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 31 for “"Stand-Off Distance"”.
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The effect of stand-off distance on the failure of thin plates subjected to blast loads
… This investigation examines the effect of stand-off distance on the response of fully clamped circular plates subjected to blast loads. The experimental procedure consists of creating a blast load using disc shaped plastic explosive mounted onto a tube of required length. The length of the …
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Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry
… the equivalence ratio, mean inlet velocity, the distance between the perforated plate holes and the plate thermal conductivity. In the case of an adiabatic plate, a conical flame is formed, anchored near the corner of the hole. When the heat exchange between the mixture and the plate is finite, …
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Investigation of stagnation-flow diamond-forming flames using advanced laser diagnostics
… National Laboratories, except that the measured distance between the substrate and the reaction zone is much less than predicted. The measurements show that the flame stand-off distance is approximately 0.6 to 0.8 mm along the stagnation streamline, while the model predicts a flame stand-off …
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Avionics systems design for cooperative unmanned air and ground vehicles
… up-close surveillance capability from a large stand-off distance. Different types of cooperative action between air and ground vehicles, that can help to enhance the overall system surveillance capability, are analyzed, including communication relay, simultaneous visual surveillance of ground …
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The effects of different degrees of confinement on the deformation of square plates subjected to blast loading
… is dependent on several factors; for instance stand off distance, geometry and mass of explosive, geometry of the structure, medium (air, water, soil) and degree of confinement. Depending on the location of the explosion relative to the surrounding structures different degrees of confinement …
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Descaling petroleum production tubing using multiple high-pressure nozzles
… flat fan nozzles of different arrangement and stand-off distance. Housed in a constructed simulated production tubing chamber with vacuum and compression capacities to remove hard scale deposits of SrSO4 and CaCO3. In addition to the constructed wax deposit (paraffin) of different shapes …
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Increasing the Heat Transfer on a Grooved Surface Under Dry and Wet Conditions by Using of Jet Impingement
… array orifices diameter and array to surface stand-off distance. The results have shown that jet impingement is capable of delivering high transfer rates with lower cooling cost rates compared to current industry conventional techniques. Water is efficiently used in hybrid jet impingement …
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Response of plates subjected to air-blast and buried explosions
… blast load is influenced by many factors, namely stand off distance, mass of explosive, degrees of confinement and medium surrounding the charge. This study focuses on characterizing the transient deformation of test plates which have been exposed to different explosive loading conditions …
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Investigation of formation and applications of high-speed liquid projectiles
… is monotonously decreasing with increase of stand-off distance, the effect of stand-off distance onto penetration of brittle material has an extremal character. A series of experiments were carried out in order to investigate the demolition of brittle, deformation of ductile and …
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The response of honeycomb sandwich panels to blast loads
… providing better blast protection and to understand the various effects influencing the structural performance. This thesis reports on an investigation into the behaviour of circular sandwich panels with aluminium honeycomb cores subjected to air blast loading. It focuses on the effect of …
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The effect of bend radius on the impulse transfer characteristics of V-hulls
… with PE4 charges ranging from 19 g to 58 g at a stand-off distance (SOD) of 34mm were performed. The geometric scaling was based on the dimensions of the TM-57 landmine and the Casspir APC MK II. In the numerical model, the optimum element length for the air mesh was obtained by performing a mesh …
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Improving the Performance of Re-entry Vehicle in Hypersonic Flow by Morphing Nose cone by Bio-Mimicking Honey Bee Abdomen
… compared to the contracted position. The shock stand-off distance significantly influences the flow field. The shock-detachment distance is significantly greater during contraction and default phases, while it is reduced during extension phases. The velocity/Mach number decreases sharply in the …
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Development of a Acrylonitrile Butadiene Styrene toner for an electrophotography based additive manufacturing process
… properties for different heating, pressure and stand-off distance conditions. It was found that, due to insufficient heating and applied pressure the final samples suffered from high porosity and poor tensile strength.
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AN EXPERIMENTAL AND NUMERICAL STUDY ON CAVITATION BUBBLE DYNAMICS AND ITS BIOMEDICAL APPLICATIONS
A thorough understanding of cavitation bubble dynamics is critical to mitigate cavitation damage or develop practical applications. An important field of study is the interaction of a single cavitation bubble with neighbouring structure(s). A cavitation bubble collapse near a finite elastic beam, …
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Long-range depth profiling based on time-correlated single-photon counting
… target objects. Modern single-photon detectors offer high quantum efficiencies and small timing jitters in the order of tens of ps, allowing for the rapid acquisition of high-resolution time-of-flight information with eye-safe illumination powers. In time-correlated single-photon counting …
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Reconstruction Resolution Of Coherent Point Sources With Helmholtz Equation Least Squares
… spatial resolution decreases with increasing stand-off distance and decreasing Signal to Noise Ratio (SNR). Also, in methods other than HELS, measurement spacing must exceed the spacing derived from the Nyquist rate to mitigate the risk of aliasing. HELS is not limited by the Nyquist rate due …
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Response of composite and steel V-structures to localised air blast loading-numerical and experimental
… PE4 charges ranging from 10 g to 40 g at a Stand-Off Distance (SOD) of 34 mm. Digital Image Correlation (DIC) was used to track the transient deformation of the V-structures, while the final deformed profile of the V-structures was determined using a 3D scanner. A series of numerical …
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Resonant sensors for passive, real-time, and wireless characterization of biological analytes
… The resonant frequency can be measured up to 5cm stand-off distance by a 3D-printed coplanar, two-loop coil reader antenna. This reader is attached to a vector network analyzer for monitoring the magnitude of S21 scattering parameter. The central hypothesis is that the Archimedean spiral sensors …
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Optimisation of process parameters of high power CO2 Laser cutting for advanced materials
… focal point position, nozzle diameter and stand-off distance. The quality features investigated are: upper kerf width, lower kerf width, ratio between two kerfs, heat affected zone (HAZ), roughness of the cut section and operating cost. Materials, commonly used in industry, in sheet form …
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Modification of Blade-Vortex Interactions Using Leading Edge Blowing
… and in other cases the jet increase the mean stand-off distance of the vortex as it convects over the airfoil surface. It was also found that, for large circular cylinders, if the airfoil is within the mean closure point of the circular cylinder wake, the LEB can increase the level of BVI. The …
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