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Articoli di riviste sul tema "Surface acoustics waves"

Autore: Grafiati

Pubblicato: 19 aprile 2025

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1

Krylov, Victor V. "On the Applicability of Kramers–Kronig Dispersion Relations to Guided and Surface Waves". Acoustics 6, n. 3 (29 giugno 2024): 610–19. http://dx.doi.org/10.3390/acoustics6030033.

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In unbounded media, the acoustic attenuation as function of frequency is related to the frequency-dependent sound velocity (dispersion) via Kramers–Kronig dispersion relations. These relations are fundamentally important for better understanding of the nature of attenuation and dispersion and as a tool in physical acoustics measurements, where they can be used for control purposes. However, physical acoustic measurements are frequently carried out not in unbounded media but in acoustic waveguides, e.g., inside liquid-filled pipes. Surface acoustic waves are also often used for physical acoustics measurements. In the present work, the applicability of Kramers–Kronig relations to guided and surface waves is investigated using the approach based on the theory of functions of complex variables. It is demonstrated that Kramers–Kronig relations have limited applicability to guided and surface waves. In particular, they are not applicable to waves propagating in waveguides characterised by the possibility of wave energy leakage from the waveguides into the surrounding medium. For waveguides without leakages, e.g., those formed by rigid walls, Kramers–Kronig relations remain valid for both ideal and viscous liquids. Examples of numerical calculations of wave dispersion and attenuation using Kramers–Kronig relations, where applicable, are presented for unbounded media and for waveguides formed by two rigid walls.

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2

Aliev, I. N. "Geometrical acoustics approximation for surface waves". Journal of Applied Mechanics and Technical Physics 33, n. 3 (1992): 375–79. http://dx.doi.org/10.1007/bf00851733.

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3

Daigle, G. A., e T. F. W. Embleton. "Surface waves and surface wave devices in atmospheric acoustics". Journal of the Acoustical Society of America 88, S1 (novembre 1990): S190. http://dx.doi.org/10.1121/1.2028857.

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4

Daigle, G. A. "Surface waves above porous ground surfaces". Journal of the Acoustical Society of America 85, S1 (maggio 1989): S82. http://dx.doi.org/10.1121/1.2027167.

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5

Nie, Ruixin, Bin Wang e Tengjiao He. "Extraction and analysis of three-dimensional sound scattering characteristics by body-generated internal waves". Journal of the Acoustical Society of America 154, n. 4_supplement (1 ottobre 2023): A41—A42. http://dx.doi.org/10.1121/10.0022737.

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The motion of an object submerged in a stratified fluid generates surface wakes, and simultaneously induces internal waves at the interface where there is a change in sound speed, known as the thermocline. As a result, spectral-temporal fluctuations occur in both the surface height and the distribution of sound velocity. While surface wakes primarily contribute to geometric acoustic scattering, the internal waves generated by the underwater object's motion can have diverse effects on sound propagation, leading to a prolonged acoustic impact that may have practical applications in underwater acoustic detection. This paper investigates the impact of body-generated internal waves on underwater acoustic propagation through the establishment of an “unfrozen field,” range-dependent model using the approximated Kelvin wake theory. The model allows numerical simulations to demonstrate the spatial-temporal coherence, time-frequency modulation and directional characteristics of the three-dimensional sound field scattered by the body-generated internal wave. By analyzing the influences of thermocline depth, target motion velocity and source depth, the results presented in this study indicate that the long-range acoustic propagation, modulated by the body-generated internal waves, can provide additional information for detecting moving targets.

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6

Cormack, John M., Yurii A. Ilinskii, Evgenia A. Zabolotskaya e Mark F. Hamilton. "Nonlinear piezoelectric surface acoustic waves". Journal of the Acoustical Society of America 151, n. 3 (marzo 2022): 1829–46. http://dx.doi.org/10.1121/10.0009770.

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The theory for nonlinear surface acoustic waves in crystals developed using Hamiltonian mechanics [Hamilton, Il'inskii, and Zabolotskaya, J. Acoust. Soc. Am. 105, 639 (1999)] is modified to account for piezoelectric material properties. The derived spectral evolution equations permit analysis of nonlinear surface wave propagation along a cut surface of any orientation with respect to the crystallographic axes and for piezoelectric crystals with any symmetry. Numerical simulations of waveform distortion in the particle velocity and electric field components are presented for surface wave propagation in Y-cut lithium niobate along the X- and Z-crystallographic axes. The influence of piezoelectricity is illustrated by comparing the nonlinear evolution of waveforms along a surface bounded by a vacuum (free space) and an ideal conductor (short circuit). Contributions to the nonlinearity from elasticity, piezoelectricity, electrostriction, and dielectricity are quantified separately for the two boundary conditions.

