Дисертації з теми "Aerospace defence"
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Tsolakidis, Stefanos K. "Foresight of aerospace and defence technologies in Greece up to 2020." Thesis, Middlesex University, 2006. http://eprints.mdx.ac.uk/13552/.
Повний текст джерелаАнотація:
Technology Foresight exammes the future of the Greek economy and in particular what the contribution of science and technology is to this. Greek Technology Foresight started in October 2001 as a programme co-financed by the European Union and the target was to create a functional view after two decades. The main purpose of this project is the identification of cost-effective Aerospace and Defence Technologies for Greece in the year 2020. Firstly, the capacity and capability of Greek industries and the research environment are examined in conjunction with the products demanded by Armed Forces. Secondly, comes the examination of all relevant factors (industry, university, government) which have a considerable contribution to research and innovation in order to promote networking and further institutional development. Research was absolutely necessary to foresee and evaluate specific technologies within a frame of long-term development strategy for the various stakeholders. This research area is directly related to my managerial role as I have been in charge of this programme during its implementation. The research methods employed are documentary evidence, interviews and the Delphi approach. Thus the data collected from a variety of sources ensure the qualitative character of the thesis. The main findings are that the outlined Aerospace and Defence technologies can playa decisive role in the three different scenarios for the future of the country and they are related to the outcomes of science and technology evolution. The general conclusion is that taking into consideration Technology Foresight results defence procurement could be managed better which would result an efficient contribution to national economy, an improvement in intra-community transfer and several benefits from export opportunities of dual-use products.
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John, Ryan Nichols. "Impact detection techniques using fibre-optic sensors for aerospace & defence." Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/2970.
Повний текст джерелаАнотація:
Impact detection techniques are developed for application in the aerospace and defence industries. Optical fibre sensors hold great promise for structural health monitoring systems and methods of interrogating fibre Bragg gratings (FBG) are investigated given the need for dynamic strain capture and multiplexed sensors. An arrayed waveguide grating based interrogator is developed. The relationships between key performance indicators, such as strain range and linearity of response, and parameters such as the FBG length and spectral width are determined. It was found that the inclusion of a semiconductor optical amplifier could increase the signal-to-noise ratio by ~300% as the system moves to its least sensitive. An alternative interrogator is investigated utilising two wave mixing in erbium-doped fibre in order to create an adaptive system insensitive to quasistatic strain and temperature drifts. Dynamic strain sensing was demonstrated at 200 Hz which remained functional while undergoing a temperature shift of 8.5 °C. In addition, software techniques are investigated for locating impact events on a curved composite structure using both time-of-flight triangulation and neural networks. A feature characteristic of composite damage creation is identified in dynamic signals captured during impact. An algorithm is developed which successfully distinguishes between signals characteristic of a non-damaging impact with those from a damaging impact with a classification accuracy of 93 – 96%. Finally, a demonstrator system is produced to exhibit some of the techniques developed in this thesis.
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Latham, Michael John. "Restructuring the West European defence aerospace industry : a "domestic filtration" approach." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521958.
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Darling, Eric J. (Eric John) Carleton University Dissertation Management Studies. "A study of government-business partnerships in the aerospace/defence electronics industry." Ottawa, 1990.
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Delmonte, Tiina. "Studies into the potential uses for microstructured fibres in aerospace and defence applications." Thesis, Heriot-Watt University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493515.
Повний текст джерелаАнотація:
Microstructured fibres are investigated with the view to integrating these novel fibre types into aerospace platforms in the future. Several potential applications are studied using different properties of a variety of microstructured fibres.
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Barnett, Neil John. "A proposed model for servitization based collaboration in the UK Aerospace Defence industry." Thesis, University of the West of England, Bristol, 2016. http://eprints.uwe.ac.uk/27696/.
Повний текст джерелаАнотація:
In many sectors customers are increasingly seeking service contracts rather than buying products. High tech capital equipment firms attracted by the potential revenue benefits are choosing to move from supplying product only to supplying product and services. This concept is known as ‘Servitization’. Through empirical evidence the academic literature has shown that businesses face challenges in undertaking the transformation from product to service provision and that organisational, cultural, commercial and operational challenges have the potential to erode the desired and expected benefits sought from such a transition. The research presented in this thesis investigates and identifies the features and challenges of servitization in the context of a complex engineering service provided by the UK Aerospace Defence industry. The research also explores the reported costs and front of mind costs for the provision of a complex engineering service. Particular attention is given to the problem of less than expected profitability during and post transformation to service. This research adopts a qualitative approach through the use of a single case study with multiple case examples of the complex engineering service. Findings identify a number of challenges associated with the transformation from product to service provision that include strategy, organisation and enterprise management, contracting, risk, culture and operations. Considering these findings holistically it is suggested that a paradigm shift needs to occur, changing both managers perspective and the business models employed if the firm is to provide a sustainable service offering. New ways of structuring and managing the enterprise to deliver the service value proposition will be required. This will include the development of performance management of all operations across the enterprise required as a minimum to ensure optimum performance of service delivery at lowest cost.
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Iakovaki, Antigoni. "Service supply chain integration in multi-organisation networks : findings from the defence aerospace sector." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610686.
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Miah, Abdul. "Product-based environmental metrics for use within aerospace, defence, space and security industries (ADS)." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845983/.
Повний текст джерелаАнотація:
Within the aerospace, defence, space, and security (ADS) industries, there is a growing reporting requirement and interest in understanding and reducing the environmental impacts of products and related risks to business. This dissertation presents the research carried out in collaboration with six ADS companies (ADS Group, Airbus Group, BAE Systems, Bombardier Aerospace, Granta Design, and Rolls-Royce) to establish industry methods for consistently measuring and reporting two pre-selected product-based environmental indicators identified as important to the industry: energy consumption and access to resources. Following an action research approach, four potential methods for calculating and reporting the manufacturing energy footprint of ADS products were identified and industry tested on three case study parts selected by Airbus Group, Bombardier Aerospace, and Rolls-Royce. Methods tested were: (1) Direct measurement, (2) Theoretical calculation, (3) Facility level allocation of energy consumption (based on annual production hours, quantity, and weight of parts manufactured), and (4) Approximation based on generic data. Method 3 (Production Hours) was found to be the most suitable “single” method for immediately reporting the manufacturing energy footprint of parts as it was quick to implement and based on widely available industry data. Regarding the comparability of methods, methods were found to be incomparable and produce significantly different results when applied to calculate the manufacturing energy footprint of the same part. Differences in the comparison of two methods could be in the order of one magnitude based on findings. Such large differences are significant for understanding energy use/costs, environmental impacts (e.g. carbon footprint), and reliably reporting and comparing information for informing decisions. Therefore, methods for calculating the manufacturing energy footprint of products cannot be assumed to be interchangeable and stacked in LCAs, EPDs, and other standards. These findings challenge current LCA practices and the interpretation of product-based environmental declarations if multiple methods have been used and results stacked. Thus, existing standards and growing product-orientated environmental polices allowing for the use of multiple methods (e.g. EPDs and PEFs) may indeed proliferate incomparability rather than engender comparability. Regarding approximating product energy footprints using generic data, the research was only able to approximate the machining energy consumption associated with the case study parts because of data gaps in the generic database. However, a high comparability between generic data use and direct measurement (i.e. specific/primary data) was found. These limited findings challenge attitudes towards generic data use and indicate potential scope to replace expensive primary data collection with more cost-effective (and similarly accurate) generic data. With regards to proposing a method for measuring the access to resources (A2R) product-based environmental indicator, several supply risk indicators and methodological choices for measuring the indicator were identified. Methodological choices included decisions such as to normalise and aggregate supply risk indicators into a single score. A workshop with the industry consortium was consequently carried out to explore and agree: (1) what indicators should be selected to appropriately measure A2R, and (2) how the selected indicators should be measured. Out of 18 potential supply risk indicators, five were identified as key: conflict material risk, environmental country risk, price volatility risk, sourcing and geopolitical risk, and monopoly of supply risk were selected because of clear links to legislation, use of reliable data, and effect on material prices. Regarding methodological choices for measuring A2R, the industry consortium preferred to avoid normalising and aggregating indicators to prevent masking information. The dissertation highlights several major contributions to knowledge, industry, policy, and the development of standards as a result of the research. The main contribution to knowledge is the methods developed and the learnings derived from the process undertaken to determine them. The main contribution and benefit to the ADS industries are single, practical, research informed, and industry consortium agreed methods for cost-effectively measuring two product-based environmental indicators (which support the informational requirements of a wide range of stakeholders and potential end-uses). The examined indicators and the 'case study’ approach utilised with an industry consortium to identify the generic issues in developing suitable methods will be of value for: (1) other industries with similar product/value chain characteristics, and (2) the development of methods for measuring other product-based environmental indicators for industry use (e.g. water, waste, recyclability, etc.). Presented research outcomes provide valuable industry insights for informing the development of emerging product-orientated environmental policies and standards in a manner which benefit the ADS industries and broader environment. Overall, the research has enhanced academic understanding and provides industry capability to support businesses and other similar industries to consistently assess, report, and improve the sustainability of their products and supply chains.
