Thematische Bibliographien / Wave condition

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Auswahl der wissenschaftlichen Literatur zum Thema „Wave condition“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Wave condition"

Mori, Nobuhito, Hajime Mase und Tomohiro Yasuda. „FREAK WAVE AND WEATHER CONDITION“. Coastal Engineering Proceedings 1, Nr. 32 (01.02.2011): 70. http://dx.doi.org/10.9753/icce.v32.waves.70.

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The kurtosis of the surface elevation, Benjamin-Feir Index (BFI) and directional spread are measures of nonlinear four-wave interactions and freak waves. The dependence of kurtosis, BFI and directional spread under typhoon conditions are examined by numerical simulations. The BFI is significantly large in the fourth quadrant of the typhoon while the directional spread is small in the fourth quadrant. It was found that the potentially possible area of freak wave occurrence is the fourth quadrant of the typhoon rather than the other quadrants.

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Yu, Wen, Fenggang Wang, Jianguo Lin und Dong Li. „Numerical Simulation of the Force Acting on the Riser by Two Internal Solitary Waves“. Applied Sciences 12, Nr. 10 (11.05.2022): 4873. http://dx.doi.org/10.3390/app12104873.

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An internal wave is a typical dynamic process. As an internal wave, an internal solitary wave usually occurs between two layers of fluids with different densities. Compared with general internal waves, internal solitary waves have large amplitudes, fast propagation speeds, short-wave periods, and often have tremendous energy. The propagation causes strong convergence and divergence of seawater and generates a sudden strong current. Due to its various characteristics, the propagation of internal solitary waves can cause serious harm to offshore engineering structures. Therefore, studying the effects of internal solitary waves on risers is vital in preventing environmental pollution caused by riser damage. Although the research on internal solitary waves has achieved very fruitful results, the research on structures is mostly focused on a single condition, and the occurrence of internal solitary wave, as a complex ocean phenomenon, is often accompanied by many situations. Therefore, this paper constructs a numerical simulation of the interaction between two columns of internal solitary waves and risers. This study explores the force and flow field changes of the riser under the condition of multiple internal solitary waves using the Star-CCM+ software in the simulation. The improved K-epsilon turbulence model was adopted to close the three-dimensional incompressible Navier–Stokes equation, and the solitary wave solution of the eKdV equation was used as the initial and boundary conditions. The interaction between single and double internal solitary waves and a riser was calculated, compared, and analyzed using numerical analysis. The experiment results indicate that the conditions of two internal solitary waves differ from those of a single internal solitary wave. After colliding at the riser, the waves gradually merge into a single wave, and the flow field reaches its minimum velocity. Under the two-wave condition, the horizontal force on the riser as a whole is less than the single-wave condition. As the amplitude difference between the two internal solitary waves gradually decreases, the horizontal opposing force received by the riser first increases and then decreases, while the horizontal positive force gradually decreases.

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Tang, Haoyun, Huilong Ren, Hui Li und Qi Zhong. „Experimental Investigation of Wave-Induced Hydroelastic Vibrations of Trimaran in Oblique Irregular Waves“. Shock and Vibration 2016 (2016): 1–17. http://dx.doi.org/10.1155/2016/8794560.

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The irregular wave condition, especially the oblique irregular wave condition, is the actual circumstances when trimaran is sailing in sea. In order to identify the characteristic of the wave-induced hydroelastic vibration in irregular waves, as well as investigate the change of vibration in different oblique irregular wave conditions, trimaran model tests were conducted to measure vibrations, wave impact, and motion under different azimuth and wave height. The vibration on main hull, side hull, and cross-desk is measured and analyzed separately to observe the influence of irregular wave in different structural parts. The longitudinal vibration, transverse vibration, and torsion are also included in the model tests measurement to investigate the relationship between these vibration deformation components and parameters of the irregular waves. The wave-induced hydroelastic vibrations and whipping effect is extracted and analyzed to find influence of whipping and springing on the total vibration. Based on the analysis, the dangerous positions and the critical waves condition is introduced to ensure that the subsequent structural strength assessment is more reliable.

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Stresswave Technology Ltd. „Stress wave condition monitoring“. NDT & E International 23, Nr. 4 (August 1990): 240. http://dx.doi.org/10.1016/0963-8695(90)90978-r.

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Stresswave Technology Ltd. „Stress wave condition monitoring“. NDT International 23, Nr. 4 (August 1990): 240. http://dx.doi.org/10.1016/0308-9126(90)91714-5.

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Ismail, Mohd Arif, Nik Mohd Ridzuan Shaharuddin, Omar Yaakob, Mohamad Hidayat Jamal, Faizul Amri Adnan, Ahmad Hadi Mohamed Rashidi, Wan Ahmad Hafiz Wan Mohd Azhary et al. „WAKE WASH OF A FAST SMALL BOAT IN RESTRICTED WATERS: MODEL TESTS AND FULL-SCALE MEASUREMENTS“. Brodogradnja 73, Nr. 2 (01.03.2022): 93–119. http://dx.doi.org/10.21278/brod73206.

