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 “"Ground Test"”.
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Design, instrumentation, and control of a heliogyro solar sail ground test demonstrator
… and Control of a Heliogyro Solar Sail Ground Test Demonstrator Thesis directed by Dr. Keith Williams The goal of this research is to establish a means for terrestrial testing and model verification for heliogyro solar sail technology. A simplified testbed was in place but utilized …
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A torsion pendulum ground test of the LISA Pathfinder Free-fall mode
… be actively compensated in order to hold the test particles centred inside an orbiting apparatus. The actuation force applied to compensate this effect introduces a dominant source of force noise in the mission noise budget. To suppress this noise source and avoid actuation instabilities, a …
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Methodology Development and Investigation of Turbofan Engine Response to Simultaneous Inlet Total Pressure and Swirl Distortion
As a contribution to advancing turbofan engine ground test technology in support of propulsion system integration in modern conceptual aircraft, a novel inlet distortion generator (ScreenVaneTM) was invented. The device simultaneously reproduces combined inlet total pressure and swirl distortion …
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Acoustic Emission Signal Classification for Gearbox Failure Detection
… in acoustic emission (AE) data obtained from a ground test stand of a rotating H-60 helicopter tail gearbox by using mathematical algorithms and visual inspection. Signs of fatigue crack growth were observed from the AE signals acquired from the result of the optimal number of clusters in a data …
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A technical evaluation of a novel cell-surface cytokine detection technology
… collect, much experimental data from vacuum tank tests is readily available. Effectively taking advantage of this wealth requires understanding of the effects from imperfect ground test conditions. A previous plume model, Qasi3, has been upgraded to better simulate the vacuum tank environment …
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Computational modeling of a Hall thruster plasma plume in a vacuum tank
… collect, much experimental data from vacuum tank tests is readily available. Effectively taking advantage of this wealth requires understanding of the effects from imperfect ground test conditions. A previous plume model, Qasi3, has been upgraded to better simulate the vacuum tank environment …
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Autonomous landing system for a UAV
… is to establish communication between the UAV's ground station and the Autonomous Landing Flight Control Computer effectively. The second addresses the design and implementation of an autonomous landing controller using classical control techniques. Device drivers for the sensors and the …
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Assessment of an Innovative Experimental Facility for Testing Diffusing Serpentine Inlets with Large Amounts of Boundary Layer Ingestion
… experimental facility was developed for testing flush-mounted, diffusing serpentine inlets intended for use on blended-wing-body aircraft. The static ground test facility was able to simulate the boundary layer profile expected to be ingested by inlets mounted on the aft sections of these …
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Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester
… energy, is designed, fabricated, simulated, and tested in this research. The proposed design is analyzed with a theoretical modelling which has then been validated with a ground test. Result reveals that the prototype has been able to produce up to 600 watts of peak power and around 150 watts of …
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Heat Flux Reconstruction in a Multimaterial Gauge with Multiple Embedded Temperature Sensors
… maps is one of the major data reduction tasks of ground-test hypersonic facilities. The ability to embed multiple high-frequency sensing elements offers improved performance of over other types of heat flux gauges, such as Schmidt-Bolter gauges, when there is significant lateral heat flux, i.e., …
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Laser absorption spectroscopy for investigation of hypersonic propulsion
… interest in hypersonic propulsion. Progress in ground-testing capabilities has accelerated this technological advancement, providing repeatable and controllable experimentation at lower costs than flight tests. A primary challenge of carrying out experiments in these ground test facilities is …
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A combined cycle approach to dual-mode scramjet design and analysis
… in reproducing relevant flows in current ground test facilities. Flight testing is a crucial phase in the comprehensive study of hypersonic and scramjet-related flows. To glean fundamental insight into these flows from these high-cost experiments it is important to ground the design of a …
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Conflict and communication : critical theory, international relations and the intervention in Kosovo
… developments in discourse ethics to formulate, ground, test and evaluate a critical theoretical framework. This framework is presented as a series of `communicative imperatives' which might inform initiatives in conflict resolution. The `communicative imperatives' are derived from an analysis of …
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Experimental Investigation of Fan Rotor Response to Inlet Swirl Distortion
… the component for analysis. Constant speed tests were conducted under clean and distorted test conditions. For clean tests, a straight cylindrical inlet duct was attached to the fan case; for distorted tests, a StreamVane swirl distortion generator was inserted into the inlet duct. The …
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Development of an incremental and iterative risk reduction facility for robotic servicing and assembly missions
… mission through the development of a series of testbeds that build successively upon one another is investigated. Robotic Servicing and Assembly (RSA) missions are believed to enable life extension programs for existing spacecraft while also enabling much larger and more complex satellites to be …
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Heat Transfer, Transition, And Aerodynamic Loss In A Linear Vane Cascade At Low Reynolds Numbers In High Speed Flows
… times. Due to the limited abilities of current ground test facilities, new methodologies and facilities are needed to produce detailed heat transfer and flow loss data pertinent to the low pressure turbine operating conditions. </p> <p>The Mechanical Engineering Department at the University of …
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Effectiveness of a Serpentine Inlet Duct Flow Control Scheme at Design and Off-Design Simulated Flight Conditions
… investigation was conducted in a static ground test facility to determine the flow quality of a serpentine inlet duct incorporating active flow control for several simulated flight conditions. The total pressure distortion at the aerodynamic interface plane (AIP) was then used to predict …
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Post-shock thermochemistry in hypervelocity CO2 and air flow
… first-order matching parameter for comparative testing. In an e ffort to address surface chemistry issues arising from high-enthalpy carbon dioxide ground-test based experiments, spherical stagnation point and aeroshell heat transfer distributions are also compared with simulation. Very good …
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The Design and Analysis of Bluff Body Dynamic Distortion Generators
… a way to generate these unsteady flows in ground test facilities needs to be developed. StreamVanes and ScreenVanes were developed at Virginia Tech as a way to generate real-world swirl and pressure distortion profiles for engine testing. However, they are only capable of generating steady …
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AEROSOL EFFECTS IN HIGH SUPERSONIC FLOWS
… and commercial use. For initial investigations, ground test facilities are preferred to flight tests as they are far cheaper and carry significantly less risk, although wind tunnels can only replicate a subset of the conditions experienced in actual flight. One of these conditions that has not …
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