Acoustical Physics最新文献_第2页

A Multielement Low-Frequency Ultrasonic Transducer as a Source of High-Intensity Focused Ultrasound in Air 作为空气中高强度聚焦超声源的多元件低频超声换能器

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024601936

S. A. Asfandiyarov, S. A. Tsysar, O. A. Sapozhnikov

{"title":"A Multielement Low-Frequency Ultrasonic Transducer as a Source of High-Intensity Focused Ultrasound in Air","authors":"S. A. Asfandiyarov, S. A. Tsysar, O. A. Sapozhnikov","doi":"10.1134/S1063771024601936","DOIUrl":"10.1134/S1063771024601936","url":null,"abstract":"<p>The acoustic and electrical properties of a 128-element ultrasonic transducer designed to generate high-intensity focused ultrasound in air in the low-frequency ultrasonic range are investigated. To reduce parasitic grating maxima of the acoustic field, a spiral arrangement of piezoelectric elements on a spherical base was used. The operating frequency of the transducer was 35.5 kHz, and the diameter of the source and focal length were approximately 50 cm, significantly exceeding the wavelength (approximately 1 cm). This selection of parameters allowed for effective focusing, with localization of wave energy in a small focal region, thereby achieving extremely high levels of ultrasonic intensity. The parameters of the ultrasonic field were studied using a combined approach that included microphone recording of the acoustic pressure and measuring the acoustic radiation force acting on a conical reflector. Acoustic source parameters were determined from the two-dimensional spatial distribution of the acoustic pressure waveform, which was measured by scanning the microphone in a transverse plane in front of the source. Numerical modeling of nonlinear wave propagation was also used based on the Westervelt equation to simulate the behavior of intense waves. The acoustic pressure level reached 173 dB, with a focal spot size comparable to the wavelength.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"759 - 768"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063771024601936.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737334","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

Application of Low-Frequency Acoustic Signals to Study Underwater Gas Seepage 应用低频声学信号研究水下气体渗流

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024601742

D. A. Kosteev, N. A. Bogatov, A. V. Ermoshkin, I. A. Kapustin, A. A. Molkov, D. D. Razumov, M. B. Salin

{"title":"Application of Low-Frequency Acoustic Signals to Study Underwater Gas Seepage","authors":"D. A. Kosteev, N. A. Bogatov, A. V. Ermoshkin, I. A. Kapustin, A. A. Molkov, D. D. Razumov, M. B. Salin","doi":"10.1134/S1063771024601742","DOIUrl":"10.1134/S1063771024601742","url":null,"abstract":"<div><p>Remote sensing of seeps, the release of gas (mainly methane) from the seabed, is an urgent problem. The importance of detecting seeps in the Arctic shelf zone is constantly increasing due to degradation of underwater permafrost and the release of gas hydrates. Gas bubbles scatter underwater sound and their corresponding resonance frequencies are in the kilohertz range for seeps observed in nature. A promising method for detecting and studying seeps is probing with underwater sound near the denoted resonance frequency. This corresponds to a decrease in the operating frequency with respect to the traditional method of studying high-frequency sonars, so the proposed method will be classified as low-frequency in this study. This method expands the study area due to the low sound attenuation in water and the high scattering level near bubble resonances. The scattering strength was estimated taking into account collective interaction (group effects) of bubbles. The possibility of using low-frequency hydroacoustic systems to detect seeps is demonstrated using the results of a full-scale experiment using a simulated bubble jet as an example. A data processing method for detecting nonstationary scatterers is proposed.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"670 - 682"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737016","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

Self-Contained Vertical Acoustic–Hydrophysical Measuring Systems Mollyusk-19 and Mollyusk-21 自给式垂直声学-水文物理测量系统 Mollyusk-19 和 Mollyusk-21

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024602425

A. N. Rutenko, D. G. Kovzel, V. A. Gritsenko

引用次数: 0

Dynamics of a Spherical Cavity in a Cavitating Liquid with a Continuously Changing Concentration of Cavitation Nuclei 空化核浓度持续变化的空化液体中球形空腔的动力学特性

