Dissertations / Theses on the topic 'Aeronautical Transportation'
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Carvalho, Jeferson Dutra de. "Definição do modal de transporte ótimo para componentes comprados numa empresa aeronáutica brasileira." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3148/tde-19092006-090138/.
Full textThe present paper aims to define an optimum modal of transportation for acquired components used to supply the production line in a Aeronautical Company, based on the lowest logistic cost. Due to the caracteristics of such material and the special requirements of the Governamental agencies as well as the specific agencies that rule the aeronautical industrial environment, the suppliers which are in its vast majority of this net are from abroad. It happens due to the fact that the local Industry do not hold the required certification to manufacture or assemble such materials which throws the costs and its complexity much more present. Some few isolated companies constitute a exception of this general frame. Based on the exposed, to achieve the proposed goal a heuristic model was used, which defines that the best modal of transportation to transport those specific materials from its origin, USA or Europe, to your final destination in Brazil.
Taylor, Christine P. (Christine Pia) 1979. "Integrated transportation system design optimization." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38644.
Full textIncludes bibliographical references (p. 173-178).
Traditionally, the design of a transportation system has focused on either the vehicle design or the network flow, assuming the other as given. However, to define a system level architecture for a transportation system, it is advantageous to expand the system boundary during the design process to include the network definition, the vehicle specifications, and the operations, which couple the vehicle(s) and the network. The integrated transportation system formulation developed in this thesis examines these fundamental components by classifying the decisions required to define them and concurrently optimizing the entire design problem, resulting in a more efficient transportation architecture. The integrated transportation system design models are developed for an air and a space transportation system and an example problem is implemented for each. The integrated air transportation system example of an overnight package delivery network quantifies at least a ten percent improvement in cost over traditional optimization approaches. The formulation for a space transportation system first requires the definition of a space network which is constructed by extending time expanded networks to account for astrodynamic relationships.
(cont.) An Earth-Moon logistics supply example quantifies a 19 percent improvement in total mass in Low Earth Orbit as compared to traditional optimization methods. The improvements in system objective values obtained can be attributed to the reduction in operational inefficiencies for the transportation system. The concurrent optimization of the integrated transportation system design problem employs a new methodology, embedded optimization, to obtain solutions. Embedded optimization allows Simulated Annealing to effectively find good solutions to highly constrained problems by embedding deterministic solvers, such as linear or mixed integer programs, into the perturbation step. Comparing the solutions and computational performance of SA with and without embedded optimization reveals that embedded optimization performs significantly better, with 95 percent confidence.
by Christine Taylor.
Ph.D.
Withers, Mitch Russell. "Environmental and economic assessment of alternative transportation fuels." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90808.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 56-63).
Alternative fuels have the potential to mitigate transportation's impact on the environment and enhance energy security. In this work, we investigate two alternative fuels: liquefied natural gas (LNG) as an aviation fuel, and middle distillate fuel derived from woody biomass for use in aviation or road transport. The use of LNG as a supplemental aircraft fuel is considered in the context of the Lockheed Martin C- 1 30H and C-130J transport aircraft. We estimate the cost of retrofitting these aircraft to use LNG and the savings from reduced fuel expenses. We evaluate the societal impacts of LNG within a cost-benefit framework, taking into account resource consumption, human health impacts related to air quality, and climate damage. We find that aircraft operators can save up to 14% on fuel expenses (retrofit costs included) by employing LNG retrofits, with a 95% confidence interval of 2-23%. Society can also benefit by 12% (3-20%) from LNG use as a result of improved surface air quality, lower resource consumption, and climate neutrality relative to conventional fuel. These results are highly dependent on fuel prices, the quantity and cost of the LNG retrofits, and the frequency and length of missions. Woody biomass harvested from old-growth forests produces a large carbon debt when used as a feedstock for transportation fuel. Managed forests are an attractive alternative for inexpensive biomass production with the potential to reduce this carbon debt. We study the effect of forest management practices on the carbon debt payback time resulting from harvesting woody biomass from managed forests for middle distillate fuel production. We also calculate the breakeven time in terms of radiative forcing, temperature change, and economic damages. We find that biofuels produced over a period of 30 years have higher CO 2 emissions than fossil fuels for 59 years, higher radiative forcing for 42 years, higher temperature change for 48 years, and higher cumulative discounted (1-2%) economic damages for more than 100 years. These damages never break even at discount rates above 2%. Payback times can be reduced by increasing the age at which biomass is harvested. When biofuel production is sustained indefinitely, greater climate benefits are achieved over the next 100 years by instead producing long-lived wood products like lumber.
by Mitch Russell Withers.
S.M.
Treleaven, Kyle (Kyle Ballantyne). "Probabilistic on-line transportation problems with carrying-capacity constraints." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90730.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 175-184).
