Acoustical Physics最新文献

{"title":"Physical and Mathematical Foundations of Acoustic Recognition of Object and Subject Materials","authors":"V. S. Davydov","doi":"10.1134/S1063771026700065","DOIUrl":"10.1134/S1063771026700065","url":null,"abstract":"<p>A new method for acoustic recognition of body materials is proposed, based on the difference in the <i>Q</i>-factors of their resonance oscillations (Patent no. 2635829). Compared to the previously known method of recognizing absolutely hard and absolutely soft bodies based on phase changes in reflected signals, this method expands the range of recognizable acoustic target materials and enables the discrimination of artificial objects (submarines, robots, mines, etc.) from natural objects (fish, marine mammals, the seabed, etc.) in the marine environment. This method is invariant to multipath propagation of hydroacoustic signals in the marine environment and is applicable for material recognition in the air and terrestrial environments during mineral exploration.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"72 1","pages":"121 - 134"},"PeriodicalIF":0.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148349720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluctuations of Low-Frequency Sound Intensity Near the Shelf Break in the Presence of Internal Waves","authors":"V. A. Grigorev,&nbsp;A. A. Lunkov,&nbsp;M. A. Shermeneva","doi":"10.1134/S1063771025601153","DOIUrl":"10.1134/S1063771025601153","url":null,"abstract":"<p>This paper examines the motion of internal waves with a pronounced large soliton along two mutually perpendicular stationary acoustic paths, 32 and 19 km long, which took place during the ASIAEX 2001 experiment in the South China Sea. The bathymetry of the paths varied significantly. The first path crossed the shelf break and was characterized by a monotonic depth change from 350 to 120 m. The second path passed along the upper edge of the shelf break and featured a gentle depression 30 m deep, beyond which the sea depth remained relatively constant (~125 m). Fluctuations in the depth-averaged low-frequency sound intensity in the 215–330 Hz frequency range associated with internal waves were studied in detail. The analysis, including sound field modeling based on mode theory and a wide-angle parabolic equation, showed that the physical causes of the average-intensity fluctuations and their characteristics depend significantly on the bathymetry of the paths. Comparison of the modeling and experimental results allowed us to determine the key parameters of the waveguide. For the first path, the sound speed in the bottom was determined from the magnitude of the fluctuation variance. For the second path, bottom losses were determined from the linear slope of the fluctuation curve. During semidiurnal monitoring, it was found that the values of the dominant frequency of intensity fluctuations are virtually independent of the presence or absence of intense internal waves and solitons on the paths. This indicates that background internal waves during the specified time have approximately the same anisotropy and velocity as intense internal waves and solitons.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"72 1","pages":"68 - 89"},"PeriodicalIF":0.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148349810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic Instability of a Circular Vortex with a Smoothed Vorticity Profile in the Subsonic and Supersonic Case","authors":"V. F. Kopiev,&nbsp;S. A. Chernyshev","doi":"10.1134/S1063771025601062","DOIUrl":"10.1134/S1063771025601062","url":null,"abstract":"<div><p>It is known that disturbances of a localized vortex can have two specific mechanisms of interaction with the surrounding flow. The first is associated with energy loss by the flow, which leads to instability when the energy of the vortex disturbances is negative. The second is the Miles mechanism of interaction between vortex core oscillations and disturbances in the vicinity of the critical layer (the streamline along which the phase velocity of the disturbances coincides with the velocity of the mean flow). This is accompanied by an energy flux from this vicinity, leading to damping of the oscillations in the case of negative energy (and, conversely, to Miles instability when the energy of the core disturbances is positive). A flow in which both of these mechanisms occur simultaneously is considered for the first time. For this, disturbances of circular vortices with negative energy are considered, for which both acoustic instability and Miles damping occur. It is shown that in the case of weak compressibility, the Miles mechanism can completely suppress acoustic instability. However, in the case of stronger energy loss due to acoustic radiation, acoustic instability will dominate. The influence of various parameters on these effects is analytically studied, and a quantitative criterion for the acoustic instability of a vortex with a smoothed vorticity profile is established. The effect of acoustic instability is considered for high velocities in the vortex core, including supersonic flow. Flow velocity enhances the acoustic instability increment due to more efficient sound radiation, which enables instability of vortices with stronger smoothness. This effect demonstrates that the behavior of vortex structures in high-speed jets can differ fundamentally from the case characterized by a low Mach number and, due to acoustic instability, intensify vortex oscillations, which in the subsonic case are characterized by strong damping. It is also shown that in an incompressible flow with a vortex confined by impedance walls, an alternative energy loss mechanism to the acoustic one is realized. In this case, Miles damping can also be overcome. Moreover, unlike the mechanism realized by outgoing acoustic waves, energy loss by the vortex due to absorption by the cylinder walls can be significantly more effective, leading to an expansion of the instability region to flows with smoother vorticity profiles.