Relevant bibliographies by topics / Wavenumber-Frequency Spectral Analysis

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Wavenumber-Frequency Spectral Analysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2023

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Journal articles on the topic "Wavenumber-Frequency Spectral Analysis"

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Geoga, Christopher J., Charlotte L. Haley, Andrew R. Siegel, and Mihai Anitescu. "Frequency–wavenumber spectral analysis of spatio-temporal flows." Journal of Fluid Mechanics 848 (June 8, 2018): 545–59. http://dx.doi.org/10.1017/jfm.2018.366.

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We propose a fully spatio-temporal approach for identifying spatially varying modes of oscillation in fluid dynamics simulation output by means of multitaper frequency–wavenumber spectral analysis. One-dimensional spectrum estimation has proven to be a valuable tool in the analysis of turbulence data applied spatially to determine the rate of energy transport between spatial scales, or temporally to determine frequencies of oscillatory flows. It also allows for the quantitative comparison of flow characteristics between two scenarios using a standard basis. It has the limitation, however, that
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Meek, R. A., and A. A. Vassiliou. "Characterizing three‐dimensional wavefields with high‐resolution spectra." GEOPHYSICS 57, no. 4 (1992): 522–31. http://dx.doi.org/10.1190/1.1443266.

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Three‐dimensional spectra (frequency‐x‐wavenumber‐y‐wavenumber or [Formula: see text] spectra) can be used to determine the frequency content, velocity, and direction of waves entering an array of receivers. This information is important in detecting aliasing problems, understanding coherent noise, designing arrays, and determining parameters for coherent noise filters. Because of the limited spatial dimensions of most arrays the discrete Fourier transform produces an estimate of the three‐dimensional (3-D) spectrum with severe wavenumber distortion. We extend a 2-D hybrid spectral estimation
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Ciani, Francesco S., Paolo Bonfiglio, and Stefano Piva. "IWC Analysis of Turbulent Plume Fires." Tecnica Italiana-Italian Journal of Engineering Science 65, no. 2-4 (2021): 196–200. http://dx.doi.org/10.18280/ti-ijes.652-408.

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Plumes fires are characterized by a turbulent nature with a large number of different scales. LES is used to solve the largest structures and to model the smallest ones. Grid size and time steps become decisive to place a limit between solved and modelled turbulence. A spectral analysis, both in frequency and wavenumber domain of the specific turbulent kinetic energy is an instrument to check for the information investigated. Unfortunately, the spectra in the wavenumber domain can be difficult to achieve adequately, because the specific turbulent kinetic energy values should be available in ma
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Ciani, F. S., P. Bonfiglio, and S. Piva. "On the Solved Turbulent Scales in Turbulent Plume Fires." Journal of Physics: Conference Series 2509, no. 1 (2023): 012008. http://dx.doi.org/10.1088/1742-6596/2509/1/012008.

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Abstract Plume fires are characterized by a turbulent nature with a large number of different scales. LES is often used to solve the largest structures and to model the smallest ones. Grid size and time steps become decisive to place the limit between resolved and modelled turbulence. Significant information on this limit and its placement can be obtained with spectral analyses of the specific turbulent kinetic energy. While frequency analysis is relatively easy, an analysis in the wavenumber domain is more challenging. The IWC method, typically used in structures and acoustics, is used here f
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Berloff, P., and I. Kamenkovich. "On Spectral Analysis of Mesoscale Eddies. Part II: Nonlinear Analysis." Journal of Physical Oceanography 43, no. 12 (2013): 2528–44. http://dx.doi.org/10.1175/jpo-d-12-0233.1.

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Abstract Several turbulent flow regimes of an idealized ocean circulation model are systematically analyzed in physical and spectral domains. Zonal dispersion properties of transient mesoscale eddies are described by the zonal wavenumber/temporal frequency spectra. The eddy patterns and the corresponding nonlinear eddy forcing exerted on the jets are examined by filtering different parts of the spectra. Comparison of the outcome of this nonlinear analysis with the properties of the linearized solutions (obtained in Part I of this paper) demonstrates that a very substantial part of the flow dyn
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Schmitt, Denis P., and Michel Bouchon. "Full‐wave acoustic logging: synthetic microseismograms and frequency‐wavenumber analysis." GEOPHYSICS 50, no. 11 (1985): 1756–78. http://dx.doi.org/10.1190/1.1441865.