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This paper presents the model testing of an 8.23m boat with hard chine planning hull generated waves at the Kilim recreational park. Wake is considered one of the main causes of riverbank erosion due to the energy carried by waves hitting the riverbank. Initially, ship particulars were measured from actual boats to generate a hull form using MAXSURF software. A lines plan was then generated to fabricate the model using fibreglass. Experiments were conducted in the National Hydraulic Research Institute of Malaysia (NAHRIM) at various speeds at a constant operating draft. The wave patterns generated by the modelled boats at different speeds were recorded for analysis. Wave attenuation for deep water conditions was studied and it was found that the wave exponent, n ranged from -0.36 to -0.75 for all depth Froude number (Fnh) condition. Wave decay analysis was used to estimate wave height for defined water depth. For 11 people with an average mass of 65 kg on board, the produced wave height was greater than the permissible wave wake height of 75 mm. The generated energy exceeded 60 Joules/m for nearly all measured speeds. A boat speed of less than 5 knots was suggested for boats loaded with the maximum passenger limit of 11 people. Other recommendations were made to minimize the wave wake height produced by the modelled boat.

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Lamacz, A., und B. Schweizer. „Outgoing wave conditions in photonic crystals and transmission properties at interfaces“. ESAIM: Mathematical Modelling and Numerical Analysis 52, Nr. 5 (September 2018): 1913–45. http://dx.doi.org/10.1051/m2an/2018026.

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We analyze the propagation of waves in unbounded photonic crystals. Waves are described by a Helmholtz equation with x-dependent coefficients, the scattering problem must be completed with a radiation condition at infinity. We develop an outgoing wave condition with the help of a Bloch wave expansion. Our radiation condition admits a uniqueness result, formulated in terms of the Bloch measure of solutions. We use the new radiation condition to analyze the transmission problem where, at fixed frequency, a wave hits the interface between free space and a photonic crystal. We show that the vertical wave number of the incident wave is a conserved quantity. Together with the frequency condition for the transmitted wave, this condition leads (for appropriate photonic crystals) to the effect of negative refraction at the interface.

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Randall, C. J. „Absorbing boundary condition for the elastic wave equation“. GEOPHYSICS 53, Nr. 5 (Mai 1988): 611–24. http://dx.doi.org/10.1190/1.1442496.

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Extant absorbing boundary conditions for the elastic wave equation are generally effective only for waves nearly normally incident upon the boundary. High reflectivity is exhibited for waves traveling obliquely to the boundary. In this paper, a new and efficient absorbing boundary condition for two‐dimensional and three‐dimensional finite‐difference calculations of elastic wave propagation is presented. Compressional and shear components of the incident vector displacement fields are separated by calculating intermediary scalar potentials, allowing the use of Lindman’s boundary condition for scalar fields, which is highly absorbing for waves incident at any angle. The elastic medium is assumed to be homogeneous in the region immediately adjacent to the boundary. The reflectivity matrix of the resulting absorbing boundary for elastic waves is calculated, including the effects of finite‐difference truncation error. For effectively all angles of incidence, reflectivities are much smaller than those of the commonly employed paraxial absorbing boundaries, and the boundary condition is stable for any physical Poisson’s ratio. The nearly complete absorption predicted by the reflectivity matrix calculations, even at near grazing incidence, is demonstrated in a finite‐difference application.

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Taniguchi, Kenji. „Variations in Winter Ocean Wave Climate in the Japan Sea under the Global Warming Condition“. Journal of Marine Science and Engineering 7, Nr. 5 (15.05.2019): 150. http://dx.doi.org/10.3390/jmse7050150.

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Future variations in the ocean wave climate caused by global warming could affect various coastal issues. Using a third-generation wave model, this study produced projections of the ocean wave climate for winter around Japan, focusing on the Japan Sea side. Wave simulation forcing (sea surface wind) was generated through five different global warming experiments. More than half the future wave projections showed an increasing tendency of the climatological mean significant wave height during winter. However, the maximum significant wave height did not show any clear tendency in future variation. The top 1% of significant wave heights and mean wave periods showed apparent increases in frequencies of higher/longer waves in three out of the five future projections. Frequency distributions of significant wave height, mean wave period, mean wavelength and wave direction showed various future variations (reduction of small ocean waves, increasing frequency of waves from the west). There are large uncertainties in future variations of wave climate in the Japan Sea, but the high probability of variations in daily wave climate is recognized, based on the future wave projections. Variations in daily wave climate are important because they could affect the topography and environment of the coast through long-term repetitive actions.

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Shin, Changsoo. „Sponge boundary condition for frequency‐domain modeling“. GEOPHYSICS 60, Nr. 6 (November 1995): 1870–74. http://dx.doi.org/10.1190/1.1443918.

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Several techniques have been developed to get rid of edge reflections from artificial boundaries. One of them is to use paraxial approximations of the scalar and elastic wave equations. The other is to attenuate the seismic waves inside the artificial boundary by a gradual reduction of amplitudes. These techniques have been successfully applied to minimize unwanted seismic waves for time‐domain seismic modeling. Unlike time‐domain seismic modeling, suppression of edge reflections from artificial boundaries has not been successful in frequency‐domain seismic modeling. Rayleigh waves caused by coupled motions of P‐ and S‐waves near the surface have been a particularly difficult problem to overcome in seismic modeling. In this paper, I design a damping matrix for frequency‐ domain modeling that damps out seismic waves by adding a diffusion term to the wave equation. This technique can suppress unwanted seismic waves, including Rayleigh waves and P‐ and S‐waves from an artificial boundary.

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Dissertationen zum Thema "Wave condition"

Jafari, Alireza. „Analysis and Prediction of Wave Transformation from Offshore into the Surfzone under Storm Condition“. Thesis, Griffith University, 2013. http://hdl.handle.net/10072/366745.