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Ali, Usman. "Configuration management process maturity : definition and maturation of configuration management for aerospace and defence industries." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/configuration-management-process-maturity-definition-and-maturation-of-configuration-management-for-aerospace-and-defence-industries(63343e6b-9f51-4492-b934-00394ef2720c).html.
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This research focuses on the effective implementation and continuous improvement methodologies for Configuration Management practices within aerospace and defence industries. The research is conducted mainly to develop a Configuration Management Maturity Model which is based on Critical Success Factors and Barriers to Configuration Management implementation. The motives behind this research were the lack of understanding and problems in the implementation of high-grade Configuration Management systems as highlighted by other researchers. The research is conducted in three phases through interviews and questionnaire surveys with experienced Configuration Management professionals working in aerospace and defence industries. The first part of this research identifies, prioritizes, and categorizes the Critical Success Factors for Configuration Management and devises a Configuration Management Activity Model to help practationers in the effective implementation and continuous improvement of the process. The second part of the research sets out to identify and prioritize the obstacles to effective implementation of Configuration Management practices, categorized these obstacles into more manageable groups of factors, and analysed the effects of multiple factors on identification and rating of these barriers. Both studies were conducted through mixed method research with in-depth interviews followed by questionnaire surveys. The governance aspect of the process is also investigated to a great deal in the second part through interviews to conclude on process governance in various setups. The third part of this research is related to the development of a Configuration Management Maturity Model. It is important to note that other maturity models on the topic are generic in nature and emphasis on ‘what’ to implement instead of ‘how’ to implement which has left a gap of uncertainty that forced us to devise a suitable framework. The Configuration Management Maturity Model is an assessment tool which not only provides benchmark information but also helps to identify the strengths and weaknesses of the process. This maturity framework is unique in its presentation and unlike previous maturity models, is based on current Configuration Management practices, Critical Success Factors, and Barriers to Configuration Management implementation. This maturity model will help organizations to assess their current level of maturity, identify rational targets for improvements, and will help in providing action plans for enhancing their configuration management process capability. Like the previous two studies, this part of the research is conducted through semi-structured interviews followed by questionniare surveys.
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Cullen, Penny-Anne. "Contractual and working relations in the aerospace industry: A comparison of the Civil and defence sectors." Thesis, University of Warwick, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500586.
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Jackson, Ian. "The economics of the UK aerospace industry : a transaction cost analysis of defence and civilian firms." Thesis, University of York, 2004. http://etheses.whiterose.ac.uk/10976/.
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Raja, Sandeep. "The systematic development of Direct Write (DW) technology for the fabrication of printed antennas for the aerospace and defence industry." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14930.
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Low profile, conformal antennas have considerable advantages for Aerospace and Military platforms where conventional antenna system add weight and drag. Direct Write (DW) technology has been earmarked as a potential method for fabricating low profile antennas directly onto structural components. This thesis determines the key design rules and requirements for DW fabrication of planar antennas. From this, three key areas were investigated: the characterisation of DW ink materials for functionality and durability in harsh environments, localised processing of DW inks and the optimisation of DW conductive ink material properties for antenna fabrication. This study mainly focused on established DW technologies such as micro-nozzle and inkjet printing due to their ability to print on conformal surfaces. From initial characterisation studies it was found that silver based micro-nozzle PTF inks had greater adhesion then silver nano-particle inkjet inks but had lower conductivity (2% bulk conductivity of silver as opposed to 8% bulk conductivity). At higher curing temperatures (>300??C) inkjet inks were able to achieve conductivities of 33% bulk conductivity of silver. However, these temperatures were not suitable for processing on temperature sensitive surfaces such as carbon fibre. Durability tests showed that silver PTF inks were able to withstand standard aerospace environments apart from Skydrol immersion. It was found that DW inks should achieve a minimum conductivity of 30% bulk silver to reduce antenna and transmission line losses. Using a localised electroplating process (known as brush plating) it was shown that a copper layer could be deposited onto silver inkjet inks and thermoplastic PTF inks with a copper layer exhibiting a bulk conductivity of 66% bulk copper and 57% bulk copper respectively. This was an improvement on previous electroless plating techniques which reported bulk copper conductivities of 50% whilst also enabling DW inks to be plated without the need for a chemical bath. One of the limitations of many DW ink materials is they require curing or sintering before they become functional. Conventional heat treatment is performed using an oven which is not suitable when processing DW materials onto large structural component. Previous literature has investigated laser curing as means of overcoming this problem. However, lasers are monochromatic and can therefore be inefficient when curing materials that have absorption bands that differ from the laser wavelength. To investigate this, a laser diode system was compared to a broadband spot curing system. In the curing trials it was found that silver inks could be cured with much lower energy density (by a factor of 10) using the broadband white light source. Spectroscopy also revealed that broadband curing could be more advantageous when curing DW dielectric ink materials as these inks absorb at multiple wavelengths but have low heat conductivity. Themodynamical modelling of the curing process with the broadband heat source was also performed. Using this model it was shown that the parameters required to cure the ink with the broadband heat source only caused heat penetration by a few hundred micro-metres into the top surface of the substrate at very short exposure times (~1s). This suggested that this curing method could be used to process the DW inks on temperature sensitive materials without causing any significant damage. Using a combination of the developments made in this thesis the RF properties of the DW inks were measured after broadband curing and copper plating. It was found that the copper plated DW ink tracks gave an equivalent transmission line loss to a copper etched line. To test this further a number of GPS patch antennas were fabricated out of the DW ink materials. Again the copper plated antenna gave similar properties to the copper etched antenna. To demonstrate the printing capabilities of the micro-nozzle system a mock wireless telecommunications antenna was fabricated on to a GRP UAV wing. In this demonstrator a dielectric and conductive antenna pattern was fabricated on to the leading edge of the wing component using a combination of convection curing and laser curing (using an 808nm diode laser).
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Jenvald, Mattias, and Mikael Hovmöller. "Reducing Delays for Unplanned Maintenance of Service Parts in MRO Workshops : A case study at an aerospace and defence company." Thesis, Linköpings universitet, Produktionsekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167203.