This thesis presents new insights and techniques for the analysis and design of autonomous or technology-assisted ("intelligent") transportation systems. The focus is on cooperative, on-line planning and control, of a fleet of transport vehicles with limited carrying capacity, where new transportation demands enter the system in real time. The study extends an existing probabilistic framework which has provided numerous insights about vehicle scheduling and routing problems since its inception. Additionally, the thesis provides algorithms and new probabilistic cost bounds, for optimal bipartite matchings between large sets of random points and optimal stacker crane tours through large sets of random demands. A recurrent theme of the thesis is that capacity-constrained vehicles must drive passenger-less, inescapably, for some positive fraction of time (in almost any practical setting). Moreover, under probabilistic modelling for the uncertainty of demand, one can predict the aforementioned fraction precisely, using strong Laws of Large Numbers arguments; it relates to a quantity known as the Earth Mover's distance (EMD), described by a fundamental problem in transportation theory. Since the existence of an unavoidable extra cost term has significant implications, e.g., for operational budgets of shared-vehicle systems, the results illuminate a phenomenon whose neglect could prove an unfortunate oversight. To the author's knowledge, this connection of the EMD to on-line vehicle routing is novel. The thesis also provides a new study of the practical considerations imposed by the "street rules" ubiquitous among ground-based transport problems. A new efficient algorithm for the Bipartite Matching problem for points on a roadmap is given. Also given is a new explicit formulation of the EMD on road networks; very few explicit formulas for EMDs have been known previously.
by Kyle Treleaven.
Ph. D.
Caiazzo, Fabio. "Non-CO₂ environmental impacts of transportation fuel use and production." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101491.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 154-165).
Transportation represents one of the largest contributors to anthropogenic air pollution and global climate change. This thesis aims to quantify three specific environmental impacts from transportation fuel combustion and production: 1) Health impacts from transportation combustion emissions in the United States. A multiscale air quality model is applied to assess health impacts from PM 2.5 and ozone concentrations attributable to different transportation modes and other sectors in the U.S. Road transportation is found to be the largest contributor for both pollutant-related mortalities, causing overall 58,000 (90% Cl: 22,800 107,100) early deaths per year. Shipping accounts for 8,800 (90% Cl: 3,700 - 16,100) premature mortalities per year, and rail transportation for 5,000 (90% Cl: 1,900 - 9,300) early deaths. Aviation emissions are responsible for 2,500 (90% Cl: 1,400 - 3,700) early deaths per year in the U.S. 2) Climate effects of albedo changes due to biofuel production. An augmented lifecycle framework is developed to quantify the effects of albedo variations induced by biomass cultivation, and applied to eleven land-use change (LUC) scenarios. Two scenarios are found to have a warming effect, the largest of which is for replacement of desert land with salicornia cultivation. This corresponds to 222 gCO₂e/MJ, equivalent to 3890% and 247% of the lifecycle greenhouse gas (GHG) emissions of fuels derived from salicornia and crude oil, respectively. Nine LUC scenarios exhibit a cooling effect, the largest of which is for the replacement of tropical rainforest with soybean cultivation. This corresponds to -161 gCO₂e/MJ, or -28% and -178% of the lifecycle GHG emissions of fuels derived from soybean and crude oil. 3) Climate impacts from changes in radiative forcing (RF) generated by contrails and contrail cirrus in the scenario of a widespread use of alternative jet fuels in the U.S. The Contrail Evolution and Radiation Model (CERM) is developed to simulate contrail and contrail cirrus cover, properties and radiative forcing over the United States. The results show that the use of alternative jet fuels in the U.S. generates 8% more contrails with respect to conventional jet fuels, due to the enhanced engine water vapor emissions. Contrails from alternative fuels are optically thinner (-35% in optical depth), and formed by larger and fewer ice crystals (+58% in diameter and -73% in number concentration), due to the lower emissions. These differences are responsible for a lower albedo (-36%) from contrails forming as a consequence of alternative fuels emissions. The cooling impact of having optically thinner contrails and is contrasted by the warming effects of having contrails less reflective of the incoming sunlight and in larger number, thus determining a small difference (+0.6%) in the net RF by contrails and contrail cirrus in case of alternative fuels use with respect to conventional jet use. CERM simulations are also performed to quantify for the first time impacts on contrails and contrail cirrus radiative impacts of both combustor technology and ambient conditions, in terms of available concentrations ice nuclei (IN). The results of this thesis offer new insights into the environmental impacts of transportation. The air quality and climate impacts of this sector can be potentially reduced by fostering the use of alternative fuels, but only when previously overlooked effects (such as changes in surface albedo for biofuel production, or ambient concentrations of ice nuclei affecting contrail properties) are taken into account.
by Fabio Caiazzo.
Ph. D.
Boteva, Meglena. "A new century and a new attitude towards safety oversight in air transportation /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31151.
Full textBy signing the Chicago Convention on International Civil Aviation of 1944, all 185 Contracting States agreed to certain principles and arrangements in order that international civil aviation could be developed in a safe and orderly manner. They undertook, inter alia, to collaborate in securing the highest practicable degree of uniformity in all matters in which such uniformity could facilitate and improve air navigation. Thus, they all agreed to a common purpose and to the means for ensuring it.