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Surfzone wave transformation under storm conditions is investigated through field and laboratory measurements in this study. The observations have been used to examine currently available models of wave energy dissipation. Detailed field data has been collected by means of a novel method which was first introduced by Nielsen (1988). This method has been utilised through a common program between Griffith University and The University of Queensland at The Spit on the Gold Coast in Southeast Queensland. The facility primarily consists of a manometer tube array with 12 different manometer tube lengths varying from 60 m to 500 m offshore and a concrete manhole excavated into the dune system to house the monitoring station. Accordingly, this system has enabled the monitoring of a detailed wave height profile across the surfzone under any conditions from the safety of the “bunker” on land. The findings of new laboratory experiments on the frequency response of the semi-rigid manometer tubes are also presented which extend and improve upon the previous work of Nielsen et al. (1993). Testing was conducted over a range of frequencies (0.0067 Hz< f <2 Hz) and tube lengths (10 m< L <900 m). New frequency response factors are determined by fitting the semiempirical gain function of Nielsen et al. (1993) to the observed gain data. As a result, new predictive formulas for the empirical coefficients as a function of tube parameters are provided in this study. Wave induced pore pressure in the surfzone seabed is investigated based on the recorded field data. Two well-known models, i.e. Hsu and Jeng (1994) and Sleath (1970), are assessed against the field measurements. The findings validate the accuracy of the models and indicate that the extent of energy dissipation due to the overlying sand is less than 5% and depends on the incident wave length.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text

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Thompson, Paul. „Statistical techniques for extreme wave condition analysis in coastal design“. Thesis, University of Plymouth, 2009. http://hdl.handle.net/10026.1/2636.

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The study of the behaviour of the extreme values of a variable such as wave height is very important in engineering applications such as flood risk assessment and coastal design. Storm wave modelling usually adopts a univariate extreme value theory approach, essentially identifying the extreme observations of one variable and fitting a standard extreme value distribution to these values. Often it is of interest to understand how extremes of a variable such as wave height depend on a covariate such as wave direction. An important associated concept is that of return level, a value that is expected to be exceeded once in a certain time period. The main areas of research discussed in this thesis involve making improvements to the way that extreme observations are identified and to the use of quantile regression as an alternative methodology for understanding the dependence of extreme values on a covariate. Both areas of research provide developments to existing return level methodology so enhancing the accuracy of predicted future storm wave events. We illustrate the methodology that we have developed using both coastal and offshore wave data sets. In particular, we present an automated and computationally inexpensive method to select the threshold used to identify observations for extreme value modelling. Our method is based on the distribution of model parameter estimates across a range of thresholds. We also assess the effect of the uncertainty associated with threshold selection on return level estimation by using a bootstrap procedure. Furthermore, we extend our approach so that the selection of the threshold can also depends on the value of a covariate such as wave direction. As a biproduct of our methodological development we have improved existing techniques for estimating and making inference about the parameters of a standard extreme value distribution. We also present a new technique that extends existing Bayesian quantile regression methodology by modelling the dependence of a quantile of one variable on the values of another using a natural cubic spline. Inference is based on the posterior density of the spline and an associated smoothing parameter and is performed by means of a specially tuned Markov chain Monte Carlo algorithm. We show that our nonparametric methodology provides more flexible modelling than the current polynomial based approach for a range of examples.

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Huang, Huan. „An experimental study of particle sizing in static condition and in shear flow by diffusing-wave spectroscopy“. Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/8273/.

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This thesis focuses on the micro/nanoparticle size measurement by using Diffusing-wave Spectroscopy, investigating the laser power and concentration effect on the measurement and researching the measuring method for particles in shear flow. A DWS-CCD backscattering experiment set-up was used in this project. By using this set-up, in all about 2000 experiments were performed during the project, including system testing, laser power influence study, concentration effect study and shear flow study. In the beginning, a detailed analysis of the particle sizing for particles in static condition was carried out by summarising the principles and procedures. The results revealed that the experimental set-up in this work was reliable and repeatable. A calibration process was still required for the CCD’s frame rate and resolution, the light absorption and the CCD’s position in the set-up. After determining some important parameters, the research was extended to laser power and concentration influence study. The autocorrelation functions were produced under different laser power and for different concentration of particle solution. Analysis confirmed the influences, and the results were expressed in formulas to describe specific effects for laser power and solution concentration. Based on the formulas, new equations for particle sizing were derived for different concentration ranges. After that, particle’s motion and light scattering in shear flow were investigated. It was concluded that three regions could be used to describe the particle’s movement under shear force; in different regions, the autocorrelation functions were different due to the variation of the characteristic time scales. The Brownian motion and shear strain dominated particle’s movement under specific flow velocities. Therefore, for particles subjected to high flow velocities, a new particle sizing formula was produced to distinguish the general formula which was only valid for particles under Brownian motion. Contributions made by this research are applying DWS application to micro/nanoparticle sizing in different conditions. In static condition, the laser power and concentration influence were described in formulas; new equations were produced for particle sizing for different concentration range. In shear flow, the thresholds of Brownian motion domination and shear flow domination were found; a new particle sizing equation was derived for particles only controlled by shear force.

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Yin, Huicheng. „Formation and construction of a shock wave for 3-D compressible Euler equations with spherical initial data“. Universität Potsdam, 2002. http://opus.kobv.de/ubp/volltexte/2008/2626/.

