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Journal articles on the topic 'Speed of sound wave propagation'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Hawwa, Muhammad A. "Sound Propagation in a Duct with Wall Corrugations Having Square-Wave Profiles." Mathematical Problems in Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/516982.

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Acoustic wave propagation in ducts with rigid walls having square-wave wall corrugations is considered in the context of a perturbation formulation. Using the ratio of wall corrugation amplitude to the mean duct half width, a small parameter is defined and a two levels of approximations are obtained. The first-order solution produces an analytical description of the pressure field inside the duct. The second-order solution yields an analytical estimate of the phase speed of waves transmitting through the duct. The effect of wall corrugation density on acoustic impedance and wave speeds is high

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2

Harutyunyan, V. G., A. R. Aramyan, G. R. Aramyan, et al. "Study of the Development of Sound Waves Generated by Shock Waves." Journal of Physics: Conference Series 2657, no. 1 (2023): 012008. http://dx.doi.org/10.1088/1742-6596/2657/1/012008.

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Abstract The work is devoted to studies of the time development of sound waves generated by shock waves. It is shown that the shock wave, propagating, generates an acoustic wave whose frequency changes over time. That change is related to the change in the speed of propagation of the shock wave.

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Le, Thi Thanh Giang, Kyeong Sik Jang, Kwan-Sup Lee, and Jaiyoung Ryu. "Numerical Investigation of Aerodynamic Drag and Pressure Waves in Hyperloop Systems." Mathematics 8, no. 11 (2020): 1973. http://dx.doi.org/10.3390/math8111973.

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Hyperloop is a new, alternative, very high-speed mode of transport wherein Hyperloop pods (or capsules) transport cargo and passengers at very high speeds in a near-vacuum tube. Such high-speed operations, however, cause a large aerodynamic drag. This study investigates the effects of pod speed, blockage ratio (BR), tube pressure, and pod length on the drag and drag coefficient of a Hyperloop. To study the compressibility of air when the pod is operating in a tube, the effect of pressure waves in terms of propagation speed and magnitude are investigated based on normal shockwave theories. To r

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Harutyunyan, G. A., A. A. Muradyan, A. R. Aramyan, et al. "Analysis of shock wave propagation in the atmosphere through generated sound waves." Journal of Instrumentation 19, no. 06 (2024): C06012. http://dx.doi.org/10.1088/1748-0221/19/06/c06012.

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Abstract The paper presents the results of studies of shock waves propagating in the atmosphere. These results were obtained by recording sound waves generated by a shock wave. It has been shown that it takes approximately two seconds for a shock wave to form. The frequency of the sound wave generated by the shock wave depends on the speed of propagation of the shock wave. It was found that the shock wave accelerates as it propagates upward. This phenomenon can be used as a method for determining the velocities of shock waves or supersonic moving bodies.

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5

Godin, Oleg A. "Underwater sound propagation over a layered seabed with weak shear rigidity." Journal of the Acoustical Society of America 157, no. 1 (2025): 314–27. https://doi.org/10.1121/10.0034864.

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The shear wave speed is often small compared to the compressional wave speed in the top part of the seabed, where acoustic normal modes penetrate. In sediments with weak but finite shear rigidity, the strongest conversion from compressional to shear waves occurs at interfaces within the sediment. Shear wave generation at such interfaces and interference within sediment layers lead to first-order perturbations in the normal mode phase speed and contributions to sound attenuation, which vary rapidly with frequency. Weak shear rigidity is shown to lead to unexpectedly strong mode group speed pert

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AVITAL, ELDAD J., RICARDO E. MUSAFIR, and THEODOSIOS KORAKIANITIS. "NONLINEAR PROPAGATION OF SOUND EMITTED BY HIGH SPEED WAVE PACKETS." Journal of Computational Acoustics 21, no. 02 (2013): 1250027. http://dx.doi.org/10.1142/s0218396x12500270.

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Jet's sound-field emitted by a large scale source modeled as a wave packet is considered. Attention is given to nonlinear propagation effects caused by the source's supersonic Mach number and high amplitude. The approach of the Westervelt equation is adapted to derive a new set of weakly nonlinear sound propagation equations. An optimized Lax–Wendorff scheme is proposed for the newly derived equations. It is shown that these equations can be simulated using a time step close to the CFL limit even for high amplitudes unlike the conventional finite-difference simulation approach of the Westervel

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Mulyaningsih, Rejeki Sri. "Effect of Amplitude and Frequency on the Speed of Sound Waves in Air and Water Using PhET Simulation." Jurnal Pendidikan dan Ilmu Fisika 4, no. 1 (2024): 40. http://dx.doi.org/10.52434/jpif.v4i1.3501.