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024602401

V. K. Kedrinsky, A. A. Cherevko

{"title":"Dynamics of a Spherical Cavity in a Cavitating Liquid with a Continuously Changing Concentration of Cavitation Nuclei","authors":"V. K. Kedrinsky, A. A. Cherevko","doi":"10.1134/S1063771024602401","DOIUrl":"10.1134/S1063771024602401","url":null,"abstract":"<p>The study derives an equation and solves for the first time the problem on the formation and radiation dynamics of a quasi-empty pulsating spherical cavity in a cavitating liquid under the influence of variable sound velocity in a cavitation and cavitation nuclei concentration zone. The data on the cavity dynamics, radiation, and collapsing velocity for a spectrum of initial internal pressures show that, at a maximum gas phase concentration, pulsations are different in the degree of their compression. They have almost identical character: after the first collapse, only a single half-cycle is completed to attain different constant equilibrium radii. The condition of equality between the pressures in a cavitation zone and inside a spherical cavity at its boundary makes it possible to establish a dynamic relation between the volumetric concentration (sound speed) in the cavitation zone and the radius of this spherical cavity for the first time. When calculating and constructing the solution, the condition that the initial cavity size takes a value corresponding to the initial pressure is changed. The dependences of radiation amplitudes over the entire range of applied pressures are plotted. It turns out that the radiation amplitude increases by five orders of magnitude, when the initial pressure inside a cavity changes by three orders of magnitude from 10<sup>–2</sup> to 10<sup>–5</sup> atm.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"626 - 634"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737014","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

On the Average Field Intensity and Individual Modes of a Low-Frequency Sound Signal in a Shallow Waveguide with a Statistically Rough Bottom Boundary 论具有统计粗糙底部边界的浅波导中低频声信号的平均场强和个别模式

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024602437

O. E. Gulin, I. O. Yaroshchuk, R. A. Korotchenko

{"title":"On the Average Field Intensity and Individual Modes of a Low-Frequency Sound Signal in a Shallow Waveguide with a Statistically Rough Bottom Boundary","authors":"O. E. Gulin, I. O. Yaroshchuk, R. A. Korotchenko","doi":"10.1134/S1063771024602437","DOIUrl":"10.1134/S1063771024602437","url":null,"abstract":"<div><p>For a low-frequency sound signal propagating in a horizontally inhomogeneous waveguide in shallow water, the influence of a fluctuating interface between the water layer and fluid bottom sediments was studied based on statistical modeling using the cross-sectional method. The modeling was carried out for hydrological conditions in many situations corresponding to the shallow shelf zones of the Russian Arctic seas. A specific feature of these water areas is the presence of an almost homogeneous water layer on poorly consolidated bottom sediments with various characteristics, including a high degree of gas saturation. The dependence of the average intensity of the sound signal and its individual modes on the parameters of the problem has been studied: the characteristic scale of fluctuations of the interface and impedance of this interface, which determines its penetrable properties. It is shown that the influence of bathymetric fluctuations on the average intensity of acoustic modes has its own characteristics versus the influence of random volumetric inhomogeneities of the sound speed in the water layer and sediments, established earlier. Thus, bottom roughness of a relatively small scale leads, on average, to increased attenuation of a sound signal when propagating in a waveguide, and this can occur at relatively short distances from the source. An increase in the reflectivity of a rough bottom boundary weakens the effect of increased sound attenuation so that for typical values of sound speed in the bottom, attenuation at distances of 10–20 km from the source differs little from that for an undisturbed horizontal boundary.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"641 - 658"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737328","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

Effect of Geometry on Flexural Wave Propagation in a Notched Bar 几何形状对凹槽棒中挠性波传播的影响

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024602000

A. A. Agafonov, M. Yu. Izosimova, R. A. Zhostkov, A. I. Kokshayskiy, A. I. Korobov, N. I. Odina

引用次数: 0

Atomic Sodium Sonoluminescence Features during Bubble Collapse in a Cavitation Cloud by Time-Correlated Single Photon Counting 通过时间相关的单光子计数分析空化云中气泡塌缩过程中的原子钠声致发光特征