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Service parts sometimes break down unexpectedly and require maintenance. The irregular nature of the need for this type of maintenance makes forecasting difficult and unreliable. Saab currently experiences problems with long delays when performing unplanned maintenance of service parts used in the two models of Gripen aircraft, Gripen C and Gripen D. These delays are source of monetary waste, as late delivery of maintained service parts results in Saab having to pay penalty fines to the customers. The purpose of this master thesis was to analyze data collected during a case study at Saab in Linköping, and suggest improvements for how to reduce these delays. This study focused on analyzing what caused the delays, and how the information provided by the customers can be used by the operative planners at the Maintenance, Repair \& Overhaul (MRO) workshops in order to be more efficient. The data was collected during the case study using semi-structured interviews of 16 people working with the current system, as well as by collecting historical data from an internal database at Saab. This data was analyzed in parallel with a literature study of relevant research related to service parts supply chains, MRO workshops, and unplanned maintenance operations. The analysis showed that there were four types of interruptions of maintenance; Internal stock-out of spare parts, internal stock-out of sub-units, external delays at the Original Equipment Manufacturer (OEM), and internal equipment breakdowns. A root cause analysis found that the four root causes of delays were: Saab does not have any contracts that incentivizes their OEM's to deliver on time. The data from the technical report is not used to provide the operative planners with information about incoming orders. The MRO workshops do not have a standardized system for prioritizing maintenance of service parts. The MRO workshops currently lacks a method for predicting certain types of machine breakdowns.
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Venditti, Sara. "New Wings for Europe : Western European Strategic Cooperation and Integration in the Aerospace Field : Ariane and Eurofighter, 1973–1985." Doctoral thesis, Luiss Guido Carli, 2020. http://hdl.handle.net/11385/203542.
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This thesis deals with the history of the European Integration process through the study of the aerospace cooperation during the 1970s and 1980s. In this thesis, I do not approach the European integration process through the traditional narrative or the international relations (institutions, nations, etc…), but through the lens of technology and the so-called “hidden integration”. In fact, this work uses technology to look at the political and industrial processes that involved governments, scientists, and organizations, and fostered the European integration process. The chronology and the mirror-like structure of this work is based on my two case studies: the European Fighter Aircraft (EFA) and the Ariane launcher. They both went through similar development phases (i.e. debates, feasibility studies, industrial agreements, launches/flights) and during the same decades. I decided to analyse Ariane and EFA because they are the first successful European projects led and produced exclusively by European countries. My aim is to show how EFA and Ariane played a crucial role in boosting the European construction as ‘hidden’ tools for integration, but also in leading the Western European countries to seek and achieve independence in the air and space industry and market.
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Collison, Kurt Ryan. "The South African military aerospace industry: An overview of the special defence account more commmonly known as 'The South African Arms Deal'." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5741_1256300601.
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The paper focuses specifically on the South African Military Aerospace Industry as most of the weapons procured under the arms deal were military aircraft. Taking into account the numerous social needs of South Africa, the purpose of this paper is to inter alia try to establish the rationale behind the South African government's decision to to purchase an array of military weapons from foreign suppliers at an initial cost of almost thirty billion rand. In order to gain a better undrstanding of the topic, the author gives a brief overview and history of the South African Aerospace industry.Furthermore, an examination of the politics of the transition from apartheid to democracy and how this affected the aeropace industry is given.
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Gartzke, Ulf. "The Boeing / McDonnell Douglas and EADS mergers : ethnocentric vs. regiocentric consolidation in the aerospace and defence industry and the implications for international relations." Thesis, London School of Economics and Political Science (University of London), 2010. http://etheses.lse.ac.uk/266/.
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This thesis relies on realist and neo-mercantilist approaches to explain the consolidation of the US and European aerospace and defence industry during the second half of the 1990s. Based on two case studies, the Boeing / McDonnell Douglas (BMD) merger in 1997 and the EADS merger in 1999, the thesis analyses the different political and economic motivations that led these aerospace and defence companies as well as their respective home governments to pursue either ethnocentric consolidation (in the case of the US) or regiocentric consolidation (in the case of France, Germany, and Spain) strategies. The BMD merger is interpreted as an attempt by the American hegemon to ensure that the important military, economic, and technological benefits derived from this strategic sector continue to accrue, above all, to the United States and its aerospace and defence industrial base. The cross-border EADS merger, in contrast, is viewed as a Franco-German-led counterbalancing attempt to guarantee the survival and autonomy of the European aerospace and defence industry, including Airbus, in the face of growing competitive pressures from the rapidlyconsolidating US mega-primes like Boeing. The thesis contrasts several high-profile transatlantic M&A deals in a variety of business sectors with the marked absence of similar transactions between US and European aerospace and defence companies. It thus highlights the strategic nature of this particular sector as well as American concerns about the proliferation of advanced US technologies to third countries, including to European NATO allies. Ultimately, realist and neo-mercantilist arguments prevailed over liberal-institutionalist / globalisation arguments among policymakers and business leaders on both sides of the Atlantic (especially in Washington, DC and Paris) – thus paving the way for the BMD and EADS mergers.
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Bergstedt, Malin. "Sales and Operations Planning Framework : How to balance demand and supply for a project-oriented and complex organization operating inthe aerospace and defence industry." Thesis, Linköpings universitet, Produktionsekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156501.
Повний текст джерелаАнотація:
One challenge organizations are facing in all industries is determining the likely events of the future and developing strategies to handle these challenges. Sales and operations planning are a decision-making process and tool that helps organizations to allocate resources not only to handle the challenges but also to take advantage of future conditions by balancing supply and demand. There is only a limited amount of framework and models available today. This project will divulge and reveal a new framework for sales and operations planning which has been developed in collaboration with an organization operating in the aerospace and defence industry. The basis of the framework consists of a monthly five step process that facilitates the organization in making decisions based on long term (five-years) organizational goals and tying them in with project specific needs. Ultimately, this will provide a centralized system in meeting current project specific demands whilst ensuring future operations are not compromised but enhanced. The company’s current sales and operations planning maturity level was evaluated and compared to the developed framework to find gaps of what needs to change for the company to have proactive sales and operations planning.
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Fabbri, Riccardo. "Conceptualization, design & simulation of a small asteroid probe." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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The Asteroid Impact and Deflection Assessment (AIDA), is an upcoming mission resulting from the collaboration of ESA and NASA and aims at assessing the effects of a kinetic impact on an asteroid for the purpose of threat mitigation. In this framework, this research seeks to prove the feasibility of a small lander design able to autonomously land on the secondary object of the asteroid system Didymos.
Initially, an overview of the most suitable guidance laws and sensors is provided. This highlighted that some types of proportional navigation guidance laws and the ZEM/ZEV could be good candidates and are therefore further analyzed in the following chapters. Meanwhile, a set of sensors comprising altimeter, camera, Star-Tracker and accelerometers was considered.
To assess the effect of the noise affecting the sensors on the translational dynamics of the probe, the system is linearized and studied. This permitted to highlight that the most relevant disturbances are the ones that affect the determination of the LOS rate, hence the readings of camera and star-tracker.
Afterward, the deployment is simulated in the details in a simulator, this permitted to determine that a combination of a modified version of the true proportional navigation and ZEM/ZEV provide a good solution in terms of guidance laws.
Unfortunately, because of the lack of details characterizing the asteroid model, it was not possible to realistically simulate the ZEM/ZEV. Therefore, it is suggested as the next step of study to carry out further investigation and to develop a simulator able to reach the depth of details required.
Finally, a proposed set-up of sensors is delineated and a Monte-Carlo run analyzing the robustness and reliability of this design for the MTPN is reported.
The outcome seems to demonstrate that with a very compact and simple design, the probe is capable to autonomously insert itself in a trajectory leading from the deployment location to the target asteroid.
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Lungu, Sorin. "European defense market integration : the aerospace sector in 1987-1999 /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2005.