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7

Richards, Edward L. "Acoustic tracking of surface waves". Journal of the Acoustical Society of America 149, n. 4 (aprile 2021): A132. http://dx.doi.org/10.1121/10.0004764.

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8

Du, Liangfen, e Zheng Fan. "Anomalous refraction of acoustic waves using double layered acoustic grating". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, n. 6 (30 novembre 2023): 2396–403. http://dx.doi.org/10.3397/in_2023_0353.

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The paper proposes a double layered acoustic grating for fulfilling acoustic focusing in an anomalous direction. The acoustic grating consists of two layers of rigid panels with periodically perforated slits. By optimizing the positions of the slits on the two layers, both positive and negative refractive indices can be achieved with the phase shift tailored within [-π/2, π/2]. This allows acoustic energy of an obliquely incident plane wave to converge in a predefined focusing region in any direction. The paper predicts the wave propagation manipulated by the acoustic grating based on the surface coupling approach. Then, it discusses how to optimize the slits' positions to collimate the acoustic energy of an obliquely incident plane wave in a specific direction. Such acoustic grating has various potential applications, such as deflecting outdoor noise away from sensitive areas in building acoustics, enhancing acoustic energy in a target audience area in auditorium design, collimating acoustic surface waves, etc.

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9

Baev, A. R., A. L. Mayorov, M. V. Asadchaya, V. N. Levkovich e K. G. Zhavoronkov. "Features of the Surface and Subsurface Waves Application for Ultrasonic Evaluation of Physicomechanical Properties of Solids. Part 1. Influence of the Geometrical Parameters". Devices and Methods of Measurements 9, n. 4 (17 dicembre 2018): 325–26. http://dx.doi.org/10.21122/2220-9506-2018-9-4-325-326.

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Application of surface and subsurface waves for control of objects with a double-layer structure allows to extend possibilities of diagnostics of their physico-mechanical properties. The purpose of work was to determine conditions and offer recommendations providing measuring of ultrasonic velocity and amplitude of the former modes in protective layers and in basis of object at one-sided access to its surface.The analysis of an acoustic path of a measuring system in relation to ultrasonic evaluation of the objects having the restricted sizes and the protective coating according to velocity data of the surface and subsurface waves propagation is made. On the basis of representations of beam acoustics the dependences connecting a wavelength of the excited surface and subsurface modes, thickness and width of a controlled object, acoustic base of a sounding are defined. There are to provide a condition leveling of the influence of an acoustical noise created by the reflected and accompanying waves on parameters of acoustic signal with the given quantity of oscillations in an impulse.The principle opportunity is shown and conditions for determination of velocity of subsurface body waves in the base material which is under a protective coating layer are established. For these purposes on the basis of use of the block of ultrasonic probes the optimum scheme of a sounding is offered and the analytical expression for calculation of required velocity considering varying of thickness of a covering is received.The method of acoustical measuring realized by a direct and reverse sounding of the objects with small aperture and angle probes was analysed and formulas for determination of speed of subsurface wave under protective layer of the wedge form have been got. An ultrasonic device is suggested for the excitationreception of subsurface waves with different speed in objects (on 20–35 %) using for the acoustic concordance of environments of metallic sound duct as a wedge. Possibility of leveling of interference in a protective layer to control efects in basis of material by a volume wave by creation of supporting echo-signal of longitudinal wave of the set frequency and entered normally to the surface of object was studied.

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10

LINTON, C. M., e M. McIVER. "The existence of Rayleigh–Bloch surface waves". Journal of Fluid Mechanics 470 (31 ottobre 2002): 85–90. http://dx.doi.org/10.1017/s0022112002002227.

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Rayleigh–Bloch surface waves arise in many physical contexts including water waves and acoustics. They represent disturbances travelling along an infinite periodic structure. In the absence of any existence results, a number of authors have previously computed such modes for certain specific geometries. Here we prove that such waves can exist in the absence of any incident wave forcing for a wide class of structures.

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11

Yves, Simon, Yu-Gui Peng e Andrea Alù. "Topological Lifshitz transition in twisted hyperbolic acoustic metasurfaces". Applied Physics Letters 121, n. 12 (19 settembre 2022): 122201. http://dx.doi.org/10.1063/5.0107465.

