Journal of the Acoustical Society of America最新文献_第5页

Evaluating effects of microstructure and porosity on elastic anisotropy of additively manufactured materials using ultrasonic techniques.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036214

Daniel Herburger, Jin-Yeon Kim, Nicholas Lark, Laurence Jacobs

{"title":"Evaluating effects of microstructure and porosity on elastic anisotropy of additively manufactured materials using ultrasonic techniques.","authors":"Daniel Herburger, Jin-Yeon Kim, Nicholas Lark, Laurence Jacobs","doi":"10.1121/10.0036214","DOIUrl":"https://doi.org/10.1121/10.0036214","url":null,"abstract":"The potential of additive manufacturing is often limited by qualification issues, particularly due to process defects such as lack-of-fusion porosity and highly anisotropic elastic properties. This research demonstrates the ability of ultrasonic measurement techniques to assess these elastic properties, process defects, and microstructural characteristics. Ultrasonic velocity measurements are used to evaluate the impact of various process parameters and heat treatments (HTs) on the elastic anisotropy of laser powder bed fusion 316 L stainless steel. These variations are linked to material characteristics through microstructural analysis and porosity measurements. By characterizing the orthotropic elastic behavior, this study quantifies the errors that can arise in the design and analysis of additively manufactured parts by assuming isotropic or transversely isotropic elastic properties. Furthermore, HTs are used to isolate and quantify the individual contributions of process defects such as lack-of-fusion defects and microstructural factors-including crystallographic texture and grain morphology-to elastic anisotropy. The findings of this research highlight the potential of ultrasonic techniques for monitoring and qualifying additively manufactured materials.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"2018-2028"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143692513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Mechanical impedance of the skin-covered human head at different stimulation positions, static forces, and interface areas.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036150

Sudeep Surendran, Stefan Stenfelt

{"title":"Mechanical impedance of the skin-covered human head at different stimulation positions, static forces, and interface areas.","authors":"Sudeep Surendran, Stefan Stenfelt","doi":"10.1121/10.0036150","DOIUrl":"https://doi.org/10.1121/10.0036150","url":null,"abstract":"Bone conduction (BC) transducers applied to skin-covered areas of the head differ in their positioning, contact area, and static force, all of which influence output characteristics. This study assesses the mechanical impedance of the skin-covered head under varying conditions. Measurements were conducted on 30 participants at 3 positions, earfront, forehead, and mastoid, using circular interfaces with diameters of 10, 15, and 25 mm, and 6 static forces ranging from 0.5 to 7 N. Results showed that mechanical impedance was stiffness-controlled below the resonance frequency and mass-controlled above it. Low-frequency impedance depended on position and static force, with the forehead producing the highest impedance magnitude and the earfront producing the lowest impedance magnitude. At high frequencies, impedance across positions was similar, except for the mastoid with 25 mm interface. Impedance magnitude increased with interface area below 350 Hz and above resonance frequency. These findings highlight an impedance mismatch between standard artificial mastoids and human mastoids, potentially leading to inaccurate force estimations in BC devices. Additionally, three-element and six-element lumped mechanical models for the earfront, forehead, and mastoid were developed, with parameter values as function of contact area and static force.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"1821-1841"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143649396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Successive weight update sparse Bayesian learning based receiver for multiuser underwater acoustic communications.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036141