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Thesis (Ph.D.)--Tufts University, 2005.Chair: Robert L. Pfaltzgraff, Jr. Submitted to the Fletcher School of Law and Diplomacy. Includes bibliographical references (leaves 358-398). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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Arsenault, Reginald W. "Creation of a CRM selection methodology for the aerospace & defense industry." [Denver, Colo.] : Regis University, 2006. http://165.236.235.140/lib/rarsenault2006.pdf.
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Donovan, Mark H. "The French Aerospace and Defense Industries: changing dynamics of procurement and consolidation." Thesis, Monterey, California. Naval Postgraduate School, 1998. http://hdl.handle.net/10945/8427.
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Approved for public release; distribution is unlimitedFrance's traditions of national sovereignty and its global status as a "great power" help to explain its investments in an independent and autonomous armaments industry. The resulting capabilities, ranging from fighter aircraft to nuclear weapons, have helped to ensure the position of France as a leading nation during the latter half of the twentieth century. Overcoming the inherent problems associated with state control and oversight of the means of production, France has developed a robust manufacturing capability and has produced, among other systems, technologically advanced designs in combat aircraft (the Rafale fighter), space rocket launchers (the Ariane 5 launcher), and remote sensing satellites (the Helios military satellite). However, the need to continue incorporating modem, expensive technology into French systems in the face of budgetary cutbacks has brought the future viability of autonomous and French-led programs into question. As a result, France and other major European nations have tried to find a common solution to consolidate each country's aerospace and defense firms into one corporate entity that could compete effectively against the United States. However, problems rooted in maintaining national capabilities, especially in France, have kept this design from becoming a reality
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Johnstone, Jeffrey Carl, and Patrick Daniel Keavney. "Pricing Strategy, Pricing Stability and Financial Condition in the Defense Aerospace Industry." Thesis, Monterey, California. Naval Postgraduate School, 1987. http://hdl.handle.net/10945/41618.
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Approved for public release, distribution unlimitedAll original copies missing. Best digital copy available.
The purpose of this research is to determine if pricing strategy and pricing stability for products in the defense aerospace industry can be predicted based on a firm's financial condition. The sample for this research includes 17 contractors and 52 missile and aircraft programs. Two separate issues are addressed. The first issue concerns the relationship between financial condition and contractor pricing strategy. The second concerns the relationship between organizational slack and pricing stability. The overall findings are: 1) That a limited amount of variation in pricing strategy can be explained through the use of a linear regression model using financial ratios; and 2) That no apparent relationship exists between organizational slack and pricing stability.
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Gianzina-Kassotaki, Olga. "Ambidexterity and leadership : a multilevel analysis of the aerospace and defense organizations." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/95904/.
Повний текст джерелаАнотація:
The global security concerns combined with the emergence of firms operating at international level have intensified the competition among companies in the aerospace and defense sector. In this challenging business environment, the adoption of organizational ambidexterity could provide a company with the key advantage in dealing with the increasing competitive forces. Organizational ambidexterity, which denotes the simultaneous use of exploration and exploitation in organizations, ensures both short-term profitable operation through the exploitation of successful current products and long-term survival through the exploration of innovative solutions for future customer needs. According to ambidexterity and leadership literatures, transformational and transactional leadership styles, which constitute ambidextrous leadership behaviors, promote ambidexterity across multiple levels of the organization’s structure and become key elements for the successful implementation of organizational ambidexterity. This enactment of ambidexterity across levels constitutes ambidexterity penetration, a term first introduced in this study. In this context, this study attempts to address research gaps in the ambidextrous leadership research by linking the micro-level leadership styles with the macro-level corporate structure and environment by investigating: (a) how ambidexterity penetrates across multiple levels vertically and horizontally, (b) which tensions emerge from ambidexterity penetration and how they are managed, and finally (c) whether the type and size of the particular organizational setting is related to this ambidexterity penetration. To address these research questions, a dual case study research framework was used by analyzing data collected from: (a) a governmental organization with multiple business units dispersed throughout Europe, and (b) three aerospace and defense companies of different sizes with multiple business units in Europe and the United States. Data from 44 confidential, face-to-face and e-mail interviews, along with published archival information, was collected, compiled, and analyzed in the course of two years. The diversity of the studied business units in terms of type and size, and the compilation of data across multiple corporate levels (CEO to employee) provided a unique setting to uncover key findings that highlight the challenges and accomplishments of ambidextrous leadership in corporate and governmental organizational structures. The systematic, multi-level analysis of the collected data revealed variations in ambidexterity penetration across multiple levels of management in different types of organizations as a result of corporate culture and environmental constraints. However, in most cases, the analysis also uncovered: (a) similar characteristics of low horizontal, but high vertical penetration of ambidexterity, mainly due to their inflexible organizational structure, (b) prevailing transactional (exploitative) leadership style, as their leaders appear to act mostly as ambidextrous managers, (c) ambidexterity penetration across multiple levels via similar processes irrespective of type and size of each organization, and finally (d) the key role of middle management as a cohesive link within the firm’s structure that enables the ambidexterity penetration across management levels. In conclusion, this study contributes at the intersections of ambidexterity and leadership research in the context of the aerospace and defense sector and offers a timely empirical investigation of the competing challenges that these firms are called upon to face in the light of the emerging global security challenges and the subsequent vast investment in resources and capital.
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Wu, Marcus Shihong. "Design for affordability in defense and aerospace systems using tradespace-based methods." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/89937.
Повний текст джерелаАнотація:
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2014.Thesis: S.M. in Technology and Policy, Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 262-270).
Program failures have plagued the defense and aerospace industry for decades, as unanticipated cost and schedule overruns have rendered the development of systems ineffective in terms of time and cost considerations. This raises the need to holistically include performance, cost and schedule considerations during the early-phase design of systems to perform valuable tradeoffs that derive more feasible and affordable solutions. This paradigm is the design for affordability. This design for affordability conundrum is targeted at defense and aerospace systems, which have complex mission requirements and stakeholder involvement that are susceptible to changes and perturbations over time. Without a systematic framework, the design for affordability process can potentially become cognitively challenging to system architects and lead to unsatisfactory results. To resolve affordability, it can first be defined as the property of becoming or remaining feasible relative to resource needs and resource constraints over time. Affordability can then be treated as an ility that drives the design of more affordable yet technically sound architectures. Tradespace-based methods are introduced to drive affordability and incorporate these holistic considerations into the design process. They facilitate the systematic and disciplined search for affordable solutions to the system, program and portfolio of interest. Multi-Attribute Tradespace Exploration (MATE), Epoch-Era Analysis (EEA) and the Multi-Attribute Expense (MAE) function were modified for affordability analysis. Their feasibility was demonstrated through application to two design case studies. Results from both case studies demonstrated the dynamic tradeoffs among performance, cost and schedule parameters. Tradespace-based methods can thus be applied to the progressive design of systems, programs and portfolios using either a bottom-up or top-down approach to deliver affordable solutions in these cases. Affordability is not only an engineering problem; it is also a policy and management problem. Therefore, affordability can be approached through perspectives beyond engineering design. New policies and refined management practices can be used alongside tradespace-based methods for affordability analysis to ensure the continued delivery of affordable systems for the future.
by Marcus Shihong Wu.
S.M.
S.M. in Technology and Policy
25
Vaughn, Amanda F. (Amanda Faith) 1977. "A holistic approach to manufacturing system design in the defense aerospace industry." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82236.
Повний текст джерела
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Shaw, Thomas E., Alexander Lengyel, and Greg Ferre. "An Assessment of the Degree of Implementation of the Lean Aerospace Initiative Principles and Practices within the US Aerospace and Defense Industry." Defense Contract Management Agency, 2004. http://hdl.handle.net/1721.1/7320.
