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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
{"title":"Peculiarities of Flexural Wave Propagation in a Notched Bar","authors":"A. A. Agafonov,&nbsp;M. Yu. Izosimova,&nbsp;R. A. Zhostkov,&nbsp;A. I. Kokshayskiy,&nbsp;A. I. Korobov,&nbsp;N. I. Odina","doi":"10.1134/S1063771024601997","DOIUrl":"10.1134/S1063771024601997","url":null,"abstract":"<p>We present the results of numerical simulation and experimental studies of the propagation of fle-xural elastic waves in a notched metal bar with a rectangular cross section that approximates the acoustic black hole effect. The sample is a notched bar; the depth of notches increases according to a power law with an exponent of 4/3. The experimental results and the results of numerical simulation confirm that such bars slow the propagation velocity of an elastic wave towards the end of the bar. It is demonstrated that flexural waves in such structures exhibit dispersion and their amplitude at the end of the bar for some eigenfrequencies is higher than that in a solid bar. The eigenmode shapes of a solid and notched bar are compared together with the distribution of the flexural wave amplitude along the bars. The frequency dependence of the flexural wave length is studied during wave propagation towards the end of the notched bar.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266793","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 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
{"title":"On the Evolution of a System of Shock Waves Created by Engine Fan Blades","authors":"M. A. Yudin,&nbsp;V. F. Kopiev,&nbsp;S. A. Chernyshev,&nbsp;G. A. Faranosov,&nbsp;M. A. Demyanov,&nbsp;O. P. Bychkov","doi":"10.1134/S1063771024601985","DOIUrl":"10.1134/S1063771024601985","url":null,"abstract":"<div><p>One source of modern aircraft engine noise is the fan, which is especially noticeable during takeoff at high angular rotation speeds. In such modes, supersonic flow around the fan blades occurs, which leads to the formation of shock waves that propagate upstream until they exit the engine duct. As a result, specific noise is emitted into the front hemisphere, consisting of a number of harmonics that are multiples of the fan rotation frequency. The paper analyzes this effect using a simple model of the propagation of a system of shock waves. An energy approach is used to demonstrate that a system of shock waves with shocks of equal amplitude attenuates the most rapidly.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266939","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
Recognition of the Psychoneurological State of Children with Autism Spectrum Disorders Based on Speech Signals: Acoustic and Perceptual Characteristics 根据语音信号识别自闭症谱系障碍儿童的精神神经状态：声音和感知特征
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024602085
A. S. Nikolaev
{"title":"Recognition of the Psychoneurological State of Children with Autism Spectrum Disorders Based on Speech Signals: Acoustic and Perceptual Characteristics","authors":"A. S. Nikolaev","doi":"10.1134/S1063771024602085","DOIUrl":"10.1134/S1063771024602085","url":null,"abstract":"<div><p>Recognition by adults of the psychoneurological state of children with autism spectrum disorders (ASD), <i>n</i> = 35, and typically developing (TD) children, <i>n</i> = 47, aged 5–14 years, was studied. A perceptual analysis was carried out, in which adult native Russian speakers (auditors) took part, <i>n</i> = 206. For perceptual analysis, test sequences (audio tests) were created containing words and phrases of children with ASD and TD children, selected from spontaneous speech recordings. The auditors were faced with the problem of determining the psychoneurological state of a child based on auditory perception: typical–atypical development. A spectrographic analysis of the speech material of children with ASD and TD children was carried out. The phrases of children with ASD are characterized by a lower speech rate compared to the phrases of TD children, as well as fewer words, longer duration of stressed and unstressed vowels in words, higher values of the frequency of the fundamental tone in the phrase, word, and stressed and unstressed vowels.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266951","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
Thermal Ablation of Biological Tissue by Sonicating Discrete Foci in a Specified Volume with a Single Wave Burst with Shocks 通过单次冲击波爆发在指定体积内声波消融离散病灶，实现生物组织的热消融
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601663
P. A. Pestova, P. V. Yuldashev, V. A. Khokhlova, M. M. Karzova