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Sound waves can occur not only in solid medium but also in air and water mediums. The effect of amplitude and frequency on the speed of sound waves differs between air and water mediums. The speed of sound waves cannot be seen with the naked eye. A virtual lab is needed to determine the speed of sound wave propagation. The purpose of this study is to determine the effect of amplitude and frequency on the speed of sound waves in air and water medium. The research method used is a quantitative method by conducting experiments online using the PhET application. PhET is used because it can carry o

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GRIGORIEVA, NATALIE S. "THE EFFECT OF OCEAN CURRENT ON SOUND PROPAGATION." Journal of Computational Acoustics 02, no. 04 (1994): 441–51. http://dx.doi.org/10.1142/s0218396x94000257.

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The effect of medium motion on sound propagation in the ocean is investigated. In a moving fluid, the sound propagation is described by a system of seven linear partial differential equations for seven unknown elements of a sound wave. These are the sound pressure, the particle oscillation velocity in a sound wave as well as the changes of medium density, its entropy, and concentration of the salt caused by passage of a sound wave. In the case of stratified moving medium, the point source field is represented in the form of a sum of quasinormal waves. If the ocean perturbed by a current is wea

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9

Roberts, B. "Waves in Magnetic Flux Tubes." Symposium - International Astronomical Union 142 (1990): 159–74. http://dx.doi.org/10.1017/s0074180900087891.

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The basic aspects of wave propagation in a magnetic flux tube are reviewed, with particular emphasis on the types of flux tube that occur in the solar atmosphere. Two fundamental speeds arise naturally in a description of wave propagation in a flux tube: the slow magnetoacoustic (cusp) speed cT, which is both subsonic and sub-Alfvénic, and a mean Alfvén speed ck. Both surface and body modes are supported by a tube. It is stressed that a flux tube may act as a wave guide, similar to the guidance of light by a fibre optic, or sound in an ocean layer, or seismic waves in the Earth's crust.

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10

Yen, R. T., Y. C. Fung, H. H. Ho, and G. Butterman. "Speed of stress wave propagation in lung." Journal of Applied Physiology 61, no. 2 (1986): 701–5. http://dx.doi.org/10.1152/jappl.1986.61.2.701.

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The speed of stress waves in the lung parenchyma was investigated to understand why, among all internal organs, the lung is the most easily injured when an animal is subjected to an impact loading. The speed of the sound is much less in the lung than that in other organs. To analyze the dynamic response of the lung to impact loading, it is necessary to know the speed of internal wave propagation. Excised lungs of the rabbit and the goat were impacted with water jet at dynamic pressure in the range of 7–35 kPa (1–5 psi) and surface velocity of 1–15 m/s. The stress wave was measured by pressure

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11

Zhu, Wen-Fa, Guo-Peng Fan, Xiang-Zhen Meng, et al. "Ultrasound SAFT imaging for HSR ballastless track using the multi-layer sound velocity model." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 4 (2021): 199–208. http://dx.doi.org/10.1784/insi.2021.63.4.199.

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Accurate detection of void defects in ballastless track structures has become a core problem that needs urgent resolution for the maintenance and repair of high-speed railway (HSR) line structures in China. In this study, the root mean squaresynthetic aperture focusing technique (RMS-SAFT) ultrasound imaging method, which is suitable for the void defects of multi-layer structures, is proposed by combining the RMS velocity method and SAFT ultrasound imaging. First, a multi-layer sound velocity model (the relationship model between sound propagation time and sound propagation distance) of the HS

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CHANDRA, R., and S. SINGH. "Propagation of Laser Generated Shock Waves through Heterogeneous Metallic Mediums." Journal of Ultra Scientist of Physical Sciences Section B 36, no. 3 (2024): 19–27. http://dx.doi.org/10.22147/jusps-b/360301.

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This paper deals with an analytical study of shock waves propagating in heterogeneous metallic mediums. A shock wave travels through most media at a speed higher than ordinary wave. The propagation of a shock wave created by a laser impact over a metallic surface is considered here. In the process of Shock wave generation, a high-pressure surface level is reached using a nanosecond laser pulse that heats the surface of the material and generates adense plasma expansion. The pressure reaches few GPa so that shockwaves are generated and propagated in the bulk of the material. Whitham method, a p

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Coyle, Angus J., Md Ayub, Daniel Boettger, Manuel Cervera, and Andrew Mackinnon. "Impact of internal waves on underwater acoustic propagation." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A81. http://dx.doi.org/10.1121/10.0022867.

