Experience is statistically a strong indicator of success in M&A. We hope to lower the learning curve costs and associated risk by capturing research of best practices in a manageable process for M&A target selection.
by Michael Tajima.
M.B.A.
S.M.
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McAfee, Andrew Paul. "On the appropriate level of automation for advanced structural composites manufacturing for commercial aerospace applications." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14133.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990 and, Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1990.Title as it appears in the M.I.T. Graduate List, June, 1990: The appropriate level of automation for advanced structural composites manufacturing for commercial aerospace applications.
Includes bibliographical references (leaves 181-185).
by Andrew Paul McAfee.
M.S.
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Henry, Dilys M. "The nature and effects of hydrogen in weldalite aerospace alloy and other commercial aluminium-lithium alloys." Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340935.
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Patneaude, Steven M. "Transforming commercial aerospace supply chain management practices by utilizing Toyota production system principles, practices, and methodologies." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43112.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2008.Includes bibliographical references (leaves 132-133).
This thesis examines The Toyota Motor Corporation's core precepts, management principles, supply chain architecture, product development methods, leveraged practice of supplier partnerships and procurement practices, all of which are integral elements associated with the Toyota Production System, and assesses the scalability these elements for application in the commercial aerospace industry.The methodology used in this study includes an examination of basic concepts and practices that Toyota employs throughout its extended enterprise and which are being widely adopted throughout the automotive industry as well as other industries worldwide, based on a review of the open literature. The research also draws upon the author's first-hand exposure to Toyota's production system through field research involving benchmarking site-visits to Toyota plants, and makes use of extensive interviews conducted with both automotive and aerospace industry experts.The research reported in this thesis reveals that Toyota's Production System, as a mutually reinforcing set of principles, methods and practices, are indeed scalable to the aerospace industry and that one of the two commercial aerospace behemoths, Boeing and Airbus, has an opportunity to leverage them in order to obtain a clear and sustainable competitive advantage in the industry. This is possible, however, with an important caveat: the end-to-end enterprise transformation process would need to be based on adopting a long-term approach to renovating the current system, working closely with the supply chain partners, owning the change process, and holding steady over the longer-haul.
by Steven M. Patneaude.
S.M.
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Beneke, Jeremy Michael. "Small diameter particle dispersion in a commercial aircraft cabin." Thesis, Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/4150.
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Vora, Jay Abhilash. "Blended Wing Design Considerations for A Next Generation Commercial Aircraft." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1557920109832295.
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Perrino, Michael. "An Experimental Study into Pylon, Wing, and Flap Installation Effects on Jet Noise Generated by Commercial Aircraft." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406819764.
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Parrilla, Javier A. "Hybrid Environmental Control System Integrated Modeling Trade Study Analysis for Commercial Aviation." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1396454368.
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Tiffin, Daniel Joseph. "Orbital Fueling Architectures Leveraging Commercial Launch Vehicles for More Affordable Human Exploration." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1575590285930015.
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Carneiro, Duarte Maria Filipe. "Equity research - Airbus SE." Master's thesis, Instituto Superior de Economia e Gestão, 2020. http://hdl.handle.net/10400.5/20702.