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Acoustic metamaterials and metasurfaces have been explored in the past few years to realize a wide range of extreme responses for sound waves. As one remarkable phenomenon, extreme anisotropy and hyperbolic sound propagation are particularly challenging to realize compared to electromagnetic waves because of the scalar nature of airborne acoustics. In parallel, moiré superlattices and the rapidly expanding domain of twistronics have shown that large anisotropy combined with tailored geometrical rotations can enable tantalizing emerging phenomena, such as tailored phase transitions in metamaterials. Connecting these areas of research, here, we explore the realization of acoustic hyperbolic metasurfaces and their combination to drive topological phase transitions from hyperbolic to elliptic sound propagation. The transition point occurring at a specific rotation angle between two acoustic metasurfaces supports highly directional canalization of sound, opening exciting opportunities for twisted acoustics metasurfaces for robust surface wave guiding and steering.

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12

González, Genaro, Albert Samper e Blas Herrera. "ACOUSTIC SIMULATION OF THE CENTRAL HALL IN PALAU GÜELL BY GAUDÍ". Architecture and Engineering 6, n. 2 (2021): 18–30. http://dx.doi.org/10.23968/2500-0055-2021-6-2-18-30.

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Introduction: Quadric surfaces are commonly used in buildings due to their geometric ability to distribute and focus sound waves. The Central Hall in Palau Güell — a UNESCO World Heritage Site — is topped by an ellipsoidal dome. Antoni Gaudí envisaged this room as a concert hall where the organ and the dome play a lead role. Methods: The two previously mentioned elements are the main subject of our paper, which serves two purposes: 1) determining the values of the acoustic parameters of the hall through onsite measurement and also through simulation, and 2) using the geometric parameters of the quadric surface, which best fits the dome, in order to check whether it is possible to improve the acoustics of the hall by placing a new emission source at the focus of the dome’s ellipsoid. Results and Discussion: Contrary to the authors’ expectations, due to the focal reflection properties of the quadric surface, some acoustic parameters on the listening plane do not improve significantly. Therefore, we conclude that Gaudí took the acoustical impact into account when designing this hall.

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13

Sonner, Maximilian M., Farhad Khosravi, Lisa Janker, Daniel Rudolph, Gregor Koblmüller, Zubin Jacob e Hubert J. Krenner. "Ultrafast electron cycloids driven by the transverse spin of a surface acoustic wave". Science Advances 7, n. 31 (luglio 2021): eabf7414. http://dx.doi.org/10.1126/sciadv.abf7414.

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Spin-momentum locking is a universal wave phenomenon promising for applications in electronics and photonics. In acoustics, Lord Rayleigh showed that surface acoustic waves exhibit a characteristic elliptical particle motion strikingly similar to spin-momentum locking. Although these waves have become one of the few phononic technologies of industrial relevance, the observation of their transverse spin remained an open challenge. Here, we observe the full spin dynamics by detecting ultrafast electron cycloids driven by the gyrating electric field produced by a surface acoustic wave propagating on a slab of lithium niobate. A tubular quantum well wrapped around a nanowire serves as an ultrafast sensor tracking the full cyclic motion of electrons. Our acousto-optoelectrical approach opens previously unknown directions in the merged fields of nanoacoustics, nanophotonics, and nanoelectronics for future exploration.

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14

Bowman, Daniel, Amrit K. Bal e Fransiska Dannemann Dugick. "Controls on the acoustic expression of buried and surface chemical explosions". Journal of the Acoustical Society of America 155, n. 3_Supplement (1 marzo 2024): A144. http://dx.doi.org/10.1121/10.0027102.

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Surface and buried chemical explosions in the 1-50 ton TNT equivalent range can generate acoustic waves capable of traveling thousands of kilometers. Planned explosive campaigns in this size range have been used to develop acoustics-based yield determination techniques, investigate how acoustic propagation paths vary over short time scales, and examine how ground motion induces sound above the epicenter, among others. Here, we describe several test campaigns involving buried and surface chemical explosions. We discuss the combinations of explosive yield and burial depth that produce laterally propagating infrasound waves, as well as instances where diffuse sound from violent topographic shaking is observed. We also give an overview of a test series specifically aimed at investigating acoustic signal variation at tens to hundreds of kilometers range using co-located surface explosions fired tens of seconds apart. This will provide context for acoustic data interpretation from existing test series and aid in the design of future ones. [SNL is managed and operated by NTESS under DOE NNSA Contract No. DE-NA0003525.]

