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Three-Dimensional Wide-Angle Parabolic Equations with Propagator Separation Based on Finite Fourier Series
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771024602206
P. V. Yuldashev, E. O. Konnova, M. M. Karzova, V. A. Khokhlova
{"title":"Three-Dimensional Wide-Angle Parabolic Equations with Propagator Separation Based on Finite Fourier Series","authors":"P. V. Yuldashev,&nbsp;E. O. Konnova,&nbsp;M. M. Karzova,&nbsp;V. A. Khokhlova","doi":"10.1134/S1063771024602206","DOIUrl":"10.1134/S1063771024602206","url":null,"abstract":"<p>A possibility of constructing wide-angle diffraction models using Fourier series decomposition of the propagation operator of one-way wave equations is investigated. The propagation operator is considered as a function of the propagation step, reference wavenumber, and transversal Laplacian operator, which appears under the square-root of the pseudodifferential operator in the theory of one-way equations. It is shown that in this operator formalism, Fourier series decomposition approximates the one-way propagator by a weighted sum of exponential propagators, whose structure is similar to the propagator of the standard or small-angle parabolic equation. The exact propagator is modified using Hermite interpolation polynomials in order to achieve two crucial properties that guarantee fast convergence of the Fourier series: propagator periodicity and continuity of its derivatives. It is demonstrated that for three-dimensional diffraction problems, contrary to the standard split-step Padé approach, the proposed wide-angle propagation model allows for using efficient numerical methods and operator splitting procedures available for the standard parabolic equation. As a result, it is possible to organize computations separately along each of the two coordinate axes that are perpendicular to the predominant direction of wave propagation.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"783 - 796"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109014","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}
引用次数: 0
Validation of a Quadrupole Model of Sound Radiation of a Turbulent Jet Based on Multi-Microphone Acoustic Measurements
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771024602814
V. F. Kopiev, S. A. Chernyshev, G. A. Faranosov, A. A. Korobov
{"title":"Validation of a Quadrupole Model of Sound Radiation of a Turbulent Jet Based on Multi-Microphone Acoustic Measurements","authors":"V. F. Kopiev,&nbsp;S. A. Chernyshev,&nbsp;G. A. Faranosov,&nbsp;A. A. Korobov","doi":"10.1134/S1063771024602814","DOIUrl":"10.1134/S1063771024602814","url":null,"abstract":"<div><p>A low-order model of quadrupole sound sources in a turbulent jet has been developed using the acoustic analogy method. Multimicrophone acoustic measurements of jet sound radiation are used to estimate the model parameters and validate it. Based on measurements carried out in different zones of the sound field, estimates of the size of the effective localization region of sound sources are made and the boundaries of the zone of dominance of quadrupole sound radiation over pseudo-sound fluctuations are determined. The proposed model can be used in practical estimates of the spectral and correlation characteristics of the far and near sound field of the jet.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"850 - 864"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063771024602814.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109373","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}
引用次数: 0
Determining the Minimum Number of Compensating Monopole Sources Required to Suppress the Integral Radiation Level
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771024602723
I. Sh. Fiks, G. E. Fiks
{"title":"Determining the Minimum Number of Compensating Monopole Sources Required to Suppress the Integral Radiation Level","authors":"I. Sh. Fiks,&nbsp;G. E. Fiks","doi":"10.1134/S1063771024602723","DOIUrl":"10.1134/S1063771024602723","url":null,"abstract":"<div><p>Multidimensional optimization algorithms were used to numerically solve the problem of determining the minimum number of compensating monopole sources located in free space on two spherical surfaces surrounding the primary source, providing a given value of suppression of its integral radiation level.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"914 - 918"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109379","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}
引用次数: 0
Pulsed Excitation Source in a Speech Signal
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771024602838
V. N. Sorokin
{"title":"Pulsed Excitation Source in a Speech Signal","authors":"V. N. Sorokin","doi":"10.1134/S1063771024602838","DOIUrl":"10.1134/S1063771024602838","url":null,"abstract":"<p>The properties of a speech burst of closure are studied by using a database of 39 speakers with single-digit and multi-digit numerals and parallel recording of signals on a telephone handset and a directional microphone. A speech burst is detected by short-term and long-term detectors of spectral-temporal inhomogeneities and by a detector for the measure of similarity between the eigenfunctions of a consonant burst spectrum and a current speech burst spectrum. The probability for the presence of a voiced or voiceless closure is estimated in the spaces of an amplitude spectrum and a group delay spectrum from the ratio between the energies in the high- and low-frequency regions. The place of articulation for a back-lingual consonant influences the probability distribution for the duration of the interval between the onsets of a speech burst and a vowel, for the frequency of a peak with a maximum amplitude in the high-frequency region, for the ratio between the energies in the spectral regions of high and low frequencies of a speech burst, and also for the measure of similarity between the eigenfunctions of a consonant burst spectrum and a current speech burst spectrum.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"899 - 913"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109377","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}