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The propagation of internal waves in the ocean can produce significant fluctuations in the local sound speed field. Understanding how these fluctuations affect acoustic propagation is an area of considerable interest in underwater acoustics. Previous studies have indicated that large fluctuations (of the order of 20 dB) in transmission loss (TL) of acoustic waves can occur due to focusing and defocusing effects as the acoustic waves propagate through an internal wave. This work looks to extend some of these studies by exploring the frequency and directional dependence of these fluctuations thr

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14

Zhang, Liang, Chun Xia Meng, and Jian Na. "Simulation for Range Prediction of Active Sonar in Shallow Water." Applied Mechanics and Materials 385-386 (August 2013): 514–17. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.514.

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In shallow water the acoustic wave from ambient noise sources carries a large number of environment information based on the complicated reflection both on the surface and seabed interface. The sound speed profile is one of the influencing factors of sound propagation characteristic, while for a long distance the sound absorption coefficient of water medium has an important significance to propagation range. The simulation results show that in shallow water sound absorption of seabed, sound speed profile and sound absorption of water were taken into account, then range prediction of active son

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15

Wafiyah, Dzihni, Hikmah Mauliddy, Muhammad Ikhfas Tanzilal, Ahmad Suryadi, and Fuji Hernawati Kusuma. "Analysis Of Comparative Results Of Standing Waves Between Waves On Guitar Strings And Waves On Strings." Jurnal Multidisiplin Indonesia 1, no. 4 (2023): 295–301. https://doi.org/10.62007/joumi.v1i4.187.

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This research aims to analyze the comparison of standing wave results between waves on a guitar string and waves on a cord. The study is conducted through two separate experiments, focusing on understanding the relationship between wave velocity and tension on the string, understanding the relationship between wave propagation speed and mass per unit length on the string, and analyzing the comparison of standing wave results. The first experiment is focused on observing the changes that occur as the tension value on the string increases. Meanwhile, the second experiment is designed to observe

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16

Ostashev, Vladimir E., D. Keith Wilson, Didier Dragna, and Jules Colas. "Parabolic equation with arbitrary variations in the sound speed and Mach numbers of the medium velocity." Journal of the Acoustical Society of America 152, no. 4 (2022): A81. http://dx.doi.org/10.1121/10.0015614.

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Among computational techniques in atmospheric and ocean acoustics and other fields such as seismic wave propagation, the parabolic equation (PE) approach is one of most popular now. The PE is well suited to small computers, large domains, and high frequencies. It can handle many complicated phenomena such as atmospheric and ocean stratification and refraction, scattering by turbulence, internal waves, and other inhomogeneities, ground impedance and ocean bottom interactions, and propagation over slowly varying terrain and ocean bathymetry. PEs are usually formulated for small variations in the

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17

Zakirov, M. N., S. N. Kulichkov, A. I. Chulichkov, et al. "ACOUSTIC PROBING OF THE ANISOTROPIC STRUCTURE OF THE ATMOSPHERE." Доклады Российской академии наук. Науки о Земле 511, no. 1 (2023): 98–104. http://dx.doi.org/10.31857/s2686739723600145.

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A new decomposition method (decomposition into N and U-waves) of infrasonic signals corresponding to partial reflection of N-wave sounding pulses from anisotropic atmospheric layers and recorded in areas of geometric shadow at large distances from explosions and volcanic eruptions is presented. The decomposition method makes it possible to determine the vertical gradients of the effective sound speed (sound speed plus wind speed in the direction of propagation) that are not available for determination by other methods.

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18

Grimshaw, R., L. A. Ostrovsky, A. S. Topolnikov, and K. R. Khusnutdinova. "Influence of Internal Wave on the Sound Propagation in the Subsurface Bubble Layer." Proceedings of the Mavlyutov Institute of Mechanics 8, no. 1 (2011): 54–64. http://dx.doi.org/10.21662/uim2011.1.005.

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In the paper the influence of non-linear internal wave on the propagation of acoustic signal in the subsurface ocean layer containing gas bubbles is considered. During interaction with surface waves the internal wave causes its collapse and influences the structure of bubble layer. Inhomogeneous structure of the layer promotes the local speed of sound and intensity of scattering near the ocean surface to modulate by internal wave with slight shift in phase in the direction of its propagation, which agree with recent experimental observations made on the shelf of Japan Sea.

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19

Liang, Zhang, Chun Xia Meng, and Hai Tao Xiao. "Comparison of Sound Propagation Characteristic between Deep and Shallow Water." Applied Mechanics and Materials 577 (July 2014): 1198–201. http://dx.doi.org/10.4028/www.scientific.net/amm.577.1198.

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The physical characteristics are compared between shallow and deep water, in physics and acoustics, respectively. There is a specific sound speed profile in deep water, which is different from which in shallow water, resulting in different sound propagation law between them. In this paper, the sound field distributions are simulated under respective typical sound speed profile. The color figures of sound intensity are obtained, in which the horizontal ordinate is distance, and the vertical ordinate is depth. Then we can get some important characteristics of sound propagation. The results show

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20

Badihi, Fachri Ali, Sri Pujiyati, Ayi Rahmat, Steven Solikin, and Muhammad Hisyam. "Acoustic Wave Propagation Patterns in the Ocean Column." Jurnal Segara 18, no. 3 (2022): 133. http://dx.doi.org/10.15578/segara.v18i3.11453.