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Mestrado em FinançasO seguinte Relatório de Equity Research da Airbus foi escrito em conformidade com o formato recomendado pelo Instituto CFA, e reflecte a informação pública da empresa publicada até 30 de Junho de 2020. O projecto começa com uma descrição empresarial da empresa, incluindo uma introdução à sua história, uma análise detalhada a cada segmento operacional, e as estratégias concebidas para o futuro. Além disso, o ESG é também destacado no presente relatório. Além disso, uma análise aprofundada da Indústria menciona as tendências A&D, as perspectivas económicas, o modelo PESTEL, e os motores da oferta e da procura da Indústria. O Posicionamento Competitivo é também fornecido, através da análise SWOT. O Preço Alvo de 74,81 euros para 30 de Junho de 2021, equivalente a um potencial de +17,80% de aumento em relação ao preço fechado em 30 de Junho de 2020 (63,52 euros) foi calculado através do modelo DCF, utilizando o Fluxo de Caixa Livre para a Empresa (FCFF). Foram utilizados outros métodos de avaliação, incluindo o Modelo de Desconto Dividido, o Valor Presente Ajustado, o FCFE, a Avaliação Relativa através de múltiplos de pares. Foi realizada uma simulação de Monte Carlo. O relatório inclui a análise de sensibilidade a alguns riscos seleccionados para o preço-alvo, nomeadamente as taxas de produção de aeronaves comerciais, o custo médio ponderado do capital (WACC) e a taxa de crescimento do terminal (g). Traduzido com a versão gratuita do tradutor - www.DeepL.com/Translator
The following Equity Research Report on Airbus was written in line with the research report format recommended by the CFA Institute, and it reflects the public information of the company published until 30th June 2020. The project starts with a business description of the Company, including an introduction to its history, a detailed analysis to each operational segment, and the strategies designed for the future. In addition, ESG is also highlighted in the present report. Moreover, an In-depth Industry analysis mentions the A&D trends, the economic outlook, the PESTEL model, and the supply and demand drivers of the Industry. The Competitive Positioning is also provided, through the SWOT analysis. The Price Target of €74.81 for 30th June 2021, equivalent to a +17.80% upside potential from the close price on 30th June 2020 (€63.52) was computed through the DCF model, using the Free Cash Flow to Firm (FCFF). Other valuation methods were used, including the Dividend-Discount Model, the Adjusted Present Value, the FCFE, the Relative Valuation through Peers' multiples. A Monte Carlo Simulation was performed. The report includes sensitivity analysis to a few selected risks to the price target, namely the Commercial Aircraft production rates, the weighted average cost of capital (WACC) and the terminal growth rate (g).
info:eu-repo/semantics/publishedVersion
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White, Christopher M. "Aspects of multi-walled carbon nanotubes in commercially viable, static dissipative aerospace coatings." Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/811044/.
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This thesis reports the development of a commercially viable, static dissipative,aerospace matt black polyurethane coating. A sheet resistance of 10 k/sq wasachieved with a loading level of 1.0 wt. % MWNTs, with electrical percolation atapproximately 0.3 wt. %.The characterisation of MWNTs available in commercially quantities above 1 kgis presented with key differences in agglomerate structure identified by scanningelectron microscopy (SEM) related to the synthesis method and the catalyst andcatalyst support used as identified energy dispersive X-ray spectroscopy (EDX). Atightening of the MWNT agglomerates after post processing such as purification,functionalisation and shortening is shown by SEM and confirmed using gas adsorp-tion and pore size distributions (PSDs).A scalable dispersion method based on probe sonication used to create 500 ml batchdispersions of MWNTs in organic solvents currently used in the coatings industryusing commercial high molecular weight dispersants. The required loading level wasdetermined using a stability check and related back to the specific surface area (SSA)obtained using the Brunauer–Emmett–Teller (BET) method. Changes in rheologyof the dispersions during sonication are related to the dispersion process using SEM.The compatibility of the MWNT dispersions when mixed with a commercial coatingresin are presented, and the onset of thixotropic behaviour, used to identify therheological percolation loading level. Standard coating tests confirmed the dry film properties of the coating are not ad-versely affected by the inclusion of the MWNT dispersions. It is shown that MWNTflocculation formed during mixing is broken during spray application but that floccu-lation also occurs during coating curing; un-pigmented systems being more severelyaffected than pigmented systems and higher curing temperatures and shorter timesbetween application and curing limiting the increase in sheet resistance.
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Bolduc, Mathieu. "Deposition of Commercially Pure Titanium Powder Using Low Pressure Cold Spray and Pulsed Gas Dynamic Spray for Aerospace Repairs." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24249.
