Acoustical Physics最新文献

{"title":"Effect of Bottom Properties in Acoustic Distance Measurement on the Shallow-Water Arctic Shelf","authors":"D. D. Sidorov,&nbsp;V. G. Petnikov","doi":"10.1134/S106377102560038X","DOIUrl":"10.1134/S106377102560038X","url":null,"abstract":"<div><p>The impact of seabed characteristics on the accuracy in determining the distance between a sound source and receiver located underwater was studied by numerical experiments. Experimental data on bottom parameters and the sound speed profile in the water layer in the (hydrological) summer and winter in the shallow-water part of the Kara Sea were used. In the latter case, the effect of ice cover was taken into account. It has been found that the main error in determining the distance in the 1–10 km interval is associated with the multimode (multiray) nature of the acoustic wave propagation in the sound channel between the water surface and bottom. It has been demonstrated that this error decreases to several meters in summer and with a waterlike bottom, when the sound speeds in the water layer and bottom are close to each other. It has been noted that horizontal refraction of acoustic waves caused by the transverse inhomogeneity of the bottom also leads to errors in determining distance, although to a lesser extent.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 3","pages":"413 - 421"},"PeriodicalIF":1.2,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021711","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":"On a Method for Classifying Hydroacoustic Radiation Sources at the Output of Adaptive Spatial Processing","authors":"G. S. Malyshkin","doi":"10.1134/S1063771025600482","DOIUrl":"10.1134/S1063771025600482","url":null,"abstract":"<p>This paper describes the methodology and results of marine experiments on the construction and analysis of direction-finding reliefs and recorded trajectories from the standpoint of classifying observed sources (surface and underwater objects) in noise direction-finding mode as applied to autumn conditions in a coastal wedge area. It is shown that, in noise direction-finding mode, trajectory bearing modulation occurring when signals propagate with reflection from boundaries, namely, the surface and bottom, can be used in addition to the known classification features for distinguishing surface and underwater objects. This modulation is efficiently detected after the power of strong signals is limited.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 3","pages":"453 - 466"},"PeriodicalIF":1.2,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021556","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":"Effect of the Diameter of the Central Opening on Nonlinear Acoustic Field Characteristics of High-Intensity Focused Ultrasound Transducers","authors":"F. A. Nartov,&nbsp;M. M. Karzova,&nbsp;V. A. Khokhlova","doi":"10.1134/S1063771024602681","DOIUrl":"10.1134/S1063771024602681","url":null,"abstract":"<div><p>A number of novel noninvasive surgical technologies utilizing high-intensity focused ultrasound (HIFU) are based on using nonlinear acoustic effects that lead to distortion of the wave when it propagates from an ultrasound transducer and formation of shock fronts at the focus. Typically, such transducers that generate a high-power ultrasound beam, have near axially symmetric shape with a central circular opening to accommodate a diagnostic probe for visualization purposes. To predict the focal field parameters of such transducer geometries, an equivalent source model of a spherical segment is convenient, as nonlinear effects in its field are well studied. The equivalent source parameters (diameter, focal length, and amplitude) are optimized to closely approximate the focal region of the original transducer along the axial coordinate. This paper investigates the effect of the central opening size on the nonlinear field characteristics and applicability of the equivalent source model for a typical therapeutic ultrasound transducer with a frequency of 1 MHz and <i>F</i>_# = 0.9. It is demonstrated that the size of the central opening significantly affects the degree of nonlinear waveform distortion in the focal region, and the equivalent source model can be applied only when the diameter of the central opening is less than 20% of the transducer diameter.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 3","pages":"346 - 356"},"PeriodicalIF":1.2,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063771024602681.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021710","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}