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 5","pages":"755 - 768"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147617934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sonic Boom Characteristics Under Strong Atmospheric Turbulence Using A Supersonic Civil Aircraft Demonstrator As An Example","authors":"A. O. Korunov,&nbsp;S. Bakhne,&nbsp;L. A. Usov,&nbsp;A. I. Troshin,&nbsp;V. S. Gorbovskoy","doi":"10.1134/S1063771025600871","DOIUrl":"10.1134/S1063771025600871","url":null,"abstract":"<div><p>Based on the wave equation exact within the framework of linear acoustics of moving media, a scalar equation on acoustic pressure in the atmospheric boundary layer is obtained. The main approximations for diffraction and turbulent fluctuations transport effects are derived. Based on these, HOWARD and KZK-type models are developed. The two-dimensional KZK-type equation is applied to the problem of calculating the sonic boom characteristics from civil supersonic aircraft demonstrator “Strizh” under development in TsAGI in conditions of strong velocity fluctuations in atmospheric boundary layer. Mesh and statistical convergence of simulation results is achieved. The three-step structure of the demonstrator’s pressure signature front shock leads to a small change in amplitude and a significant loudness reduction in PL metric compared to the results obtained for N-waves under similar conditions.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 6","pages":"900 - 917"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147618002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Soundscape of the Metropolis: Influence of Human Adaptation to the Sound Environment on Assessment of Its Quality","authors":"N. G. Kanev,&nbsp;L. K. Rimskaya-Korsakova,&nbsp;I. L. Margolina,&nbsp;A. I. Komkin","doi":"10.1134/S1063771025601049","DOIUrl":"10.1134/S1063771025601049","url":null,"abstract":"<div><p>The creation of quiet green areas to reduce acoustic stress contributes to improving the quality of life of citizens in noisy cities, reducing stress levels and enhancing the uniqueness of urban spaces. Quantitative indicators for assessing the quality of the sound environment are in demand when designing such zones, ensuring harmony between urban dynamics and the human need for silence. It is believed that human adaptation to the sound environment leads to the fact that residents of megacities stop noticing annoying sounds, although this does not negate their harmful effects on the nervous system, resulting in its exhaustion. In the interest of studying the properties of perception of the sound environment depending on its properties, as well as the degree of adaptation of residents to the environment, a cross-comparison of assessments of the quality of the sound environment, as well as the values of acoustic characteristics of spaces in the territories adjacent to the building, was carried out. The survey was conducted by two groups of respondents in academic buildings of two leading universities: Lomonosov Moscow State University (MSU) and Bauman Moscow State Technical University (MSTU). The first group consisted of 30 third-year students from MSU, and the second, of 25 third-year students from MSTU. To assess the quality of the sound environment, the hearing examination method introduced by the International Organization for Standardization for Analysis of Soundscapes (ISO) was used. We assumed that the students of the two universities are well adapted to the sound and landscape environment of Moscow, and over the years, they have developed a sustainable attitude towards the environment of their university. A comparison of estimates of the quality of sound media and their acoustic properties indicates that MSU students were less sensitive to loud noise and quiet sounds of nature on the territories of the two universities. The reason for such differences may be the adaptation of MSU students to the environment of their university, which promotes natural audiovisual relaxation and increases psychoemotional stability.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 5","pages":"790 - 799"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147618009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Sensitivity of Decaying Wave Propagating Through a Medium with No Surface Traction","authors":"Maaz Ali Khan,&nbsp;Adnan Jahangir,&nbsp;Emad E. Mahmoud,&nbsp;Mohammed Almuzaini,&nbsp;Usman Riaz,&nbsp;Afzal Rahman","doi":"10.1134/S1063771025600615","DOIUrl":"10.1134/S1063771025600615","url":null,"abstract":"<p>This study presents a comprehensive analysis of the sensitivity of decaying Rayleigh waves propagating through semiconductor elastic solids within the framework of generalized thermoelasticity. The medium is modeled as a half-space semiconductor rotating at a constant angular frequency, and the effects of key thermoelastic and rotational parameters on wave propagation are investigated. A fractional-order three-phase lag (3PL) heat conduction model is employed, incorporating higher-order time derivatives to capture coupled thermoelastic behavior. The secular equation for Rayleigh waves is derived analytically, and normalized local sensitivity analysis (NLSA) is applied to quantify the influence of input parameters including rotation <span>(left( Omega right))</span>, fractional order <span>(left( alpha right))</span>, and phase lags on wave properties. Silicon is used as a representative material, with all computations carried out in MATLAB. Results show that increases in Ω and α lead to higher phase velocity and penetration depth, while reducing attenuation and specific heat loss. Sensitivity rankings reveal that Ω and α are the most influential parameters, while <span>({{tau }_{v}})</span> and <span>({{tau }_{T}})</span> have negligible effects, making them suitable for factor fixing. This is the first study to couple fractional-order 3PL thermoelasticity with rotational effects in semiconductors while employing NLSA for parameter ranking, revealing up to 22% attenuation reduction at high rotation rates consistent with SAW gyroscope experiments. This work provides novel insight by integrating fractional-order 3PL thermoelastic modeling with NLSA in a rotating semiconductor context, offering valuable guidance for the design of surface-wave-based sensing and optoelectronic devices<i>.