Повний текст джерелаАнотація:
This report is a formal documentation of the results of an assessment of the degree to which Lean Principles and Practices have been implemented in the US Aerospace and Defense Industry. An Industry Association team prepared it for the DCMA-DCAAIndustry Association “Crosstalk” Coalition in response to a “Crosstalk” meeting action request to the industry associations. The motivation of this request was provided by the many potential benefits to system product quality, affordability and industry responsiveness, which a high degree of industry Lean implementation can produce.
27
Myers, Kevin Michael. "Building flexibility in the volatile aftermarket parts : supply chains of the defense aerospace industry." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39695.
Повний текст джерелаАнотація:
Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics; in conjunction with the Leaders for Manufacturing Program at MIT, 2007.Includes bibliographical references (p. 89-90).
Within the Integrated Defense Systems of The Boeing Company, aftermarket support of military aircraft serves as an increasingly large source of revenue. One of the newest contracts between Boeing and the U.S. Government created such a supply partnership at the Army Rotorcraft Repair Depot in Corpus Christi, Texas. At this depot, all Army helicopters, including Boeing's AH-64 Apache Attack helicopter and CH-47 Chinook Cargo helicopter undergo major repair and overhaul. In 2004, Boeing entered an agreement with the U.S. Government to assume responsibility of the repair depot's supply chain for aftermarket parts for Boeing rotorcraft. Over the last two years, Boeing has been creating and refining Corpus Christi's support structure to ensure that the required repair parts arrive when demanded. In establishing this new supply chain, Boeing has identified numerous inefficiencies as a result of inaccurate and highly volatile forecasts. This thesis examines the impact of volatility within the new support structure and creates flexible solutions to mitigate its negative effects on lead times, multiple sources of supply and inventory management.
(cont.) Efforts to increase communication flow across the supply chain are used to capitalize on economies of scale for cost reduction while safety stock recommendations are made for critical end-items. Monte Carlo simulations are employed to justify and validate the solutions. The results of the thesis reveal that a strategic selection of raw material safety stock can reduce procurement lead times by an average 61% for a subset of parts while maintaining financial responsibility. Additionally, by leveraging cost reduction techniques, an average increase of 11% in Boeing's income from sales can be achieved while eliminating inefficient administrative delays and increasing customer fulfillment rates. These two recommendations demonstrate specific solutions for mitigating the effects of demand volatility and inaccurate forecasting.
by Kevin Michael Myers.
S.M.
M.B.A.
28
Wood, David J. H. "Corporate consolidation an event study of historic stock prices in the defense aerospace industry." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FWood.pdf.
Повний текст джерелаАнотація:
Thesis (Master of Business Administration)--Naval Postgraduate School, December 2009.Thesis Advisor(s): Laverson, Alan. Second Reader: Gates, William. "December 2009." Description based on title screen as viewed on January 27, 2010. Author(s) subject terms: Defense industry, Consolidations, Mergers, Acquisitions, Event study, Boeing, Lockheed Martin, Northrop Grumman, Raytheon. Includes bibliographical references (p. 55-58). Also available in print.
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Melin, Peter B. "The impact of accounting methods on cost reduction rates in defense aerospace weapons system programs." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23256.
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Pomponi, Renata Alma. "Control of manufacturing processes with MRP II : benefits and barriers in the defense aerospace industry." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11167.
Повний текст джерела
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Rose, William B. (William Burford). "The Introduction of Robotic Technology: Perceptions of the Work Force of an Aerospace Defense Company." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc330596/.
Повний текст джерелаАнотація:
This dissertation examines the effect that the introduction of an advanced manufacturing technology, specifically robotics, has on the work force of an aerospace defense company. In this endeavor, there are two main objectives. First, this study determines whether workers feel that their jobs are threatened by the introduction of robotic technology. Secondly, the research compares the degree to which workers from different labor types feel this threat. A review of the literature reveals that the technical factors involving manufacturing technology have been thoroughly examined and discussed, but the effect that they have on the work force has been somewhat neglected. This dissertation develops ten hypotheses to ascertain the perceived threat to job security for workers within an aerospace defense company. This study is based on an employee survey that examined the employee's perceived threat to job security by the introduction of robotics. The primary research was obtained from employees within an aerospace defense company through the use of questionnaires in a three phase approach. The first phase utilized a pretest that sampled the questionnaire prior to the company-wide solicitation. The second phase administered the questionnaire to the three labor types within the work force. Phase three consisted of data reduction and the comparison of the primary data to the research hypotheses. The results of the study concluded that workers closer to the robotic technology (hands-on employees) felt more threatened about their job security than workers more removed from the technology (support personnel and management). It was further found that the hands-on workers felt that the major factor that lead to the introduction of robots was the desire to lower labor costs while support personnel and managers felt that the major factor that lead to the introduction of robots was due to increasing productivity. Additional hypotheses tested in this study include the effect that robots have on the perceptions of the work force toward the company's employment level, worker apprehension and reaction, training, safety, health, and competition.
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Hughes, Robert Rhys. "High-sensitivity eddy-current testing technology for defect detection in aerospace superalloys." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/79695/.
Повний текст джерелаАнотація:
Industrial eddy-current testing (ECT) inspections of aerospace superalloys, such as Titanium 6Al-4V, must reliably detect sub-millimetre surface breaking defects. The sensitivity of such measurements is hindered by the materials' low conductivity and high coherent background material noise, making the high sensitivity standards required by industry harder to achieve. It is demonstrated herein that using eddy-current array (ECA) technology also introduces inspection "blind-spots", whereby small defects could be missed. This supports the motivation to develop techniques for enhancing the sensitivity of typical ECT and ECA measurements. The early stage research and development of a novel ECT measurement method is presented, and shown to improve the standard measurement sensitivity of industrial ECT inspections. A defect signal enhancement phenomenon within a band of frequencies close to the electrical resonance of an ECT probe, termed near electrical resonance signal enhancement (NERSE), was observed and characterised. This phenomenon was demonstrated to be a direct result of the shifting resonant frequency of the probe in the presence of material discontinuities. Frequency sweeping chirp signals were used to generate electrical resonance traversing frequency spectra measurements of the inspection probe in the presence of material discontinuities. Critical feature analysis of the results demonstrated a correlation between defect dimensions and peak NERSE amplitude, but failed to draw any conclusive trends between discontinuity dimensions and the resonant frequency shift. This was attributed to the relatively small defect sample set used and the size of many of the machined defects being smaller than the diameter of the inspection coil. An ECT probe was excited at a single frequency carefully selected to correspond to the NERSE peak frequency. A study was performed to statistically analysis the sensitivity of this NERSE measurement compared to a standard excitation frequency measurement used in industry. The results demonstrated that a NERSE frequency inspection was able to reliably detect a defect size of 0.82mm, compared to 1.09mm achieved by a standard operating frequency.
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Place, David S. Grubbs Gregory A. "Empirical evaluation of a model of team collaboration using selected transcripts from September 11, 2001." Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Jun/09Jun%5FPlace.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Systems Technology (Command, Control and Communication (C3)))--Naval Postgraduate School, June 2009.Thesis Advisor(s): Hutchins, Susan G. "June 2009." Description based on title screen as viewed on July 13, 2009. Author(s) subject terms: Team Collaboration, Team Communication, NORAD, NEADS, September 11, 2001, Cognition, Macro-cognition, Model of Team Collaboration. Includes bibliographical references (p. 193-198). Also available in print.
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Nishizaki, Santor. "Work environment preferences of Los Angeles Generation Y contract managers in the defense and aerospace industry." Thesis, Pepperdine University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3631046.
