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 21 for “"engine failure"”.
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Optimized Engine Out Procedures to Extend the Range of Jet Transport Airplanes
… purpose of this study was to develop optimum engine-out procedures for the Boeing 747 and 767 on extended flights that will increase the range of the aircraft in case of engine failure. Theory suggests that an optimum amount of bank angle that will minimize drag resulting from asymmetric …
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The Effects of Aircraft Certification Rules on General Aviation Accidents
… Loss of Control, Controlled Flight into Terrain, Engine Failure, and Structural Failure.</p> <p>Airworthiness certification categories represent a wide diversity of government oversight. Part 23 rules have evolved from the initial set of simpler design standards and have progressed into a …
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Evaluating Scenarios That Can Startle and Surprise Pilots
… had on commercial pilots with single and multiengine ratings. Surprise is defined here as something unexpected (e.g., engine failure), while startle is the associated exaggerated effect of an unexpected condition (e.g., thunder sound). Forty pilots were tested in a basic aviation training …
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An Alternative Method of Identification of a Failed Engine in Twin-Engine Propeller Aircraft
… revealed that wrong identification of a failed engine during flight is not an uncommon event in an aircraft cockpit. A number of fatal accidents in the past, including the recent TransAsia Flight 235 accident, resulted from engine misidentification. Most accidents of this type happened on …
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A novel measurment of net erosion and plasma-material interaction in plasma thrusters
… channel leading eventually to catastrophic engine failure. As erosion is the primary failure mode of these systems, understanding the erosion physics, plasma-material interactions (PMI), and the relationship between them is of utmost importance for extending the lifetime of high power and …
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Engine placement for manned descent at Mars considering single engine failures
… scale to large masses. The placement of these engines on a lander is subject to many concerns such as heat shield packing, cargo handling, and engine out mitigation. Engine out mitigation is of considerable interest because configurations that improve failure mitigation tend to be poorer for …
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Optical Field Instrumentation for Characterizing Particle Sampling Sensors
… like routine inspections and maintenance. The engine failure modes are dependent on particle composition, concentration, and size. Particles containing certain minerals tend to melt and stick to turbine blades, which is known as glazing. Alternatively, particles may erode blades from repeated …
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Effectiveness of adaptive flight planning in the occurrence of total loss of thrust due to bird strike
… percent of air travelers are transported on twin-engine jets. Although contemporary twin-engine jets are more reliable and efficient than yesterday’s three- and four-engine jets, they have reduced engine redundancy. A statistical analysis of the FAA Wildlife Strike Database shows that contemporary …
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Development of Diagnostic Tools for Use in a Gas Turbine Engine Undergoing Solid Particulate Ingestion
… air and subsequently ingested into the engine. Prolonged exposure to particle ingestion events leads to premature engine wear and, in extreme cases, rapid engine failure. Expanding our current understanding of these events is the first step to enabling engine manufacturers to mitigate …
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Analysis of carbonaceous solid deposits from thermal stressing of FAMEs and FAME/diesel blends at different temperatures in a continuous flow reactor
… deposits may form on vital parts of a vehicle's engine or fuel system such as the fuel injectors. Once these deposits have formed, they can block the spray holes of the injector and may also cause moving parts within the injector to stick. Diesel deposits can cause engine failure, engine …
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Investigation of alternative rotorcraft powerplant configurations for improving airframe performance
… increasing an aircraft's range. The helicopter's engine was the focus of this thesis, with emphasis on improving its specific power (power vs weight ratio), efficiency, performance in high altitude and temperature, or capabilities during engine failure. Gas turbines, used in the majority of …
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Development of an autoland system for general aviation aircraft
Accidents due to engine failure, pilot disorientation or pilot incapacitation occur far more frequently in general aviation than in commercial aviation, yet general aviation aircraft are equipped with less safety-enhancing features than commercial aircraft. This thesis presents the design of an …
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Cure Kinetics of Two Part Epoxy Resin and the Effect on Characterization of Thermal Barrier Coatings
… to develop new methods of refining gas turbine engines by increasing power and thermal efficiencies while simultaneously reducing cost. Turbine engines operate under high temperatures and therefore thermal barrier coatings (TBCs) composed of yttria-stabilized zirconia (YSZ) play an important …
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L1 Adaptive Control of Uncertain Nonlinear Systems with Dynamic Constraints: As Applied to Commercial Aircraft Engines
… 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 operation many …
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Particle Sensing in Gas Turbine Inlets Using Optical Measurements and Machine Learning
… and volcanic eruptions, which can induce engine failure in minutes, to condensation and moisture during ground tests that can negatively impact the engine's fuel efficiency. While numerous computational and experimental studies have investigated the effects of particle ingestion on the …
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Aerodynamic Interactions in Vortex Tube Separator Arrays
Helicopter turboshaft engines may ingest large amounts of foreign particles (most commonly sand/dust), which can cause significant compressor blade damage and even engine failure. In many helicopters, this issue is mitigated by separating the particles from the intake airstream. An effective device …
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Creep characterization of single crystal silicon in support of the MIT Micro-Engine Project
… the year 2000. To meet this milestone, the first engine to test will be constructed of single-crystal silicon. Due to its low brittle-to-ductile transition temperature, silicon is not ideal for a production engine. However, the microfabrication technology for silicon is far more advanced than …
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Shape Optimization of Annular Combustors with an Open Source Parallelized Thermoacoustic Helmholtz Solver
… the fatigue of the components and can lead to engine failure. Frameworks that offer quick and accurate results to study thermoacoustic instability are desirable, since the system's stability is extremely sensitive to small changes. In this thesis, we offer a framework that simulates the …
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The effect of turboprop propulsion on the aerodynamic benefits of formation flight
… an initial prescribed wake for the turboprop engines was discretised by shed helicoidal vortex filaments generated by the use of an amalgamation of the propeller theory of Goldstein and Theodorsen. The downwash velocity field of a B747 during cruise, obtained via the use of the VFM …
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Numerical models for rotating Lagrangian particles in turbulent flows
… is to address the problem of aircraft engine degradation due to ingestion of non-aqueous particulates such as sand, dust, and ash. This dissertation introduces high fidelity Lagrangian particle models to account for the rotational effects of particles in complex turbulent flows. Part of …
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