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Dissertations / Theses on the topic 'Wave structures'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Wu, Xiong-Jian. "Motion and wave load analyses of large offshore structures and special vessels in waves." Thesis, Brunel University, 1990. http://bura.brunel.ac.uk/handle/2438/7865.

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Predictions of the environmental loading and induced motional and structural responses are among the most important aspects in the overall design process of offshore structures and ships. In this thesis, attention is focused on the wave loads and excited bodily motion responses of large offshore structures and special vessels. With the aim of improving the existing theoretical methods to provide techniques of theoretical effectiveness, computational efficiency, and engineering practicality in marine and offshore applications, the thesis concentrates upon describing fundamental and essential as

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2

Hazell, Jonathan. "New slow wave structures for travelling wave tubes." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59703.

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This thesis covers the design of slow wave structures for travelling wave tubes, with a specific focus on those that could be used for operation at millimetre or shorter wavelengths. Serpentine and a coupled cavity photonic crystal structure are covered in detail, together with the interaction between the electromagnetic waves they support and the electron gun and magnetic beam focusing systems needed for a travelling wave interaction. In Chapter 2, the existing small-signal theory of the travelling wave interaction is introduced and applied to a serpentine travelling wave tube. A set of synth

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3

Md, Noar Nor. "Wave impacts on rectangular structures." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6609.

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There is a good deal of uncertainty and sensitivity in the results for wave impact. In a practical situation, many parameters such as the wave climate will not be known with any accuracy especially the frequency and severity of wave breaking. Even if the wave spectrum is known, this is usually recorded offshore, requiring same sort of (linear) transfer function to estimate the wave climate at the seawall. What is more, the higher spectral moments will generally be unknown. Wave breaking, according to linear wave theory, is known to depend on the wave spectrum, see Srokosz (1986) and Greenhow (

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4

Sander, Tavallaey Shiva. "Wave propagation in sandwich structures /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.

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5

Shareef, Mohamed. "Wave overtopping of coastal structures." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415752.

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6

Swift, R. H. "Wave forces on coastal structures." Thesis, Open University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371247.

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7

Topliss, Margaret E. "Water wave impact on structures." Thesis, University of Bristol, 1994. http://hdl.handle.net/1983/2fa7ba69-7867-4cd0-8b3a-de4de97f98db.

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8

Roe, Eric Allen. "Wave Propagation in Complex Structures." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/380.

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The main focus of this research was to gain an understanding as to how waves propagate through structures. Lamb's Problem was studied on an isometric half plane, where numerical results were obtained. The calculated wavefronts for this problem were in agreement to the numerical results. When a distributed pressure is applied on an isometric half plane, after a long period of time, the wavefronts look as if a point force was applied on the half plane. Waves propagating through an orthotropic material were obtained numerically; it was found that Huygens' Principle cannot be used to calculate the

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9

Casadei, Filippo. "Multiscale analysis of wave propagation in heterogeneous structures." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44889.

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The analysis of wave propagation in solids with complex microstructures, and local heterogeneities finds extensive applications in areas such as material characterization, structural health monitoring (SHM), and metamaterial design. Within continuum mechanics, sources of heterogeneities are typically associated to localized defects in structural components, or to periodic microstructures in phononic crystals and acoustic metamaterials. Numerical analysis often requires computational meshes which are refined enough to resolve the wavelengths of deformation and to properly capture the fine geom

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10

Abdolmaleki, Kourosh. "Modelling of wave impact on offshore structures." University of Western Australia. School of Mechanical Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0055.

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[Truncated abstract] The hydrodynamics of wave impact on offshore structures is not well understood. Wave impacts often involve large deformations of water free-surface. Therefore, a wave impact problem is usually combined with a free-surface problem. The complexity is expanded when the body exposed to a wave impact is allowed to move. The nonlinear interactions between a moving body and fluid is a complicated process that has been a dilemma in the engineering design of offshore and coastal structures for a long time. This thesis used experimental and numerical means to develop further underst

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11

Zuboraj, MD R. "Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1477947681829031.

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12

Narisetti, Raj K. "Wave propagation in nonlinear periodic structures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39643.

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A periodic structure consists of spatially repeating unit cells. From man-made multi-span bridges to naturally occurring atomic lattices, periodic structures are ubiquitous. The periodicity can be exploited to generate frequency bands within which elastic wave propagation is impeded. A limitation to the linear periodic structure is that the filtering properties depend only on the structural design and periodicity which implies that the dispersion characteristics are fixed unless the overall structure or the periodicity is altered. The current research focuses on wave propagation in nonlinear

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13

Xu, Ruo Feng. "Miniaturized guided wave structures and applications." Thesis, University of Kent, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529405.