Повний текст джерелаАнотація:
There are currently 4 different generations in the workplace, and the newest generation, Generation Y, has caused leaders within organizations to rethink their management and workplace cultural approach to leading this emerging generation. This qualitative phenomenological dissertation examines the work environment preferences of Generation Y contract managers who work in the Los Angeles area in the defense and aerospace industry by interviewing 11 participants from both the public and private sectors. The research indicates that this new generation, Generation Y or Millennials, prefer to have autonomy over their workload and schedule, but prefer to have their direct manager active in a mentoring and coaching role, rather than acting as a task-master. In addition, the participants in this study preferred a healthy amount of pressure, but not too much of a workload that would cause them to fail. Lastly, this dissertation found that Millennials have a high preference for innovation and using innovative technology in the workplace to increase efficiency.
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Eady, Levern. "Job embeddedness and intention of voluntary turnover in the aerospace and defense industry| A quantitative study." Thesis, Capella University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3643057.
Повний текст джерелаАнотація:
Employee turnover is one of the greatest problems facing top management teams. The general problem is that employee undesirable voluntary turnover regularly occurs in organizations. This study of job embeddedness is unprecedented and is the first scholarly work using a sample from the Aerospace and Defense Industry. The purpose of this quantitative study was to evaluate the primary data collected to examine the linear association between job (organization and community) embeddedness at the sub-dimension (fit, links, and sacrifice) level and voluntary turnover in the Aerospace and Defense Industry subpopulation System Engineering and Technical Assistance (SETA) support contract workforce. The sample (n = 185) included full-time working adults age 18 to 65 in the United States. The respondents, for two weeks in mid-Spring 2014, self-reported and completed a Likert scale survey as the primary data collection instrument. Three research questions were investigated. Research question 1 determined the relationship between on-the-job embeddedness and voluntary turnover amongst defense SETA support contract employees. The study findings revealed there is a significant relationship between on-the-job embeddedness and intention to voluntary turnover. Research question 2 determined the relationship between off-the-job embeddedness and voluntary turnover amongst defense SETA support contract employees. The study findings revealed there is a significant relationship between off-the-job embeddedness and intention to voluntary turnover. Research question 3 asked, "What is the difference between age, job embeddedness, and voluntary turnover amongst defense SETA support contract employees?" This research question was eliminated because of data skew. In addition, significant gender statistical analysis differences exist.
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Bakkila, Michelle Vivian. "A system dynamics analysis of the interaction between the U.S. government and the defense aerospace industry." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/47560.
Повний текст джерела
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Christian, William J. R. "The development of a strain-based defect assessment technique for composite aerospace structures." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3010051/.
Повний текст джерелаАнотація:
This thesis details the work conducted over three years on the development of strain-based defect assessment techniques for carbon-fibre reinforced composites. This material, whilst exhibiting a high specific strength, is sensitive to defects and thus there is an industrial need for assessment techniques that are capable of characterising defects and obtaining predictions of residual strength or life. The most commonly applied techniques are currently ultrasonic and thermographic non-destructive evaluation. A strain-based defect assessment could lead to more accurate predictions of residual strength, resulting in a reduction of the costs associated with operating composite aerospace structures. The aim of this project is to increase the quality and confidence in residual strength information gained from the non-destructive evaluation of composite defects using strain-based assessments, in addition to currently applied ultrasonic practices for composite structures. A literature review on composite defects and existing techniques for assessing defects was conducted. Knowledge gaps were then identified that if filled, could improve residual strength predictions. Initially, a statistical framework was developed that used Bayesian regression to predict the residual strength of impacted composites, based on ultrasonic non-destructive measurements, that is robust to data outliers. As part of this framework a performance metric for quantifying the accuracy of residual strength predictions was introduced, allowing currently applied assessment techniques to be compared with the novel strain-based assessment. Then, a novel technique for performing strain-based defect assessments was developed that utilised image decomposition and the statistical framework to make residual strength predictions. Digital image correlation was used to measure strain fields which were then dimensionally reduced to feature vectors using image decomposition. The difference between feature vectors representing virgin and defective laminates were quantified, resulting in a strain-based defect severity measure. Bayesian regression was used to fit an empirical model capable of predicting the residual strength of an impacted laminate based on the strain-based defect severity. The accuracy of the strain-based predictions were compared to the accuracy of ultrasound-based predictions and found to outperform the currently applied ultrasonic technique. Strain-based assessment of in-plane fibre-waviness was also explored, as minimal research had been conducted studying waviness defects with full-field techniques. This required the development of a procedure for creating controlled levels of local waviness in laminates. The same strain-based assessment used for assessing impact damage was applied to the fibre-waviness specimens, but for this defect the accuracy of predictions were found to be comparable to the ultrasound-based predictions. However, residual strain measurements were found to be effective for predicting the strength of laminates, indicating that knowledge of the residual strains around a waviness defect may be important when predicting a laminates residual strength.
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Stalker, Joshua D. "A Reading Preference and Risk Taxonomy for Printed Proprietary Information Compromise in the Aerospace and Defense Industry." NSUWorks, 2012. http://nsuworks.nova.edu/gscis_etd/314.
Повний текст джерелаАнотація:
The protection of proprietary information that users print from their information systems is a significant and relevant concern in the field of information security to both researchers and practitioners. Information security researchers have repeatedly indicated that human behaviors and perception are important factors influencing the information security of organizations and have called for more research. The aerospace and defense industry commonly deals with its own proprietary information as well its customers. Further, e-training is a growing practice in this industry, it frequently deals with proprietary information, and has unique information security challenge, thus, serves as additional context for this study.
This study focused on the investigation of two constructs, user reading preference and user perceived risk of compromising printed proprietary information, as well as seven user demographics. These constructs reflect human behavior and risk perceptions associated with compromising printed proprietary information and, thus, provide valuable insights applicable into information security. This study developed a Reading Preference and Risk (RPR) Taxonomy, which allows users to be classified according to the aforementioned two constructs under investigation and provides insightful characterizations of information security risks. A survey based on existing literature, the primary constructs, and several demographics was implemented to assess two research questions and seven associated hypotheses. The survey was sent to 1,728 employees of an aerospace and defense organization. The response rate was 18% with 311 usable records.
The results of the study showed that employees were dispersed across the RPR Taxonomy with 15.1% identified as potentially problematic to the protection of printed proprietary information. The overall results showed that the population had a reading preference for print materials and a high perceived risk for compromising printed proprietary information, as well as significantly higher print preference for e-training materials when it was necessary to retain the content in memory. Significant differences in the two constructs were also found across several demographics including age, gender, frequency of user exposure to proprietary information, the confidentiality level of the proprietary information a user is regularly exposed to, and previous user experience with the compromise of proprietary information. Recommendations for practice and research are provided. Moreover, several areas for future research are also presented.
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Mitchell, A'Shawn Lora. "Corporate Image Branding Strategies to Attract Engineering Talent." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/7561.
Повний текст джерелаАнотація:
Aerospace and defense leaders need corporate image branding strategies to improve their attraction of engineering talent to the industry. The purpose of this single case study was to explore corporate image branding strategies leaders use at an aerospace and defense company to attract talent and increase competitive advantage. The framework for this study was the recruitment equity model. The sample population consisted of 5 marketing leaders and 5 talent acquisition leaders of an aerospace and defense company in the eastern region of the United States. The study participants had a minimum of 5 years of experience attracting engineering talent using branding strategies. Data were collected from semistructured interviews and a review of the company's talent attraction plan. The data analysis process included methodological triangulation, coding, and identifying themes. Four themes emerged: having an attractive place to work, using social media to attract talent, ensuring the mission is the basis for attracting talent, and attracting untapped talent. Findings from this study might assist aerospace and defense leaders in implementing corporate image branding strategies that close the gap of talent attraction to the aerospace and defense industry. The implications for positive social change include the potential to increase innovation and reduce national security vulnerabilities by attracting talent to the aerospace and defense industry. The business leaders of aerospace and defense will keep the industry viable by attracting top engineering talent to a workforce that is responsible for eliminating the advanced threats to the nation and its allies.