Xueli Sheng, Zheng Wu, Li Wei, Guangjun Zhu, Xiao Han, Yanan Tian

{"title":"Successive weight update sparse Bayesian learning based receiver for multiuser underwater acoustic communications.","authors":"Xueli Sheng, Zheng Wu, Li Wei, Guangjun Zhu, Xiao Han, Yanan Tian","doi":"10.1121/10.0036141","DOIUrl":"https://doi.org/10.1121/10.0036141","url":null,"abstract":"This paper proposes a single-carrier multiuser (MU) receiver for MU underwater acoustic communications with time-varying and strong multiple-access interference. The receiver integrates soft successive interference cancellation, successive weight update sparse Bayesian learning channel estimation based on approximate message passing (SWUSBL-AMP), and an improved channel update decision. After the first iteration, the improved channel update decision first estimates the channel of each subblock using the interference-cancelled signals from the previous iteration, avoiding the mismatch of time-varying channels. By running the factor graph serially, the SWUSBL-AMP channel estimation algorithm enables the factor graph of the current subblock to utilize the messages updated by the previous subblock, and update the correlation weighting factors, to accelerate the convergence speed and further improve the channel estimation accuracy. Using the experimental data collected in the South China Sea in 2023 for processing, the results demonstrate that the bit error rate performance of the proposed receiver is better than that of other receivers of the same type. Moreover, we also verify the complexity of the proposed SWUSBL-AMP algorithm can be nearly an order of magnitude lower than that of other algorithms.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"1807-1820"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143649399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Statistical wave field theory: Special polyhedra.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036254

Roland Badeau

{"title":"Statistical wave field theory: Special polyhedra.","authors":"Roland Badeau","doi":"10.1121/10.0036254","DOIUrl":"https://doi.org/10.1121/10.0036254","url":null,"abstract":"The statistical wave field theory establishes mathematically the statistical laws of the solutions to the wave equation in a bounded volume. It provides the closed-form expression of the power distribution and the correlations of the wave field jointly over time, frequency, and space, in terms of the geometry and the specific admittance of the boundary surface. In a recent paper, we presented a mathematical approach to this theory based on the Sturm-Liouville theory and the theory of dynamical billiards. We focused on mixing billiards that generate an isotropic wave field, and we retrieved the well-known statistical properties of reverberation in room acoustics. In the present paper, we introduce a simpler geometric approach, dedicated to a particular class of non-ergodic billiards. Though limited to only a few polyhedra, this approach offers a precious insight into various aspects of the theory, including the first examples of anisotropic wave fields, whose statistical properties are related to mathematical crystallography. We also show that the formulas that we obtain in this anisotropic case are closely related to those of the mixing case, albeit based on a different mathematical approach.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"2263-2278"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Activity-based acoustic situations in primary schools: Analyzing classroom noise and listening effort.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036129

Julia Seitz, Janina Fels

{"title":"Activity-based acoustic situations in primary schools: Analyzing classroom noise and listening effort.","authors":"Julia Seitz, Janina Fels","doi":"10.1121/10.0036129","DOIUrl":"https://doi.org/10.1121/10.0036129","url":null,"abstract":"This study introduces the concept of activity-based acoustic situations in primary schools, which describe the everyday sound environment in classrooms. During a series of noise measurements in seven German primary schools, differences in noise parameters and subjective listening effort, as assessed by questionnaires, were investigated across the activity-based acoustic situations. Classroom noise was analyzed for sound pressure level (SPL), A-weighted SPL, loudness, and sharpness. The results showed statistically significant differences in average loudness and A-weighted SPL between the activity-based acoustic situations, with silent work yielding 55.48 dB(A), student-teacher interaction 65.13 dB(A), group work 67.44 dB(A), and breakfast break in the classroom 69.34 dB(A). All loudness parameters, SPL, A-weighted SPL, and loudness, showed higher values for first grade than for fourth grade supporting that noise levels decrease with increasing age. Subjective listening effort, as assessed by questionnaires, did not differ significantly between activity-based acoustic situations. This suggests that the questionnaire may not have been suited to evaluate subjective listening effort for the age group investigated. The present study highlights the importance of activity-based assessment of classroom noise to better represent the classroom sound environment.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"1772-1783"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143625147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Sparse representation of speech using an atomic speech modela).

