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 29 for “"single engine"”.
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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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Application of Active Noise Control to Reduce Cabin Noise in Single Engine General Aviation Aircraft
… of active noise control to reduce cabin noise in single engine, general aviation aircraft is investigated through the use of the 'filtered x' least mean square algorithm and a simple acoustic feedforward method to generate a reference signal is tested. The system is designed to utilize one …
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Utilizing a Product Rejuvenation Framework to Investigate University Aviation Association Members' Perceptions of the Cessna 172 as a Single Engine Trainer
<p>The purpose of this research was to utilize a product rejuvenation framework to investigate if sufficient market demand exists for Cessna in relaunching the 172 in the collegiate trainer market. The Collegiate Aviation Guide, a publication of the University Aviation Association listing UAA …
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Evaluating Scenarios That Can Startle and Surprise Pilots
… and surprise 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 …
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Utilizing Distributed Vibration Absorbers to Reduce Noise Transmission Through the Windshield of a Cessna 150
… Noise transmitting into the cabin of a single engine aircraft is complex. Researchers have identified areas of noise transmission in general aviation aircraft to include the windshield, exhaust, side windows, and little through the engine firewall. Sources originally noted that …
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Verbal and Nominal Properties in Deverbal and Process Nominals
… general mechanism of word-formation based on the single-engine syntactic approach coupled with a lexical decomposition. I show that the traditional idea that clustering certain properties are necessarily associated with certain first-order categories is not valid. Rather, the idea that certain …
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Using Scenario-Based Training to Teach Single Pilot Resource Management Related to the Use of the BRS Parachute
… Recovery System is an emergency parachute for single engine aircraft which, when released, lowers the aircraft to the ground to prevent terrain collision. This study sought to examine the effects of scenario-based training on pilot’s use of the BRS. Of particular interest was the point at which …
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The stability of an aircraft during the landing roll
… on the stability is then determined. For the single-engine Cessna, the results show that a steady-state yaw angle is obtained after an initial disturbance. The results are presented graphically to show the effect of various parameters on the aircraft's stability.
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A sensitivity/intrusion comparison of mental workload estimation techniques using a simulated flight task emphasizing perceptual piloting behaviors
… danger conditions. A moving-base simulation of a single-engine general aviation aircraft was used. The sensitivity of eight mental workload estimation techniques investigated to changes in perceptual workload was within a univariate factorial design. Concurrently, the differential intrusion of the …
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Design and implementation of evolutionary computation algorithms for volunteer compute networks
… a centralized design pattern, with multiple engines communicating with a central coordinator and case server. The coordinator synchronizes up engines to run experiments and also stores and distributes individual solutions among engines. The engine-coordinator model creates a scalable (engines …
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Dynamic response of machine-foundation systems
… system. An example analysis is made of a single engine driven gas compressor and its foundation. The natural frequencies and amplitudes of motion are calculated. Recommendations are made for the practical application of the analytical procedure based on the present limitations on the …
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MINCE: Dialect-Aware SQL Decomposition for Federated Query Execution
… data environments. While having multiple engines in a data infrastructure enables opportunities for workload optimization, SQL dialect incompatibility makes workload migration difficult. To address this challenge, we develop MINCE (Multi-dialect INtegration and Crossengine Execution), a …
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Autonomous Repair Of Optical Character Recognition Data Through Simple Voting And Multi-dimensional Indexing Techniques
… three major optical character recognition (OCR) engines (ExperVision, Scansoft OCR, and Abby OCR) in use today are all capable of recognizing text at near perfect percentages. The remaining errors however have proven very difficult to identify within a single engine. Recent research has shown …
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Investigation on the Performance Characteristics of Two Valveless Pulse Jets Operating in Phase Opposition
… suggested by an earlier investigation done on a single valveless pulse jet engine at the University of North Dakota by Roger W. Engebretson. It was thought that if two of these engines could be coupled in such a manner that they would fire alternatively, the performance per engine could be …
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Inlet flow-field measurements of a transonic compressor rotor prior to and during steam-induced rotating stall
… catapult is sometimes ingested by the aircraft's engines upon launch which may induce compressor stall. Investigation of the phenomenon known as a "pop stall" is of particular importance as the Navy prepares to field the F35C, the aircraft carrier variant of the joint strike fighter. The single …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… precursors in modern direct injection gasoline engines, with a particular emphasis on statistically efficient calibration of key sub-models. The research addresses the challenges associated with accurately representing combustion processes, liquid fuel films on cylinder surfaces, and surrogate …
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An analysis of current guidance in the certification of airborne software
… from commercial passenger transport down into single-engine piston aircraft. The most comprehensive and recent official guidance on software certification guidelines was approved in 1992 as DO-178B, before the widespread use of object-oriented design and complex aircraft systems integration in …
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Evaluation of primary flight display enhancements for improving general aviation safety
… implemented on a PFD, and flight tested in a single-engine general aviation aircraft. A Takeoff Performance Monitor prototype demonstrated the usefulness of automating the published takeoff distance calculation required of, but seldom performed by, pilots and also showed that performance …
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Examination of Runway Occupancy Times for General Aviation Aircraft
… category II aircraft. For aircraft categories, single engine propeller driven aircraft that weigh less than 12,500 pounds are category I aircraft; twin engine propeller driven aircraft weighing less than 12,500 pounds are category II aircraft (Federal Aviation Administration, 2009). All other …
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A knowledge-based design framework for airplane conceptual and preliminary design
… be obtained. (4) Improved Efficiency: the design engineer can avoid technically correct but irrelevant calculations on incomplete or out of sync information, particularly if the process enables robust geometry earlier. Although numerous advancements in knowledge based design have been developed …
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