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In this paper, the problem on formation and construction of a shock wave for three dimensional compressible Euler equations with the small perturbed spherical initial data is studied. If the given smooth initial data satisfies certain nondegenerate condition, then from the results in [20], we know that there exists a unique blowup point at the blowup time such that the first order derivates of smooth solution blow up meanwhile the solution itself is still continuous at the blowup point. From the blowup point, we construct a weak entropy solution which is not uniformly Lipschitz continuous on two sides of shock curve, moreover the strength of the constructed shock is zero at the blowup point and then gradually increases. Additionally, some detailed and precise estimates on the solution are obtained in the neighbourhood of the blowup point.

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Ali, Syed Mahmood. „Plane wave scattering from circular and hollow circular slit cylinders using the On Surface Radiation Condition (OSRC) approach“. Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA243793.

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Thesis (M.S. in Electrical and Computer Engineering)--Naval Postgraduate School, December 1990.
Thesis Advisor(s): Janaswamy, R. Second Reader: Adler, Richard W. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Descriptor(s): Linear systems, thickness, scattering, polarization, distribution, formulations, integrals, shape, structures, theses, electromagnetic wave propagation, reflection, surfaces, surface properties, wave propagation, cylindrical bodies, width, integral equations, frequency domain, plane waves, circular, truncation, concave bodies, convex bodies, radiation DTIC Identifier(s): Radar reflections, hollow cylinders, slit cylinders, OSRC (on surface radiation condition). Author(s) subject terms: Surface radiation conditions; transverse electric; circular cylinders; hollow cylinder slit cylinders Includes bibliographical references (p. 68-69 ). Also available in print.

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Haidar, El-Abed. „Analysis of the modification of four-wave mixing phase matching by stimulated Brillouin scattering“. Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17062.

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My thesis is a theoretical and numerical investigation of the feasibility of enhancing the four wave mixing bandwidth by tuning the phase matching condition via stimulated Brillouin scattering. This technique was experimentally demonstrated in 2013 by introducing the amplitude and phase optical gain/loss frequency responses of stimulated Brillouin scattering (SBS) pump and Stokes waves onto the FWM pump or the FWM signal. Both SBS amplitude and phase responses originate from modifying the refractive index of the optical fibre while the FWM interaction takes place. As a result the FWM phase-matching condition and hence the signal gain can be flexibly controlled. The theoretical investigation was carried out with both processes considered separately. In this thesis, we show that with modest optical power, exponential gain is achievable for normal dispersion, which leads to a gain bandwidth which is comparable in size to that for anomalous dispersion without SBS. This is equivalent to a sign change of the nonlinear contribution to the phase matching condition. However the method is limited by SBS-induced power variations and by the need to limit the SBS power levels. The thesis is illustrated while using highly nonlinear silica fibre, a well-known platform for efficient gain in telecommunications as an example. Our results can be equally applied to other materials and to other geometries, for example that of chalcogenide photonic chips, which is an interesting and exciting platform for all-optical signal processing devices. This platform is considered in Chapter 3.

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Hao, Gang. „Laboratory study of shear wave velocity and very small stain modulus of Macao marine clay under anisotropic stress condition“. Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1783644.

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Askari, Murtaza. „High efficiency devices based on slow light in photonic crystals“. Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39558.

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Photonic crystals have allowed unprecedented control of light and have allowed bringing new functionalities on chip. Photonic crystal waveguides (PCWs), which are linear defects in a photonic crystal, have unique features that distinguish these waveguides from other waveguides. The unique features include very large dispersion, existence of slow light, and the possibility of tailoring the dispersion properties for guiding light. In my research, I have overcome some of the challenges in using slow light in PCWs. In this work, I have demonstrated (i) high efficiency coupling of light into slow group velocity modes of a PCW, (ii) large bandwidth high transmission and low dispersion bends in PCWs, (iii) accurate modeling of pulse propagation in PCWs, (iv) high efficiency absorbing boundary conditions for dispersive slow group velocity modes of PCWs. To demonstrate the utility of slow light in designing high efficiency devices, I have demonstrated refractive index sensors using slow light in PCWs. In the end, a few high efficiency devices based on slow light in PCWs are mentioned. The remaining issues in the widespread use of PCW are also discussed in the last chapter.

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Gunasekaran, Barani. „Development and validation of a pressure based CFD methodology for acoustic wave propagation and damping“. Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8740.