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The objective of this study is to investigate the feasibility of depositing 1.5 mm thick titanium coatings, as a repair method for aerospace Ti-6Al-4V substrates, using two new commercially available processes: Low Pressure Cold Spray (LPCS) and Pulsed Gas Dynamic Spray (PGDS). The coatings produced were examined and characterized by their porosity level, microhardness, adhesion strength, particle flattening ratio, wipe tests, fracture surface type and wear tests. Phases and chemical composition were determined using X-Ray diffraction analysis and energy dispersive spectroscopy, respectively. It was found that both spraying processes are capable of producing dense, hard and oxide-free coatings using specific parameters. Finally, as a first step towards repair implementation of these processes, damages were simulated on Ti-6Al-4V samples, which were successfully repaired with low porosity and high hardness levels. The feasibility of repairs was confirmed, the next step will consist in qualification testing to assess coating performances under real life application.
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Nordlund, Frédéric. "Le régime juridique des activités industrielles et commerciales conduites dans l'espace extra-atmosphérique : nouvelles orientations." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59581.
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Current technology and the planning of ambitious programs for the next decade tend to transform the stakes inherent in space activities. In effect, the launching of space stations and platforms pave the way towards new industrial prospects previously unheard of to date. Thus, the objective of this thesis is to present an outline of these new prospects and to undertake a legal analysis motivating the transition from basic research to commercial applications.Consequently, the preliminary chapter will describe the general characteristics of those future trends towards commercial and industrial space activities. Legal provisions of Public International Space law are examined in the first chapter, notably those which are indicative of the difficulties encountered in this process.
A second chapter will conduct the study of the questions regarding Registration, Jurisdiction and Choice of Law which hopefully lead to a successful regulation of Outer Space activities. The US/International Space Station project will provide an example which will underline the deficiencies and ambiguities of the applicable law.
Finally, the development of a legal framework favouring the commercial viability of these future commercial production processes will be produced in the third chapter.
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Wolford, Ian Mark. "Quantifying Amorphous Content of Commercially Available Silicon Carbide Fibers." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1472054006.
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Caetano, Pedro Nuno Pinho. "AEROSPACE MEDICAL CENTER - AMC Commercial Space Tourism Business Model - Health Factors." Dissertação, 2019. https://hdl.handle.net/10216/124241.
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Caetano, Pedro Nuno Pinho. "AEROSPACE MEDICAL CENTER - AMC Commercial Space Tourism Business Model - Health Factors." Master's thesis, 2019. https://hdl.handle.net/10216/124241.
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Gailey, Jr John Bruce. "Implementation of the Acoustic Rapid Commercial-Off-The-Shelf Insertion Development Model in the P-3C Acoustic System." 2007. http://trace.tennessee.edu/utk_gradthes/283.
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The P-3C is a U.S. Navy aircraft designed for the Maritime Patrol and Reconnaissance mission. Although capable in a number of mission areas, the aircraft’s Anti-Submarine Warfare capabilities have received much attention lately due to improvements in diesel submarine technology. The acoustic systems on the P-3C needed a better way to more rapidly incorporate new technology while working within a constrained budget environment.
The purpose of this study is to show how the P-3C Acoustic System can be transformed by shifting from the slow, expensive traditional Military Specification (MILSPEC) development process to the successful Acoustic Rapid Commercial-Off-The-Shelf (COTS) Insertion (ARCI) process developed for the submarine community. This paper, authored by the Deputy Program Manager for P-3C Acoustic Systems, describes the requirements of the airborne ASW mission and provide the history and architecture of the current acoustic system. It then shows how the constraints of the Department of Defense Acquisition policies present challenges to the incorporation of the latest COTS components, and outline the advantages and disadvantages of using these components.
Using the submarine ARCI Program framework, this paper shows that an Air ARCI program can be made to work with the P-3C acoustic system through the use of Abbreviated Acquisition Programs and periodic technological refreshes to the system. These periodic updates using less expensive COTS components will be combined with an open architecture to ease the incorporation of new software and hardware from across all platforms. This will allow the system to remain up to date while significantly reducing development costs, weight, power, volume, and cooling requirements.