{"title":"Thermal Ablation of Biological Tissue by Sonicating Discrete Foci in a Specified Volume with a Single Wave Burst with Shocks","authors":"P. A. Pestova,&nbsp;P. V. Yuldashev,&nbsp;V. A. Khokhlova,&nbsp;M. M. Karzova","doi":"10.1134/S1063771024601663","DOIUrl":"10.1134/S1063771024601663","url":null,"abstract":"<div><p>New protocols have been developed of biological tissue volumes with shock-wave bursts using trajectories uniformly filled with discrete foci within a given volume. Each focus was sonicated with a millisecond-long pulse, which immediately generated a single thermal lesion. In developing the most advantageous irradiation protocols, the effect of the source peak power at a constant time-averaged value, the distance between single foci, and geometry of the outer contour of the trajectory on the shape, volume, and thermal ablation rate was analyzed. It is shown that for an arbitrary geometry of the outer contour of a single-layer trajectory, the most advantageous is the saturation mode of the shock front amplitude at the array focus using a trajectory with a spatial step 1.5 times greater than the transverse size of the single lesion. To obtain thermal ablation volumes on the order of cubic centimeters, protocols have been suggested with layer-by-layer irradiation of tissue, which make it possible to accelerate the thermal ablation process by 2.5 times compared to protocols used in clinical practice. The advantage of the proposed protocols that use the shock-wave exposure is the ability to generate localized and predictable thermal lesion without using MRI temperature monitoring.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266938","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
Analysis of Aeroacoustic Characteristics of a Supersonic Jet at Designed Conditions Based on Numerical Simulation Data 基于数值模拟数据的设计条件下超音速喷气机气声特性分析
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771023601474
O. P. Bychkov, I. Yu. Mironyuk, I. A. Solntsev, G. A. Faranosov, M. A. Yudin
{"title":"Analysis of Aeroacoustic Characteristics of a Supersonic Jet at Designed Conditions Based on Numerical Simulation Data","authors":"O. P. Bychkov,&nbsp;I. Yu. Mironyuk,&nbsp;I. A. Solntsev,&nbsp;G. A. Faranosov,&nbsp;M. A. Yudin","doi":"10.1134/S1063771023601474","DOIUrl":"10.1134/S1063771023601474","url":null,"abstract":"<div><p>Numerical simulation of the aeroacoustic characteristics of a supersonic jet issuing from a Laval nozzle into space at rest at the design condition (Mach number M = 2) was carried out. The results of calculations using the large eddy simulation (LES) method are presented. The mean and fluctuation characteristics of the flow in the jet, as well as the characteristics of the jet noise in the far field, including its azimuthal composition, were obtained. The calculation results are compared with experimental data, and their satisfactory agreement is shown. It is concluded that there are various mechanisms of noise generation in the considered jet.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266946","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
Interference of Echo Signals from Spherical Scatterers Located Near the Bottom 来自底部附近球形散射体的回波信号的干扰
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601444
N. S. Grigorieva, F. F. Legusha, K. S. Safronov
{"title":"Interference of Echo Signals from Spherical Scatterers Located Near the Bottom","authors":"N. S. Grigorieva,&nbsp;F. F. Legusha,&nbsp;K. S. Safronov","doi":"10.1134/S1063771024601444","DOIUrl":"10.1134/S1063771024601444","url":null,"abstract":"<p><b>Abstract</b>—The influence of the bottom on an echo signal from spherical scatterers is studied. The bottom is modeled by a liquid absorbing half-space. The emitter/receiver is located in the aqueous half-space. The distance between the emitter/receiver and scatterer is assumed to be large compared to the acoustic wavelengths in the water and bottom. Numerical results are obtained for acoustically rigid spherical scatterers with the same radius. The interaction between scatterers is not taken into account. The echo signal from one sphere in a wide frequency range is calculated using the method proposed in papers by R.H. Hackman and G.S. Sammelmann, an important step in the implementation of which is calculation of the scattering coefficients of the sphere. To calculate them, the authors use asymptotic formulas obtained with the saddle point method. The resulting asymptotic expressions for the scattering coefficients of the sphere make it possible to significantly reduce the number of terms in the formula for the echo signal form function.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266936","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
Specific Features of Atmospheric Propagation of Nonlinear Acoustic Disturbances from Pulsed Sources 脉冲源非线性声扰动在大气中传播的具体特征
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601808
S. I. Kosyakov, S. N. Kulichkov, A. A. Mishenin, E. V. Golikova