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The discrete wavenumber method is used to compute synthetic full‐waveform acoustic logs in axisymmetric multilayered boreholes and to perform the frequency‐wavenumber analysis of the radiated wave field. The stress‐displacement vector is propagated through the layers using a numerically improved formulation of the Thomson‐Haskell method. In the time domain, all the trapped and interface modes overlap. On the contrary, the representations of the spectral energy density of the scattered wave field in the frequency axial‐wavenumber domain, for various radial positions of observation, allow the re
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Tchilibou, Michel, Lionel Gourdeau, Rosemary Morrow, Guillaume Serazin, Bughsin Djath, and Florent Lyard. "Spectral signatures of the tropical Pacific dynamics from model and altimetry: a focus on the meso-/submesoscale range." Ocean Science 14, no. 5 (2018): 1283–301. http://dx.doi.org/10.5194/os-14-1283-2018.

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Abstract. The processes that contribute to the flat sea surface height (SSH) wavenumber spectral slopes observed in the tropics by satellite altimetry are examined in the tropical Pacific. The tropical dynamics are first investigated with a 1∕12∘ global model. The equatorial region from 10∘ N to 10∘ S is dominated by tropical instability waves with a peak of energy at 1000 km wavelength, strong anisotropy, and a cascade of energy from 600 km down to smaller scales. The off-equatorial regions from 10 to 20∘ latitude are characterized by a narrower mesoscale range, typical of midlatitudes. In th
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Prevosto, M., H. E. Krogstad, S. F. Barstow, and C. Guedes Soares. "Observations of the High-Frequency Range of the Wave Spectrum." Journal of Offshore Mechanics and Arctic Engineering 118, no. 2 (1996): 89–95. http://dx.doi.org/10.1115/1.2828828.

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This paper takes a new look at the high-frequency range of the wave spectrum. The analysis is based on data sets from two recent field campaigns offshore Portugal and Crete carried out in the MAST II WAVEMOD project, data from the WADIC experiment in the North Sea, and deep-sea data from Haltenbanken and Vo̸ringplata˚et offshore Norway. In addition, we also show spectra obtained by spectral inversion of ERS-1 SAR imagery. The influence and calibration of wave-measuring instrumentation and the use of wavenumber spectra when comparing spectra from shallow water is emphasized.
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Wunsch, Carl. "Toward a Midlatitude Ocean Frequency–Wavenumber Spectral Density and Trend Determination." Journal of Physical Oceanography 40, no. 10 (2010): 2264–81. http://dx.doi.org/10.1175/2010jpo4376.1.

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Abstract The time- and space-scale descriptive power of two-dimensional Fourier analysis is exploited to reanalyze the behavior of midlatitude variability as seen in altimetric data. These data are used to construct a purely empirical and analytical frequency–zonal wavenumber spectrum of ocean variability for periods between about 20 days and 15 yr and on spatial scales of about 200–10 000 km. The spectrum is dominated by motions along a “nondispersive” line, which is a robust feature of the data but for whose prominence a complete theoretical explanation is not available. The estimated spectr
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Pan, Yulin, Brian K. Arbic, Arin D. Nelson, et al. "Numerical Investigation of Mechanisms Underlying Oceanic Internal Gravity Wave Power-Law Spectra." Journal of Physical Oceanography 50, no. 9 (2020): 2713–33. http://dx.doi.org/10.1175/jpo-d-20-0039.1.

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AbstractWe consider the power-law spectra of internal gravity waves in a rotating and stratified ocean. Field measurements have shown considerable variability of spectral slopes compared to the high-wavenumber, high-frequency portion of the Garrett–Munk (GM) spectrum. Theoretical explanations have been developed through wave turbulence theory (WTT), where different power-law solutions of the kinetic equation can be found depending on the mechanisms underlying the nonlinear interactions. Mathematically, these are reflected by the convergence properties of the so-called collision integral (CL) a
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Dissertations / Theses on the topic "Wavenumber-Frequency Spectral Analysis"

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Kiranmayi, L. "Intraseasonal Variations In Sea Level Pressure And Association With Tropical Convection." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/765.

