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 40 for “"jet propulsion"”.
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Missed opportunities: NACA and jet propulsion
… were the key elements in its failure to develop jet propulsion in the early 1940s. We will focus first on NACA and its organization. The second chapter will describe jet propulsion, particularly the acquisition of a Whittle engine from England and General Arnold 's role in keeping NACA out of the …
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Form, function and flow in the plankton : jet propulsion and filtration by pelagic tunicates
… were used to describe properties of the jet wake and swimming performance variables including thrust, drag and propulsive efficiency. All species investigated swam via vortex ring propulsion. Though Weelia cylindrica was the fastest swimmer, Pegea confoederata was the most efficient, …
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Form, function and flow in the plankton : jet propulsion and filtration by pelagic tunicates
… were used to describe properties of the jet wake and swimming performance variables including thrust, drag and propulsive efficiency. All species investigated swam via vortex ring propulsion. Though Weelia cylindrica was the fastest swimmer, Pegea confoederata was the most efficient, …
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Design and Development of a Novel Soft Valve and Energy-Storage Mechanism for High-Power Underwater Robotic Pulse-Jet Propulsion
… an energy-storage membrane to enable high-power jet propulsion for locomotion. The presented system aims to impose minimal impact or risk to these settings by developing this propulsion system\textbf{,} which offers a novel alternative to spinning propellors most often used in underwater …
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Parallel pulsed jets for precise underwater propulsion
… swimmers, applying the principles of pulsed jet propulsion to robotic thrusters. Although most developments have focused on single jet actuators, nature provides some indications that multi-jet systems can provide propulsive benefits -- marine invertebrates called sales connect into chains of …
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Design and Analysis of a Thermal Shield System for the Starprobe Spacecraft.
STARPROBE is a mission option study by the Jet Propulsion Laboratory (JPL) of the California Institute of Technology and Ames Research Center (ARC) of the National Aeronautics and Space Administration (NASA) of an unmanned spacecraft for close-range solar observation.
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Locomotion and Control of Cnidarian-Inspired Robots
… predators and pursuit of prey. This controlled propulsion in terms of varying speed, turning rates, and actuation effort is of interest for the next generation of underwater vehicle design. Integration of biological functional simplicity, robustness, and superior performance enables robotic …
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Design of a laboratory test bed for planetary rover systems
… presented. The rover's geometry is scaled from Jet Propulsion Laboratory's Lightweight Survivable Rover (LSR). The 3 degree of freedom manipulator arm and two end-effector designs are also detailed. These mechanisms are serving as the experimental system for studying control, vision, and …
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High Resolution Wind Retrieval for SeaWinds on QuikSCAT
… estimated from the same scatterometer by the Jet Propulsion Laboratory. The high resolution winds allow features such as the eye of hurricanes to be seen with much greater detail than was previously possible.</p>
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A Process Architecture and Runtime Environment for Dependable Distributed Applications
… spaceborne, scientific applications for the Jet Propulsion Laboratory (JPL). Error injection experiments validate the SIFT environment's ability to recover not only from user application errors, but also ARMOR errors as well. Finally, five other case studies illustrate how the ARMOR-based …
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Composition sensors calibration and characterization and warmup analysis for the Mars Oxygen In-Situ Resource Utilization Experiment (MOXIE)
… rover. MOXIE was developed by MIT and NASA's Jet Propulsion Laboratory (JPL) to demonstrate, for the first time, In-Situ Resource Utilization (ISRU) on another planet by extracting O₂ from CO₂ in the Martian atmosphere using solid oxide electrolysis (SOE). In order to inform and control its …
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Determining organic vapor cartridge breakthrough characteristics of JP-8 during aircraft fuel tank entry operations
… life of organic vapor cartridges exposed to jet Propulsion Type 8 fuel vapor. Two experiments were conducted that involved exposing 45 cartridges to three challenge concentrations (300, 600, and 1200 parts per million) of fuel vapor and two relative humidity levels (50 and 80 percent). The …
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Modeling, Design, and Assembly of Spring Tires
… autonomous lunar traversal rover built at NASA Jet Propulsion Laboratory, and IPEx, a lunar regolith mining robot built at Kennedy Space Center. This thesis discusses the modeling of these spring tires with numerical methods along with the design of two spring tire prototypes for use on the …
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Computer Vision Techniques for Drill Bit Identification and Mechanical Wear Detection
… on board the Mars 2020 Perseverance Rover, a Jet Propulsion Laboratory (JPL) mission. The effectiveness of thresholding and segmentation on two critical tasks, drill bit identification and mechanical wear detection, is demonstrated. Then, transfer learning of convolutional neural networks …
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Simulation and study of harmonic interference in power line communications
… using a distribution network provided by the Jet Propulsion Laboratory discussions, and conclusions are presented.
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A spaceborne synthetic aperture radar data processor
… Imaging Radar B (SIRB) and was supplied by the Jet Propulsion Laboratories (JPL) in California. The basic functions performed by the software include range and azimuth processing, which involve the match filtering of reference functions with the raw data. Compensation for the effects of being a …
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Ground Station Mixed-Signal PCB and SFP Ethernet-to-Optical Connector for the Deployable Optical Receiver Aperture (DORA) CubeSat
… Optical Receiver Aperture (DORA) project at the Jet Propulsion Laboratory (JPL) in collaboration with Arizona State University (ASU) aims to demonstrate 1 Gbps data rate for crosslink communications among small spacecraft. There are numerous applications for this technology, including satellite …
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Validation of Conjugate Heat-Transfer Capability for Water- Cooled High-Speed Flows
… the increase in water coolant temperature, ii) Jet Propulsion Lab converging-diverging nozzle test for which nozzle and run-up were well-instrumented with thermocouples, iii) NASA Glenn Research Center experiment on a series of water cooled panels subject to heating from an impinging rocket …
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Laboratory Characterization of Mars In-Situ Resource Utilization (ISRU) using the Mars Oxygen ISRU Experiment (MOXIE) FlatSat Testbed
… (MIT), MIT Haystack Observatory, and NASA Jet Propulsion Laboratory (JPL) developed the MOXIE FlatSat as a ground-based operational testbed to further characterize the MOXIE system, evaluate and validate planned MOXIE operations on Mars, and demonstrate potential operating modes and …
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Dynamics of multi-body space interferometers including reaction wheel gyroscopic stiffening effects : structurally connected and electromagnetic formation of flying architectures
… Micro-Precision Interferometer testbed at NASA's Jet Propulsion Laboratory. The predictions show great improvement over a simplified "decoupled" analysis method when compared to experimental data. For formation flying interferometers, we consider the use of electromagnets as relative position …
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