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Combustion instabilities (thermo-acoustic pressure oscillations) have been recognised for some time as a problem limiting the development of low emissions (e.g., lean burn) gas turbine combustion systems, particularly for aviation propulsion applications. Recently, significant research efforts have been focused on acoustic damping for suppression of combustion instability. Most of this work has either been experimental or based on linear acoustic theory. The last 3-5 years has seen application of density based CFD methods to this problem, but no attempts to use pressure-based CFD methods which are much more commonly used in combustion predictions. The goal of the present work is therefore to develop a pressure-based CFD algorithm in order to predict accurately acoustic propagation and acoustic damping processes, as relevant to gas turbine combustors. The developed computational algorithm described in this thesis is based on the classical pressure-correction approach, which was modified to allow fluid density variation as a function of pressure in order to simulate acoustic phenomena, which are fundamentally compressible in nature. The fact that the overall flow Mach number of relevance was likely to be low ( mildly compressible flow) also influenced the chosen methodology. For accurate capture of acoustic wave propagation at minimum grid resolution and avoiding excessive numerical smearing/dispersion, a fifth order accurate Weighted Essentially Non-Oscillatory scheme (WENO) was introduced. Characteristic-based boundary conditions were incorporated to enable accurate representation of acoustic excitation (e.g. via a loudspeaker or siren) as well as enable precise evaluation of acoustic reflection and transmission coefficients. The new methodology was first validated against simple (1D and 2D) but well proven test cases for wave propagation and demonstrated low numerical diffusion/dispersion. The proper incorporation of Characteristic-based boundary conditions was validated by comparison against classical linear acoustic analysis of acoustic and entropy waves in quasi-1D variable area duct flows. The developed method was then applied to the prediction of experimental measurements of the acoustic absorption coefficient for a single round orifice flow. Excellent agreement with experimental data was obtained in both linear and non-linear regimes. Analysis of predicted flow fields both with and without bias flow showed that non-linear acoustic behavior occurred when flow reversal begins inside the orifice. Finally, the method was applied to study acoustic excitation of combustor external aerodynamics using a pre-diffuser/dump diffuser geometry previously studied experimentally at Loughborough University and showed the significance of boundary conditions and shear layer instability to produce a sustained pressure fluctuation in the external aerodynamics.

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Bly, Elizabeth Ann. „Generation X and the Invention of a Third Feminist Wave“. Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1259803398.

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Thesis (Ph. D.)--Case Western Reserve University, 2010.
Title from PDF (viewed 2009-12-30). Department of History. Includes abstract. Includes bibliographical references and appendices. Available online via the OhioLINK ETD Center.

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Bücher zum Thema "Wave condition"

Kapdasli, M. S. Threshold condition of sand particles under co-directional combined wave-and-current flow. Wallingford: Hydraulics Research on behalf of the Department of the Environment, 1985.

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Harloff, G. J. Numerical simulation of supersonic flow using a new analytical bleed boundary condition. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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1969-, Dicker Rory Cooke, und Piepmeier Alison, Hrsg. Catching a wave: Reclaiming feminism for the 21st century. Boston: Northeastern University Press, 2003.

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NATO meets the post-strategic condition: Political vicissitudes and theoretical puzzles in the alliance's first wave of adaptation, 1990-1997. Münster: Lit, 1998.

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author, Zhu Ning Yan, und Institution of Engineering and Technology, Hrsg. Scattering of waves by wedges and cones with impedance boundary conditions. Edison, NJ: Scitech Publishing, an imprint of the IET, 2013.

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United States. National Aeronautics and Space Administration., Hrsg. Asymptotic boundary conditions for dissipative waves: General theory. [Washington, D.C.]: NASA, 1990.

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Banks, H. Thomas. A comparison of time domain boundary conditions for acoustic waves in wave guides. Hampton, Va: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1991.

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Jun, Fang, Kurbatskii Konstantin A und United States. National Aeronautics and Space Administration., Hrsg. Inhomogeneous radiation boundary conditions simulating incoming acoustic waves for computational aeroacoustics. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Institute for Computer Applications in Science and Engineering., Hrsg. On absorbing boundary conditions for linearized Euler equations by a perfectly matched layer. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1995.

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Trefethen, Lloyd N. Well-posedness of one-way wave equations and absorbing boundary conditions. Hampton, Va: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1985.

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Buchteile zum Thema "Wave condition"

Pieczonka, Łukasz, Piotr Kohut, Kajetan Dziedziech, Tadeusz Uhl und Wiesław J. Staszewski. „Experimental Investigation of Crack-Wave Interactions for Structural Damage Detection“. In Applied Condition Monitoring, 109–16. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62042-8_10.

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Ajili, R., O. Bareille, M. L. Bouazizi, M. N. Ichchou und N. Bouhaddi. „Parameter Identification of a Sandwich Beam Using Numerical-Based Inhomogeneous Wave Correlation Method“. In Applied Condition Monitoring, 65–75. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41459-1_7.

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Grote, Marcus J., und Christoph Kirsch. „Dirichlet-to-Neumann Boundary Condition for Multiple Scattering Problems“. In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 263–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_42.

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Wodecki, Jacek, Anna Michalak, Paweł Stefaniak, Agnieszka Wyłomańska und Radosław Zimroz. „Combination of Kolmogorov-Smirnov Statistic and Time-Frequency Representation for P-Wave Arrival Detection in Seismic Signal“. In Applied Condition Monitoring, 166–74. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22529-2_9.

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Cao, Zhuangqi, und Cheng Yin. „Exact Quantization Condition via Analytical Transfer Matrix Method“. In Advances in One-Dimensional Wave Mechanics, 47–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40891-5_4.

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Li, Jingrong, und Ye Lu. „Guided Wave Based Debonding Detection in CFRP-Reinforced Steel Structures“. In Advances in Asset Management and Condition Monitoring, 1013–21. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57745-2_84.

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Badi, M. N. M., D. E. Johnson und G. J. Trmal. „The Use of Stress Wave Sensors for the Diagnosis of Bearing Faults“. In Condition Monitoring and Diagnostic Engineering Management, 20–25. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0431-6_4.

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Ruggeri, Tommaso, und Masaru Sugiyama. „Acceleration Wave, K-Condition, and Global Existence in ET6“. In Rational Extended Thermodynamics beyond the Monatomic Gas, 293–98. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13341-6_14.

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Holroyd, Trevor J., und Simon King. „Stress Wave Sensing — A New Measurand for Condition Monitoring“. In COMADEM 89 International, 530–34. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-8905-7_85.