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15

Brace, John G., e Thomas S. Sanfelippo. "Flow sensing using surface acoustic waves". Journal of the Acoustical Society of America 91, n. 4 (aprile 1992): 2300. http://dx.doi.org/10.1121/1.403646.

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16

Dickey, Joe. "Recent Development in Surface Acoustic Waves". Journal of the Acoustical Society of America 89, n. 1 (gennaio 1991): 484. http://dx.doi.org/10.1121/1.400463.

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17

Ma, Yiping, W. K. Van Moorhem e R. W. Shorthill. "Acoustic waves over a transpiring surface". Journal of the Acoustical Society of America 85, S1 (maggio 1989): S74. http://dx.doi.org/10.1121/1.2027130.

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18

Maradudin, Alexei A. "Surface acoustic waves on nonlinear substrates". Journal of the Acoustical Society of America 86, S1 (novembre 1989): S74. http://dx.doi.org/10.1121/1.2027634.

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19

BASKAR, SAMBANDAM, FRANÇOIS COULOUVRAT e RÉEGIS MARCHIANO. "Nonlinear reflection of grazing acoustic shock waves: unsteady transition from von Neumann to Mach to Snell–Descartes reflections". Journal of Fluid Mechanics 575 (marzo 2007): 27–55. http://dx.doi.org/10.1017/s0022112006003752.

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We study the reflection of acoustic shock waves grazing at a small angle over a rigid surface. Depending on the incidence angle and the Mach number, the reflection patterns are mainly categorized into two types, namely regular reflection and irregular reflection. In the present work, using the nonlinear KZ equation, this reflection problem is investigated for extremely weak shocks as encountered in acoustics. A critical parameter, defined as the ratio of the sine of the incidence angle and the square root of the acoustic Mach number, is introduced in a natural way. For step shocks, we recover the self-similar (pseudo-steady) nature of the reflection, which is well known from von Neumann's work. Four types of reflection as a function of the critical parameter can be categorized. Thus, we describe the continuous but nonlinear and non-monotonic transition from linear reflection (according to the Snell–Descartes laws) to the weak von-Neumann-type reflection observed for almost perfectly grazing incidence. This last regime is a new, one-shock regime, in contrast with the other, already known, two-shock (regular reflection) or three-shock (von Neumann-type reflection) regimes. Hence, the transition also resolves another paradox on acoustic shock waves addressed by von Neumann in his classical paper. However, step shocks are quite unrealistic in acoustics. Therefore, we investigate the generalization of this transition for N-waves or periodic sawtooth waves, which are more appropriate for acoustics. Our results show an unsteady reflection effect necessarily associated with the energy decay of the incident wave. This effect is the counterpart of step-shock propagation over a concave surface. For a given value of the critical parameter, all the patterns categorized for the step shock may successively appear when the shock is propagating along the surface, starting from weak von-Neumann-type reflection, then gradually turning to von Neumann reflection and finally evolving into nonlinear regular reflection. This last one will asymptotically result in linear regular reflection (Snell–Descartes). The transition back to regular reflection is one of two types, depending on whether a secondary reflected shock is observed. The latter case, here described for the first time, appears to be related to the non-constant state behind the incident shock, which prevents secondary reflection.

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20

Chambers, Derrick, Peiyao Li, Harpreet Sethi e Jeffery Shragge. "Monitoring industrial acoustics with distributed acoustic sensing". Journal of the Acoustical Society of America 151, n. 4 (aprile 2022): A58. http://dx.doi.org/10.1121/10.0010648.

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True-phase distributed acoustic sensing (DAS), a technique which uses low-power laser pulses to monitor along-fiber strain in optical cable, has proven useful in many geophysical research areas, including down-hole monitoring in oil/gas extraction, near-surface characterization, detecting and locating regional and global earthquakes, urban monitoring. Most of the geophysical applications to date, however, have focused on recording elastic waves propagating through solid media. In this work, we explore the response of DAS for recording acoustic propagation in air, as a function of fiber type and configuration, over frequency bands useful for monitoring industrial environments. We also present methods of creating simple fiber-composite sensing units for improving sensitivity, and strategies for combining solid-earth and acoustic monitoring to create an effective seismoacoustic array with a single DAS interrogator.