With the presence of several regulatory levels, namely, national, regional and international, and given the challenges of the new century in parallel with the increased sophistication of civil aviation systems, safety in air transportation requires that it be a shared responsibility. (Abstract shortened by UMI.)
Bartlik, Martin. "The impact of EU law on the regulation of international air transportation /." Aldershot : Ashgate, 2007. http://aleph.unisg.ch/hsgscan/hm00245074.pdf.
Full textSuresh, Pooja. "Environmental and economic assessment of transportation fuels from municipal solid waste." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105567.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 76-86).
Municipal solid waste (MSW), comprising food waste, residential rubbish and commercial waste, has been identified as a potential feedstock for the production of alternative fuels. Conversion of MSW to fuel could displace petroleum-derived fuels to mitigate greenhouse gas (GHG) emissions from transportation, and also avoid the GHG emissions associated with existing waste management strategies such as landfilling. This thesis quantifies the lifecycle GHG emissions and economic feasibility of middle distillate (MD) fuel, including diesel and jet fuel, derived from MSW in the United States via three thermochemical conversion pathways: conventional gasification and Fischer-Tropsch (FT MD), plasma gasification and Fischer-Tropsch (Plasma FT MD) and, conventional gasification, catalytic alcohol synthesis and alcohol-to-jet upgrading (ATJ MD). Expanded system boundaries are used to capture the change in existing MSW use and disposal, and parameter uncertainty is accounted for with Monte Carlo simulations. The median lifecycle GHG emissions are calculated to be 32.9, 62.3 and 52.7 gCO2e/MJ with standard deviations of 7.2, 9.5 and 13.2 gCO2e/MJ for FT, Plasma FT and ATJ MD fuels, respectively, compared to a baseline of 90 gCO2e/MJ for conventional MD fuels. These results are found to be sensitive to MSW composition, the waste management strategy displaced, plant scale and associated fuel yield, feedstock transportation distance and the co-product allocation method. Median minimum selling prices are estimated at 0.99, 1.78 and 1.20 $ per litre and standard deviations of 0.14, 0.29 and 0.27 $ per litre with the probability of achieving a positive net present value of fuel production at market prices of 14%, 0.1% and 7% for FT, Plasma FT and ATJ MD fuels, respectively. The sensitivity of these results to the discount rate, income tax rate, implementation of carbon price, feedstock cost, scale and process efficiency indicate that policy measures, MSW tipping fees and technological advancements can improve the economic viability of MSW fuels. Considering a societal perspective (e.g. social opportunity cost of capital, social costs of GHG emissions) increases the probability of positive net present value of fuel production to 93%, 67% and 92.5% for the FT, Plasma FT, and ATJ MD fuels, respectively.
by Pooja Suresh.
S.M.
Wickham, Richard Robert. "Evaluation of forecasting techniques for short-term demand of air transportation." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11584.
Full textIshutkina, Mariya A. (Mariya Aleksandrovna). "Analysis of the interaction between air transportation and economic activity : a worldwide perspective." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/49882.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 303-313).
Air transportation usage and economic activity are interdependent. Air transportation provides employment and enables certain economic activities which are dependent on the availability of air transportation services. The economy, in turn, drives the demand for air transportation services resulting in the feedback relationship between the two. The objective of this work is to contribute to the understanding of the relationship between air transportation and economic activity. More specifically, this work seeks to (1) develop a feedback model to describe the relationship between air transportation and economic activity and (2) identify factors which stimulate or suppress air transportation development. To achieve these objectives this work uses an exploratory research method which combines literature review, aggregate data and case study analyses. First, this work uses data at the individual country level to identify different types of growth patterns between air transportation passengers and GDP for 139 countries. This analysis is then used to identify twenty-two representative countries which span a range of possible interaction behaviors, geographies and income categories. The case study analysis at the individual country level is performed to describe the air transportation impact for each individual economy. These findings help develop a feedback model which describes the relationship between air transportation and economic activity.
(cont.) Specifically, the analysis is used to describe (1) how air transportation flows of passengers and cargo enable the flows of goods, services, knowledge, tourism, investment, remittances and labor among economies and (2) how air transportation flows can affect the country's factor, demand and business conditions. The feedback model is then extended to perform quantitative analysis of the evolution of the enabling impact of air transportation in a particular economy. Specifically, a quantitative system dynamics model is developed to describe the interaction between the demand for leisure travel and the resulting enabling impact of tourism on Jamaica's economy. Case study analysis is also used to identify factors which may stimulate or suppress air transportation system development. The factors are identified both from the air transportation supply and demand sides. The following supply side change factors are identified: changes in the regulatory framework, infrastructure capability, vehicle capability and airline strategy. The air transportation demand is found to be directly affected by exogenous demand shocks, economic downturns, political and economic sanctions, and the development of other transportation modes. The analysis also identifies the following change factors which affect the demand indirectly by changing the country's economic attributes: economic liberalization, institutional and political reforms, supporting infrastructure investment, exchange rate fluctuations, political and macroeconomic stability, growing consumer demand, and changes in management practices.
