Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 53 for “"aircraft engines"”.
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Waste heat reclamation in aircraft engines
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
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Scaling considerations for small aircraft engines
Small aircraft engines traditionally have poorer performance compared to larger engines, which until recently, has been a factor that outweighed the aerodynamic benefits of commoditized and distributed propulsion. Improvements in the performance of small engines have, however, prompted another look …
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The automatic synchronization of multiple aircraft engines
Thesis (B.S.)-- Massachusetts Institute of Technology, Dept. of General Engineering, 1938.
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Marketing strategy for commercial aircraft engines : a case study
Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1989.
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Impact of Water Injection on Emissions of Nitrogen Oxides from Aircraft Engines
Aircraft NOₓ emissions form as a result of high-temperature combustion in the engine, and they lead to negative climate and air quality impacts. These emissions increase with temperature, so a NOₓ reduction technique has been proposed where water is injected in different regions of a gas turbine …
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Designing for reliability, maintainability, and sustainability (RM&S) in military jet fighter aircraft engines
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Modeling of particulate matter creation and evolution in aircraft engines, plumes and particle sampling systems
… to characterize the exhaust gas composition of aircraft engines. Besides major chemical species (N₂, 0₂, C0₂ and H₂0), aircraft engines also emit other species in much lower concentrations but that may also have significant impacts. Particulate Matter (PM) belongs to this category. This thesis …
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L1 Adaptive Control of Uncertain Nonlinear Systems with Dynamic Constraints: As Applied to Commercial Aircraft Engines
<p>L1 adaptive control for a turbofan commercial aircraft engine is developed and applied in the presences of constraint limits. Turbofan engines are a highly complex system, with a wide variety of dynamics, operating under constantly changing environmental conditions. In aircraft turbofan …
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Data-Driven Modeling of Tracked Order Vibration in Turbofan Engine
Aircraft engines are one of the most heavily instrumented parts of an aircraft, and the data from various types of instrumentation across these engines are continuously monitored both offline and online for potential anomalies. Vibration monitoring in aircraft engines is traditionally performed …
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A numerical investigation into the tactical advantages of supercruise for combat aircraft
… advantages offered by upgrading a hypothetical aircraft with a newer engine model. The airframe is largely based on the Dassault Mirage III, and the engines are based on the SNECMA Atar 9k50 and M53. A brief overview of recent developments in combat aircraft design and engine performance is …
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The Numerical Investigation of the Effects of Sand Ingestion on Compressor Blade Erosion
The performance of aircraft engines can be significantly affected by the variety of foreign particles that are mixed into the air while operating under miscellaneous conditions. In particular, aircraft engines that operate in sandy or dusty conditions may fail within minutes of exposure to …
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The Perception of Travel Agents as to Passenger Acceptance of the High Speed Civil Transport in Commercial Airline Service: A Study of Tomorrow's Transpacific Air Travel
… NASA, Boeing Commercial Airplane Group, Douglas Aircraft Company, GE Aircraft Engines, and Pratt & Whitney, technology for a new-generation supersonic transport aircraft is being developed. To determine if air travelers will choose this aircraft, the High Speed Civil Transport (HSCT), as their …
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Stochastic Methods for Setting Effective Aviation NOₓ Policies
… airports. As part of the regulation process, aircraft engines are placed on a test stand with NOₓ levels measured at different thrust settings meant to mimic the aircraft’s emissions during landing and take-off. These are then constrained as a function of the engine’s overall pressure ratio …
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System development technical interactions and innovation : a network-based investigation
… of complex engineering systems such as aircraft engines involves many cross functional teams that are usually geographically distributed. These teams interact in several ways but one of the most important set of interactions during the product development phase is the flow of technical …
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Applications of axial and radial compressor dynamic system modeling
… to experimental data obtained from the GE Aircraft Engines test program on compressor whirl. Previously outstanding whirl-instability issues are resolved, including prediction of the direction and magnitude of rotor whirl-inducing forces; such issues are important in the design of modern …
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Study of particulate matter formation and evolution in near-field aircraft plumes using a one-dimensional microphysical model
… the particulate matter (PM) emissions from aircraft engines. This thesis presents a one-dimensional microphysics and chemical kinetics model that is used to study the formation and evolution of particulate matter in near field aircraft plumes at ground level. The initial exhaust properties …
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Investigation of the Herschel-Quincke tube concept in a rectangular lined duct
… proposed for application in noise reduction of aircraft engines. The approach consists of installing Herschel-Quincke (HQ) tubes on lined rectangular ducts. An analytical model was developed to predict the effects of HQ tubes applied to rectangular lined ducts. The technique involves assuming …
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Aircraft based measurements of atmospheric Sulfur Dioxide and ground based measurements of gaseous Sulfur (VI) in the simulated internal flow of an aircraft engine: Implications for atmospheric aerosol formation
This dissertation is concerned with aircraft based measurements of sulfur dioxide in the atmosphere and gaseous sulfuric acid measurements in the internal flow of an aircraft gas turbine engine. Both trace gases promote the formation and growth of sulfate aerosol particles which play an important …
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Efeito de múltiplos ciclos de solubilização sub-solvus delta e envelhecimento na microestrutura e propriedades mecânicas da superliga 718
… to meet the requisites of components for aircraft engines, due to its excellent creep resistance up to 650°C. During the maintenance of the engines, the components can be submitted to successive repair procedures, however the mechanical properties can be estimated solely during the project …
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An experimental investigation of turbine blade tip heat transfer and tip gap flows in the supersonic regime
… with qualitative predictions performed at GE Aircraft Engines. The pressure distribution in the blade tip cavity of a grooved tip blade was found to vary little with either Mach number or tip gap height. The tip cavity pressure was, however, a strong function of location. The tip cavity …
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