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024601778

M. V. Kazachek, T. V. Gordeychuk

{"title":"Atomic Sodium Sonoluminescence Features during Bubble Collapse in a Cavitation Cloud by Time-Correlated Single Photon Counting","authors":"M. V. Kazachek, T. V. Gordeychuk","doi":"10.1134/S1063771024601778","DOIUrl":"10.1134/S1063771024601778","url":null,"abstract":"<p>The pulse width of multibubble sonoluminescence flashes in an aqueous NaCl solution was measured by a correlation method for the spectral range of 300–800 nm. The flash pulse width had a maximum value of 21 ns in the spectral region adjacent immediately to the Na <i>D</i>-line peak (589 nm) and decreased to 2 ns with distance from the line peak. The measured dependence of the flash pulse width on the wavelength agreed with the dynamic Na line shape model proposed by us earlier, where the spectral line width and shift were governed by a fast change in the emitting medium density during bubble collapse. Using the correlation method, the sequence of metal and continuum flashes was determined to measure the relative delay between them. The results showed that Na emission takes a longer time as compared to continuum emission and occurred almost symmetrically in time around a continuum flash with a vanishingly small delay of 0.21 ns after the continuum flash. Using the same method for a CeCl<sub>3</sub> solution, a cerium line flash (350 nm) was revealed to occur after a continuum flash with a delay of 31 ns close to the Ce emission lifetime of 33 ns to be indicative of essential distinction between the mechanisms of Na and Ce emission under multibubble sonoluminescence.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"619 - 625"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737015","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

Modification of Dean’s Method for Determining Impedance with an Inhomogeneous Sound Field in a Resonator 修改迪安方法，以确定谐振器中不均匀声场的阻抗

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-11-27 DOI: 10.1134/S1063771024601869

V. V. Palchikovskiy

{"title":"Modification of Dean’s Method for Determining Impedance with an Inhomogeneous Sound Field in a Resonator","authors":"V. V. Palchikovskiy","doi":"10.1134/S1063771024601869","DOIUrl":"10.1134/S1063771024601869","url":null,"abstract":"<div><p>A modification of Dean’s method is proposed for determining the impedance in the case of a nonuniform sound field on the front and bottom surfaces of a resonator. Instead of acoustic pressures in Dean’s formula, the modification uses the coefficients of eigenfunctions, which correspond to a uniform acoustic pressure distribution on the front and bottom surfaces of the resonator. The eigenproblem is solved by the finite element method; the coefficients of the eigenfunctions are found by the least squares method. At the current stage of research, the full-scale experiment has been replaced by numerical simulation in a linear formulation of sound propagation in an impedance tube with normal wave incidence with a honeycomb resonator attached to it. The inhomogeneity of the pressure field over the cross section of the resonator is created from the different positions of holes in the resonator face plate. The study is done for a different number of acoustic pressure measurement points at the bottom of the resonator. Calculations show that the proposed method is efficient and provides good agreement with the straight method for determining impedance. However, the possibilities of using modification of Dean’s method in full-scale measurements are limited, because accurate resonator impedance determination requires a large number of measurement points.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":"70 4","pages":"733 - 744"},"PeriodicalIF":0.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737336","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

Peculiarities of Flexural Wave Propagation in a Notched Bar 凹槽棒中挠性波传播的特殊性

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601997

A. A. Agafonov, M. Yu. Izosimova, R. A. Zhostkov, A. I. Kokshayskiy, A. I. Korobov, N. I. Odina

引用次数: 0

On the Evolution of a System of Shock Waves Created by Engine Fan Blades 论发动机风扇叶片产生的冲击波系统的演变

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601985

M. A. Yudin, V. F. Kopiev, S. A. Chernyshev, G. A. Faranosov, M. A. Demyanov, O. P. Bychkov

引用次数: 0