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21

MCDANIEL, SUZANNE T. "UNDERWATER ACOUSTIC SENSING OF SEA SURFACE WAVES". Journal of Computational Acoustics 16, n. 01 (marzo 2008): 55–70. http://dx.doi.org/10.1142/s0218396x08003452.

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Rough surface scattering theory is applied to the problem of estimating gravity-capillary wavenumber spectra from measurements of sea surface backscatter at high acoustic frequencies. Ensemble averaged scattering cross sections predicted by small-slope expansions are evaluated to examine the inversion of acoustic data assuming Bragg scatter. The ratio of the full fourth-order small-slope and Bragg predictions is found to exhibit a minimum value of ~ 2dB at moderate angles of incidence. At such angles, the corrections to perturbation theory depend weakly on acoustic frequency and environmental conditions. This latter finding indicates that only a modest effort is required to monitor sea surface conditions to estimate the correction. Corrections to Bragg predictions increase rapidly with increasing incidence angle and at high angles, the fourth-order contributions of the small-slope and extended small-slope expansions differ. This finding casts some doubt on the applicability of small-slope approximations to predict scattering at high-incidence angles.

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22

Malischewsky, Peter, e M. A. Breazeale. "Surface Waves and Discontinuities". Journal of the Acoustical Society of America 88, n. 1 (luglio 1990): 588. http://dx.doi.org/10.1121/1.399904.

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Attenborough, Keith, Imran Bashir e Shahram Taherzadeh. "Surface waves over rigid-porous and rough surfaces". Journal of the Acoustical Society of America 133, n. 5 (maggio 2013): 3351. http://dx.doi.org/10.1121/1.4805688.

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24

Zhang, Likun, e Zheguang Zou. "Modeling of airborne ultrasound reflection from water surface waves". Journal of the Acoustical Society of America 152, n. 4 (ottobre 2022): A232. http://dx.doi.org/10.1121/10.0016114.

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Airborne ultrasound reflection from water surface waves is modelled to advance uses of acoustic signals to measure water surface waves and apply the measurements to explore interactions of water waves with rigid structures in a laboratory setting. When the ultrasound is incident on a moving periodic water surface wave, the reflected signal can be treated as diffraction from a moving corrugated reflection grating. Under the condition that the amplitude of the water surface waves is much less than the incident acoustic wavelength, diffraction theory leads to analytical formulas for the spectra of the acoustic signal relating to the water wave amplitudes and frequencies. Complementary modeling based on ray theory and wave superposition illustrates the diffraction and validates formulas of water wave reflection from a surface-piercing barrier structure, where two counter-propagating water waves are involved.

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25

Farmer, David M., e Li Ding. "Acoustical tracking of breaking surface waves". Journal of the Acoustical Society of America 88, S1 (novembre 1990): S2. http://dx.doi.org/10.1121/1.2028948.

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Hudson, J. A. "Recent developments in surface acoustic waves". Journal of Sound and Vibration 139, n. 3 (giugno 1990): 537. http://dx.doi.org/10.1016/0022-460x(90)90685-s.

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27

Masserey, B., L. Aebi e E. Mazza. "Ultrasonic surface crack characterization on complex geometries using surface waves". Ultrasonics 44 (dicembre 2006): e957-e961. http://dx.doi.org/10.1016/j.ultras.2006.05.059.

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Delsing, Per, Andrew N. Cleland, Martin J. A. Schuetz, Johannes Knörzer, Géza Giedke, J. Ignacio Cirac, Kartik Srinivasan et al. "The 2019 surface acoustic waves roadmap". Journal of Physics D: Applied Physics 52, n. 35 (3 luglio 2019): 353001. http://dx.doi.org/10.1088/1361-6463/ab1b04.

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Maurel, Agnès, Vincent Pagneux, Felipe Barra e Fernando Lund. "Surface acoustic waves in interaction with a dislocation". Ultrasonics 50, n. 2 (febbraio 2010): 161–66. http://dx.doi.org/10.1016/j.ultras.2009.09.020.

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Cherednick, V. I. "Diffraction Distortion of Surface Acoustic Waves in Crystals". Acoustical Physics 51, n. 4 (2005): 469. http://dx.doi.org/10.1134/1.1983611.

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Oudich, Mourad, e Yun Jing. "Elastic topological pumping for surface acoustic waves". Journal of the Acoustical Society of America 150, n. 4 (ottobre 2021): A109. http://dx.doi.org/10.1121/10.0007792.