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14

Klepsvik, Jonny. "Nonlinear wave loads on offshore structures." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36062.

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15

Bucca, Steven E. "Wave propagation in lossy waveguide structures." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44110.

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In this thesis a numerical technique is developed determining the propagation constant in waveguides and transmission lines. The technique accounts for both dielectric and conductor losses in a guide having an arbitrary cross section and uses a full-wave solution process. A set of coupled, vector integral equations which characterize the system are derived. The equations enforce the necessary boundary conditions on the tangential electric and magnetic fields at the boundaries separating the conductors and dielectrics. The method of moments (MOM) technique is used to cast the equations in

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16

Voisey, Ruth. "Multiple wave scattering by quasiperiodic structures." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/multiple-wave-scattering-by-quasiperiodic-structures(1c366ad1-443a-4667-9d03-db77487ab1d1).html.

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Understanding the phenomenon of wave scattering by random media is a ubiquitous problem that has instigated extensive research in the field. This thesis focuses on wave scattering by quasiperiodic media as an alternative approach to provide insight into the effects of structural aperiodicity on the propagation of the waves. Quasiperiodic structures are aperiodic yet ordered so have attributes that make them beneficial to explore. Quasiperiodic lattices are also used to model the atomic structures of quasicrystals; materials that have been found to have a multitude of applications due to their

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17

Ikeda, Tatsunori. "Improvement of surface wave methods for constructing subsurface S-wave velocity structures." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188570.

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18

Beard, Malcolm David. "Guided wave inspection of embedded cylindrical structures." Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/8849.

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19

Khajooeizadeh, Arash. "Metal-insulator-semiconductor (MIS) slow-wave structures." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99773.

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Metal-insulator-semiconductors (MIS) are one of the most basic elements in the digital and microwave circuits. Theoretical and experimental investigation has shown that the dominant mode of propagation in MIS is not a quasi-TEM mode at all frequencies. It has been shown that an MIS transmission line is in fact a slow-wave structure in a certain frequency range. Slow-wave structures offer a large effective permittivity, therefore, can be employed to create large propagation delay and to reduce the guided wavelength. These characteristics can be utilized to design compact passive elements such a

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20

Oakes, Melanie Kathleen. "Violent sea wave impacts on coastal structures." Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410085.

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The damage caused to many coastal structures during storms is suspected to be due to very high pressures from steep and breaking water waves. In this thesis we restrict attention to block work seawalls with vertical faces, with the aim of interpreting the type of violent flows measured and photographed by E.S. Chan and W.K. Melville, in a study reported in Proc. R. Soc. Lond. A, 147: 95-131, 1988. We use two different approaches to model the impact of a sea wave against a coastal structure. The first approach involves applying pressure impulse theory, the integration of pressure over time, to

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21

Sharma, Rahul. "Dynamic wave-modes in solar chromospheric structures." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/21212/.

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Sun’s outer atmosphere is a million degree hotter than it’s visible surface, which is not understood with any of the known laws of thermodynamics and remains an intriguing problem for the astrophysics in general. It is now believed that most of the energy dissipation phenomenon occurs at the interface-region, which is a highly dynamic, gravitationally stratified, nonlinear, inhomogeneous environment, where the plasma-β varies from large, across unity, to very small. Previous studies, suggests that energy from lower solar atmosphere is transported up higher in corona by waves and oscillations t

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22

Li, Tian. "Spin wave propagation in ferromagnetic nano-structures." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263500.

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23

Schöpfer, Philipp. "Non-linear Wave Impact on Monopile Structures." Thesis, KTH, Lättkonstruktioner, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203342.

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This Master Thesis deals with non-linear wave impacts on monopile structures by introducing a potential flow solver named OceanWave3D (OCW3D) for simulating free surface waves and their kinematics under engineering consideration. A comparison to Rambøll’s analytical tool WAVGEN is conducted with the aim of providing distinct recommendations on the application and suitability of both programs for the monopile design. As WAVGEN applies common wave theories it is able to generate single waves in linear or non-linear form but only linear irregular sea states. In contrary, OCW3D includes both the n

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24

Clarke, Thomas. "Guided wave health monitoring of complex structures." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5288.

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Structural Health Monitoring (SHM) systems are widely regarded as capable of significantly reducing inspection costs of safety-critical structures in industries such as aerospace, nuclear, and oil and gas, among others. Successful SHM systems can be considered those which combine good sensitivity to defects, preferably with the capability of localization and identification, with a low sensor density. Techniques based on sparse arrays of sensors which generate and receive guided waves are among the most promising candidates. Guided waves propagate over large distances and certain modes have the

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25

Walker, Daniel Anthony Guy. "Interaction of extreme ocean waves with offshore structures." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:6858dc08-1bd4-4195-8893-1af98d5e68e3.