</i></p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 5","pages":"699 - 711"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147617930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the Operation of Scalar Wave Filters—Isotropic Wavelets—in the Field of Wall Turbulent Pressure Fluctuations","authors":"E. B. Kudashev,&nbsp;L. R. Yablonik","doi":"10.1134/S1063771025601141","DOIUrl":"10.1134/S1063771025601141","url":null,"abstract":"<div><p>The results of scalar filtering in the field turbulent wall pressure fluctuations under a homogeneous boundary layer are estimated. The article focuses to the operation of extremely compact scalar wave filters formed from two receiving elements—a central circular one and an adjacent external annular one. Such a two-element receiver operates as a wave filter and can be treated as an isotropic wavelet if the recorded total signal under coherent pulsating action on the elements is zero. It is established that two-element wavelet filters are capable of providing a satisfactory solution to the problem of estimating the characteristics of a scalar spectrum. The filtering results are close for different smooth distributions of local sensitivity over the radius. The outer diameters of the two-element receivers are approximately 1.5 wavelengths to which the wave filter is tuned. Three-element scalar wave filters–wavelets with two ring elements and an external diameter of approximately 2.2 lengths of the recorded wave are capable of significantly improving the filtering quality in the short-wavelength zone of the wave spectrum. The prospects of using the investigated receivers in problems of spatial wavelet analysis of turbulent fields of wall pressure fluctuations are noted.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 5","pages":"769 - 776"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147617933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic Properties of a Biaxial Potassium Titanyl Arsenate KTiOAsO4 Crystal","authors":"M. G. Milkov,&nbsp;A. I. Kokshayskiy,&nbsp;V. I. Balakshy","doi":"10.1134/S1063771025601360","DOIUrl":"10.1134/S1063771025601360","url":null,"abstract":"<div><p>This paper presents the acoustic properties of a potassium titanyl arsenate crystal, a promising acousto-optic material. The elastic constants for this crystal were determined, as well as phase velocity of acoustic waves and angles between the phase and group material velocity vectors. The acoustic parameters of the crystal were calculated based on experimental data from the Schaefer–Bergmann diagram and elastic wave velocity measured with the phase method.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 6","pages":"840 - 846"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147618001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solitonic Disintegration of Acoustic-Gravity Waves in the Atmosphere: 1. KdV–Burgers Equation","authors":"S. P. Kshevetskii,&nbsp;Yu. A. Kurdyaeva,&nbsp;N. M. Gavrilov,&nbsp;S. N. Kulichkov","doi":"10.1134/S1063771025600950","DOIUrl":"10.1134/S1063771025600950","url":null,"abstract":"<p>The process of propagation and disintegration of long low-frequency nonlinear acoustic-gravity waves into the upper atmosphere is investigated. One spectral wave mode is considered, for which an approximate nonlinear Korteweg-de Vries–Burgers equation is derived using the formulated version of the variational principle for a fluid layer. The coefficients of the derived equation depend on the height. The issue of wave destruction into smaller-scale solitary waves is investigated in the study. The conditions for wave destruction are written out and formulas for estimating the scales of secondary soliton waves formed during the disintegration of the primary wave are written out. It is shown that wave destruction can occur only in certain layers determined by the vertical structure of the wave.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 5","pages":"777 - 789"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147617992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Noise Absorption Properties of Nanoporous Ceramic Silica Grains","authors":"K. V. Zobov,&nbsp;S. P. Bardakhanov,&nbsp;V. R. Gaponenko,&nbsp;D. Yu. Trufanov,&nbsp;B. Z. Garmaev","doi":"10.1134/S1063771025601116","DOIUrl":"10.1134/S1063771025601116","url":null,"abstract":"<p>The possibility of using the grains formed from nanosized silica powders as materials reducing acoustic vibrations was studied. Grains with sizes from several hundreds of micrometers to several millimeters were obtained by drying from aqueous suspensions of nanopowders and crushing the dry compacts with further classification by sizes. The resulting materials are characterized by open porosity with nanosized pores, whose volume attains more than 50% from the volume of grains. They were further used as an independent noise-absorbing material layer and as a modifier of foam polymer materials used, in particular, in cars. It has been shown that, for grained nanoporous materials based on nanoparticles, it is possible to find optimal configurations depending on the required band of suppressing the frequencies of acoustic vibrations. The use of a bulk layer from such a material with a thickness of 10 mm increases the noise absorption coefficient of a substrate to values above 0.5 for the frequencies from 400 to 1600 Hz. The results may be useful for the construction of new theoretical approaches in continuum mechanics, in particular, in acoustic physics.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 5","pages":"689 - 698"},"PeriodicalIF":1.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063771025601116.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147617994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}