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Robinson, Harold C. "Types and properties of surface acoustic waves." Journal of the Acoustical Society of America 99, n. 4 (aprile 1996): 2479–500. http://dx.doi.org/10.1121/1.415567.

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Kats, Vyacheslav D., e Arnold S. Gordon. "Electronic weighing apparatus utilizing surface acoustic waves". Journal of the Acoustical Society of America 113, n. 4 (2003): 1782. http://dx.doi.org/10.1121/1.1572316.

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Yang, Yang, Corinne Dejous e Hamida Hallil. "Trends and Applications of Surface and Bulk Acoustic Wave Devices: A Review". Micromachines 14, n. 1 (24 dicembre 2022): 43. http://dx.doi.org/10.3390/mi14010043.

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The past few decades have witnessed the ultra-fast development of wireless telecommunication systems, such as mobile communication, global positioning, and data transmission systems. In these applications, radio frequency (RF) acoustic devices, such as bulk acoustic waves (BAW) and surface acoustic waves (SAW) devices, play an important role. As the integration technology of BAW and SAW devices is becoming more mature day by day, their application in the physical and biochemical sensing and actuating fields has also gradually expanded. This has led to a profusion of associated literature, and this article particularly aims to help young professionals and students obtain a comprehensive overview of such acoustic technologies. In this perspective, we report and discuss the key basic principles of SAW and BAW devices and their typical geometries and electrical characterization methodology. Regarding BAW devices, we give particular attention to film bulk acoustic resonators (FBARs), due to their advantages in terms of high frequency operation and integrability. Examples illustrating their application as RF filters, physical sensors and actuators, and biochemical sensors are presented. We then discuss recent promising studies that pave the way for the exploitation of these elastic wave devices for new applications that fit into current challenges, especially in quantum acoustics (single-electron probe/control and coherent coupling between magnons and phonons) or in other fields.

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Szemela, Krzysztof, Wojciech P. Rdzanek e Witold J. Rdzanek. "Acoustic Power Radiated by a System of Two Vibrating Circular Membranes Located at the Boundary of Three-Wall Corner Spatial Region". Archives of Acoustics 37, n. 4 (1 dicembre 2012): 463–73. http://dx.doi.org/10.2478/v10168-012-0058-8.

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Abstract Two vibrating circular membranes radiate acoustic waves into the region bounded by three infinite baffles arranged perpendicularly to one another. The Neumann boundary value problem has been investigated in the case when both sources are embedded in the same baffle. The analyzed processes are time harmonic. The membranes vibrate asymmetrically. External excitations of different surface distributions and different phases have been applied to the sound sources’ surfaces. The influence of the radiated acoustic waves on the membranes’ vibrations has been included. The acoustic power of the sound sources system has been calculated by using a complete eigenfunctions system.

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Gokani, Chirag A., Thomas S. Jerome, Michael R. Haberman e Mark F. Hamilton. "Born approximation of acoustic radiation force used for acoustofluidic separation". Journal of the Acoustical Society of America 151, n. 4 (aprile 2022): A90. http://dx.doi.org/10.1121/10.0010753.

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Acoustofluidic separation often involves biological targets with specific acoustic impedance similar to that of the host fluid, and with dimensions on the order of the acoustic wavelength. This parameter range, combined with the use of standing waves to separate the targets, lends itself to use of the Born approximation for calculating the acoustic radiation force. Considered here is the configuration analyzed by Peng et al. [J. Mech. Phys. Solids 145, 104134 (2020)], in which two intersecting plane waves radiated into the fluid by a standing surface acoustic wave exert a force on a eukaryotic cell modeled as a multilayered sphere. The angle of intersection is determined by the velocity of the surface wave and the sound speed in the fluid. The acoustic field in this case is a standing wave parallel to the substrate and a traveling wave perpendicular to the substrate. For all parameter values considered by Peng et al., including spheres several wavelengths in diameter, the Born approximation of the acoustic radiation force parallel to the substrate is in good agreement with a full theory based on spherical wave expansions of the incident and scattered fields. [C.A.G. and T.S.J. were supported by ARL:UT McKinney Fellowships in Acoustics.]

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Zabolotskaya, Evgenia A., Yurii A. Ilinskii e Mark F. Hamilton. "Nonlinear surface waves in soil". Journal of the Acoustical Society of America 120, n. 5 (novembre 2006): 3281. http://dx.doi.org/10.1121/1.4777399.