(cont.) This analysis of stimulating and suppressing factors helps to describe the role of government intervention in changing air transportation system development and its impact on economic activity. The results of this work can help guide further development efforts, investment and policy decisions pertaining to air transportation usage especially in developing economies.
by Mariya A. Ishutkina.
Ph.D.
Sgoutas, Konstantinos. "Effectiveness of electric vehicles vs. vehicle technologies : a case study in environmental transportation policy." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/46448.
Full textOno, Masahiro S. M. Massachusetts Institute of Technology. "Experimental validation of the efficient robotic transportation algorithm for large-scale flexible space structures." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42199.
Full textIncludes bibliographical references (p. 77-79).
A new large space structure transportation method proposed recently is modified and experimentally validated. The proposed method is to use space robots' manipulators to control the vibration, instead of their reaction jets. It requires less fuel than the reaction jet-based vibration control methods, and enables quick damping of the vibration. The key idea of this work is to use the decoupled controller, which controls the vibration mode and rigid body mode independently. The performance of the proposed method and the control algorithm is demonstrated and quantitatively evaluated by both simulation and experiments.
by Masahiro Ono.
S.M.
Jensen, Luke L. "Data-driven flight procedure simulation and noise analysis in a large-scale air transportation system." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119288.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 227-234).
Aircraft noise is a growing source of community concern around airports. Despite the introduction of quieter aircraft, increased precision of onboard guidance systems has resulted in new noise impacts driven by overflight frequency effects. Noise issues present a potential barrier to the continued rollout of advanced operational procedures in the US. This thesis presents a data-driven approach to simulating and communicating noise effects in the flight procedure development and modernization process, with input from multiple stakeholders with varying objectives that are technical, operational, and political in nature. First, a system-level framework is introduced for developing novel noise-reducing arrival and departure flight procedures, clarifying the role of the analyst given diverse stakeholder objectives. The framework includes relationships between baseline impact assessment, community negotiation, iterative flight procedure development, and formal implementation processes. Variability in stakeholder objectives suggests a need to incorporate noise issues in conjunction with other key operational objectives as part of larger-scale US air transportation system modernization. As part of this framework development, an airport-level noise modeling method is developed to enable rapid exposure and impact analysis for system-level evaluation of advanced operational procedures. The modeling method and framework are demonstrated by evaluating potential benefits of specific advanced procedures at 35 major airports in the US National Airspace System, including Performance Based Navigation guidance and a speed-managed departure concept.
by Luke L. Jensen.
Ph. D.
Miller, Bruno 1974. "A generalized real options methodology for evaluating investments under uncertainty with application to air transportation." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32468.
Full textIncludes bibliographical references (p. 194-198).
Real options analysis is being increasingly used as a tool to evaluate investments under uncertainty; however, traditional real options methodologies have some shortcomings that limit their utility, such as the use of the geometric Brownian motion to model the value of the underlying asset and the assumption of a fixed cost to exercise the option. In this thesis, an alternative real options methodology is developed that overcomes some of the difficulties of traditional approaches. In particular, the methodology proposed here presents an analytical framework that allows the value of completion and the strategy- enabling completion cost (commonly referred to as stock price and strike price in the real options literature, respectively) to be represented by any probability distribution. If these probability distributions can be described analytically, an exact solution to the real options valuation problem can be found. Otherwise, the probability distributions can be generated with numerical simulation (e.g. Monte Carlo simulation), and the answer can then be found numerically. This generalized methodology combines the simplicity of analytical approaches with the flexibility to represent completion costs and the value of completion with any probability distribution. The generalized real options methodology is illustrated with an example from aviation: the decision to launch a new aircraft development program. This type of investment is suitable for real options analysis because of the many uncertainties involved, the long- term nature of the project, and the ability of management to act and influence the project as uncertainties are resolved during its evolution.
(cont.) The analysis shows that investors can use the numerical results of the real options evaluation to determine the investment limits on the different stages of the aircraft program, that managers can use insights from the real options approach to restructure the program to improve the financial feasibility of the project, and that both investors and managers can use the output of derivative analyses to define minimum requirements (in terms of aircraft orders) to ensure program success.
by Bruno Miller.
Ph.D.
Yutko, Brian M. (Brian Matthew). "The impact of aircraft design reference mission on fuel efficiency in the air transportation system." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/87482.
Full textCataloged from PDF version of thesis. "October 2013."
Includes bibliographical references (pages 153-157).