引用次数: 0
Study of the Acoustic Perceptibility of Vehicles Moving at a Constant Speed
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771023600584
A. O. Subbotkin, G. N. Kuznetsov, E. V. Talachev, G. A. Romanenko, A. S. Tyurin
{"title":"Study of the Acoustic Perceptibility of Vehicles Moving at a Constant Speed","authors":"A. O. Subbotkin,&nbsp;G. N. Kuznetsov,&nbsp;E. V. Talachev,&nbsp;G. A. Romanenko,&nbsp;A. S. Tyurin","doi":"10.1134/S1063771023600584","DOIUrl":"10.1134/S1063771023600584","url":null,"abstract":"<p><b>Abstract</b><i>—</i>The article presents the results of an experiment on assessing subjective indicators of acoustic perceptibility by pedestrians (experts) of a vehicle approaching at a constant speed and some conclusions. Subjective indicators of perceptibility were defined as the distance between the vehicle and the expert, at the moment when the expert heard (recorded) the sound of an approaching car, as well as the time of the car’s approach to the expert at that moment. Subjective indicators of perceptibility are compared with the objective parameters of car noise measured in accordance with UN Regulation no. 138: the sound pressure level, its frequency response, and the sound level. The study is motivated by the problem of traffic safety of electrified vehicles with low noise, which include, in particular, electric cars and electric scooters. The article publishes the first results of a research paper devoted to increasing the perceptibility of low-noise vehicles for pedestrians without damaging the acoustic ecology of cities and suburbs.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"880 - 886"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109010","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}
引用次数: 0
Slit Shear Waves in a Quasi PT-Symmetric Piezoelectric Heterostructure Near the Mode Degeneracy Point
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771024601766
E. A. Vilkov, O. A. Byshevsky-Konopko, D. V. Kalyabin, S. A. Nikitov
{"title":"Slit Shear Waves in a Quasi PT-Symmetric Piezoelectric Heterostructure Near the Mode Degeneracy Point","authors":"E. A. Vilkov,&nbsp;O. A. Byshevsky-Konopko,&nbsp;D. V. Kalyabin,&nbsp;S. A. Nikitov","doi":"10.1134/S1063771024601766","DOIUrl":"10.1134/S1063771024601766","url":null,"abstract":"<p>The propagation of slit shear waves in a quasi-symmetric structure of piezoelectrics of the 4mm symmetry class has been theoretically studied. It has been shown that taking into account the unequal level of loss and gain in piezoelectrics results in either intersection, touching, or convergence of two modes at the point of their degeneracy (singular point) in the shear wave spectrum. It has been found that the intersection of the mode spectra occurs only in the case of equal loss and gain magnitudes (a <i>PT</i>-symmetric structure). Based on this, it is concluded that using the pattern of the spectra near a singular point, it is possible to determine the level of imbalance of gain and loss in piezoelectric waveguides. As in the case of a purely <i>PT</i>-symmetric structure, the frequency dependence of the amplitude at an exceptional point of a quasi <i>PT</i>-symmetric structure (with a rather small difference in loss and gain levels) exhibits a very narrow peak, which opens up the possibility of creating hypersensitive sensors based on them. Thus, it has been shown that even at unequal loss and gain levels in piezoelectrics (a quasi <i>PT</i>-symmetric structure), it is possible to obtain a structure with all the characteristics of a <i>PT</i>-symmetric structure.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"808 - 815"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109094","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}
引用次数: 0
Physical Modeling of the Hydroacoustic Field of a Marine Propeller
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2025-01-24 DOI: 10.1134/S1063771024601912
A. V. Stulenkov, V. V. Artelniy, P. I. Korotin, A. S. Suvorov, I. E. Gorbuntsov, M. S. Norkin, S. G. Zaitseva
{"title":"Physical Modeling of the Hydroacoustic Field of a Marine Propeller","authors":"A. V. Stulenkov,&nbsp;V. V. Artelniy,&nbsp;P. I. Korotin,&nbsp;A. S. Suvorov,&nbsp;I. E. Gorbuntsov,&nbsp;M. S. Norkin,&nbsp;S. G. Zaitseva","doi":"10.1134/S1063771024601912","DOIUrl":"10.1134/S1063771024601912","url":null,"abstract":"<div><p>The article presents a study of the acoustic field of the propeller, including at the resonance frequencies of its blades. The study is based on a computational and experimental approach with the combined use of numerical and experimental physical modeling. The article shows the importance of taking into account the elastic resonances of the propeller in the design, demonstrates the methods of physical and numerical modeling used, which provide high accuracy in determining the resonance frequencies of the blades in water and in air. Using the example of two propeller models made of different materials, the effect of the <i>Q</i>-factor on the levels and type of radiation spectrum is experimentally demonstrated.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 5","pages":"872 - 879"},"PeriodicalIF":0.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109376","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}