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Jones, H. W., H. W. Kwan e E. Yeatman. "Surface waves in viscoelastic fluid". Journal of the Acoustical Society of America 82, S1 (novembre 1987): S101. http://dx.doi.org/10.1121/1.2024527.

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39

Maruszewski, Bogdan. "Thermodiffusive surface waves in semiconductors". Journal of the Acoustical Society of America 85, n. 5 (maggio 1989): 1967–77. http://dx.doi.org/10.1121/1.397850.

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40

Tindle, Chris T., Grant Deane e James Preisig. "Multipath reflection from surface waves". Journal of the Acoustical Society of America 123, n. 5 (maggio 2008): 3086. http://dx.doi.org/10.1121/1.2932910.

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41

Raghukumar, Kaustubha, Lindsay Hogan, Christopher Zappa, Frank Spada e Grace Chang. "Optical detection of ensonified capillary-gravity waves using polarimetric imaging". Journal of the Acoustical Society of America 153, n. 3_supplement (1 marzo 2023): A64. http://dx.doi.org/10.1121/10.0018177.

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Abstract (sommario):

The optical detection of surface capillary-gravity waves induced by underwater sound has many potential applications that range from the detection of sound-generating underwater objects to airborne bathymetric surveys. While multiple lab-based efforts have measured acoustically generated surface capillary-gravity waves, we report on a recent field-based measurement using polarimetric imaging. A controlled acoustic source was placed 10 m below a lake surface and emitted sound in the 500 Hz to 10000Hz frequency range. The lake surface was imaged using a polarimetric camera mounted 7 m above the lake surface. Measurable short-lived surface capillary-gravity waves (∼3 mm wavelength) were observed in the polarimetric camera images during ensonification of the lake surface. Changes were observed in both the omnidirectional and directional wave spectra. In the omni-directional wavenumber spectrum, enhanced capillary wave activity at high wavenumbers was observed for acoustic source frequencies in the 2–5 kHz range. Additionally, ensonification was observed to result in the amplitude and wavenumber modulation (enhancement/diminution) of existing wind-generated surface gravity-capillary waves. In the directional spectra, while ambient gravity-capillary waves showed a spreading function with stronger downwind versus upwind propagation, the acoustically generated gravity-capillary waves showed minimal impact on the directionality of the wave spectra.

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42

Timmermann, Johannes, Norbert Hövelmann e Delf Sachau. "Active Control of the Reflection Coefficient of an Underwater Surface". Acoustics 5, n. 4 (8 dicembre 2023): 1148–60. http://dx.doi.org/10.3390/acoustics5040065.

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Abstract (sommario):

From a strategic point of view, it is essential to protect underwater vehicles from being detected by opponents. Modern mono- or bistatic sonar systems are capable of precisely determining the position of a watercraft. In order to triangulate the positions of watercrafts, the sonar sends out acoustic signals that are reflected by the vehicles’ surfaces. These deflected sound waves are subsequently detected and evaluated. How well an object can be detected using a sonar can be measured according to the target strength. Through their shape, construction and choice of materials, modern underwater vehicles are optimized in relation to minimizing their radiated and reflected sound waves; in this way, their target strength is minimized. These passive measures are particularly effective in the medium- and high-frequency range down to 1500 Hz. To effectively reduce reflections at lower frequencies, an active system is developed in this study and evaluated in a laboratory test with a water-filled impedance tube. The incident sound waves were measured in front of an active surface and then processed using an adaptive control system based on an FPGA platform. The system operates with a very thin piezoceramic applied to the surface in order to minimize the reflections of the sound waves. The laboratory tests showed the high effectiveness of the system under the influence of sonar-like signals.

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43

Lauriks, Walter, Luc Kelders e Jean F. Allard. "Surface waves above gratings having a triangular profile". Ultrasonics 36, n. 8 (luglio 1998): 865–71. http://dx.doi.org/10.1016/s0041-624x(98)00009-2.

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44

Zhang, Lihong. "Method of acoustic separation on the surface of cylindrical baffle". Journal of the Acoustical Society of America 154, n. 4_supplement (1 ottobre 2023): A356. http://dx.doi.org/10.1121/10.0023786.