Existing commercial aircraft are designed for high mission flexibility, which results in decreased fuel efficiency throughout the operational life of an aircraft. The objective of this research is to quantify the impact of this practice and other non-optimal emergent behaviors of the current global air transportation system. The analysis focuses on improvements that can be made using existing technology. Previous attempts at performing this type of analysis, especially the joint optimization of aircraft design and operations, have been hindered by problem complexity and computational time. In order to overcome these issues and perform the analysis on a global scale, a machine-learning algorithm is used to create a computationally efficient artificial neural network relating aircraft design and off-design mission performance to operational fuel burn and flight time. The data used to train the aircraft performance neural network is generated from an extensive sample of new vehicles optimized for minimum fuel burn on an extremely broad combination of Design Reference Missions (design-payload, -range, and cruise Mach). The resulting comprehensive model of aircraft performance is capable of solving large-scale air transportation network optimization problems. A set of scenarios is analyzed to both establish the limits of the major contributors to system fuel consumption and determine potential realistic benefits from introducing new aircraft with varying design reference missions. Results indicate that approximately 33% of current system fuel consumption is due to the slow retirement and replacement of aircraft in the operational fleet. Additionally, a significant pool of potential fuel burn savings can be realized by designing aircraft closer to their intended operating regime. Multiple large-scale optimization scenarios are presented, including the optimal choice of new aircraft designs for fixed cruise Mach numbers and the globally optimum aircraft choices given any cruise Mach. It is found that reducing design cruise speed can yield system fuel benefits on the order of 7%. Fuel stops are shown as a potentially promising method to operate long-haul missions closer to the maximum fuel efficiency range of an aircraft, and also as a way to mitigate the impact of designing high-efficiency, short-range aircraft that can no longer fly long haul missions directly.
by Brian Yutko.
Ph. D.
De, Serres Martine. "Environmental policymaking for air transportation : toward an emissions trading system." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112600.
Full textThis thesis is an attempt to determine the best possible course of action for the industry. To this end, it begins by assessing contemporary understanding of aviation's impact on the environment, and provides an overview of efforts being made toward reducing aircraft emissions. It then examines various policymaking tools available to best address the issue, concluding with an emissions trading system. Finally, design characteristics of such a system are suggested, and used to provide an analysis of the European attempt to include aviation into its own emissions trading system.
Yang, Eunsuk. "A design methodology for evolutionary air transportation networks." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29643.
Full textCommittee Chair: Mavris, Dimitri N.; Committee Member: Baik, Hojong; Committee Member: DeLaurentis, Daniel; Committee Member: Lewe, Jung-Ho; Committee Member: Schrage, Daniel. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Keysan, Gizem. "Tactical and operational planning for per-seat, on-demand air transportation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29730.
Full textCommittee Co-Chair: George L. Nemhauser; Committee Co-Chair: Martin W. P. Savelsbergh; Committee Member: Bruce K. Sawhill; Committee Member: Joel Sokol; Committee Member: Ozlem Ergun. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Hu, Xiaojie. "Technology transition in the national air transportation system : market failure and game theoretic analysis with application to ADS-B." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45218.
Full textIncludes bibliographical references (p. 103-105).
This research analyzes the problem of technology transition in the national air transportation system, focusing on the implementation of Automatic Dependent Surveillance-Broadcast (ADS-B). ADS-B is a key technology in the Federal Aviation Administration's plan to modernize the national civil air transportation surveillance system. Data regarding airline perception of benefits, barriers, and knowledge of ADS-B is presented. Market mechanisms that could potentially cause technology implementation failure are identified through game theoretic analysis of airline interview data. Potential market failures identified include public goods failures, cost-benefit asymmetries, information asymmetries, and risk dominance. Potential institutional failures identified include organizational process failures and bureaucratic interests and politics. Government action to correct market failures is explored. Government mechanisms to correct market failures include technology value, support infrastructure development, positive incentives, putative measures, and mandates.
by Xiaojie Hu.
S.M.
Weibel, Roland E. (Roland Everett). "Assuring safety through operational approval : challenges in assessing and approving the safety of systems-level changes in air transportation." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/62970.
Full text"September 2009." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 135-143).
To improve capacity and efficiency of the air transportation system, a number of new systems-level changes have been proposed. Key aspects of the proposed changes are combined functionality across technology and procedures and large physical scale of deployment. The objective of this work is to examine the current safety assessment processes for systems-level changes and to develop an understanding of key challenges and implications for the assessment and approval of future systems-level changes. From an investigation of current U.S. and international safety regulatory policies and processes, a general model was created describing key processes supporting operational approval. Within this model, a framework defined as an influence matrix was developed to analyze key decisions regarding the required scope of analysis in safety assessment. The influence matrix represents the expected change in levels of risk due to changes in behavior of elements of a system. It is used to evaluate the appropriate scope of analysis in safety assessment. Three approaches to performing safety assessment of systems-level changes were analyzed using the framework: the risk matrix approach, target level of safety approach, and performance-based approach. Case studies were performed using eight implemented and pending systems-level changes. In this work, challenges expected in safety assessment of future systems-level changes were identified. Challenges include the large scope of proposed changes, which drives a need for a broad and deep scope of analysis, including the multiple hazards and conditions and complex interactions between components of a change and the external system. In addition, it can be expected that high safety expectations will increase the required accuracy of models and underlying data used in safety assessment. Fundamentally new operational concepts are also expected to expand the required scope of safety assessment, and a need to interface with legacy systems will limit achievable operations. The large scope of analysis expected for future changes will require new methods to manage scope of safety assessment, and insights into potential approaches are discussed.
by Roland Everett Weibel.
