Acoustical Physics最新文献_第5页

Studying the Frequency Range of Operation of a Piezoelectric Transducer of an Acousto-Optic Filter by Electric and Optical Methods 用电气和光学方法研究声光滤波器压电传感器的工作频率范围

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-07-15 DOI: 10.1134/S1063771023601218

N. V. Polikarpova, V. E. Pozhar

引用次数: 0

Compensation for Aberrations When Focusing Ultrasound Through the Skull Based on CT and MRI Data 基于 CT 和 MRI 数据的颅骨超声聚焦畸变补偿技术

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-07-15 DOI: 10.1134/S1063771024601651

D. D. Chupova, P. B. Rosnitskiy, O. V. Solontsov, L. R. Gavrilov, V. E. Sinitsyn, E. A. Mershina, O. A. Sapozhnikov, V. A. Khokhlova

{"title":"Compensation for Aberrations When Focusing Ultrasound Through the Skull Based on CT and MRI Data","authors":"D. D. Chupova, P. B. Rosnitskiy, O. V. Solontsov, L. R. Gavrilov, V. E. Sinitsyn, E. A. Mershina, O. A. Sapozhnikov, V. A. Khokhlova","doi":"10.1134/S1063771024601651","DOIUrl":"10.1134/S1063771024601651","url":null,"abstract":"<div><p>The study compares the capabilities of using 3D acoustic models of the human head, constructed using magnetic resonance imaging (MRI) and computed tomography (CT) data, to simulate ultrasound beam focusing when passing through skull bones and to compensate for aberrations caused by them. A CT and MRI dataset from one patient was considered. The MRI data were used to reconstruct segments of the human head (skin, skull, and brain) that were homogeneous in their internal structure. The most realistic CT model took into account the internal inhomogeneities of the skull bones and soft tissues. Field simulations and compensation for aberrations were performed using the Rayleigh integral and pseudospectral method for solving the wave equation in an inhomogeneous medium, implemented in the k-Wave software package. The transducer was considered to be a fully populated 256-element phased array with a frequency of 1 MHz and radius of curvature and an aperture of 200 mm. It was shown that when aberrations were compensated using an inhomogeneous CT model and a homogeneous MRI model, the pressure amplitude at the focus and focusing efficiency were different by less than 10%. Thus, a homogeneous MRI model can be used for preoperative assessment of the feasibility of transcranial ultrasound therapy. During therapy, it is preferable to take into account the internal structure of the skull bones based on CT data.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141720332","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

An Analytical Ocean Propagation Model using Piecewise Linear Sound Speed Profile 利用分段线性声速剖面的海洋传播分析模型

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-07-15 DOI: 10.1134/S1063771022100074

A. D. Chowdhury, S. K. Bhattacharya, C. P. Vendhan

{"title":"An Analytical Ocean Propagation Model using Piecewise Linear Sound Speed Profile","authors":"A. D. Chowdhury, S. K. Bhattacharya, C. P. Vendhan","doi":"10.1134/S1063771022100074","DOIUrl":"10.1134/S1063771022100074","url":null,"abstract":"<p>The normal mode method is widely employed for addressing depth-dependent acoustic wave propagation, with its accuracy contingent upon the precision of the propagating wavenumbers and depth mode shapes. Typically, finite-difference and finite-element methods are utilized for such solutions. Recently, a new approach has been proposed for heterogeneous depth-dependent waveguides, utilizing the classical Rayleigh–Ritz (RR) method. This method demonstrates high accuracy from low-frequency to high-frequency ranges. However, the matrices involved for solving the eigenvalue problems necessitate numerical integrations for evaluating each element, resulting in increased computational costs. To mitigate this, a similar method (RRF) is proposed, where sound speed profiles are expressed as a sum of Fourier series. This allows for the analytical computation of each entry of the RR matrices but compromises the accuracy of the wavenumbers. This paper presents a novel technique aimed at enhancing the precision of determining wavenumbers and mode shapes, while simultaneously minimizing the computational effort without compromising the accuracy. The method involves discretizing sound speed profiles using piecewise linear functions and deriving closed-form solutions for RR matrix elements, while also accounting for sound speed attenuation. Various examples are examined to evaluate the proposed method, demonstrating its capability to compute propagating radial wavenumbers with significantly improved accuracy and reduced computational cost, often achieving improvements of one or two orders of magnitude. Additionally, comparisons of transmission losses at fixed depth indicate accuracy comparable to existing solutions, without any noticeable visual discrepancies.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141720337","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

Use of Longitudinal Critically Refracted Waves to Determine Residual and Temperature Stresses in Rails 利用纵向临界折射波确定钢轨中的残余应力和温度应力

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-05-07 DOI: 10.1134/S1063771023600365