{"title":"Specific Features of Atmospheric Propagation of Nonlinear Acoustic Disturbances from Pulsed Sources","authors":"S. I. Kosyakov,&nbsp;S. N. Kulichkov,&nbsp;A. A. Mishenin,&nbsp;E. V. Golikova","doi":"10.1134/S1063771024601808","DOIUrl":"10.1134/S1063771024601808","url":null,"abstract":"<div><p>The features of the propagation of nonlinear pulsed acoustic disturbances in the atmosphere are considered. Data are presented on the experimental observation of shock front formation and the transition of a shock wave into a low-intensity acoustic wave with transformation of the pulse shape and broadening of the front at distances greater than 1000 km under both spherical and cylindrical propagation conditions. The influence of Kelvin–Helmholtz instability during rapid gas compression on the formation of the shock front structure is discussed. Under atmospheric conditions, such instability significantly affects dissipative processes in the air and forms the front of a nonlinear wave.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266949","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
Holographic Method for Localizing an Underwater Noise Source in a Shallow Sea 浅海水下噪声源定位全息法
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601456
M. Yu. Glushchenko, V. M. Kuz’kin, Yu. V. Matvienko, S. A. Pereselkov, Yu. A. Khvorostov, S. A. Tkachenko
{"title":"Holographic Method for Localizing an Underwater Noise Source in a Shallow Sea","authors":"M. Yu. Glushchenko,&nbsp;V. M. Kuz’kin,&nbsp;Yu. V. Matvienko,&nbsp;S. A. Pereselkov,&nbsp;Yu. A. Khvorostov,&nbsp;S. A. Tkachenko","doi":"10.1134/S1063771024601456","DOIUrl":"10.1134/S1063771024601456","url":null,"abstract":"<div><p>The article presents the results of a high-frequency experiment to detect and determine the bearing of a small-sized underwater noise sound source, carried out in shallow waters of the Black Sea coast. Noise emission from the source was received by three single vector–scalar receivers located at the bottom. Holographic processing was used to detect and determine the bearing of a moving underwater source against a background of heavy shipping in the water area of the experiment. Estimates of the input signal/noise ratio are given.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266941","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
Investigation of the Spatial Distribution of Deformations in Quartz Piezo Elements by the X-Ray Topography Method 用 X 射线地形图法研究石英压电元件变形的空间分布
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771024601420
E. S. Ibragimov, F. S. Pilyak, A. G. Kulikov, N. V. Marchenkov, Y. V. Pisarevsky, A. A. Kaloyan, Y. A. Pershin, Y. A. Glazunova, S. A. Demin, A. S. Yuzhalkin, S. S. Pashkov, G. N. Cherpukhina
{"title":"Investigation of the Spatial Distribution of Deformations in Quartz Piezo Elements by the X-Ray Topography Method","authors":"E. S. Ibragimov,&nbsp;F. S. Pilyak,&nbsp;A. G. Kulikov,&nbsp;N. V. Marchenkov,&nbsp;Y. V. Pisarevsky,&nbsp;A. A. Kaloyan,&nbsp;Y. A. Pershin,&nbsp;Y. A. Glazunova,&nbsp;S. A. Demin,&nbsp;A. S. Yuzhalkin,&nbsp;S. S. Pashkov,&nbsp;G. N. Cherpukhina","doi":"10.1134/S1063771024601420","DOIUrl":"10.1134/S1063771024601420","url":null,"abstract":"<p>Using X-ray topography, the distributions of deformations in the volume of two types of AT-cut quartz resonators of different sizes were obtained on laboratory and synchrotron X-ray sources. The comparison of X-ray topography data and the amplitude–frequency characteristics of the resonators was used to establish a correlation between the deformation patterns and the features of oscillatory processes for the operating modes and their harmonics, as well as for parasitic modes. A connection between vibrations at parasitic modes and their harmonics, which manifest themselves in an amplitude inhomogeneity, and the topology of the resonators has been found. The applied significance of the obtained results for the development and optimization of new designs of piezoelectric elements and the development of their manufacturing technology is pointed out.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266945","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
Theoretical and Experimental Study of Diffraction by a Thin Cone 薄锥体衍射的理论与实验研究
IF 0.9 4区 物理与天体物理
Acoustical Physics Pub Date : 2024-09-18 DOI: 10.1134/S1063771023600754
A. Yu. Laptev, A. I. Korol’kov, A. V. Shanin
{"title":"Theoretical and Experimental Study of Diffraction by a Thin Cone","authors":"A. Yu. Laptev,&nbsp;A. I. Korol’kov,&nbsp;A. V. Shanin","doi":"10.1134/S1063771023600754","DOIUrl":"10.1134/S1063771023600754","url":null,"abstract":"<p>The problem of diffraction of ultrasonic waves by a sharp-angled rigid cone is studied. In the framework of the parabolic equation method, an analytical solution of the problem with an arbitrarily located point source is constructed. Namely, the problem is reduced to the Volterra boundary integral equation, which can be solved using the Fourier transform. An experimental measurement of the diffracted field is performed. The experiment is based on the M-sequence method adapted for narrowband sound sources. The experimental and theoretical results are compared.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266937","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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