Ph.D.
Dunn, Nicholas (Nicholas S. ). "Analysis of urban air transportation operational constraints and customer value attributes." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117987.
Full textThesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, in conjunction with the Leaders for Global Operations Program at MIT, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 87-88).
Urban Air Mobility (UAM) is a concept that proposes to provide short-range transportation solutions that enable customers to travel point-to-point more quickly than they can today using cars or public transportation. The concept of Urban Air Mobility is not new, but there has been rapidly increasing interest in providing air transportation services within major metropolitan areas. The combination of increasing congestion and advancements in electric aircraft and automation makes the Urban Air Mobility market more attractive for vehicle manufactures and transportation companies. There are many potential applications for new aircraft. However, these applications cannot be based solely on what is technological feasible, but must consider the market, demand, and customer needs. This thesis investigates these factors in order to identify operational challenges that may develop during the implementation and operation of an Urban Air Mobility system. The study focuses on Dallas-Fort Worth to set the scope to one potential early adoption market. The objective is to understand the Dallas-Fort Worth environment better in two dimensions. The first is resident's current perceptions and values. The second is the operational challenges and constraints associated with operating a UAM system. In order to meet this objective, a survey of community members and potential early adopters is conducted to determine customer's perceptions of a UAM system and identify operational challenges that may develop based on customer needs. Next, a case study is completed using 10 reference missions in the Dallas-Fort Worth metropolitan area. The missions represented potential commuter trips, point-to-point trips like sporting events, and randomly generated missions. Through this case study, nineteen operational challenges are identified that may impact the development, implementation, and operation of an Urban Air Mobility system. After reviewing each reference mission, community acceptance of aircraft noise and take off and landing area availability were identified as the operational constraints likely to cause the greatest challenges for UAM operations in Dallas Fort Worth.
by Nicholas Dunn.
M.B.A.
S.M.
Mahapatra, Subrat. "Analysis of routing strategies in air transportation networks for express package delivery services." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2688.
Full textThesis research directed by: Civil Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Lim, Choon Giap. "An integrative assessment of the commercial air transportation system via adaptive agents." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26541.
Full textCommittee Chair: Dimitri Mavris; Committee Member: Daniel Schrage; Committee Member: Hojong Baik; Committee Member: Jung-Ho Lewe; Committee Member: Kurt Neitzke. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Ide, Yoshinori. "Liberalization of international air transport in the Japan-US market." Thesis, McGill University, 1998. http://catalog.hathitrust.org/api/volumes/oclc/47189948.html.
Full textSmith, Catherine E. "Glass Cockpit Transition Training in Collegiate Aviation: Analog to Digital." Bowling Green, Ohio : Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1225479328.
Full textWon, Henry Thome. "A system-of-systems modeling methodology for strategic general aviation design decision-making." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26469.
Full textCommittee Chair: Mavris, Dimitri; Committee Member: Gallman, John; Committee Member: Lewe, Jung-Ho; Committee Member: Schrage, Daniel; Committee Member: Upton, Eric. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Scheving, Thorsteinsson Astridur. "State aid to airlines." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64301.pdf.
Full textJimenez, Hernando. "A strategic planning approach for the operational-environmental problem of air transportation system terminal areas." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31761.
Full textCommittee Member: Dr. Fayette Collier; Committee Member: Prof. Daniel Schrage; Committee Member: Prof. Dimitri N. Mavris; Committee Member: Prof. John Leonard; Committee Member: Prof. John-Paul Clarke. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Lewe, Jung-Ho. "An Integrated Decision-Making Framework for Transportation Architectures: Application to Aviation Systems Design." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-04132005-204114/unrestricted/Jung-Ho%5FLewe%5F200505%5Fphd.pdf.
Full textAmy R. Pritchett, Committee Member ; Moore, Mark D., Committee Member ; Wilhite, Alan, Committee Member ; Schrage, Daniel P., Committee Chair ; Mavris, Dimitri N., Committee Co-Chair ; DeLaurentis, Daniel A., Committee Member. Vita. Includes bibliographical references.
Monteiro, Luis António Domingos Fernandes. "The strategic use of information in the airline industry." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/2549/.
Full textOliveira, Alessandro V. M. "Three essays on competition in airline markets with recent liberalisation." Thesis, University of Warwick, 2004. http://wrap.warwick.ac.uk/2627/.
Full textQuinn, Andrew. "The ventilation of a chick transport vehicle." Thesis, University of Nottingham, 1996. http://eprints.nottingham.ac.uk/52203/.
