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 164 for “"perforated"”.
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Sound radiation from perforated plates
Perforated plates are quite often used as a means of engineering noise control to reduce the sound radiated by structures. However, there appears to be a lack of representative models to determine the sound radiation from a perforated plate. The aim of this thesis is to develop such a model that …
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Potential energy gradient on a perforated plate
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1960
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Aeroacoustic control of landing gear noise using perforated fairings
… to investigate and optimize the application of perforated fairings for landing gear noise control. The sparse knowledge about this new subject has necessitated a more fundamental study involving a basic fairing-strut configuration, followed by wind tunnel tests on a simplified landing gear …
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Assessment of Perforated Unreinforced Masonry Walls Responding In-Plane
… this thesis describes the seismic assessment of perforated unreinforced masonry (URM) walls subjected to in-plane loading through accurate analysis of the wall lateral capacity and seismic demand. Current assessment methods for determining the capacity of perforated URM walls loaded in-plane, as …
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Aeroacoustics of perforated drag plates for quiet transport aircraft
… primarily on aeroacoustic tests and analysis of perforated drag plates. The idea behind a quiet spoiler or drag rudder is to alter the noise production mechanism by perforating the drag plates. The hypothesis is that the large length scales responsible for the noise radiated by unsteady vortical …
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Hydraulic gradient and pressure drop on a perforated plate
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1951.
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Damping Parameter Study of a Perforated Plate with Bias Flow
… the sensitivity of acoustic properties of multi-perforated liners to the changes in the geometry and flow conditions and be used as a tool to design acoustic liners. The conducted research provides an insightful understanding about the contribution of different flow and geometry parameters such …
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Computational Investigation of Perforated Plate Film Cooling Utilizing Conjugate Heat Transfer
… in predicting the cooling effectiveness of a perforated plate film-cooling arrangement is evaluated in ANSYS Fluent. A numerical investigation is performed using the Reynolds Averaged Navier Stokes equations and compared to NASA Glenn’s available Turbulent Heat Flux 4 experimental measurements …
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The structural behavior of cold-formed steel members with perforated elements
… of the instability and post-buckling strength of perforated elements. In this investigation, the buckling loads and post-buckling strength of stiffened and unstiffened compression elements having single circular and square holes have been studied analytically by using the finite element method. …
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Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry
… reactive flow solver to investigate perforated-plate stabilized laminar premixed flames. The developed code is used to examine the impact of the operating conditions and the perforated plate design on the steady flame characteristics. It is also used to numerically investigate the …
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Performance of mild steel perforated plates as a blast wave mitigation technique
… geometric parameters on the performance of perforated plates as a blast wave mitigation technique. Results of experimental and numerical simulations are reported. The main objective of this investigation was to determine the effects of the perforated plate hole size on the blast wave …
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Evaluating the Effectiveness of the Skimmer Versus the Perforated Riser in Sedimentation Basins
… spillway used. The most common spillway is the perforated riser which dewaters the basin throughout its entire vertical profile. However, a relatively new outlet device, the skimmer, has been developed, which dewaters the basin from the water surface. A laboratory study was conducted to compare …
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Structural performance of perforated steel beams with novel web openings and with partial concrete encasement
… on non-composite and partially concrete encased perforated steel Isections with large web openings positioned along the centre-line of the beams was undertaken. This thesis enhances the current knowledge on these classes of perforated beams, as previous research has shown that these beams are …
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Modeling and design of perforated prosthetic sockets ARCHM to increase heat transfer of residual limbs
Heat build-up in prosthetic sockets is a significant problem experienced by many amputees in America, with no central solution in sight. Heat and discomfort accounts for over 70% of problems experienced by lower limb amputees in America. Although there have been advances in prosthetics in the …
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Study on single and double layers micro-perforated panel absorbers and optimal design by genetic algorithm
… REQUEST.] Base on Maa's general theory of micro-perforated panel absorber, the acoustic absorption performance of single and double layers MPP absorbers are investigated. The analytical formula for calculating the absorption coefficient of single and double layers micro-perforated panel are …
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Effect of Overturning Restraint on the Performance of Fully Sheathed and Perforated Timber Framed Shear Walls
This study investigates the monotonic and cyclic response of light-frame wood shear walls with and without openings. Effects of overturning restraint in the form of tie-down anchors and corner segments on light-frame shear walls with and without door and window openings were quantified. While the …
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Developing a mechanistic model for flow through a perforated plate with application to screening of particulate materials
Screening in mineral processing is the practice of separating granulated ore materials into multiple particle size fractions, and is employed in most mineral processing plants. Models of screening performance have been developed previously with the aim of improving process efficiency. Different …
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Structural Behaviour and Seismic Performance Assessment of Steel Plate Shear Walls with Corrugated, Perforated, and Low Yield Point Steel Web Plates
… plate shear walls (SPSWs) employing corrugated, perforated, and low yield point (LYP) steel infill plates are investigated in this research. Such lateral load-bearing systems are used in new and retrofit construction of low- to high-rise buildings. Employment of LYP steel with low yield stress …
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