{"title":"Wave Stop Bands in a Double-Periodic Elastic Waveguide from Bodies Connected to Each Other by Thin Rods","authors":"S. A. Nazarov","doi":"10.1134/S1063771024602619","DOIUrl":"10.1134/S1063771024602619","url":null,"abstract":"<p>A periodic isotropic and homogeneous elastic waveguide composed of identical massive bodies connected to each other by thin horizontal rods and attached to a rigid half-space by vertical rods was studied. Using the dimension reduction procedure on the rods and analyzing the interaction between rigid displacements and singular fields in a body, the asymptotics of eigenvalues depending on the Floquet parameters was constructed in the model problem on a periodicity cell. As a result, asymptotic formulas were found for the lengths and positions of spectral (wave pass) bands, and open spectral gaps (wave stop bands) were revealed.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"170 - 179"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861540","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":"Numerical Simulation of Volumetric Ultrasound Heating of Biological Tissue with Surface Cooling","authors":"P. A. Pestova,&nbsp;A. N. Rybyanets,&nbsp;O. A. Sapozhnikov,&nbsp;M. M. Karzova,&nbsp;P. V. Yuldashev,&nbsp;S. A. Tsysar,&nbsp;L. M. Kotelnikova,&nbsp;I. A. Shvetsov,&nbsp;V. A. Khokhlova","doi":"10.1134/S1063771025600172","DOIUrl":"10.1134/S1063771025600172","url":null,"abstract":"<div><p>One of the undesirable effects of using ultrasound for extracorporeal therapy is skin overheating, caused by both ultrasound absorption and contact with the heated surface of the acoustic transducer. To suppress this effect, a forcibly cooled contact medium can be placed between the skin and the irradiating surface. A novel ultrasound applicator implementing this approach has recently been proposed and developed at Southern Federal University. It uses a rectangular piezoelectric transducer bonded to an aluminum plate for volumetric heating of subcutaneous biological tissue. The plate is cooled by circulating cold water through laterally drilled channels. This article presents a numerical algorithm for calculating the three-dimensional temperature field in tissue during the operation of this applicator. The simulation was based on the inhomogeneous heat equation. Experimental acoustic holography data obtained for the developed transducer were used to calculate the heat sources in tissue. An example of heating bovine liver tissue <i>ex vivo</i> is considered, with irradiation times ranging from several seconds to several min. The simulation results were compared with experimental data on tissue thermal ablation at an acoustic power of 12 W and an ultrasound frequency of 6.96 MHz. It is shown that the combination of thermal tissue exposure and contact boundary cooling allows for volumetric tissue heating with a temperature maximum at a depth of 8 to 15 mm, while maintaining a negligible temperature change at depths up to 2–3 mm.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"190 - 200"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861398","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":"Investigation of Sound Reflection and Transmission through an Elastic Layer with Inclusions Using the Finite Element Method","authors":"I. A. Usacheva,&nbsp;I. A. V’yushkina,&nbsp;P. I. Korotin,&nbsp;M. B. Salin","doi":"10.1134/S1063771024602127","DOIUrl":"10.1134/S1063771024602127","url":null,"abstract":"<p>The article describes the absorption properties of acoustic materials. The emphasis is on rubberlike materials with inclusions of cavities that provide resonance dissipation mechanisms. Testing of the developed methodology and a study of the accuracy of the method by comparison with previously published results are presented. Changes in the acoustic properties of a heterogeneous material under external load conditions in a linear formulation are analyzed.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"180 - 189"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861541","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":"The Possibility of Detecting Geological Bodies without Velocity Contrast in the Field of Surface Waves","authors":"A. A. Tsukanov,&nbsp;A. V. Gorbatikov","doi":"10.1134/S1063771024603054","DOIUrl":"10.1134/S1063771024603054","url":null,"abstract":"<p>Using a mathematical model within the framework of the linear theory of elasticity, the problem—interesting from both theoretical and practical points of view—of surface wave irradiation of an elastic half-space containing a single buried body whose physical properties are different from those of the host medium material, but whose elastic moduli and density change in a consistent manner so that the velocity of both P- and S-waves do not differ from those in the host medium, is considered. It is shown that such buried heterogeneities, despite the lack of velocity contrast, can be detected and mapped both in plan view and at depth in the broadband field of Rayleigh surface waves based on variations in the spectral amplitude of the signal recorded at several points on the surface.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"253 - 262"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063771024603054.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861542","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}