Full textKumar, Ravindra. "Modelling motorcycles driving cycles and emissions in Edinburgh." Thesis, Edinburgh Napier University, 2009. http://researchrepository.napier.ac.uk/Output/3047.
Full textPinon, Olivia Julie. "A methodology for the valuation and selection of adaptable technology portfolios and its application to small and medium airports." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43632.
Full textLamy, Christophe A. "The technical boards of aircraft accident investigation in the United States of America & France /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33065.
Full textTo fulfil their complex mission in the best possible conditions and despite eventual pecuniary constraints, the pressure of the media, or the occasional tensions which may arise in case of concomitance with other investigations, the NTSB and the BEA rely on the renowned professionalism and high technical skills of their employees as well as on the participation in the investigation of members of the aeronautical industry who bring their expertise and contribute to the improvement of air safety.
Balasubramaniam, Usha. "Passengers' protection and rights in international civil aviation." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112598.
Full textCurrently, the international civil aviation community is faced with many challenges evolving from globalization, liberalization of economic regulations, privatization of airlines and airports, commercialization of government services providers, increasing environmental controls, and the emerge of new technologies. To deal effectively with these challenges and issues will require a high level of cooperation among civil aviation authorities, airlines, airports, and providers of air services and products. Airlines under the new free trade regimes have been exposed to many changes and although GATS has an important role to play in this important field, the convergence of economic, safety, security and environmental issues makes a strong case for keeping regulation in these critical issues under the ICAO aviation umbrella.
As air transport experiences structural, policy and regulatory environment changes, in the era of free trade it would be interesting to critically examine the impact of the aforementioned changes on the rights and protection of passengers. In this relation, it becomes very important to review the international, regional, and national efforts which have been made to enhance consumer protection and also have an important bearing on the rights of airline passengers. The thesis also addresses some emerging, non-traditional consumer protection issues, such as health, racial discrimination and the rights of disabled passengers.
In view of the above, the well-developed consumer protection regimes in the United States and the European Union (EU) would be examined in depth and the results of its analysis would be used to develop a suitable model airline passenger protection in the rapidly expending economies of the Asia and Pacific Region.
Robeson, Isaac J. "A departure regulator for closely spaced parallel runways." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42783.
Full textNunes, Paulo. "Holistic risk management in commercial air transport : a methodology to apply ISO 31000 to the airline industry." Thesis, City University London, 2015. http://openaccess.city.ac.uk/13571/.
Full textDobruszkes, Frédéric. "Géographie de la libéralisation du transport aérien passagers en Europe." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210715.
Full textLa libéralisation du ciel européen a effectivement conduit à soumettre l’essentiel de l’offre intra-européenne aux « lois du marché », les services publics étant devenus résiduels (moins de 5% des sièges intra-européens). Pour autant, la concurrence à l’échelle des lignes n’est pas devenue la norme. Elle a certes aug-menté, en particulier sur des grandes lignes domesti-ques jadis très protégées, sur les principales lignes européennes entre régions métropolitaines et sur les lignes nord – sud à vocation touristique. Cependant, le développement de nombreuses nouvelles lignes exploi-tées par une seule compagnie a paradoxalement aug-menté le nombre et la part des monopoles de fait. De nombreuses concurrences n’ont lieu qu’indirectement, soit au travers de filiales étrangères (par exemple Spa-nair appartenant à SAS), soit par des compagnies low-cost opérant depuis des aéroports secondaires plus éloignés des grandes agglomérations européennes (par exemple Hahn au lieu de Francfort).
Entre 1991 et 2005, la desserte de l’espace européen libéralisé connaît d’importantes évolutions. D’une part, le volume de l’offre (en sièges) est presque multiplié par deux (+85%, +81% si l’on se limite aux vols intra-européens), soit un taux de croissance annuel moyen de 5,6%. Cette croissance concerne plus l’offre interna-tionale que nationale, qui l’emporte maintenant sur la seconde. D’autre part, la dynamique d’ouverture et de fermeture de lignes est spectaculaire :1308 créations contre 459 disparitions, si bien que le nombre total de lignes a augmenté de moitié et que le réseau européen actuel est un réseau pour moitié renouvelé par rapport à celui de 1991. Cependant, le poids en sièges des lignes héritées est de 8/10. Le réseau européen actuel est donc quantitativement toujours dominé par les relations historiques, qui constituent l’armature de la desserte aérienne européenne.
Les espaces touristiques balnéaires méridionaux ont capté une grande partie de cette croissance (3/10 des nouvelles liaisons, ¼ de l’augmentation générale du nombre de sièges). Si l’on y ajoute le tourisme urbain, on observe très clairement une banalisation du tou-risme aérien.