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036144

Fanhui Kong, Huali Zhou, Nengheng Zheng, Qinglin Meng

{"title":"Sparse representation of speech using an atomic speech modela).","authors":"Fanhui Kong, Huali Zhou, Nengheng Zheng, Qinglin Meng","doi":"10.1121/10.0036144","DOIUrl":"https://doi.org/10.1121/10.0036144","url":null,"abstract":"Speech perception has been extensively studied using degradation algorithms such as channel vocoding, mosaic speech, and pointillistic speech. Here, an \"atomic speech model\" is introduced to generate unique sparse time-frequency patterns. It processes speech signals using a bank of bandpass filters, undersamples the signals, and reproduces each sample using a Gaussian-enveloped tone (a Gabor atom). To examine atomic speech intelligibility, adaptive speech reception thresholds (SRTs) are measured as a function of atom rate in normal-hearing listeners, investigating the effects of spectral maxima, binaural integration, and single echo. Experiment 1 showed atomic speech with 4 spectral maxima out of 32 bands remained intelligible even at a low rate under 80 atoms per second. Experiment 2 showed that when atoms were nonoverlappingly assigned to both ears, the mean SRT increased (i.e., worsened) compared to the monaural condition, where all atoms were assigned to one ear. Individual data revealed that a few listeners could integrate information from both ears, performing comparably to the monaural condition. Experiment 3 indicated higher mean SRT with a 100 ms echo delay than that with shorter delays (e.g., 50, 25, and 0 ms). These findings demonstrate the utility of the atomic speech model for investigating speech perception and its underlying mechanisms.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"1899-1911"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Manipulation of an acoustically levitated object using externally excited standing waves. 利用外部激励驻波操纵声学悬浮物体。

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036148

M Akbarzadeh, S Oberst, B Halkon

{"title":"Manipulation of an acoustically levitated object using externally excited standing waves.","authors":"M Akbarzadeh, S Oberst, B Halkon","doi":"10.1121/10.0036148","DOIUrl":"https://doi.org/10.1121/10.0036148","url":null,"abstract":"Ultrasonic standing waves can be used to manipulate the position and control the movement of levitated objects through acoustic radiation forces. Within this context, the theory of the Gor'kov potential function and its acoustic contrast factor are revisited, considering the scenario of a harmonic disturbance to the standing wave and its influence on the levitated spherical object. This disturbance causes a levitated object-trapped within a standing, plane ultrasonic wave field in an ideal fluid-to undergo oscillations in sympathy with the resulting motion of the wave field. In this paper, we determine how the acoustic contrast factor depends on the properties of the object, the fluid and the external excitation, in combination. We show that positive, negative, and zero acoustic radiation forces can be achieved, causing the object to be pushed towards the nearest pressure or velocity node. We experimentally verify-through external excitation of an ultrasonic standing wave generator-that the disturbance vibration frequency and amplitude are transmitted to the object. The dependence on the external excitation amplitude and force reversal are novel features that can be employed in acoustic manipulation for non-contact dynamic characterization of small objects.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"1852-1861"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143657581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Acoustical aspects of the development of Greek theaters in the 4th century B.C.E.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036255

Jens Holger Rindel

{"title":"Acoustical aspects of the development of Greek theaters in the 4th century B.C.E.","authors":"Jens Holger Rindel","doi":"10.1121/10.0036255","DOIUrl":"https://doi.org/10.1121/10.0036255","url":null,"abstract":"In ancient Greece, the 4th century B.C.E. was a time of rapid development in arts, culture, science, politics, and theater architecture. The first part of this article describes the origin and use of the Greek theater building and its connection to the Dionysus cult and festivals with musical and drama competitions. Next, scientific context is discussed as a background regarding the highly skilled architects who designed these theaters. The 4th century B.C.E. is characterized by the blooming of the sciences, especially mathematics, strongly stimulated by Plato's Academy near Athens. The architecture of the theater changed within this century. While earlier theaters had mostly rectilinear seat-rows, symmetry and a stricter geometry started to characterize theater design. In this study, six theaters were selected for acoustical analysis: three of them with rectilinear shapes, and three of the well-known semicircular form. Acoustical analyses show that the archaeologically demonstrated shift in theater design from a simple rectilinear shape to the historically canonical semicircular shape was a way to increase theater capacity and at the same time improve the acoustics. Acoustical analyses reveal some of the design principles that can explain the excellent acoustics of these theaters and the applied knowledge of their designers.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"2042-2066"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143692445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The relationship between distortion product otoacoustic emissions and audiometric thresholds in the extended high-frequency range. 失真产物耳声发射与扩展高频范围听阈之间的关系。