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With most of the world's untouched oil and gas resources offshore and the possibility that hurricanes are becoming more frequent and more intense, the risks associated with offshore oil and gas production are increasing. Therefore, there is an urgent need to improve current understanding of extreme ocean waves and their interaction with structures. This thesis is concerned with the modelling of extreme ocean waves and their diffraction by offshore structures, with the ultimate aim of proposing improved tools for guiding airgap design. The feasibility of using linear and second order diffractio

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26

Chipengo, Ushemadzoro. "Novel Concepts for Slow Wave Structures used in High Power Backward Wave Oscillators." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1499346841806681.

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27

Lehmann, Lutz. "Wave propagation in infinite domains : with applications to structure interaction /." Berlin [u.a.] : Springer, 2007. http://www.gbv.de/dms/bs/toc/523903820.pdf.

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28

Forslund, Ola. "Scattering and propagation of electromagnetic waves in planar and curved periodic structures - applications to plane wave filters, plane wave absorbers and impedance surfaces." Doctoral thesis, KTH, Alfvén Laboratory, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3825.

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<p>The subject of this thesis is scattering of electromagneticwaves from planar and curved periodic structures. The problemspresented are solved in the frequency domain.</p><p>Scattering from planar structures with two-dimensionalperiodic dependence of constitutive parameters is treated. Theconstitutive parameters are assumed to vary continuously orstepwise in a cross section of a periodically repeating cell.The variation along a longitudinal coordinate z is arbitrary. Ageneral skew lattice is assumed. In the numerical examples, lowloss and high loss dielectric materials are considered. Thepro

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29

Grice, James Robert. "Prediction of extreme wave-structure interactions for multi-columned structures in deep water." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:dd7320c1-7121-4ea7-827f-527af9405e9a.

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With a continuing and rising demand for hydrocarbons, the energy companies are installing infrastructure ever further offshore, where such infrastructure is often exposed to extreme waves. This thesis explores some aspects of wave-structure interaction, particularly the maximum water surface elevation increase in severe storms due to these local interactions. The effects on wave-structure interactions of column cross-sectional shape are investigated using linear and second-order wave diffraction theory. For multi-column structures, the excitation of locally resonant wave modes (near-trapping)

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30

Kitabayashi, Hiroyuki. "Surface acoustic wave filters on diamond layered structures /." *McMaster only, 2001.

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31

Kamath, Arun Mulky. "Calculation of Wave Forces on Structures using REEF3D." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18666.

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Non-breaking wave forces on a cylindrical pile placed on a platform were calculated numerically by solving the 3D Navier Stokes equations in the Numerical Wave Tank of REEF3D. Initially, the numerical wave tank was validated by comparison of the numerical results with the analytical solutions for varying grid density, time step size, numerical beach width, wave amplitude, numerical method- time and spatial discretization, relaxation method and wave type. The performance of the wave tank under the aforementioned various conditions was observed. As a result the appropriate parameters to be used

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32

Yousefzadeh, Behrooz. "Wave transmission in finite dissipative nonlinear periodic structures." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60166.

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Spatially periodic structures exhibit intriguing dynamic characteristics, contributing to their growing applications as phononic crystals, acoustic metamaterials and lightweight lattice materials. A striking feature, employed in many engineering applications, is their filtering effect, whereby waves can propagate only in specific frequency intervals known as pass bands. Other frequency components (stop bands) are spatially attenuated as they propagate through the structure. This thesis studies nonlinear wave transmission in periodic structures of finite extent in the presence of dissipative fo

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33

Vollmann, Johannes. "Wave propagation in viscoelastic and anisotropic, cylindrical structures." Online version, 1996. http://dds.crl.edu/CRLdelivery.asp?tid=11233.

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34

Bennett, Gary Stuart. "Mathematical modelling of wave interaction with vertical structures." Thesis, Brunel University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332808.

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35

Platts, Steven. "Mathematical modelling of wave propagation in disordered structures." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400186.

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36

Carter, Benjamin. "Water-wave propagation through very large floating structures." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/12031.

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Proposed designs for Very Large Floating Structures motivate us to understand water-wave propagation through arrays of hundreds, or possibly thousands, of floating structures. The water-wave problems we study are each formulated under the usual conditions of linear wave theory. We study the frequency-domain problem of water-wave propagation through a periodically arranged array of structures, which are solved using a variety of methods. In the first instance we solve the problem for a periodically arranged infinite array using the method of matched asymptotic expansions for both shallow and de

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37

Wang, Shiyi. "Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1427837723.