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Ruggeri, Tommaso, und Masaru Sugiyama. „Acceleration Wave, K-condition, and Global Existence in ET6“. In Classical and Relativistic Rational Extended Thermodynamics of Gases, 439–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59144-1_20.

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Konferenzberichte zum Thema "Wave condition"

Kawata, Yoshiaki. „Wave Breaking under Storm Condition“. In 24th International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1995. http://dx.doi.org/10.1061/9780784400890.026.

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Engebretsen, Espen, Sverre K. Haver und Dag Myrhaug. „Extreme Wave Condition at Doggerbank“. In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23687.

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In design of offshore wind turbines, extreme wave conditions are of interest. Usually, the design wave condition is taken as the sea state corresponding to an annual exceedance probability of 2·10−2, i.e. a return period of 50 years. A possible location for a future wind farm, consisting of bottom fixed wind turbines, is the Doggerbank area, see Figure 1. The water depth in this area varies from about 60m in the north to about 20m in the south. The hindcast database NORA10 provides sea state characteristics from 1957 to present over a domain covering Doggerbank. Regarding the deeper areas just north of Doggerbank, this hindcast model is found to be of good quality. Larger uncertainties are associated with the hindcast results as we approach shallower water further south. The purpose of the present study is to compare sea state evolution over Doggerbank as reflected by NORA10 with the results of commonly used shallow water hindcast model SWAN. The adequacy of the default parameters of SWAN for reflecting changes in wave conditions over a sloping bottom is investigated by comparison with model test results. Extreme wave conditions for two locations 102.5km apart in a north–south direction are established using NORA10. This is done using both an all sea states approach and a peak over threshold approach. Assuming the extremes for the northern position to represent good estimates, the wave evolution southwards is analyzed using SWAN. The extreme condition obtained from NORA10 in the northern position is used as input to SWAN and the results from the two hindcast models are compared in the southern position. SWAN seems to suggest a somewhat faster decay over Doggerbank compared to NORA10.

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Chater, A. „Locomotive diesel engine stress wave analysis“. In IET International Conference on Railway Condition Monitoring. IEE, 2006. http://dx.doi.org/10.1049/ic:20060055.

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Junhua Liu, Ming Yao, Chengjun Huang, Jiang Wang, Lixue Li und Xiuchen Jiang. „Investigation of PD electromagnetic wave characteristics in GIS“. In 2008 International Conference on Condition Monitoring and Diagnosis. IEEE, 2008. http://dx.doi.org/10.1109/cmd.2008.4580239.

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Gao, Qiang, Wei Wang, Zhiqiang Qi und Lianming Chen. „Development of Two-in-one Test Device for Oscillating Wave and 0.1Hz Cosine Square Wave“. In 2020 8th International Conference on Condition Monitoring and Diagnosis (CMD). IEEE, 2020. http://dx.doi.org/10.1109/cmd48350.2020.9287213.

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Zeng, Zijing, Jianwen Wang, Yue Hu, Zhicheng Wang und Hongyi Huang. „Analysis of Time-Frequency Characteristics of PD Electromagnetic Wave Based on Electromagnetic Simulation“. In 2018 Condition Monitoring and Diagnosis (CMD). IEEE, 2018. http://dx.doi.org/10.1109/cmd.2018.8535874.

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Ju-Chu Hsieh, Cheng-Chi Tai, Ching-Chau Su, Chien-Yi Chen, Jiann-Fuh Chen und Yu-Hsun Lin. „The transmission characteristics of sound wave in power cable“. In 2008 International Conference on Condition Monitoring and Diagnosis. IEEE, 2008. http://dx.doi.org/10.1109/cmd.2008.4580510.

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Sava, Paul, und Oleg Poliannikov. „Interferometric imaging condition for wave‐equation migration“. In SEG Technical Program Expanded Abstracts 2007. Society of Exploration Geophysicists, 2007. http://dx.doi.org/10.1190/1.2792950.

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Sava, Paul. „Stererographic imaging condition for wave‐equation migration“. In SEG Technical Program Expanded Abstracts 2007. Society of Exploration Geophysicists, 2007. http://dx.doi.org/10.1190/1.2792932.

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Wang, Chenlong, Jiubing Cheng und Børge Arntsen. „Imaging Condition for Converted Waves Based on Decoupled Elastic Wave Modes“. In SEG Technical Program Expanded Abstracts 2015. Society of Exploration Geophysicists, 2015. http://dx.doi.org/10.1190/segam2015-5920952.1.

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Berichte der Organisationen zum Thema "Wave condition"

Nestleroth. L52298 Augmenting MFL Tools With Sensors that Assess Coating Condition. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), März 2009. http://dx.doi.org/10.55274/r0010396.