K. V. Kurashkin, A. G. Kirillov, A. V. Gonchar

{"title":"Use of Longitudinal Critically Refracted Waves to Determine Residual and Temperature Stresses in Rails","authors":"K. V. Kurashkin, A. G. Kirillov, A. V. Gonchar","doi":"10.1134/S1063771023600365","DOIUrl":"10.1134/S1063771023600365","url":null,"abstract":"<div><p>The possibility of using longitudinal critically refracted waves for acoustic strain gauging of longitudinal residual and temperature stresses in rails is studied. The influence of stress and temperature on the propagation velocity of elastic waves in rail steel is analyzed theoretically. An algorithm is presented for determining longitudinal stress in a rail by measuring the propagation time of longitudinal critically refracted waves. The operational principle is described, and the main parameters of an acoustic strain gauge device are presented, in which a differential scheme for measuring the propagation time of longitudinal critically refracted waves is implemented. Longitudinal critically refracted waves that propagate along a rail are emitted and received from the rolling surface of a rail head using contact piezoelectric transducers fixed on the polymethylmethacrylate wedges. The results of acoustomechanical and temperature tests are presented. The measurement errors are calculated. The results of determining the level of residual welding stresses in the head of a new rail are presented. The experimental results are compared with theoretical estimates of the stresses that arise in a rail under the influence of temperature, as well as with available data in the literature on residual stresses in rails.</p></div>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886568","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

Adult Speech in Different Emotional States: Temporal and Spectral Features 不同情绪状态下的成人语音：时间和频谱特征

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-05-07 DOI: 10.1134/S1063771023601127

A. V. Kurazhova

{"title":"Adult Speech in Different Emotional States: Temporal and Spectral Features","authors":"A. V. Kurazhova","doi":"10.1134/S1063771023601127","DOIUrl":"10.1134/S1063771023601127","url":null,"abstract":"<p>The aim of the study is to determine individual features of adult speech in different emotional states. The acoustic speech characteristics of 12 adult native Russian speakers were studied. The speech of informants uttering meaningless phrase in different emotional states was audio recorded: joy, anger, sadness, fear, and neutral. The temporal and spectral characteristics of speech were analyzed in the Cool Edit Pro sound editor. The maximum pitch range in male speech is revealed in phrases uttered in a neutral state and a state of joy; the minimum, in a state of sadness. For female speech, the maximum pitch range is in a state of joy and in a state of anger; the minimum, in a state of sadness and in a neutral state. The pitch range in female speech is larger than that in male speech. For seven informants, it was shown that the duration of utterances in a state of sadness was longer compared to other states, and in a state of joy, on the contrary, it was minimal. Both male and female utterances in a state of joy were characterized by maximum pitch range values; conversely, in a state of sadness, by minmum values. Pauses between words in utterances in a state of sadness were detected in both men and women. Thus, differences in the temporal and spectral characteristics of utterances in different emotional states are revealed. The individual features of the manifestation of the emotional state in the speech of adults are determined.</p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883513","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

Four-Channel Active Noise Control Modeling and Offline Simulation for Electric Bus Sound Quality Based on Two FxLMS Algorithms 基于两种 FxLMS 算法的电动巴士声品质四通道主动噪声控制建模和离线仿真

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-05-07 DOI: 10.1134/S1063771022600450

E. L. Zhang, Z. L. Peng, Z. J. Li, Y. B. Lin, J. M. Zhuo

{"title":"Four-Channel Active Noise Control Modeling and Offline Simulation for Electric Bus Sound Quality Based on Two FxLMS Algorithms","authors":"E. L. Zhang, Z. L. Peng, Z. J. Li, Y. B. Lin, J. M. Zhuo","doi":"10.1134/S1063771022600450","DOIUrl":"10.1134/S1063771022600450","url":null,"abstract":"<p>Aiming at the consensus problem of slow convergence for the active noise control (ANC) model based on standard FxLMS algorithm that leads to performance degradation, this paper takes the error signal and its variation as the inputs of fuzzy logic control, and proposes an improved FxLMS algorithm by fuzzy control mechanism with two-input-two-output TSK fuzzy rules (TSK-FxLMS); In addition, the four-channel ANC models based on standard FxLMS and TSK-FxLMS are constructed using the noise signals from four measuring points inside an electric bus under uniform and variable speed conditions, respectively. Ultimately, the offline simulation and acoustic parameter calculation results indicate that the A-weighted sound pressure level (ASPL) and loudness of the two FxLMS models within the low and middle frequencies are significantly reduced, whereas the TSK-FxLMS model has faster convergence rate, higher average reduction percentage of ASPL and loudness, which proves that the established four-channel TSK-FxLMS model has a better sound quality improvement effect than the standard FxLMS<i>.</i></p>","PeriodicalId":455,"journal":{"name":"Acoustical Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883792","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

Correlation Measurements of Thermal Acoustic Radiation Using a Sensor Array 使用传感器阵列对热声辐射进行相关测量

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-05-07 DOI: 10.1134/S1063771023601425

A. A. Anosov, N. V. Granovsky, R. V. Belyaev, A. V. Erofeev, A. G. Sanin, A. D. Mansfeld

引用次数: 0

The Sound Source Location Based on Phase Conjugation and Acoustic Superlens 基于相位共轭和超透镜的声源定位

IF 0.9 4区物理与天体物理

Acoustical Physics Pub Date : 2024-05-07 DOI: 10.1134/S1063771023600213

S. Liu, M. Li, R. Zhao

引用次数: 0

Monitoring the Internal Temperature of Active Elements of High-Power Lasers Using Ultrasonic Probing 利用超声波探测技术监测大功率激光器有源元件的内部温度