Une typologie évolutive des réseaux à l’échelle des compagnies a révélé des stratégies différenciées et donc des impacts variés en termes de desserte des territoires. Les grandes compagnies nationales ont généralement fortement développé leur offre tout en la concentrant plus encore sur leurs bases aéroportuaires traditionnelles organisées en hubs. Parfois, un second hub a dû être créé pour contourner des problèmes de saturation (Munich en plus de Francfort) ou mieux coller à la demande (Milan en plus de Rome). Les compagnies classiques ont aussi pris des participations dans des petites compagnies afin de pénétrer plus facilement, et à moindre coût, des marchés étrangers. Ces filiales — et leurs réseaux — ont parfois été converties en opéra-teurs régionaux alimentant les grands hubs. Par ail-leurs, diverses petites compagnies ont pu se développer à l’échelle européenne, sortant souvent de leur cadre national classique. Ces développements se sont tantôt faits au bénéfice des villes « de province » (en particu-lier en Grande-Bretagne), tantôt par concentration sur la capitale (en particulier dans les pays où les villes de province ont peu de poids économique et démographi-que). Enfin, des compagnies charters ont transformé leur offre en offre régulière, la rendant plus ouverte au public, au profit des zones touristiques méridionales qui sont ainsi plus facilement accessibles.
Mais la plus spectaculaire évolution est sans doute le développement des compagnies low-cost. Celles-ci sont responsables de 4/10 de la croissance de l’offre (en sièges) sur la période 1995-2004 ;elles sont aussi mêlées à 3/10 des nouvelles lignes européennes ouver-tes entre 1991 et 2005. Leurs réseaux renforcent les liaisons entre régions métropolitaines et entre celles-ci et les destinations touristiques. En outre, les régions subcentrales leur doivent la moitié de leur desserte et presque toute leur croissance. De nombreux petits aéroports leur doivent l’essentiel, voire la totalité, de leur desserte et de leur croissance, en particulier dans les régions subcentrales et intermédiaires. Ceci a consi-dérablement modifié les rapports entre compagnies et gestionnaires d’aéroports, plaçant ces derniers dans un rapport de forces qui ne leur est pas toujours favorable.
Ces dynamiques viendraient presque faire oublier les décroissances. D’une part, des faillites ont parfois eu un effet négatif marqué sur la desserte des villes, comme nous l’avons en particulier montré pour Bruxelles avec la faillite de la Sabena. D’autre part, les services publics subventionnés semblent être en régression, bien que l’analyse détaillée du cas français montre que la géo-graphie des services publics antérieurs à la libéralisation découlait parfois plus d’exigences politiques locales que de besoins réels.
A l’échelle régionale, l’analyse des évolutions par types économiques régionaux montre qu’au-delà de taux de croissance très variés et malgré toutes les dynamiques étudiées, la répartition de l’offre est demeurée assez constante :il n’y a pas de remise en cause de la hiérar-chisation de l’espace européen. Les régions métropoli-taines continuent en effet à polariser une très grande partie de l’offre et sont toujours les points de passage quasi-obligés pour les vols intercontinentaux. Un niveau en dessous, les régions centrales disposent toujours d’une offe honorable, quoique limitée à l’Europe et ses marges. Les régions subcentrales profitent d’une « décompression » des régions métropolitaines et cen-trales et de la dynamique low-cost. Les capitales des pays ex-communistes connaissent un rattrapage et sont repolarisées par l’Europe occidentale. Les périphéries touristiques connaissent un important développement mais pèsent peu globalement. Les autres périphéries et les espaces intermédiaires tendent à se marginaliser, victimes de trop faibles densités économiques et démo-graphiques et d’une contraction des services publics aériens.
Enfin, si le développement de lignes transversales entre petites villes est une réalité, leur poids est avant tout local. Celles-ci pèsent en effet peu globalement.
Doctorat en sciences, Spécialisation géographie
info:eu-repo/semantics/nonPublished
Anza, Inigo. "Synthesis of Aluminum-Titanium Carbide Nanocomposites by the Rotating Impeller Gas-Liquid In-situ Method." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-dissertations/376.
Full textGregorian, Hayk. "Air Transport versus High-Speed Rail: From Physics to Economics." Bachelor's thesis, Aircraft Design and Systems Group (AERO), Department of Automotive and Aeronautical Engineering, Hamburg University of Applied Sciences, 2019. http://d-nb.info/1184074658.
Full textMcCulloch, Kirsty Anita. "Evaluation of fatigue management systems in the Australian transport industry." 2006. http://arrow.unisa.edu.au:8081/1959.8/46375.
Full textGreenberg, Reuven. "A quantitative safety model of systems subject to low probability high consequence accidents." 2007. http://arrow.unisa.edu.au:8081/1959.8/34060.
Full textMutapanduwa, Simbarashe Morgan. "Assessment of the contributions of air transportation in stimulating local economic development in Vhembe District." Diss., 2016. http://hdl.handle.net/11602/376.
Full textJohnson, Donovan Theodore. "The metallic elephant in the room : short range flights, high-speed rail, and the environment." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3303.
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