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Temperature and salinity play a role in the speed of sound and the process of sound propagation of acoustic waves in the water. Research on the propagation of sound waves in the ocean is a very interesting topic to do because it has many applications, including in underwater wireless communication systems and maritime security. This study aimed to analyze the propagation of acoustic waves in different water depths. The modeling was carried out with flat wave characteristics, in which the bathymetry characteristics of the seawater were ignored. In this ray path simulation, the frequency of 5.3H

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21

Campos, L. M. B. C., and M. H. Kobayashi. "On the Propagation of Sound in a High-Speed Non-Isothermal Shear Flow." International Journal of Aeroacoustics 8, no. 3 (2009): 199–230. http://dx.doi.org/10.1260/147547208786940035.

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The propagation of sound in shear flows is relevant to the acoustics of wall and duct boundary layers, and to jet shear layers. The acoustic wave equation in a shear flow has been solved exactly only for a plane unidirectional homentropic mean shear flow, in the case of three velocity profiles: linear, exponential and hyperbolic tangent. The assumption of homentropic mean flow restricts application to isothermal shear flows. In the present paper the wave equation in an plane unidirectional shear flow with a linear velocity profile is solved in an isentropic non-homentropic case, which allows f

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22

Khlybov, Alexander A., Yuri G. Kabaldin, Maksim S. Anosov, Dmitry A. Ryabov, and Yuri I. Matveev. "RESEARCH OF THE RELATIONSHIP OF THE RATE OF ULTRASOUND IN METALS WITH THEIR IMPACT VISCOSITY AND HARDNESS UNDER THE CONDITIONS OF REDUCED TEMPERATURES." Russian Journal of Water Transport, no. 65 (November 23, 2020): 60–67. http://dx.doi.org/10.37890/jwt.vi65.128.

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The paper presents the results of the study of the relationship between the velocity of propagation of longitudinal waves in a metal with the values of impact toughness and hardness in a wide range of low temperatures. It’s been found that with a decrease of temperature, an increase of hardness, a decrease of impact toughness and an increase of the velocity of propagation of a longitudinal wave in the studied metals are observed, and the velocity of propagation of a longitudinal wave has a close correlation with the characteristics under consideration. An increase of the speed of sound with

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23

Champeaux, S., D. Laveder, T. Passot, and P. L. Sulem. "Remarks on the parallel propagation of small-amplitude dispersive Alfvénic waves." Nonlinear Processes in Geophysics 6, no. 3/4 (1999): 169–78. http://dx.doi.org/10.5194/npg-6-169-1999.

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Abstract. The envelope formalism for the description of a small-amplitude parallel-propagating Alfvén wave train is tested against direct numerical simulations of the Hall-MHD equations in one space dimension where kinetic effects are neglected. It turns out that the magnetosonic-wave dynamics departs from the adiabatic approximation not only near the resonance between the speed of sound and the Alfvén wave group velocity, but also when the speed of sound lies between the group and phase velocities of the Alfvén wave. The modulational instability then does not anymore affect asymptotically lar

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24

Péter, R., Arthur Tunyagi, and Alpár Simon. "Comparative Study on the Speed of Sound Measurement in Metals Based on Collision Time." Studia Universitatis Babeș-Bolyai Physica 68, no. 1-2 (2023): 67–81. http://dx.doi.org/10.24193/subbphys.2023.07.

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Several electrical measurement methods based on impact time measurements are presented in order to determine the sound propagation velocity in different metals. The sound impulses were initiated by dropping metal rods or tubes on a rigid anvil, and the speed of sound was determined by measuring the impact time and the time needed for the wave to propagate from the impacting end to the free end. Several electric methods are presented and compared; the results obtained for the speed of sound being in fair agreement with theory. The experiments described in this paper could be successfully used a

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25

Wu, Y. H., and Y. W. Huang. "Study on the effect of seafloor sound speed dispersion on sound propagation." Journal of Physics: Conference Series 2486, no. 1 (2023): 012098. http://dx.doi.org/10.1088/1742-6596/2486/1/012098.