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Abstract (sommario):

This paper suggests a statistically optimal near-field acoustic holography method based on the combination of plane waves and cylindrical waves, which is used for underwater cylindrical baffles. The method addresses the issue that the extraction of scattered acoustic waves from the surface of underwater cylindrical baffles requires too many measurement points in practical applications: separation of incident and dispersed sound fields and near-field measurements of sound fields at baffle surfaces.The underwater detection sound source is situated in the scatterer's far-field region, so in the actual application scenario for the surface acoustic scattering separation of the cylindrical baffle, the plane wave expansion is used to represent the surface incident acoustic wave and the cylindrical wave expansion is used to describe the scattered acoustic wave on the baffle surface. As a result, fewer expansion orders are required to describe the entire sound field on the baffle's surface. It is verified by simulation that the method is valid and efficient for near-field total sound field measurement and dispersed sound field separation of roughly cylindrical targets under underwater far-field incidence situations because the measurement holographic surface of the surface permits unlimited geometries.

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45

Zapevalov, A. S., e A. N. Bol’shakov. "Scattering of decimetric acoustic waves from the sea’s surface". Acoustical Physics 55, n. 3 (maggio 2009): 393–98. http://dx.doi.org/10.1134/s1063771009030154.

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46

Deschamps, M., O. Poncelet, S. Dilhaire e W. Claeys. "Surface acoustic waves at the vacuum-thermoviscoelastic solid interface". Ultrasonics 37, n. 10 (luglio 2000): 677–80. http://dx.doi.org/10.1016/s0041-624x(00)00017-2.

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47

Johnson, Michael-David, Anton Krynkin, Giulio Dolcetti, Mansour Alkmim, Jacques Cuenca e Laurent De Ryck. "Surface shape reconstruction from phaseless scattered acoustic data using a random forest algorithm". Journal of the Acoustical Society of America 152, n. 2 (agosto 2022): 1045–57. http://dx.doi.org/10.1121/10.0013506.

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Abstract (sommario):

Recent studies have demonstrated that acoustic waves can be used to reconstruct the roughness profile of a rigid scattering surface. In particular, the use of multiple microphones placed above a rough surface as well as an analytical model based on the linearised Kirchhoff integral equations provides a sufficient base for the inversion algorithm to estimate surface geometrical properties. Prone to fail in the presence of high noise and measurement uncertainties, the analytical approach may not always be suitable in analysing measured scattered acoustic pressure. With the aim to improve the robustness of the surface reconstruction algorithms, here it is proposed to use a data-driven approach through the application of a random forest regression algorithm to reconstruct specific parameters of one-dimensional sinusoidal surfaces from airborne acoustic phase-removed pressure data. The data for the training set are synthetically generated through the application of the Kirchhoff integral in predicting scattered sound, and they are further verified with data produced from laboratory measurements. The surface parameters from the measurement sample were found to be recovered accurately for various receiver combinations and with a wide range of noise levels ranging from 0.1% to 30% of the average scattered acoustical pressure amplitude.

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48

Lirette, Robert L., Zheguang Zou, Guoqin Liu, Xinyue Gong e Likun Zhang. "Acoustic measurements of capillary-gravity water surface waves". Journal of the Acoustical Society of America 148, n. 4 (ottobre 2020): 2571. http://dx.doi.org/10.1121/1.5147134.

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49

Profunser, Dieter M., Oliver B. Wright, Osamu Matsuda, Yukihiro Tanaka, Abdelkrim Khelif, Vincent Laude e Sarah Benchabane. "Surface acoustic waves propagating on microstructured phononic crystals". Journal of the Acoustical Society of America 123, n. 5 (maggio 2008): 3551. http://dx.doi.org/10.1121/1.2934566.

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50

Saenger, Ryan, Luc Lenain, William Kuperman e William Hodgkiss. "Mid-frequency acoustic localization of breaking waves". Journal of the Acoustical Society of America 153, n. 3_supplement (1 marzo 2023): A135. http://dx.doi.org/10.1121/10.0018414.

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Abstract (sommario):

During an experiment in deep water off the coast of Southern California, winds between 20 and 25 knots resulted in large breaking waves. A mid-frequency planar hydrophone array recorded underwater ambient noise while an airplane equipped with a high-resolution video camera recorded images of the sea surface above the array. Beams of ambient noise between 5 and 6kHz were projected onto the sea surface and aligned in space and time with the aerial images. The array’s resolution of the surface is coarse (20 by 50 m) due to its modest 1 meter horizontal aperture and relatively deep 130meter deployment depth. Nonetheless, concentrated regions of high intensity in the acoustic surface projection match visible breaking events in the aerial images. [Work supported by the Office of Naval Research.]

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