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Sinclair, Armond E. "Achieving Program Success with Productive Outcomes: Lessons from Concurrent Engineering for United States Department of Defense Major Defense Acquisition." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1494593155068787.
Повний текст джерела
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Hallander, Per. "Towards defect free forming of multi-stacked composite aerospace components using tailored interlayer properties." Doctoral thesis, KTH, Lättkonstruktioner, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185694.
Повний текст джерелаАнотація:
Use of lightweight materials is an important part of reduction of fuel consumption by commercial aircraft. A considerable number of structural aircraft parts are therefore built of thin layers of epoxy pre-impregnated carbon fibres stacked to laminates. Manufacturing these by hand is costly and different methods of automation have therefore been developed. One cost-effective way of manufacturing is Automated Tape Lay-up of flat stacks followed by a Hot Drape Forming operation. A well-known problem in the industry within forming is fibre wrinkling, which can cause a serious strength knock down. The focus of this thesis has therefore been on understanding how and why wrinkles develop during forming of multi-layer stacks and, based on this, investigate different methods for process and material improvements. The work presented initially investigates the dependency between stacking sequence and wrinkle development. It is shown that wrinkle free forming can be obtained by changing the fibre stacking order. In the following investigation it is shown that the wrinkles cannot be entirely eliminated by local stiffening of the critical layers. In a, related study it is shown that different kinds of wrinkles develops during forming; wrinkles may be either due to global buckling of the entire lay-up or local compression of single layers. Global buckling is due to excessive material. Local compression occurs as the material shear during forming. The work presented leads to an understanding of the importance of making the beneficial neighbouring fibre layers interact during forming. One way to connect neighbouring layers is to tailor the interlayer properties. A study is presented that shows how local manipulation of interlayer properties may steer the multi-layered material into a different deformation mechanisms. The manipulation in this thesis is performed using Multi Wall Carbon Nano Tubes, thermoplastic veils or consolidation of thermoplastic toughener particle interlayers.QC 20160425
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Holland, Marcia Annette. "Aerospace and Defense Industries Online Recruiting of College and University Graduates: Strategies Toward Defining a Comprehensive Informational Benchmark." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc84219/.
Повний текст джерелаАнотація:
This qualitative, inductive study analyzed online recruiting information posted at the websites of five major aerospace and defense corporations to recruit college juniors, seniors, and recent graduates. Recruitment of this group is critical to staff the personnel for the scientific, technical, and management needs of aerospace and defense industries. The study sought: (1) to determine the use of multiple recruitment factors inferred from the literature and recommended for successful recruitment of college graduates, (2) to determine use of online social media (Facebook, Twitter, LinkedIn) to recruit this population, and (3) to explore commonalities among these corporations regarding online recruiting information to determine if a model for online recruitment now exists. A matrix of recruitment factors was developed from a review of the literature on the personnel needs of this industry and on effective recruiting factors for this group. Content analysis involved filtering information at each website with the matrix. Conclusions of this study include: (1) the matrix of recruitment factors and the rating scale developed for the purposes of this study provide a tool for researching, documenting, and comparing recruitment information on the internet; (2) that while these corporations represent the latest applications in technology in their manufacturing processes and products, they do not use social networking technology to the extent the popular and scholarly literature indicate is typical for the target group. Given that the current generation exhibits extensive use of social media, several of these corporations’ websites appear not to utilize this networking technology. Informally, these corporations argue that cyber-security prevents extensive use of social networking sites. Thus, these corporations must determine how to maintain cyber-security while at the same time adopting more accepted use of social networking platforms.
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Gerona, Leovigildo Mahon. "Vibration excitation of aerospace composite materials for defect determination using optical NDT techniques (ESPI/Shearography)." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/13432.
Повний текст джерелаАнотація:
Includes bibliographical references (leaves 87-89).This project investigates the detection of structural damage in aerospace composite materials using ESPI and/or Shearography. ESPI and shearography are both laser based digital interferometric techniques used to non-destructively identify defects in small and large structures. Vibration excitation is proposed to be used as the excitation method for the above Non-Destructive Testing (NDT) techniques. The material may or may not contain any defects, in which case the flaws are to be artificially induced.
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Wheeler, Benjamin (Benjamin Ray). "Reducing enterprise IT fragmentation through standard metrics and decision tools : a case study in the aerospace and defense industry." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66041.
Повний текст джерелаАнотація:
Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division; in conjunction with the Leaders for Global Operations Program at MIT, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 60-61).
Over the last several decades, manufacturing companies around the world have embraced new and powerful business tools made possible with Information Technology. Major investments are frequently made in enterprise-wide systems, such as Enterprise Resource Planning (ERP) solutions to take advantage of cost saving opportunities. While promising in concept, system implementations can grow to be expensive and complicated during execution, commonly resulting in project de-scoping and sacrifices in functionality and integration. If not carefully managed, this can ultimately lead to an environment of costly custom workaround solutions for years to follow, subverting the central goal of the original investment. This thesis presents a case study examining Raytheon's initiative to launch an enterprise ERP system (SAP PRISM) in an effort to standardize and modernize supply chain operations. Within the SAP implementation, the repair and retrofit, or depot, business had major integration components de-scoped due to cost constraints. As a result numerous systems have been developed to manage the business, leading to difficulties in process alignment across manufacturing programs. This work introduces a pilot project with the objective of re-aligning business processes by delivering a portal of common metrics and decision tools to the manufacturing and operations community. With the common portal, the user community gains access to existing centralized data, reducing the need for isolated application development and enabling richer capability.
by Benjamin Wheeler.
S.M.
M.B.A.
45
Riwes, Mina (Mina Diaa). "The "+Add" Model : a proposed strategic framework to create agile high performance aerospace and defense product support supply chains." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81105.
Повний текст джерелаАнотація:
Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references.
The U.S. Aerospace and Defense industry is a vital organ for national security and humanitarian disaster response as well as an economic powerhouse creating jobs and driving exports. News headlines often stop at the sale of complex, hi-tech and expensive defense systems short of capturing the critical aftersales support. However, it is the aftersales support that enables the mission to be accomplished. Without a well-functioning product support supply chain, even the most advanced fleet of fighter jets is rendered useless. This paper looks in-depth at such support supply chains within top industry companies. The investigation spans the current and desired states, and gaps the difference. It also establishes a visionary roadmap to get to the desired state and ensure optimum performance. The research proposes the "+Add Model", an easy to understand 5-level framework to achieve Global Optimization. The +Add Model acronyms stand for Aggregate Dynamic Derivatives, which are key elements in the framework. Aggregate refers to enabling a one integrated supply chain approach at the prime-integrator to benefit from economies of scale elements such as risk pooling and large discount buys. Dynamic refers to enabling a continuously improving supply chain through feedback loops making the supply chain agile. Derivatives refer to the realization that the supply chain is full of hidden derivatives (or levers). As in calculus, the derivative is a measure of how a function changes as its input changes. The +Add model identifies those main supply chain derivative functions and inputs, and then aims to fine-tune them to drive performance. By adopting the +Add Model a prime-integrator is able to improve demand forecast accuracy (Level-1), system planning lead times (Level-2) and increase collaboration with the supplier (Level-3). In turn, levels 1 through 3 enable significantly reduced supplier lead times (Level-4). Finally, as various programs apply the +Add Model approach, Aggregation (Level-5) provides additional benefits such as increased forecast accuracy, discount buys, and lower safety stock inventory through centralization. The +Add Model has a significant impact to the button line, analysis reveals substantial improvements to earnings, economic profit and cash flow while maximizing performance and reducing risk.
by Mina Riwes.
M.Eng.in Logistics
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Donaldson, Catherine W. Johnson David A. "Validating a model of team collaboration at the North American Aerospace Defense Command using selected transcripts from September 11, 2001." Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Jun%5FDonaldson.pdf.
