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 46 for “"air breathing"”.
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Air-data estimation for air-breathing hypersonic vehicles
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Reaction Control Jet Actuators for Air-Breathing Hypersonic Vehicles
Air-breathing hypersonic vehicles have an engine which is tightly integrated with the airframe. This integration leads to complex dynamic characteristics, such as propulsion-pitch coupling. As a result, air-breathing hypersonic vehicles tend to be unstable and high frequency control is required to …
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Control-oriented Modeling of an Air-breathing Hypersonic Vehicle
Design and development of future high speed aircraft require the use of advanced modeling tools early on in the design phase to study and analyze complex aeroelastic, thermoelastic, and aerothermal interactions. This phase, commonly referred to as the conceptual design phase, involves using first …
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Cruise-dash optimization applied to an air-breathing missile
… of the optimal range-fuel-time trajectory for an air-breathing missile. This method is shown to lead to the reduced-order "cruise-dash" model, and this model is used in the optimization study. Earlier work in this area is extended by the inclusion of two not heretofore considered limits on the …
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Comparative System Analysis of Reusable Rocket and Air-Breathing Launch Vehicles
… the parameters of single- and two-stage reusable air-breathing and rocket launch vehicles to identify configurations which improve space access and merit further developmental emphasis. Investigated air-breathing configurations included both two-dimensional and inward-turning inlet geometries and …
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Design and analysis of a compact high-speed air-breathing engine
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Modeling and Assessment of Efficiency in Arbitrary Air-Breathing Power Systems
… analyze the benefits of emergent technologies. Aircraft propulsion systems are a common subject of such research, and studies of some proposed architectures, such as hybrid-electric powertrains, have suggested potential fuel-burn and nitrogen oxide emissions reductions of up to 10% and 4.9%, …
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Free air breathing planar PEM fuel cell design for portable electronics
… is an order of magnitude lower then reported air breathing fuel cell values, however the route cause has been isolated to the ohmic losses of the planar fuel cell. Increasing the applied contact forces and creating low resistance electronically conductive grid lines, have shown to contribute …
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Air-breathing and movement ecology of Arapaima sp. in the Amazon
… adaptations to changing environments include air-breathing for seasonally hypoxic waters and directed movements to best utilize habitats as they become available. This study examined the environmental, temporal and body-size influences on air-breathing behavior and movement ecology of Arapaima …
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An optimal design methodology for a class of air-breathing launch vehicles
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1980.
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An air-breathing, portable thermoelectric power generator based on a microfabricated silicon combustor
… was 258 Pa for a flow of 15 liters per minute of air, and so the parasitic power requirement for air-pressurization was very low. The demonstration represents an order-of-magnitude improvement in portable-scale electrical power from thermoelectrics and hydrocarbon fuels, and a notable increase in …
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Direct Adaptive Control for Stability and Command Augmentation System of an Air-Breathing Hypersonic Vehicle
… based model of the longitudinal dynamics for an air breathing hypersonic vehicle. The model, derived from first principles, captures the complex interactions between the propulsion system, aerodynamics, and structural dynamics. The linearized aircraft dynamics show unstable and non-minimum phase …
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A breath of fresh air: Breathing stories of the lived experiences of asthma and sporting embodiment
… a range of sports. Asthma is characterised as a breathing disorder and the aim of this research is to add to embodied literature by providing ‘fleshy’ realities of the moving, sweating, sensuous sporting body, which holds meanings, purposes and interests for people who experience sport with …
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The prediction of inlet flow stratification and its influence on the performance of air-breathing hypersonic propulsion systems
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Development of Comprehensive Dynamic Damage Assessment Methodology for High-Bypass Air Breathing Propulsion Subject to Foreign Object Ingestion
… recurring scenario during the operation life of aircraft. Objects can range from as small as a pebble on the tarmac to the size of a large bird. Among the potential ingestion scenarios, damage caused by smaller objects may be considered to be negligible. Alternatively, larger objects can initiate …
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Performance Characteriztion and Modeling of a Passive Direct Methanol Fuel Cell (DMFC) over a Range of Operating Temperatures and Relative Humidities
… power production. In such applications a passive air breathing direct methanol fuel cell would be ideal. However, successful use of the passive DMFC in such applications requires that the fuel cell be capable of operating at various temperatures and relative humidities. A passive air breathing …
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Integration of composite nanomaterials into anode and cathode designs
… designs based on buckeye and toray papers for air-breathing and liquid electrolyte modes. Buckeye and 0.11mm-thick toray papers are used to design the air-breathing cathode by immobilization of Laccase using a non-covalent linking agent. The liquid electrolyte cathode, designed to be applied in …
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Numerical Study on Flow Separation and Performance Characteristics of Slot Nozzle
… out of the nozzle. This slot allows atmospheric air to flow into the nozzle at low altitudes. While this is physically impossible to manufacture, CFD analysis can be conducted to understand how a passive air-breathing engine operates under different conditions. The slot nozzle is a precursor to …
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The role of thyroid and steroid hormones in maturation of the adreline-sensitive reabsorptive mechanism of the fetal lung
… the fetus to transit from an intra-uterine to an air-breathing environment. This study concerns hormonal control of the liquid reabsorptive mechanism in the fetal lung which allows this transition to take place. Thyroidectomy in the fetal sheep at 118 days gestation (term = 147 days) prevented the …
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