There are risks inherent in using COTS components that must be managed through the use of comprehensive system-level testing, adherence to schedule and a stabilized funding stream. There must also be a plan in place to manage component End of Life issues and the effects of vendor-initiated hardware revisions. Finally, given the heavy operational use of the aircraft around the world, the use of test assets and Fleet aircraft installations must be balanced with operational needs to provide the best combination of technological currency, cost, configuration management, and supportability and spares reduction.
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Ludwig, Christopher George. "Flight Test and Evaluation of a Low-Cost, Compact, and Reconfigurable Airborne Data Acquisition System Based on Commercial Off-The-Shelf Hardware." 2009. http://trace.tennessee.edu/utk_gradthes/49.
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Digitization of physical parameters for the display and recording by computers is the essential aspect of any airborne data acquisition system. The objective of this thesis was to develop a data acquisition system for General Aviation research and certification flight testing based on a low-cost Commercial Off-The- Shelf (COTS) hardware, in particular, a common glass cockpit system for experimental aircraft. A kneeboard computer was used to monitor data communications between the various devices of the Grand Rapids Technology (GRT) Electronic Flight Information System (EFIS). The monitored data was then displayed for use in-flight, and recorded aboard the aircraft for post-flight data reduction. The developed system and software was tested in simulation on virtual and actual hardware, on an Extra 300 in ground testing, and in flight. An in flight air-data calibration and several common stability and control certification test points were flown to evaluate and demonstrate the usefulness of the system. Special consideration was paid to work flow prior to, during, and after the flight with the overall goal of reducing the time required for data reduction. The output of this research work includes software for decoding data files logged on one common low-cost EFIS, software for monitoring, displaying, and recording EFIS data on a kneeboard computer in-flight, and tools for managing and viewing data files after the flight. From this research work, it is concluded that commercially available EFIS systems do in fact provide a core data set which is useful in flight research and flight test certification programs. The 15 Hz sampling rate of the GRT system was more than sufficient for all the test points evaluated as a part of this research. The cost of the tested hardware was less than $10,000 at current pricing (2009). The resultant system is compact, adds little weight to a test aircraft, has few interfaces to aircraft systems, and allows for future growth and the incorporation of new sensor types and interfaces. The addition of a flight test air-data boom with angle of attack and sideslip vanes and control position and force sensors would create a very complete data acquisition package without the expense of purpose designed hardware.
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Barrett, Betty, Joel Cutcher-Gershenfeld, and Rocco Paduano. "Employing Activity Based Costing and Management Practices within the Aerospace Industry: Sustaining the Drive for Lean. Boeing Commercial Airplane Group, Wichita Division/IAM, Wichita, Kansas, 1999 and 2000." 2001. http://hdl.handle.net/1721.1/1595.
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ABCM is an accounting tool that can help companies recognize true costs and make critical choices. ABCM is designed to help firms shift their priorities from individual products to the overall manufacturing environment. BCAG is the world's largest manufacturer of commercial airplanes. It is crucial to move the corporate financial department from account role to that of business partner. The ABCM model organizes activities in terms of their relationship to final cost objects. Looking at two pilot studies, this case study shows the benefits that can be reaped from ABCM implementation. The IAM has supported the adoption of ABCM as a way to get at the true costs of production. There is caution, however, that ABCM is not a panacea.
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"企业所有制属性、组织认同度与员工创新能力研究 —基于航天产业视角." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.53543.