Повний текст джерелаАнотація:
Thesis (M.A. in Systems Technology (Comand, Control, and Communication (C3))--Naval Postgraduate School, June 2008.Thesis Advisor(s): Hutchins, Susan G. ; Kendall, Anthony. "June 2008." Description based on title screen as viewed on August 25, 2008. Includes bibliographical references (p. 181-185). Also available in print.
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Johnson, David A. "Validating a model of team collaboration at the North American Aerospace Defense Command using selected transcripts from September 11, 2001." Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/4069.
Повний текст джерелаАнотація:
On September 11, 2001, during an exercise at the North American Aerospace Defense Command (NORAD), air traffic controllers in New York, Boston, Washington and Cleveland discovered that four American commercial airliners had been hijacked. Initially, the officials at NORAD's North East Air Defense Sector (NEADS) were confused as to whether the hijackings were real world or part of an exercise. The goal of this thesis is to investigate the teamwork and collaboration that occurred between NEADS, their counterparts at the Federal Aviation Administration (FAA) and various air traffic control centers in order to provide military air support and ground civilian air traffic over the United States. Transcripts of recorded audio from the command and control center at NEADS were coded and analyzed in an effort to use a real world example to empirically validate the structural model of team collaboration, developed by the Office of Naval Research. The model focuses on individual and team cognitive processes used during collaboration with the goal of understanding how individuals and teams work together under stress to make decisions.
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Ithier, Jan P. "Synchronizing federal operational planning for national catastrophes." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FIthier.pdf.
Повний текст джерелаАнотація:
Thesis (M.A. in Security Studies (Homeland Security and Defense))--Naval Postgraduate School, March 2010.Thesis Advisor(s): Supinski, Stanley ; Morag, Nadav. "March 2010." Description based on title screen as viewed on April 28, 2010. Author(s) subject terms: Operational Planning, Synchronization Of Plans, Federal Planning, Planning for Catastrophes, Catastrophe Planning, Integrated Planning, Multi-Sector Planning, Federal Operational Plans, Agency Operational Plans, Department Operational Plans. Includes bibliographical references (p. 111-121). Also available in print.
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Reents, Mark J. "Operation Noble Eagle and the use of combat air patrols for homeland defense." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Dec/08Dec%5FReents.pdf.
Повний текст джерелаАнотація:
Thesis (M.A. in Security Studies (Homeland Security and Defense))--Naval Postgraduate School, December 2008.Thesis Advisor(s): Moran, Daniel. "December 2008." Description based on title screen as viewed on February 2, 2009. Includes bibliographical references (p. 87-97). Also available in print.
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Serrano, Munoz Itziar. "Influence of casting defects on the fatigue behaviour of an A357-T6 aerospace alloy." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0117/document.
Повний текст джерелаАнотація:
L’excellente coulabilité, les coûts de production relativement bas, et ratio poids/résistance mécanique élevé des alliages de fonderie Al-Si-Mg en font une des solutions les plus intéressantes dans le secteur automobile ainsi que dans le domaine aérospatial. Toutefois, il est bien connu que la durée de vie de ces composants moulés à grand nombre de cycles (105 < Nf < 107 cycles) est sévèrement réduite lorsque des défauts de fonderie (notamment pores et oxydes) sont débouchants et/ou subsurfaciques sont présents. Ces défauts concentrent les contraintes et peuvent considérablement réduire la période d’amorçage des fissures de fatigue en fonction de leur taille, forme et des caractéristiques microstructurales du matériau. Les défauts internes (à partir desquels les fissures peuvent amorcer et propager sans interaction avec l’air ambiant) ainsi que les défauts de surface (ceux qui sont placés à la surface et en contact direct avec l’air ambiant) vont également nuire la durée de vie des composants moulés. Toutefois, dans le cas des défauts internes, les coefficients de sécurité préconisés par les règles de conception ne font pas intervenir la distance de défaut par rapport à la surface. Le suivi de fissures de fatigue effectué à la surface d’éprouvettes macroscopiques de traction indique que la présence d’un défaut avec une taille supérieure à celle des fissures microstructuralement courtes (√A ≈ 500 μm, taille contrôlée par la SDAS) produit une remarquable réduction de la durée vie. En revanche, la durée de vie n’est pas affectée lorsqu’un défaut plus petit (√A ≈ 300 μm) est présent à la surface car l’amorçage et les premiers stades de propagation sont encore influencés par la SDAS. Les essais de fatigue en torsion pure montrent que la morphologie des surfaces de rupture est fortement influencée par le niveau de contrainte. De plus, le nombre de cycles à l’amorçage est réduit par rapport à la traction. Cet amorçage est multi-site et plusieurs fissures peuvent croitre simultanément au cours de la durée de vie d’une éprouvette, la rupture finale se produisant lors de la jonction de certaines de ces fissures. La propagation des fissures en torsion est largement influencée par la cristallographie locale et les retassures ne semblent pas être des sites de nucléation préférentiels. Les durées de vie odes échantillons macroscopiques contenant défauts artificiel internes (Øeq ≈ 2 mm) sont pratiquement similaires à celles obtenues avec un matériau de référence. L’amorçage et la propagation de fissures internes a été rarement observé lors des expériences de tomographie synchrotron. Dans les rares cas où de telles fissures ont pu être observées, le chemin de fissuration semble fortement influencé par la cristallographie alors que les fissures amorcées depuis la surface se propagent globalement en mode I. La vitesse de propagation des fissures internes est très inférieure à celle des fissures se propageant à partir de la surfaceThe excellent castability, relatively low production costs, and high strength to weight ratios make Al-Si-Mg cast alloys an attractive choice for use in cheaper and lighter engineering components, in both automotive and aerospace industries. However, it is well known that High Cycle Fatigue (HCF) lives (105 < Nf < 107 cycles) of cast components are severely reduced when casting defects (notably pores and oxides) are present at the free surface or subsurface. They act as stress raisers which can considerably reduce the crack incubation period depending on their size, shape and the microstructural features of the surrounding material. Internal casting defects are of special interest to this work. The application of safety coefficients considers that all casting defects present in a component have the same deleterious effect and no attention is paid, for example, to their distance to the free surface. In other words, internal defects (corresponding to the case where the depth of the defect allows crack nucleation and propagation to essentially occur without interaction with the air environment) are considered as damaging to fatigue life as surface defects (those placed at the free surface and in contact with the air environment). Surface crack monitoring performed on uniaxial fatigue specimens indicates that the presence of a surface microshrinkage exceeding the size of microstructurally small cracks (√A ≈ 500 μm, controlled by the SDAS) readily nucleates a fatigue cracks producing steady crack propagation and remarkable reduction in the expected fatigue life. A smaller surface defect (√A ≈ 300 μm) nucleated a crack that did not reduced the expected fatigue life as in this case early stages of propagation are still nfluenced by the SDAS. Pure torsional cycling reveals that the morphology of fracture surfaces is highly influenced by the stress level. In general, torsional fatigue behaviour is described by having reduced (with respect to uniaxial testing) and multisite crack nucleation periods. Several dominant cracks can evolve simultaneously and the final failure occurs by the linkage of some of those cracks. Crack propagation is controlled by the crystallography and pores do not appear to be preferential nucleation sites. S-N curves show that macroscopic specimens containing Øeq ≈ 2 mm internal artificial defect produce similar fatigue lives to those obtained with a defect-free material. Internal crack nucleation was rarely observed during synchrotron tomography experiments; instead the fatal cracks initiated from much smaller surface defects. Tomographic images show that, in the case of internal propagation, crystallographic paths are formed while surface cracks propagate in mode I. The crack growth rate of internal cracks is much smaller than that of cracks propagating from the free surface