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036143

Samantha N Hauser, Alexandra R Hustedt-Mai, Anna Wichlinski, Hari M Bharadwaj

{"title":"The relationship between distortion product otoacoustic emissions and audiometric thresholds in the extended high-frequency range.","authors":"Samantha N Hauser, Alexandra R Hustedt-Mai, Anna Wichlinski, Hari M Bharadwaj","doi":"10.1121/10.0036143","DOIUrl":"10.1121/10.0036143","url":null,"abstract":"Distortion product otoacoustic emissions (DPOAEs) and behavioral audiometry are routinely used for hearing screening and assessment. These measures provide related information about hearing status as both are sensitive to cochlear pathologies. However, DPOAE testing is quicker and does not require a behavioral response. Despite these practical advantages, DPOAE testing is often limited to screening only low- and mid-frequencies. Variation in ear canal acoustics across ears and probe placements has resulted in less reliable measurements of DPOAEs near 4 kHz and above where standing waves commonly occur. Stimulus calibration in forward pressure level and responses in emitted pressure level can reduce measurement variability. Using these calibrations, this study assessed the correlation between audiometry and DPOAEs in the extended high frequencies where stimulus calibrations and responses are most susceptible to the effect of standing waves. Behavioral thresholds and DPOAE amplitudes were negatively correlated, and DPOAE amplitudes in emitted pressure level accounted for twice as much variance as amplitudes in conventional sound pressure level units. Both measures were correlated with age. These data show that extended high-frequency DPOAEs are sensitive to differences in audiometric thresholds and highlight the need to consider calibration techniques in clinical and research applications of DPOAEs.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"1889-1898"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11925483/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143657585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Underwater vibro-acoustics analysis of plates with sharkskin inspired surface modifications.

IF 2.1 2区物理与天体物理

Journal of the Acoustical Society of America Pub Date : 2025-03-01 DOI: 10.1121/10.0036151

Aninda Pal, Ritwik Ghoshal, Ranadev Datta

{"title":"Underwater vibro-acoustics analysis of plates with sharkskin inspired surface modifications.","authors":"Aninda Pal, Ritwik Ghoshal, Ranadev Datta","doi":"10.1121/10.0036151","DOIUrl":"https://doi.org/10.1121/10.0036151","url":null,"abstract":"This paper investigates the vibro-acoustic response of a coupled fluid-loaded rectangular isotropic plate, incorporating point masses inspired by sharkskin biomimetic surface treatment. Previous studies examined changes in plate vibro-acoustic response induced by a hydrodynamic field or point mass loading separately. The research focuses on studying sound radiation characteristics of plates undergoing multimode transverse vibrations, emphasizing submerged plates with modified sharkskin wettability. A semi-analytical model considers the coupled effect of hydrodynamic added mass and denticle mass for surface modification. The sharkskin layer model employs the Dirac delta function to represent the array pattern, where small denticle mass is applied to upper and lower plate surfaces. Evaluation of hydrodynamic added mass involves analyzing fluid kinetic energy, eliminating singularity through a polar coordinate transformation, and using Rayleigh integration for analytical evaluation of underwater sound radiation characteristics. The proposed mathematical formulation is validated by comparing frequency responses and vibro-acoustic characteristics of bare plates (in vacuo and in water) with existing literature, showing good agreement. A comparative analysis contrasts vibro-acoustic features of plates resembling sharkskin with unmodified or bare plates, extensively examining the impact of surface modification across different boundary conditions, baseplate material, and denticle spacing. The proposed analytical solutions may aid in designing underwater devices for acoustic wave manipulation.","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"157 3","pages":"2206-2220"},"PeriodicalIF":2.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143719856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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