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This thesis deals with tropical intraseasonal variation (TISV) having time scales in 20-80 day range. Variations on this time scale have been observed to have profound influence on the weather and climate of the entire globe, and hence its study forms an important area of current research. A large number of studies have been carried out on this topic since the pioneering work of Madden and Julian in 1971. However, the observational studies are biased towards using the outgoing longwave radiation (OLR) as the variable of interest, and other variables, pressure in particular, have received less
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Kiranmayi, L. "Intraseasonal Variations In Sea Level Pressure And Association With Tropical Convection." Thesis, 2008. http://hdl.handle.net/2005/765.

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This thesis deals with tropical intraseasonal variation (TISV) having time scales in 20-80 day range. Variations on this time scale have been observed to have profound influence on the weather and climate of the entire globe, and hence its study forms an important area of current research. A large number of studies have been carried out on this topic since the pioneering work of Madden and Julian in 1971. However, the observational studies are biased towards using the outgoing longwave radiation (OLR) as the variable of interest, and other variables, pressure in particular, have received less
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Conference papers on the topic "Wavenumber-Frequency Spectral Analysis"

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Snarski, Stephen R. "Wavelet Analysis of Space-Varying Intermittent Wall Pressure Field of Transitional Boundary Layer." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45024.

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Measurements of the space-time fluctuating wall pressure field across the transition region of a flat plate zero pressure gradient boundary layer have been performed in an anechoic wind tunnel with a 64-element linear array of sub-miniature hearing-aid microphones (d+ = 15). Wavelet transforms are being used to quantify the structure and nonhomogeneous wavenumber-frequency spectral content of the field. The results illustrate that the fluctuations within the turbulent spots scale with those which exists in a fully developed turbulent boundary layer consistent with previous findings. The spectr
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Shi, C., J. Park, L. Manuel, and M. A. Tognarelli. "A Data-Driven Mode Identification Algorithm for Fatigue Damage Assessment in Instrumented Marine Risers." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50231.

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A well-established empirical procedure, which we refer to as Weighted Waveform Analysis (WWA), is employed to reconstruct a model riser’s response over its entire length using a limited number of strain measurements. The quality of the response reconstruction is controlled largely by identification of the participating riser response modes (waveforms); hence, mode selection is vital in WWA application. Instead of selecting a set of consecutive riser vibratory modes, we propose a procedure that automatically identifies a set of non-consecutive riser modes that can thus account for higher harmon
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Касаткин, С. Б. "IDENTIFICATION OF NORMAL WAVES FORMING A SOUND FIELD IN A SHALLOW SEA AT THE INFRASONIC FREQUENCY RANGE. Part I." In Физики геосфер. Crossref, 2020. http://dx.doi.org/10.35976/poi.2020.83.85.005.

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Анализируются результаты экспериментальных исследований звукового поля, зарегистрированного комбинированными приемниками, образующими вертикально ориентированную трехэлементную антенну. Звуковое поле формировалось шумами НИС «Юрий Молоков» в инфразвуковом диапазоне частот. Глубина моря и рабочий диапазон частот исключали возможность возбуждения нормальных волн дискретного спектра в модельном волноводе Пекериса. По результатам спектрального анализа шумового сигнала получена оценка потенциальной помехоустойчивости комбинированного приемника при использовании полного набора информативных параметр
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Apetre, Nicole, and Massimo Ruzzene. "Damage Measure in Complex 1D Waveguides." In ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-598.

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This paper introduces a wave propagation-based damage index (DI) which relies on the estimation of phase gradients of propagating waves for accurate damage localization and on the prediction of mode conversion coefficients for damage quantification. The undamaged, or unperturbed, reference response is derived directly from the damaged component, through the application of filtering procedures in the wavenumber/frequency domain. These procedures separate incident waves from reflections caused by structural discontinuities encountered along the wave path. The DI formulation is illustrated throug
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Wang, Xifeng, Kenta Mizushiri, Hiroshi Yokoyama, and Akiyoshi Iida. "Wavenumber-Frequency Spectrum Analysis of Pressure Fields Around an Automobile." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4806.