{"title":"Statistical Characteristics of the Internal Structure of the Seismic Background over a Hydrocarbon Deposit","authors":"I. Ya. Chebotareva","doi":"10.1134/S1063771024602565","DOIUrl":"10.1134/S1063771024602565","url":null,"abstract":"<div><p>The fine structure of the seismic background in the territory of an oil field was studied using polyspectral analysis and surrogate models. The statistical test for Gaussianity and linearity showed that the natural seismic background in the 1–50 Hz frequency range is a nonlinear process. Bicoherence graphs revealed statistically significant peaks of phase-coupled triplets with a characteristic geometry of peak clustering in the triangular principal domain. To analyze the quasi-noise component of the seismic background, surrogate time series with a randomized phase spectrum were generated, the bispectra of which are free of triplet peaks. Bispectral analysis of surrogate series showed the presence of a non-Gaussian quasi-noise component in the seismic background in the frequency range of 1–6 Hz. Previously, the results of the analysis of the used set of records by two completely different methods, each of which extracts information from different components of the seismic background, quasi-noise and regular, were published. These studies showed that each of the two components contains information sufficient to estimate the total thickness of the productive intervals under the recording point. Based on the results of the bispectral analysis and the features of the algorithms of the two methods, a conclusion was made that the quadratically phase-coupled triplets and the non-Gaussian quasi-noise component in the field territory are manifestations of endogenic seismic emission and are generated by the same nonlinear process developing in the vicinity of an oil-saturated reservoir. The mechanism of seismic emission should be sought in the class of phenomena with quadratic nonlinearity. The statistical characteristics of the internal structure of the seismic background near oil wells have similar features that differ greatly from the statistical characteristics of the seismic record near a “dry” well located outside the reservoir and not producing oil. Previously unknown prognostic features of the oil/water saturation type of rocks have been identified.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"263 - 276"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861572","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":"Experimental Method for Determining Energy Losses in Oscillatory Systems Based on ARMA Modeling","authors":"I. A. Karpov,&nbsp;Yu. I. Bobrovnitskii","doi":"10.1134/S1063771025600329","DOIUrl":"10.1134/S1063771025600329","url":null,"abstract":"<p><b>Abstract</b>—Damping (dissipation, energy losses) is the most important parameter of all mechanical oscillatory systems, in addition to elasticity and inertia. Its special role is due to the fact that it directly determines the maximum amplitudes of free and forced vibrations of systems and, accordingly, their dynamic strength and reliability, noise and ecology. Due to the poor study of the physical processes of damping, it is measured experimentally. This article presents one of the new efficient methods for experimental determination of losses, characterized by simplicity, high accuracy and a wide range of applicability. The main attention is paid to substantiation of the method, its properties, and its verification in numerical and laboratory experiments. The method is recommended for measuring the losses of composite highly damped oscillatory systems, where known methods do not work or are too complex.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"144 - 162"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861569","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":"Sound Insulation of Fuselage Aircraft Structures with Different Compositions of Resonance Elements","authors":"A. Ya. Zverev,&nbsp;L. A. Lazarev,&nbsp;I. V. Pankratov","doi":"10.1134/S1063771024603091","DOIUrl":"10.1134/S1063771024603091","url":null,"abstract":"<p>Reducing noise in the cabin of propeller aircraft is an urgent problem of internal acoustics, since traditional sound-insulating structures are insufficiently effective in the low-frequency region. One promising method for solving it is to use resonance systems, with which it is possible to significantly increase the sound insulation of the fuselage structure of aircraft in this frequency range. The study determined the effect of resonance systems on the sound-insulating ability of flat and cylindrical panels without and with cross stiffening simulating the body bulkhead frame was experimentally determined, as well as the effectiveness of facing the passenger compartment with resonance systems with different compositions. Tests were carried out in sound chambers and on a full-scale bench, which is a real passenger plane. The tested structures were faced with elastoacoustic compensators of various types with resonance elements made of foil, micalent paper, and thermopolyurethane. It is shown that the efficiency of resonance systems can reach 10–20 dB or more.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"71 2","pages":"277 - 281"},"PeriodicalIF":1.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861596","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}