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 14 of 14 for “"random wave"”.
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A computer controlled random wave generator
Simulation of ocean wave processes and model studies related to marine technology are areas of increasing economic and environmental importance. Sophisticated laboratory facilities are needed to model ocean wave phenomena under controlled conditions. This thesis describes the techniques and …
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A comparison and study of the Born and Rytov expansions
… of the Born and Rytov approximations for use in random wave propagation some forty years ago, a controversy has boiled over the regions of validity and relative merits of the methods. Although the methods fail for strong fluctuations and distant path lengths, these two perturbation methods are …
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Evaluation of Optimized Architected Reef Design in Random Oscillatory Motion for Maximized Wave Energy Dissipation and Coastal Preservation
… architected reef structure aimed at maximizing wave energy dissipation when placed under various real-world environmental conditions. By testing reef structures in sea storm conditions with random oscillatory motion, this study aims to assess the effectiveness of the architected reefs in …
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Topics in diffuse field ultrasonics
Random wave fields that have explored large volumes over long times contain much information. Studying these diffuse fields and extracting the information contained in them are the primary aims of Diffuse Field Theory. When the waves of interest are elastic waves at frequencies above 20kHz, the …
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A SANS study of the interfacial curvatures and the phase behavior in bicontinuous microemulsions
… The method involves the use of a clipped random wave model with an inverse 8th order polynomial spectral function. The spectral density function contains three basic length scales : the inter-domain distance, the coherence length, and the surface roughness parameter. These three length …
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Wave-induced liquefaction processes in marine sediments
… seabed liquefaction induced by progressive water waves is vital for the protection of marine structures from damage to the structure foundations. The residual liquefaction in sedimentary seabed has been found to be of progressive nature and experiments have also demonstrated that the liquefied …
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Some aspects of the analysis of offshore structures
In this thesis, a study is made of the effect of random wave forces on self-supporting steel and concrete oil drilling platforms. Various methods of estimating the forces on the structure, and various ways of idealising both the forces and the structure itself, are compared, the - objective being a …
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Dynamic Analysis Of Offshore Structures
… Analysis. The conventional one dimensional wave equation analysis of the pile driving problem suffers from the empirical representation of the soil parameters. In this study, an improved one dimensional wave equation model is developed which accounts for wave propagation in the soil mass and …
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Fractality and topology of optical singularities
… The interference between three, four and five waves is investigated and inequalities are given which establish the topology of the singularity lines in fields composed of four plane waves. Beyond several waves, numerical simulations are used, supported by experiments, to establish that optical …
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Size-selective sediment transport and cross-shore profile evolution in the nearshore zone
… mixtures were simulated in a small-scale, random-wave flume laboratory using erosive, storm, and accretive wave conditions. Dynamic relationships between the sediment grain sorting and beach profile changes were found to be evident as size-graded sediment fractions tended to relocate to …
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The Formation of Edge Waves Under Monochromatic and Random Incident Waves
Edge waves are coastal waves trapped near the shore by reflection and refraction. Previous studies show the excitation mechanism of edge waves under monochromatic wave conditions via phase locking and nonlinear growth. However, how efficiently the mechanism would work under random incident waves …
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Experimental study of wave-particle interactions in a beam-plasma system
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T20:39:41Z No. of bitstreams: 1 1975_taylor.pdf: 2603581 bytes, checksum: 6f514d312a0be59d2f3d34753c73e36b (MD5)
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Optimality of human acoustic perception of natural sounds, and violin acoustics elucidated with a non-corporeal musical instrument made by fully air-coupled finite-element-modeling of the Titian Stradivarius
… is consistent with diverse natural processes in random wave generation converging to similar intensity scintillation statistics by the central limit theorem. Sensing resolution adapted to follow Weber's Law so provides quantifiable advantages to organisms, systems or machines that rely on …
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A Theory and Analysis of Planing Catamarans in Calm and Rough Water
A planing catamaran is a high-powered, twin-hull water craft that develops the lift which supports its weight, primarily through hydrodynamic water pressure. Presently, there is increasing demand to further develop the catamaran's planing and seakeeping characteristics so that it is more …