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Abstract As one of the boundaries of ocean waveguide, the acoustic properties of seafloor sediments have been a hot research problem in ocean acoustic propagation and acoustic field modeling. The existing research has shown that the sound velocity in seafloor sediment is frequency dependent. In order to solve the problem that the sedimentary sound speed dispersing often be ignored in actual applications, this article uses the parabolic Newton to iterate to solve the dispersion equation to obtain the characteristic value of the normal mode. And the impact of frequency dispersion of sediment sou

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26

Short, Mark, and James J. Quirk. "The effect of compaction of a porous material confiner on detonation propagation." Journal of Fluid Mechanics 834 (November 17, 2017): 434–63. http://dx.doi.org/10.1017/jfm.2017.736.

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The fluid mechanics of the interaction between a porous material confiner and a steady propagating high explosive (HE) detonation in a two-dimensional slab geometry is investigated through analytical oblique wave polar analysis and multi-material numerical simulation. Two HE models are considered, broadly representing the properties of either a high- or low-detonation-speed HE, which permits studies of detonation propagating at speeds faster or slower than the confiner sound speed. The HE detonation is responsible for driving the compaction front in the confiner, while, in turn, the high mater

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27

Orzechowski, Michał, and Piotr Budniak. "Temperature dependence of sound wave propagation in as a diagnostic tool for healthy and rotten black alder (Alnus glutinosa (L.) Gaertn). trees trunks." Forest Resaerch Institute 74 (4) (December 1, 2013): 285–91. https://doi.org/10.2478/frp-2013-0027.

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The aim of this study was to determine how thermal conditions affect the speed of sound wave propagation, in trunks of living alder Alnus glutinosa (L.) Gaertn. trees. This method in practiced when diagnosing the presence of intern.al decay in standing trees. Field work was carried out four times at different temperatures (+13°C, +3°C, -7°C and -16°C) using an lmpulse Hammer. There was a significant correlation between the thermal conditions and the speed of sound wave propagation. Therefore, temperature must be taken into account to correctly diagnose tree health and timber qu

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28

Nie, Ruixin, Bin Wang, and Tengjiao He. "Extraction and analysis of three-dimensional sound scattering characteristics by body-generated internal waves." Journal of the Acoustical Society of America 154, no. 4_supplement (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 ac

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29

Orzechowski, Michał, and Piotr Budniak. "Temperature dependence of sound wave propagation in as a diagnostic tool for healthy and rotten black alder (Alnus glutinosa (L.) Gaertn). trees trunks." Forest Research Papers 74, no. 4 (2013): 285–91. http://dx.doi.org/10.2478/frp-2013-0027.

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Abstract The aim of this study was to determine how thermal conditions affect the speed of sound wave propagation, in trunks of living alder Alnus glutinosa (L.) Gaertn. trees. This method in practiced when diagnosing the presence of intern.al decay in standing trees. Field work was carried out four times at different temperatures (+13°C, +3°C, -7°C and -16°C) using an lmpulse Hammer. There was a significant correlation between the thermal conditions and the speed of sound wave propagation. Therefore, temperature must be taken into account to correctly diagnose tree health and timber quality.

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30

BÓDAI, TAMÁS, and MARIAN WIERCIGROCH. "ACOUSTIC RAY STABILITY FOR LONG-RANGE SOUND SPEED PROFILE TRANSITION SCENARIOS." International Journal of Bifurcation and Chaos 21, no. 01 (2011): 177–94. http://dx.doi.org/10.1142/s0218127411028350.

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Range-dependency in the background sound speed structure for deep ocean propagation scenarios is typical. Here a special case is considered when there is a gradual transition between single and double minimum sound speed profiles. Ray stability, an important measure for many applications, is analyzed. It is done by studying the unperturbed autonomous ray equations in the quasistatic limit. The wave guide is mapped out in terms of constant action curves in the vertical plane of propagation, which reveals a bifurcation effect in the studied wave guides. Conditions for the constancy or a sudden c

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Chen, Tzu-Ting, Ying-Tsong Lin, Linus Y. S. Chiu, and William L. Siegmann. "Coupled effects of nonlinear internal gravity waves and seabed properties on underwater sound propagation." Journal of the Acoustical Society of America 152, no. 4 (2022): A44. http://dx.doi.org/10.1121/10.0015482.

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Underwater sound propagation can be affected by strong sound speed gradients induced by nonlinear internal waves in the ocean. Meanwhile, geoacoustic properties of the seabed control acoustic reflections. Experimental data collected at the shelfbreak on the northeast of the South China Sea were analyzed to investigate the joint effects. Both two-dimensional (2D) and three-dimensional (3D) numerical sound propagation models with realistic seafloor and oceanographic inputs have been established to study the nonlinear internal wave effects observed on hydrophone vertical line array moorings. Comp

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Tam, Christopher K. W., and M. Salikuddin. "Weakly nonlinear acoustic and shock-wave theory of the noise of advanced high-speed turbopropellers." Journal of Fluid Mechanics 164 (March 1986): 127–54. http://dx.doi.org/10.1017/s0022112086002501.