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Abstract In order to evaluate the interior noise caused by the flow around automobiles, it is necessary to clarify the nature of the pressure fluctuations on the surface of vehicle body. The pressure fluctuations around the vehicle which are caused by the fluid motion can be solved by unsteady-compressible Navier-Stokes equation. However, the differences between the scales and intensity of the pressure fluctuations related to the hydrodynamic pressure fluctuation (HPF) of the flow field and the aerodynamic sound (acoustic pressure fluctuation APF) are quite large, these phenomena can be consid
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Tian, Yiran, and Yanfeng Shen. "Selective Lamb Mode Transmission Enabled by Local Resonance Based Ultrasonic Metamaterial." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10872.

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Abstract In this study, a kind of elastic metamaterial substructure was designed for the selective mode filtering and transmission of symmetric and antisymmetric elastic waves. It is composed of double-sided aluminum-lead composite cylinders arranged in a periodic pattern bounded on an aluminum plate. The band structure of elastic metamaterial unit cell is numerically investigated using the modal analysis of a finite element model (FEM) by treating a unit microstructural cell with the Bloch-Floquet boundary condition. Through analyzing the vibration modes of the unit cell, a complete antisymme
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Tian, Zhenhua, and Lingyu Yu. "Lamb Wave Propagation Study Using Frequency-Wavenumber Analysis." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8013.

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Lamb waves are dispersive and multi-modal. Various wave modes make the interpretation of Lamb wave signal very difficult. It is desired that different modes can be separated for individual analysis. In the this paper, we present our studies on the multimodal Lamb wave propagation and wave mode extraction using frequency-wavenumber analysis. Wave spectrum in the frequency-wavenumber domain shows clear distinction among Lamb wave modes being present. This allows separating them or extracting a desired Lamb wave mode through a novel filtering strategy. Thus a single mode Lamb can be identified an
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Ginsberg, J. H. "Modified Geometrical Acoustics Phenomena Exhibited by Computations for Hemi-Capped Cylinders in the Mid-Frequency Range." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4134.

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Abstract The relation between surface pressure and normal velocity on a slender capped cylinder is examined. The data for this study are obtained from the wavenumber-based version of the surface variational principle (SVP), whose representation of the acoustic field is shown to consist of a discretely infinite sum of waves propagating in the circumferential and meridian directions. The circumferential wavenumbers are uncoupled, whereas coupling of the meridional spectra is described by the wet-surface impedance, whose value is obtained within an SVP analysis. Typical mid-frequency range result
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Cheney, Drew A., and Jennifer R. Lukes. "Excitation of Single Phonon Modes in Nanoscale Waveguides." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44111.

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We present a new computational method that excites guided phonon modes in nanoscale waveguides at a specific frequency and wavenumber. The method uses nonequilibrium molecular dynamics and Fourier analysis of particle displacements to extract mode shapes from single frequency excitations consisting of superposed spatial modes. These mode shapes are used to excite the waveguide inlet boundary so that single phonon modes are generated in the structure. Mode shapes and phonon spectra for a silicon planar waveguide with rigid wall boundaries are calculated to demonstrate the viability of the techn
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Hackett, Erin E., Anne M. Fullerton, Craig F. Merrill, and Thomas C. Fu. "Measurements of Surface Waves Using Low-Grazing Angle High-Resolution Pulse-Doppler Radar." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49900.

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Techniques for extracting surface wave characteristics from radar backscatter have been investigated and improved over the last several decades. Much of this research has focused on the use of backscatter intensity from navigational radars for characterization of wave period and direction, and has clearly demonstrated accurate measurement of these wave characteristics. However, the precise determination of significant wave height has been more problematic due to the required application of a modulation transfer function. Furthermore, low sea states generally do not provide enough backscatter i
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