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 86 for “"dynamic pressure"”.
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Dynamic pressure sensors for hypersonic flow measurements
… on the research and development of an acoustic pressure sensor tailored for hypersonic boundary layer flow measurements. Hypersonic boundary layer flows comprise shocks, laminar-to-turbulent transitions, and high-frequency turbulence with small (sub 1-mm) characteristic length scales. …
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Analysis of a dynamic pressure measuring system
A dynamic pressure measuring system composed of long connecting tube, transducer, D-C amplifier and galvanometer oscillograph were used in a wind study conducted by the Department of Agricultural Engineering, Virginia Polytechnic Institute. The instrumentation was used to measure and record dynamic …
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Dynamic Pressure Sensing for the Flight Test Data System
… data acquisition capability for up to two pressure sensors and an additional three low-frequency pressure sensors. Development of the FTDS-K was separated into a core module, specialized analog subsystem, and practical testing of the FTDS-K in a flow measurement mission. The core module …
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Design and Validation of a Dynamic Pressure-Based Loading Device and 3D Strain Tracking Protocol for Ventral Hernia Modeling
… repair site. During a cough, the intra-abdominal pressure (IAP) can rise as high as 2.5 psi, compared to the normal IAP of approximately 0.1-0.2 psi. The goal of this project was to design a testing device that can apply and measure a representative coughing force applied to an ex vivo porcine …
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Development and testing of experimental equipment to measure pore pressure and dynamic pressure at points outside a pipe leak
… tubes. When using the experimental setup, pore pressures and dynamic pressures around the leak and therefore within the ballotini bed were measured using two Pitot tubes. The accuracy and repeatability of these measurements were also of importance and were investigated. The accuracy of the …
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The effect of blast loading on a guy cable
… blast wave characteristics, that is, overpressure and dynamic pressure. But the most damaging effect to the guy cable from a nuclear explosion would be the dynamic pressure caused by the high winds which follow the chock front. This dynamic pressure reaches its maximum value very rapidly, …
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The penetration and mixing of a sonic hydrogen jet injected normal to Mach 4 airstream
… to determine the effects of jet-to-free-stream dynamic pressure ratio on the penetration and mixing of a sonic hydrogen jet injected normal to a Mach 4 airstream. The hydrogen gas was injected from a circular nozzle flush mounted in a flat plate with a turbulent boundary-layer thickness of 2.70 …
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Supersonic flutter of sandwich panels: effects of face sheet bending stiffness, rotary inertia, and orthotropic core shear stiffnesses
… On the basis of two-dimensional static aerodynamic theory an exact solution is obtained for panels having simply supported edges parallel to the airflow. The leading and trailing edges may be simply supported or clamped. The mathematical model describing the panel motion includes terms that …
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Optimal control problems with switching points
… rocket (Goddard Problem) in presence of a dynamic pressure limit, and range maximization for a supersonic aircraft flying in the vertical plane, also in presence of a dynamic pressure limit. In the second problem singular control appears along arcs with active dynamic pressure limit, which, …
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Flutter of sandwich panels at supersonic speeds
… to the deformed middle surface. The aerodynamic loading on the panel is given by two-dimensional static aerodynamics. The adequacy of such an approximation has been demonstrated for panels rigid in shear and the mathematical simplicity allows closed-form solutions to be found. The …
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Terminal transient for minimum-time dash mission
… this terminal transient maneuver experience dynamic pressures that will exceed the dynamic pressure limit unless a constraint is placed on the state variables. Because of the need for enforcing this state constraint, a direct adjoining method for handling state constraints in the optimal …
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Experimental investigation of helium injection at a low downstream angle into supersonic flow
… to determine their mixing, penetration and total pressure loss when injected into a supersonic air cross flow. From this information, the performance of these jets as fuel injectors in a supersonic combustion ramjet (scramjet) combustion chamber was estimated. Both injection angle jets were made …
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Effects of Elevated Intracranial Pressure on a Cerebral Vein Model
… of occluded cerebral venous flow on intracranial pressure (ICP) have not been considered in a model for HBI as opposed to the context of stroke and neonatal hypoxic-ischemic encephalopathy. In this project, the effects of elevated ICP on the hemodynamics and structural dynamics of a diploic vein …
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MITIGATION OF GEAR MESH-FREQUENCY VIBRATIONS UTILIZING A HYDROSTATIC BEARING
… for the frequency response of the transmitted dynamic pressure was developed. In addition, a proof of concept experiment was designed and implemented to validate the theoretical models. The experimental data shows similar attenuation of the transmitted dynamic pressure according to theoretical …
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Acoustic boundary condition estimation in a near-scale gas-turbine combustor
… are used with a combination of two resources: dynamic pressure measurements obtained during combustor operation, and a finite element method-based model of the combustion chamber. Results of a theoretical analysis are presented which show that the method is capable of accomplishing its mission. …
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Ram pressure correlations for aspirated cylinders
… is driven by two major sources, the freestream dynamic pressure resulting from the forward motion of the vehicle and the internal vacuum created by the underhood fan. The flow fields associated with both sources must be considered when assessing the cooling performance of a new automobile …
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A study of static and dynamic robustness of hydro/omniphobic surfaces
… that are not flat but distorted due to pressure differences across the interfaces between the asperities. These distorted interfaces play an essential role in the transition from the composite Cassie-Baxter state to the fully-wetted Wenzel state and in the determination of the robustness …
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Stress and reliability analysis of multilayered composite cylinder under thermal and mechanical loads
… axisymmetric temperature loading combined with dynamic pressure as well as asymmetric temperature loading are also obtained. The method of Fourier series together with Laplace transform is utilized in solving the heat conduction equation and thermal stress analysis. The inertial term is …
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Flow Interaction Between Turbomachine Blade Row and Flow Resistance Medium
<p>This research investigates the fluid-dynamic interaction between close-coupled axial turbomachines and surrounding components, e.g., heat-exchangers, filters, or cooling fins in high-density computer servers, and its effects on turbomachine and system performance. The importance of this research …
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