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External coatings are routinely used to protect transmission pipelines from corrosion; however, coatings may degrade or disbond over time enabling corrosion to occur. Transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools to detect metal loss corrosion defects. Rather than finding the cause of a problem, failure of the coating within a corrosive environment, MFL corrosion surveys only find the result of the problem, corrosion defects that may permanently alter the pressure carrying capacity of the pipeline. Stress corrosion cracking (SCC) can be detected using in-line inspection (ILI) technology, but the availability of tools is limited and the cost of inspection is high compared to MFL inspection. SCC almost always occurs at coating faults; direct coating assessment could indicate future problems that could degrade the serviceability of the pipeline. In this project, a new sensor was developed to assess external coating that could work with currently available ILI tools for minimal additional cost to perform the inspection. The sensors, electromagnetic acoustic transducers (EMATs), generate ultrasonic waves that are guided by the pipe material around the circumference of the pipe. The coating material and adherence can influence the propagation of the ultrasonic waves; changes in ultrasonic signal features were attributed to coating faults. This development used modeling and experiments to establish a more optimal configuration for coating assessment. A multiple feature approach was used. A commonly used feature, signal amplitude, provided good sensitivity to coating condition but was influenced by inspection variables. One unique feature identified in this development is arrival time of the ultrasonic wave. For the wave type and frequency selected, the wave velocity was different for bare and coated pipe. Therefore, disbonded or missing coating can be detected by monitoring arrival time of the ultrasonic wave, a feature that is amplitude independent. Another feature for assessing coating, absorption of selective frequencies, was also demonstrated. Coating assessment capability was experimentally demonstrated using a prototype EMAT ILI tool. All three detection features were shown to perform well in an ILI environment as demonstrated at Battelle"s Pipeline Simulation Facility and BJ Inspection Services pull rigs. Improvement to the prototype occurred between each test; the most significant improvement was the design and construction of a novel set of thick-trace transmitting and receiving Printed Circuit Board (PCB) EMAT coils. Implementation variables such as moisture and soil loading were shown to have a minimal influence on results.

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Brashaw, Brian K., Robert J. Vatalaro, James P. Wacker und Robert J. Ross. Condition assessment of timber bridges. 2, Evaluation of several stress-wave tools. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2005. http://dx.doi.org/10.2737/fpl-gtr-160.

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Todd, Michael, und Francesco Lanza di Scalea. Proof-of-Concept Studies in Novel Guided Wave Methods for Metallic Structural Condition. Fort Belvoir, VA: Defense Technical Information Center, März 2009. http://dx.doi.org/10.21236/ada500515.

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Zhao, George, Grang Mei, Bulent Ayhan, Chiman Kwan und Venu Varma. DTRS57-04-C-10053 Wave Electromagnetic Acoustic Transducer for ILI of Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), März 2005. http://dx.doi.org/10.55274/r0012049.

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In this project, Intelligent Automation, Incorporated (IAI) and Oak Ridge National Lab (ORNL) propose a novel and integrated approach to inspect the mechanical dents and metal loss in pipelines. It combines the state-of-the-art SH wave Electromagnetic Acoustic Transducer (EMAT) technique, through detailed numerical modeling, data collection instrumentation, and advanced signal processing and pattern classifications, to detect and characterize mechanical defects in the underground pipeline transportation infrastructures. The technique has four components: (1) thorough guided wave modal analysis, (2) recently developed three-dimensional (3-D) Boundary Element Method (BEM) for best operational condition selection and defect feature extraction, (3) ultrasonic Shear Horizontal (SH) waves EMAT sensor design and data collection, and (4) advanced signal processing algorithm like a nonlinear split-spectrum filter, Principal Component Analysis (PCA) and Discriminant Analysis (DA) for signal-to-noise-ratio enhancement, crack signature extraction, and pattern classification. This technology not only can effectively address the problems with the existing methods, i.e., to detect the mechanical dents and metal loss in the pipelines consistently and reliably but also it is able to determine the defect shape and size to a certain extent.

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Bryant, Duncan, Mary Bryant, Jeremy Sharp, Gary Bell und Christine Moore. The Response of Vegetated Dunes to Wave Attack. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41580.

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Vegetation is believed to increase the stability of dunes during wave attack, but limited data is available. A physical model study was performed to evaluate changes in the dune stability with and without biomass, both above and belowground. The above and belowground biomass was modeled using wooden dowels and coir fibers, respectively. For both the collision and overwash storm impact regimes, the results of this study clearly demonstrate that the inclusion of biomass in the model dune reduces the erosion and overwash. The combination of both above and belowground biomass was the most effective at reducing erosion followed by belowground biomass, with aboveground biomass providing the smallest benefit regardless of the wave condition and water level. Additionally, the overwash of sediment and water was decreased with the inclusion of biomass, following the same trends as the erosion. As the dune eroded, the storm impact regime transitioned from collision to overwash. The inclusion of biomass delays this transition in storm impact regime, providing greater protection to coastal communities. This study highlights the need to consider dune vegetation for dune construction and coastal planning.

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Haskins, Richard W., James A. Evans und Robert M. Ebeling. Corrosion Induced Loss of Capacity and Development of a Guided Wave Condition Assessment Method for Multistrand Anchor Systems Used in Corps Projects. Fort Belvoir, VA: Defense Technical Information Center, August 2014. http://dx.doi.org/10.21236/ada608714.

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Wu, Chiu-Feng, Tzu-Pei Yeh, Tzu-Chen Lin, Po-Hsiang Huang und Pin-Jui Huang. Effects of far infrared therapy in Hemodialysis Arterio-Venous Fistula Maturation: A Meta-analysis and Systematic Review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2023. http://dx.doi.org/10.37766/inplasy2023.4.0020.