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abstract: 航天产业属于技术密集型行业，现阶段中国航天的发展需要巨额资金和科研人力资本。传统航天企业内员工相较商业航天企业缺乏创新精神，“搭便车”现象严重，缺乏以创新为内在增长动力的传统航天产业，其发展持续性终究得不到满足。相比而言，国内外的商业航天企业却展现出较强的创新能力。遗憾的是，虽然航天产业的高科技属性决定了科研人员的关键角色，但目前的研究几乎没有系统地研究过不同的体制对航天产业创新的影响机制，而有限的研究也集中在讨论宏观环境对行业创新的影响。本研究将弥补这方面研究的不足，分析传统航天模式与新兴商业航天模式下科研人员创新力差别的内在动因，力求给传统航天产业的发展提供有实际意义的参考和建议。
作者自2008年加入传统航天院所从事科研工作，2014年创立中国第一家商业卫星公司，在实践中充分利用面试知识型员工的机会，并深入访谈了不同职级的科研人员，覆盖了30家商业航天公司（截至2016年上市公司54家），包括来自中国传统航天的科研院所、直属航天企业及新兴商业航天公司300余人。通过多次沟通、邮件往来等方式进一步调查研究，发现不同所有制公司的员工在组织认同度方面存在较为明显的差异。为了系统科学地理解组织认同度在航天行业内如何影响不同体制下的科研人员的创新，本研究采用问卷调查的形式收集了1200份问卷，研究在传统航天及商业航天这两种不同所有制的航天企业中，组织认同度与科研人员创新能力的关系。从实证结果来看，航天产业员工组织认同度会显著影响员工的创新绩效，组织认同度越高的员工其创新能力往往更强，员工创新绩效越高。与此同时，通过进一步研究分析发现，航天产业公司所有权属性的差异在组织认同影响员工创新能力的过程中起着调节作用。具体而言，传统航天企业中的员工，其组织认同度对其员工创新能力影响更小，商业航天公司员工创新能力受到其组织认同度的影响相对较大。
研究结果从某种程度上反映了航天领域不同所有权属性企业所具有的不同的组织文化、组织价值观与组织结构会导致其员工个体组织认同度对其创新行为的影响产生差异。从组织文化的角度出发，商业航天企业其组织文化相对于传统航天企业而言更加自由，对员工创意、创新行为限制更少，这种自由的文化刺激并提高了员工的组织认同度，使得个体创新行为的效果更加显著。另外，从组织价值观的角度而言，商业航天企业员工相对于传统航天企业员工来讲更加看重创新行为的意义，其对员工创新行为的重视使其员工组织认同度对员工取得创新绩效产生了催化作用。最后，从组织结构的角度来看，商业航天企业其管理层相对而言往往更愿意接受企业中员工的创意与创新行为，给员工留下了相当大的创新空间，这种灵活的管理方式从某种程度上也会促进组织认同度对员工创新行为产生影响。Dissertation/Thesis
Doctoral Dissertation Business Administration 2019
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Davis, Chad Lee. "A Feasibility Study for Using Commercial Off The Shelf (COTS) Hardware for Meeting NASA’s Need for a Commercial Orbital Transportation Services (COTS) to the International Space Station - [COTS]2." 2011. http://trace.tennessee.edu/utk_gradthes/965.
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The space vehicle system concept (i.e. resupply vehicle) described is based on the new direction that President George W. Bush announced on January 14, 2004 for NASA’s Human Exploration, which has the space shuttle retiring in 2011 following the completion of the International Space Station (ISS). This leads to a problem for the ISS community regarding the capability of meeting a sixty metric-ton cargo shortfall in resupply and the ability of returning large payloads, experiment racks and any other items too large to fit into a crew only type spacecraft like the Orion or Soyuz. NASA and the ISS partners have realized these future problems and started developing various systems for resupply to ISS, but none offer the capability for large up or down mass close to that of the shuttle. Without this capability, the primary purpose behind the ISS science mission is defeated and the ability to keep the station functioning properly is at risk with limited payload delivery (i.e. replacement hardware size and mass). There is a solution to this problem and a majority of the solution has already been designed, built, and flight tested. Another portion has been studied heavily by a team at NASA for use in a slightly different mission. Following the retirement of the space shuttle fleet and the loss of heavy up and down mass capability, the only solution to the problem is to design a new spacecraft. However, the budget and new direction for NASA will not allow for a costly new payload carrying spacecraft. The solution is to use existing commercial off the shelf (COTS) hardware to minimize the costs of developing a totally new system. This paper will discuss the technical feasibility of this conceptual configuration.