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An acoustic and shock-wave theory of the noise generated by advanced turbo-propellers operating at supersonic tip helical velocity and high-subsonic cruise Mach number is developed. The theory includes the thickness and loading noise of the highly swept propeller blades. When operating at their design conditions these propellers radiate extremely intense sound waves. Because of the weakly nonlinear propagation effects these high-intensity acoustic disturbances steepen up quickly to form shock waves. In the present theory advantage is taken of the fact that in the blade fixed-rotating-coordinat

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DeCourcy, Brendan J., Matthew Milone, Ying-Tsong Lin, and William L. Siegmann. "Parameter dependence of acoustic quantities in a nonlinear internal wave duct." Journal of the Acoustical Society of America 141, no. 5_Supplement (2017): 3753. http://dx.doi.org/10.1121/1.4988281.

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Parameter dependence of acoustic quantities in a nonlinear internal wave duct BJD, Matt Milone, YTL Ocean features with 3-D spatial variability in shallow water can significantly affect acoustic propagation. One example is a curved front modeled with a discontinuous sound speed change over a sloping shelf [Lin and Lynch, JASA-EL (2012)], which has an extension to a continuous sound-speed change. An approach using normal modes and perturbation approximations yields convenient formulas that show how acoustic quantities depend on environmental parameters [DeCourcy et al., ASA, Salt Lake City (201

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Giombi, Lorenzo, Jani Dahl, and Mark Hindmarsh. "Signatures of the speed of sound on the gravitational wave power spectrum from sound waves." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 100. https://doi.org/10.1088/1475-7516/2025/01/100.

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Abstract Future space-based interferometers offer an unprecedented opportunity to detect signals from the stochastic gravitational wave background originating from a first-order phase transition at the electroweak scale. The phase transition is accompanied by a change of the equation of state from that of pure radiation. In this work we study the effect of this change on the power spectrum of gravitational waves generated by the sound waves in the plasma during the acoustic phase of the transition. We carry out an analytic calculation assuming that the sound speed and the fluid shear-stress th

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Parchevsky, K., A. Kosovichev, E. Khomenko, V. Olshevsky, and M. Collados. "Numerical simulation of propagation of the MHD waves in sunspots." Proceedings of the International Astronomical Union 5, H15 (2009): 354. http://dx.doi.org/10.1017/s1743921310009750.

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AbstractWe present results of numerical 3D simulation of propagation of MHD waves in sunspots. We used two self consistent magnetohydrostatic background models of sunspots. There are two main differences between these models: (i) the topology of the magnetic field and (ii) dependence of the horizontal profile of the sound speed on depth. The model with convex shape of the magnetic field lines near the photosphere has non-zero horizorntal perturbations of the sound speed up to the depth of 7.5 Mm (deep model). In the model with concave shape of the magnetic field lines near the photosphere Δ c/

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Zhou, Ji-Xun, Zhenglin Li, xuezhen zhang, and Jixing Qin. "Physics-based acoustic inversion of sound velocity and attenuation in low-velocity marine sediments." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A85. http://dx.doi.org/10.1121/10.0018257.

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Using data from the Yellow Sea, arrival times of the direct wave and surface/bottom reflections from explosive sources to a vertical hydrophone array are used to precisely determine each explosive source’s location, the source energy spectral density (SESD), and the water depth. Long-range propagation waveforms reveal modal dispersion: the ground wave, water wave, Airy phase, etc. There are two high-frequency (HF) groups of water waves. One propagates with the sound speed in the water below the thermocline, the other with a speed close to the sound speed in the water above the thermocline. The

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Malcoci, Iulian. "Sound Reasearch in Precessional Transmission." Applied Mechanics and Materials 657 (October 2014): 584–88. http://dx.doi.org/10.4028/www.scientific.net/amm.657.584.

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Sound may be defined as any pressure variation (in air, water or other medium) that the human ear can detect. Just like dominoes, a wave motion is set off when an element sets the nearest particle of air into motion. This motion gradually spreads to adjacent air particles further away from the source. Depending on the medium, sound propagates at different speeds. In air, sound propagates at a speed of approximately 340 m/s. In liquids and solids, the propagation velocity is greater 1500 m/s in water and 5000 m/s in steel [2].

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Poulier, P. L., D. Fournier, L. Gizon, and T. L. Duvall. "Acoustic wave propagation through solar granulation: Validity of effective-medium theories, coda waves." Astronomy & Astrophysics 643 (November 2020): A168. http://dx.doi.org/10.1051/0004-6361/202039201.