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38

Seaman, Roy C. "Beach response in front of wave-reflecting structures." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU105978.

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Several studies have previously demonstrated that sediment transported as bed load under a standing wave will be moved from between node and antinode towards the node where it accumulates. The end result is the generation of areas of scour in the bed between node and antinode and areas of sediment accretion around the node. However, these studies have failed to provide an adequate description of the mechanisms which led to this so-called "N-type" response. Consequently it has been the purpose of this study to examine the phenomenon of N-type beach response in some detail. As a first step an ex

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39

Wallace, Jon. "Modeling Electromagnetic Wave Propagation in Electrically Large Structures." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/91.

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Existing unified numerical electromagnetic methods are often unable to analyze electrically large structures due to the amount of memory and processing power required, necessitating approximate analyses with limited applicability. In this research a hybrid modeling methodology is adopted to solve these complex problems more efficiently than unified numerical methods and more accurately than analytical methods. Electromagnetic modeling problems are divided into two or more levels of scale. Each level analyzes a specific level of detail and only promotes the required information to the next leve

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40

Chau, Fun-pang. "Numerical methods in wave loading of large offshore structures /." [Hong Kong] : University of Hong Kong, 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12315916.

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41

周奮鵬 and Fun-pang Chau. "Numerical methods in wave loading of large offshore structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B31206797.

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42

Kim, Yoonkee. "Surface acoustic wave propagation in multilayered and multichannel waveguide structures." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15060.

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43

Ehrlich, Jeffrey Ellis. "Nonlinear grating structures in indium antimonide waveguides." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184914.

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This dissertation describes various nonlinear grating coupling phenomena in InSb waveguides. InSb exhibits an opto-thermal, diffusive nonlinearity at 9.6μm. This nonlinearity strongly modifies the growth of a guided wave via the grating coupling of an incident, Gaussian signal. In particular, optical limiting and bistability in the coupled power were demonstrated for a detuned grating coupler. The limits on the detunings were also investigated. The experimental results showed qualitative agreement with a theory based upon a diffusive nonlinearity in the grating coupling process. Also demonstra

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44

Hentschel, Martina. "Mesoscopic wave phenomena in electronic and optical ring structures." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2001. http://nbn-resolving.de/urn:nbn:de:swb:14-1008319980781-38394.

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Gegenstand dieser Arbeit sind Wellenphänomene in mesoskopischen Ringstrukturen. In Teil I der Arbeit befassen wir uns mit spinabhängigem Transport von Elektronen in effektiv eindimensionalen Ringen in Gegenwart inhomogener Magnetfelder. Wir benutzen die exakten Lösungen der Schrödinger-Gleichung im allgemeinen nicht-adiabatischen Fall in einem Transfer-Matrix-Formalismus und untersuchen Auswirkungen von geometrischen Phasen auf den Magnetwiderstand. Für den Spezialfall eines Magnetfeldes in der Ringebene sagen wir einen interessanten Spin-Flip-Effekt vorher, der die Steuerung der Polarisations

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45

Ingram, David M. "Numerical prediction of blast wave flows around rigid structures." Thesis, Manchester Metropolitan University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332898.

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46

Hull, P. "Wave impact loading and its effects on blockwork structures." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246333.

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47

Kariapper, Mohamed Sirajudeen. "X-ray standing wave studies of surface adsorption structures." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365232.

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48

Mavridou, Marina. "Tunable microwave and millimetre-wave metamaterial structures and applications." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6263/.

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Novel designs of metamaterial structures as well as novel techniques and configurations for tuning metamaterials are presented in this PhD thesis. The proposed tuning techniques overcome the challenges that exist in other tuning techniques available thus far. Moreover, possible applications of tunable metamaterials in communication systems are proposed. Initially, tunable Electromagnetic Band-Gap (EBG) structures are proposed for low frequencies operation (3GHz to 6GHz) employing a novel biasing technique for varactor diodes. Subsequently, the proposed tunable EBG structures are applied to clo

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49

Park, Sewon. "Sound wave scattering by cyclindrical shells with internal structures." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36061.

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50

Sun, Mengshi. "Numerical investigation of freak wave effects on offshore structures." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27919.

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The freak wave is extremely dangerous to offshore structures due to its unexpected high wave height and strong nonlinearity. Although increasingly more attention is paid to the investigations of freak wave, the principle of its generation mechanism and the factors that contribute to its occurrence remain unclear. Also, few efforts were exerted to investigate the interactions between offshore structures and a freak wave such as wave run-up and slamming force. In this present work, both the two dimensional (2D) and three dimensional (3D) numerical wave tanks are established based on Navier-Stoke

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