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"Comparison of Commercial Aircraft Fuel Requirements in Regards to FAR, Flight Profile Simulation, and Flight Operational Techniques." Master's thesis, 2014. http://hdl.handle.net/2286/R.I.25088.
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abstract: There are significant fuel consumption consequences for non-optimal flight operations. This study is intended to analyze and highlight areas of interest that affect fuel consumption in typical flight operations. By gathering information from actual flight operators (pilots, dispatch, performance engineers, and air traffic controllers), real performance issues can be addressed and analyzed. A series of interviews were performed with various individuals in the industry and organizations. The wide range of insight directed this study to focus on FAA regulations, airline policy, the ATC system, weather, and flight planning. The goal is to highlight where operational performance differs from design intent in order to better connect optimization with actual flight operations. After further investigation and consensus from the experienced participants, the FAA regulations do not need any serious attention until newer technologies and capabilities are implemented. The ATC system is severely out of date and is one of the largest limiting factors in current flight operations. Although participants are pessimistic about its timely implementation, the FAA's NextGen program for a future National Airspace System should help improve the efficiency of flight operations. This includes situational awareness, weather monitoring, communication, information management, optimized routing, and cleaner flight profiles like Required Navigation Performance (RNP) and Continuous Descent Approach (CDA). Working off the interview results, trade-studies were performed using an in-house flight profile simulation of a Boeing 737-300, integrating NASA legacy codes EDET and NPSS with a custom written mission performance and point-performance "Skymap" calculator. From these trade-studies, it was found that certain flight conditions affect flight operations more than others. With weather, traffic, and unforeseeable risks, flight planning is still limited by its high level of precaution. From this study, it is recommended that air carriers increase focus on defining policies like load scheduling, CG management, reduction in zero fuel weight, inclusion of performance measurement systems, and adapting to the regulations to best optimize the spirit of the requirement.. As well, air carriers should create a larger drive to implement the FAA's NextGen system and move the industry into the future.Dissertation/Thesis
M.S. Aerospace Engineering 2014
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(9607445), Casey M. Jones. "Determining the Effects of Non-Catastrophic Nail Puncture on the Operational Performance and Service Life of Small Soft Case Commercial Li-ion Prismatic Cells." Thesis, 2020.
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This work developed a novel experiment in order to determine the operational effects on a Lithium-ion battery (LIB) when a test resulting in non-catastrophic damage is performed. Accepted industry standards were used as a basis to develop a nail penetration test that would puncture a cell approximately halfway through during normal cycling at a rate of 1C, then allow the cell to continue cycling to determine how its operation was affected. The cells under test continued cycling after the punctures, showing that the experiment would be able to provide useful information on the topic. The experiment was found to be successful in simulating the operation of a cell in an abusive environment, such as those seen in electric vehicles and aerospace applications.The results of these experiments showed that a sharp increase in temperature is observed immediately after the puncture, similar to cells that underwent tests with full penetrations. The temperatures then slowly decreased during the first few cycles after the puncture as the generated heat was dissipated through convection. The experiments also showed that it is possible for a LIB under test to continue operating for a short time after being punctured. However, the capacity and useful life of the cells were greatly reduced. The initial capacity of each cell decreased by approximately 11% after the initial impact, then continued decreasing at an accelerated rate during the ensuing cycling. The lifetime of the cells was also greatly reduced, with each cell reaching its end of life within approximately 15-75 cycles after the punctures. An analysis of the incremental capacity curves of the cells indicated that accelerated aging occurred due to both a loss of active material and a loss of lithium inventory. The information gained from the experiments gives insight into the operation of cells that experience abusive environments and will be useful in designing improved control systems, as well as promoting the development of more robust testing and safety standards for different types of cells.