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Context. The frequencies, lifetimes, and eigenfunctions of solar acoustic waves are affected by turbulent convection, which is random in space and in time. Since the correlation time of solar granulation and the periods of acoustic waves (∼5 min) are similar, the medium in which the waves propagate cannot a priori be assumed to be time independent. Aims. We compare various effective-medium solutions with numerical solutions in order to identify the approximations that can be used in helioseismology. For the sake of simplicity, the medium is one dimensional. Methods. We consider the Keller appr

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Jensen, Bjørn Christian Skov, and Kim Knudsen. "Sound speed uncertainty in acousto-electric tomography." Inverse Problems 37, no. 12 (2021): 125011. http://dx.doi.org/10.1088/1361-6420/ac37f8.

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Abstract The goal in acousto-electric tomography is to reconstruct an image of the unknown electric conductivity inside an object from boundary measurements of electrostatic currents and voltages collected while the object is penetrated by propagating ultrasound waves. This problem is a coupled-physics inverse problem. Accurate knowledge of the propagating ultrasound wave is usually assumed and required, but in practice tracking the propagating wave is hard due to inexact knowledge of the interior acoustic properties of the object. In this work, we model uncertainty in the sound speed of the a

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Petr, V. "Wave propagation in wet steam." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 8 (2004): 871–82. http://dx.doi.org/10.1243/0954406041474237.

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Linear wave equations for equilibrium and subcooled wet steam are introduced in the paper, accounting for thermal and inertial relaxation processes between the vapour and droplets. Relations for sonic velocity and absorption were found to be frequency dependent. Analysis of propagation of a step pressure disturbance suggests that the frozen speed of sound should be used to define, for example, the direction of characteristics and conditions for choking of a wet steam flow. It is concluded further that in a near-equilibrium approximation the non-linear wave phenomena in a wet steam can be analy

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Löfgren, Sebastian Kilde, Mathilda Virta, Javier Tello Marmolejo, Annie Ringvall Moberg, Jonas Enger, and Dag Hanstorp. "Drones as observers and students as data points: a large-scale demonstration of sound waves." Physics Education 59, no. 2 (2024): 023004. http://dx.doi.org/10.1088/1361-6552/ad1e74.

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Abstract Sound is central in everyday life, and the physics of sound is present in many parts of physics education. A common way to teach physics concepts is to conduct experiments or show a phenomenon through demonstrations. However, it is far from trivial to get students to experience the wave nature of sound firsthand. This paper presents three experiments where students become part of the demonstration, which allows them to experience the propagation of sound waves, the speed of sound, and wave interference. By having students listen to sound produced by a speaker and filming their reactio

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Kucukosmanoglu, Murat, John A. Colosi, Peter F. Worcester, et al. "Observations of the space/time scales of Beaufort sea acoustic duct variability and their impact on transmission loss via the mode interaction parameter." Journal of the Acoustical Society of America 153, no. 5 (2023): 2659. http://dx.doi.org/10.1121/10.0019335.

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The Beaufort duct (BD) is a subsurface sound channel in the western Arctic Ocean formed by cold Pacific Winter Water (PWW) sandwiched between warmer Pacific Summer Water (PSW) and Atlantic Water (AW). Sound waves can be trapped in this duct and travel long distances without experiencing lossy surface/ice interactions. This study analyzes BD vertical and temporal variability using moored oceanographic measurements from two yearlong acoustic transmission experiments (2016–2017 and 2019–2020). The focus is on BD normal mode propagation through observed ocean features, such as eddies and spicy int

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Hursky, Paul, Alison B. Laferriere, and Emanuel F. Coelho. "Addressing non-linearity in tomography using ray theory." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A27. https://doi.org/10.1121/10.0034988.

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Ocean acoustic tomography has been formulated as a linearized inversion of a forward model based on ray tracing. In this formulation, we are solving for refinements of a zero-order sound speed model that reproduce measured travel times, travel times that are also being modeled by the ray tracer. The linear approximation is based on calculating travel time perturbations by integrating the sound speed refinements over the ray paths, assuming the ray paths themselves are not impacted by the sound speed refinements. Clearly, the offset between the presumed (zero-order) sound speed and the actual s

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Shrivastava, Rohit Kumar, and Stefan Luding. "Effect of disorder on bulk sound wave speed: a multiscale spectral analysis." Nonlinear Processes in Geophysics 24, no. 3 (2017): 435–54. http://dx.doi.org/10.5194/npg-24-435-2017.

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Abstract. Disorder of size (polydispersity) and mass of discrete elements or particles in randomly structured media (e.g., granular matter such as soil) has numerous effects on the materials' sound propagation characteristics. The influence of disorder on energy and momentum transport, the sound wave speed and its low-pass frequency-filtering characteristics is the subject of this study. The goal is understanding the connection between the particle-microscale disorder and dynamics and the system-macroscale wave propagation, which can be applied to nondestructive testing, seismic exploration of

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GRIGORIEVA, NATALIE S., and GREGORY M. FRIDMAN. "DEPENDENCE OF THE AXIAL WAVE ON RANGE AND SOUND-SPEED PROFILE PROPERTIES IN A RANGE-INDEPENDENT OCEAN." Journal of Computational Acoustics 13, no. 02 (2005): 259–78. http://dx.doi.org/10.1142/s0218396x05002712.