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Review question / Objective: Participant Type: Only for any ESRD patient diagnosed with CKD and established AVF and requiring regular HD treatment with AVF. Intervention type: Studies using FIR therapy versus non- FIR therapy. Outcome Measure Types: Fistula maturation, patency, access blood flow, AVF I.D.; fistula occlusion. P: Patients under hemodialysis. Condition being studied: Far infrared is an invisible electromagnetic wave. Far infrared therapy (FIR) uses low-power electromagnetic waves emitted by FIR with wavelengths of 3-100 µm to improve human physiological functions. Previous studies have shown that FIR can effectively suppress inflammation, and in recent years it has also been widely used in the clinical treatment of various diseases, such as cardiovascular diseases. The use of FIR allows the improvement of AVF blood flow and patency not only through local vasodilation induced by thermal effects, but more importantly, through non-thermal effects that improve endothelial function.

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Abdolmaleki, Kourosh. PR-453-134504-R05 On Bottom Stability Upgrade - MS III. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 2021. http://dx.doi.org/10.55274/r0012195.

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The extension of the PRCI on bottom stability (OBS) software's applicability to shallow water is assessed. Version 3 of the software has a limitation on water depth; only depths greater than 6 m (20 ft) are accepted. This limitation is likely related to the increasing inaccuracy of linear wave theory as the wave height to water depth ratio increases, as well as caution about breaking wave limits. The usage of linear wave theory inside the software can be categorized into two different types: � Linear regular waves - these are used in the Level 1 module to determine the motions of the water particles as part of the calculation of the hydrodynamic forces; � Linear irregular waves - these are present in the Level 2, Level 3 and ASM modules, where the surface wave energy spectra are converted to the near-seabed wave velocities through the use of a transfer function based on linear wave theory. It is noted that for irregular waves, all wave spectral formulations currently implemented in the OBS software, do not account for water depth. This document addresses the finite water depth and shallow water restrictions and presents a discussion and investigation in two categories: 1. The direct use of the linear theory to describe waves in the Level 1 calculation module; and 2. The direct use of linear spectral transfer functions in the Level 2, Level 3, and ASM modules. The scope of this activity is to prepare a solution for consideration by PRCI and implement the agreed course of action. The solution proposed will be based on the continued use of the linear wave theory. It is noted that higher order wave theories would be more appropriate for shallow water conditions, but due to the currently established methodology in the software, implementation of higher order wave theory is not included within this scope.

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Bain, Rachel, Richard Styles und Jared Lopes. Ship-induced waves at Tybee Island, Georgia. Engineer Research and Development Center (U.S.), Dezember 2022. http://dx.doi.org/10.21079/11681/46140.

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Commercial vessels transiting the Savannah entrance channel intermittently generate large wake events at Tybee Island, Georgia, creating a potential hazard for beachgoers. However, not all commercial vessels generate large wakes, and the relationship between vessel dimensions, operating conditions, wake height, and drawdown magnitude is unclear. This study evaluates bathymetric data, high-frequency wave and vessel wake measurements, and broadcast vessel identification over a 4-month period with the goal of providing a quantitative characterization of vessel wake conditions at Tybee Island. Data from 1,386 cargo vessel passages and 202 tanker passages indicate that vessel dimensions (length and beam) are positively correlated with drawdown magnitude and secondary wake height, although large vessels do not consistently generate large wakes. Container ships, which tended to travel faster than tankers, corresponded to the largest wakes in the dataset. A further hypothesis is that tidally modulated energy dissipation may favor smaller vessel wake uprush at low tide and larger uprush at high tide, but this idea cannot be confirmed without additional measurements to quantify nonlinear wave propagation on the beach face. Based on the collected data, the study concludes with four recommendations for reducing risk to beachgoers.

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Quarry, Mike. PR-462-143703-R01 Development and Evaluation of Guided Wave Structural Health Monitoring for Buried Pipe. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), Mai 2019. http://dx.doi.org/10.55274/r0011594.

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Excavations to inspect buried piping are often costly and risk damaging other plant assets during the digging. Some utilities have used permanently installed guided wave sensors to monitor piping condition and reduce the excavations. The project that is the subject of this report has two objectives-to evaluate the current state-of-the-art and to create a test bed for vendors to improve their technology and data analysis algorithms. Understanding the state-of-the-art will enable utilities to effectively use guided wave structural health monitoring in support of their underground piping aging management plans and their license renewal activities. Guided wave effectiveness in buried pipe applications depends on many variables, including coating, backfill, temperature, soil moisture, and environmental noise. An important aspect of monitoring is the effectiveness of data analysis algorithms in distinguishing changes in data due to damage to the pipe wall from those resulting from the environment. A buried mockup was constructed with common coatings and backfills, and two vendors installed commercially available guided wave systems. An initial flaw set was initiated in the mockup. Then, about every three months, holes were dug to modify some existing flaws, initiate new flaws, and leave some unchanged. Data were collected over a timeframe that included all four seasons. Damage was generally initiated with grinding tools to produce irregular shapes and sizes and to simulate corrosion. Flaws were characterized with a structured white light camera technology. Flaw information was kept confidential from the vendors until all data were complete and vendors had provided their assessment of the mockup at each stage. After the results were reviewed with the vendors, the flaw information at each stage was provided to the vendors for continued development of their technology. This enables the vendors to conduct lessons learned and improve their procedures, data analysis algorithms, and hardware designs. Utility operators can use the results of this report to better apply guided wave structural health monitoring technology. Benefits will also result from lessons learned and improvements by vendors. It is better for vendors to learn about needed improvements and data analysis through a test bed than to find them out in the field. The buried pipe mockup also provides a potential test bed for future studies and evaluations of structural health monitoring technologies or in-line pipe devices.

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