引用次数: 0
Physical Modeling of the Method of Coherent Probing of Low-Contrast Bottom Layers in a Laboratory Tank 实验室水槽中低对比度底层相干探测方法的物理建模
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024601821
V. I. Kalinina, P. N. Vyugin, I. A. Kapustin
{"title":"Physical Modeling of the Method of Coherent Probing of Low-Contrast Bottom Layers in a Laboratory Tank","authors":"V. I. Kalinina,&nbsp;P. N. Vyugin,&nbsp;I. A. Kapustin","doi":"10.1134/S1063771024601821","DOIUrl":"10.1134/S1063771024601821","url":null,"abstract":"<div><p>Under laboratory conditions, experimental verification of the developed algorithms for reconstructing low-contrast bottom layers during their coherent sensing was carried out. The algorithms use parametric models for generating signals reflected from a layered half-space in the form of a set of elastic layers. To solve the problem at the Department of Acoustics of Nizhny Novgorod State University, an experimental setup was created for the formation, emission, and reception of high-resolution sound pulses reflected from a set of elastic layers placed in a tank of water. The experimental study showed the possibility of using the coherent sensing method for layered media with relatively similar acoustic parameters. Processing of the data obtained resulted in good agreement between the developed computational model of probing acoustic pulse signals reflected from a layered bottom and the physical modeling data. It is shown that analysis of the plane of the geoacoustic parameters of a specific problem using the developed numerical model makes it possible to assess the capabilities of a promising method for coherent diagnostics of low-contrast bottom layers.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"659 - 669"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737327","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}
引用次数: 0
Influence of the Metal Structure and Plastic Deformation on the Nonlinear Acoustic Parameter 金属结构和塑性变形对非线性声学参数的影响
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024601468
A. V. Vanyagin, A. V. Ilyakhinskii, V. M. Rodyushkin
{"title":"Influence of the Metal Structure and Plastic Deformation on the Nonlinear Acoustic Parameter","authors":"A. V. Vanyagin,&nbsp;A. V. Ilyakhinskii,&nbsp;V. M. Rodyushkin","doi":"10.1134/S1063771024601468","DOIUrl":"10.1134/S1063771024601468","url":null,"abstract":"<p>A practical task of testing samples of various metals using the principles of nonlinear acoustics is being solved. A surface acoustic wave (surfactant), whose propagation process, due to nonlinear effects, is accompanied by generation of a wave of doubled frequency, was used for testing. An experimental device is used to monitor the structural state of a metal sample by recording a change in the nonlinear acoustic parameter (NAP). To excite surfactants, a wedge transducer with a resonance frequency of 1 MHz was used. The transmitted wave was recorded with a wedge transducer with a resonance frequency of 2 MHz. It has been shown that the NAP for the tested materials in the initial state has different values not only for materials belonging to different classes, but also for materials belonging to the same structural class and having different chemical compositions (12Kh17G9AN4 and 12Kh18N10Т). A plastic deformation by 2% does not lead to a NAP change for the AMg6 alloy and 12Kh17G9AN4, 20Kh13N4G9, and 10KhSND steels. The NAP change by 2% as a result of a plastic deformation for the 12Kh18N10T and 08Kh17N4M3 stainless steels is caused by a change in their phase compositions associated with the martensitic transformation. The presented data on the change in the NAP from early stages of the elastoplastic deformation to a predestruction for AMg6 and 10KhSND steels demonstrate the possibility of using it as a prognostic criterion for the limiting state of the material.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"608 - 612"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063771024601468.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737330","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}
引用次数: 0
Sound Waves in a Medium with Resonance Inclusions of a Dipole Type 带有偶极型共振内含物的介质中的声波
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S106377102460181X
N. G. Kanev, M. A. Mironov
{"title":"Sound Waves in a Medium with Resonance Inclusions of a Dipole Type","authors":"N. G. Kanev,&nbsp;M. A. Mironov","doi":"10.1134/S106377102460181X","DOIUrl":"10.1134/S106377102460181X","url":null,"abstract":"<div><p>An elastic medium with inclusions that are small compared to the sound wavelength and differ in density is considered. If the inclusions are resonators that respond equally to the influence of waves coming from different directions, then the effective density of the medium in a certain frequency band becomes negative. If the direction of the dipole moment of the resonators is fixed, then the medium with inclusions has an anisotropic effective density. The Helmholtz equation for such a medium was obtained, and the field of a point source was studied.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"602 - 607"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737331","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}
引用次数: 0
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