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For ducted propagation in a waveguide when the source and receiver are placed closely to the depth of the waveguide axis, there exist cusped caustics repeatedly along the axis. In neighborhoods of these cusped caustics, the interference of the wave fields that correspond to near-axial rays occurs. This results in the formation of a coherent structure (the axial wave) that propagates along the waveguide axis like a wave. In this paper the integral representation of the axial wave obtained before for an arbitrary waveguide in a two-dimensional range-independent medium is generalized to a three-d

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Wei, Kang, Yuangui Mei, Qi Sun, and Xiao Hu. "Propagation Characteristics of Initial Compression Wave Induced by 400 km/h High-Speed Trains Passing through Very Long Tunnels." Applied Sciences 14, no. 13 (2024): 5946. http://dx.doi.org/10.3390/app14135946.

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When high-speed trains enter tunnels, an initial compression wave is generated. As the compression wave propagates at the local speed of sound to the tunnel exit, it radiates into the surrounding environment, forming micro-pressure waves (MPWs). MPWs create sonic booms, resulting in significant environmental issues. The magnitude of the micro-pressure waves is directly proportional to the pressure gradient of the compression wave at the tunnel exit. The nonlinear effects of the initial compression wave during propagation lead to a significant increase in pressure gradient. Therefore, the propa

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Nurhidayati, Anisa, Albertus Djoko Lesmono, and Lailatul Nuraini. "ANALISIS FREKUENSI BUNYI DAN CEPAT RAMBAT GELOMBANG BUNYI PADA ALAT MUSIK TRADISIONAL ANGKLUNG." JURNAL PEMBELAJARAN FISIKA 11, no. 3 (2022): 85. http://dx.doi.org/10.19184/jpf.v11i3.32325.

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The research is motivated by cultural aspects that must be preserved and studied in various scientific fields, including physics. One of the interesting cultural elements to study is the traditional musical instrument, the angklung. This study aims to analyze the frequency and speed of sound waves in angklung. The benefit of this research is to get the cognitive content of science and as a form of cultural preservation of the angklung musical instrument. This type of research is quantitative with experimental methods. Collecting data is by measuring the physical quantities on the angklung. The

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XIE Jinhuai, ZHANG Haigang, and CAO Dejin. "Low grazing angle reflection and the shear-wave resonance over a layer of elastic–solids sediment." Acta Physica Sinica 74, no. 16 (2025): 0. https://doi.org/10.7498/aps.74.20250656.

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The low-grazing-angle reflection from an elastic sediment seabed exhibits singularly enhanced frequency characteristics, which significantly influence long-range sound propagation in shallow water. To study the influence of elastic sedimentary layer seabed environment on long-range sound propagation in shallow waters, we conducted a joint measurement of seabed and waveguide sound propagation experiment in the Dongsha area of the South China Sea. The experiment recorded the simultaneous occurrence of seabed resonance and the sound siphon effect for the first time. Notably, this effect differs f

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Cheng, K. J. "Wave Characteristics of Heat Conduction Using a Discrete Microscopic Model." Journal of Heat Transfer 111, no. 2 (1989): 225–31. http://dx.doi.org/10.1115/1.3250666.

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The wave properties of heat conduction are studied using a discrete velocity microscopic model. In this model, molecules move with two possible speeds along one of six allowable directions, and the molecular dynamics are governed by the Boltzmann transport equation. Macroscopic quantities such as temperature and density are extracted from the distribution of molecules among various possible states. It is found that at a low degree of rarefaction (low Knudsen number), an initial temperature pulse simply spreads out with time without exhibiting any wavelike behavior. But at a high degree of rare

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DeFilippis, Jacob P., Bruce Cornuelle, Andrew J. Lucas, et al. "Micro-multipath interference and its effect on sub-minute acoustic fluctuations: Observations of mid-frequency acoustic propagation in the upper ocean." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A124. http://dx.doi.org/10.1121/10.0018381.

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An experiment was conducted to investigate how variability in the acoustic channel impulse response at signal processing timescales of seconds to minutes is related to internal-wave-driven changes in the ocean sound speed field on timescales of tens of minutes. We find that vertical fine-scale structures (≤10 m) embedded in the sound speed profile have strong second derivatives which allow for the formation of acoustic caustics as well as acoustic propagation pathways that interfere with each other (micro-multipaths). Both effects are sensitive to vertical displacement by internal waves, which

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