The Journal of the Acoustical Society of America最新文献_第7页

Enhancing heat-driven acoustic characteristics of standing wave thermoacoustic engines by using corrugated stack 利用波纹堆栈增强驻波热声发动机的热驱动声学特性

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0023543

Lixian Guo, Dan Zhao

{"title":"Enhancing heat-driven acoustic characteristics of standing wave thermoacoustic engines by using corrugated stack","authors":"Lixian Guo, Dan Zhao","doi":"10.1121/10.0023543","DOIUrl":"https://doi.org/10.1121/10.0023543","url":null,"abstract":"The present work considers the heat-driven acoustic characteristics and dynamic thermal-fluid flow fields of a standing-wave thermoacoustic engine (SWTAE) by using sinusoidally shaped corrugated stack surfaces. 3-D numerical SWTAE models are developed and validated, aiming to examine the heat-driven acoustic effects caused by different corrugation amplitudes and wave-lengths of the sinusoidal stack surface. The results demonstrate that corrugated-shaped stack channels increase the contact area of the working gas in the stack area, and the thermos-acoustic conversion is more amplified. Compared to the SWTAE with uniform-shaped stack, the corrugated-shaped stack exhibit enhanced acoustic power output while maintaining a constant acoustic oscillation frequency. With the corrugation peak and wave-length of the sinusoidal stack are 2 and 0.2 mm, respectively, the amplitude and acoustic power of the acoustic pressure oscillations increase by 10.12% and 17.31%, respectively, in comparison with that of the conventional SWTAE. However, when the corrugation peak exceeds 0.4 mm, stronger nonlinear acoustics and flow effects are observed in the stack channels, leading to a reduction in the heat-driven acoustic power output, and thermo-acoustics energy conversion efficiency. The developed model highlights the effects of the corrugated-shaped stack on enhancing acoustic power output and thermo-acoustic conversion efficiency.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"161 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The integration of metamaterials into building elements 超材料与建筑构件的融合

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0023255

Andrew Hall, Vladislav Sorokin, E. Calius, G. Schmid, George Dodd

{"title":"The integration of metamaterials into building elements","authors":"Andrew Hall, Vladislav Sorokin, E. Calius, G. Schmid, George Dodd","doi":"10.1121/10.0023255","DOIUrl":"https://doi.org/10.1121/10.0023255","url":null,"abstract":"The building industry continues to rely on homogeneous materials for acoustic insulation despite the progress of research into acoustic metamaterials. With the inevitable densification of housing, the severity of noise pollution within residential living environments is escalating. While the insulation of high-frequency audible sound through building elements is often relatively good between 1 and 5 kHz, the overall acoustic transmission loss performance is often significantly limited by two specific frequency regions. The mass air mass resonance band, and the coincidence band. We present the results of an investigation into the use of metastructures and metasurfaces to improve transmission loss in these frequency regions with a focus on scalable implementation. These metastructures are metamaterial systems constructed from impedance change elements, surface variations and vibroacoustic resonant elements. The performance of selected systems from this research are presented. Experimental and modeling results are in good qualitative agreement and promising diffuse-field testing results indicate significant attenuation within the targeted band regions. The merits of each technique are analysed, and results indicate which methods are most effective at either mitigating or shifting the regions of poor transmission loss outside of the most important part of the audible frequency region.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toward translating novel imaging biomarkers from preclinical to clinical settings 努力将新型成像生物标记物从临床前应用转化为临床应用

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0023182

Misun Hwang

引用次数: 0

On the utilisation of the coupled-oscillator approach as a surrogate model for sound propagation in the vicinity of bubble groups 利用耦合振荡器方法作为气泡群附近声音传播的替代模型

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0022948

Andrew Ooi, Shuang J. Zhu, Alex Skvortsov, R. Manasseh

{"title":"On the utilisation of the coupled-oscillator approach as a surrogate model for sound propagation in the vicinity of bubble groups","authors":"Andrew Ooi, Shuang J. Zhu, Alex Skvortsov, R. Manasseh","doi":"10.1121/10.0022948","DOIUrl":"https://doi.org/10.1121/10.0022948","url":null,"abstract":"The presence of bubble curtains have been shown to reduce the level of underwater noise propagation. This is due to the change in density and acoustic-impedance between the group of bubbles and the water. In addition, sound waves can be absorbed and scattered when they interact with bubble curtains. In this paper, it is shown that a mathematical model based on the discrete bubble model (DBM) and utilising the self-consistent coupled-oscillator theory is able to correctly predict the bubble collective resonance frequencies of 1D line, 2-D planar, and 3-D complex bubble cloud configurations. This framework can also accommodate polydisperse-sized bubbles. We use the DBM and conduct modal analysis on common 2-D and 3-D bubble curtain configurations and show that the fundamental modes in both configurations dominated the vibration of bubble curtains when subjected to an external acoustic source. In addition, it is demonstrated that the performance of the bubble curtain is most affected by the changes in the bubble size whereas the variations in inter-bubble spacing had no significant influence.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing hearing research with the NAL ecologically momentary assessment platform for real-world insights 利用 NAL 生态瞬间评估平台推进听力研究，深入了解真实世界

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0023293

N. Chong-White, Joseph Tagudin, Jorge Mejia

{"title":"Advancing hearing research with the NAL ecologically momentary assessment platform for real-world insights","authors":"N. Chong-White, Joseph Tagudin, Jorge Mejia","doi":"10.1121/10.0023293","DOIUrl":"https://doi.org/10.1121/10.0023293","url":null,"abstract":"Ecological Momentary Assessment (EMA) is an invaluable tool for assessing people's behaviours and experiences in their natural surroundings. We have developed a smartphone-based EMA tool, called NEMA, that has contributed to over 10 research studies by providing meaningful real-world insights into how individuals with hearing loss interact with various hearing device technologies. By providing real-world perspectives that complement traditional lab-based tests, NEMA offers a more comprehensive understanding of everyday hearing and communication challenges. Its advanced features include cloud-connectivity, customisable surveys, cross-device acoustic feature measurements from the environment, and a back-end platform enabling real-time data monitoring and visualization. To derive vital insights from this rich data stream, advanced analytical methodologies are applied. However, there exist limitations with smartphone-based EMAs that can influence their overall effectiveness. We identify these constraints and discuss strategies to alleviate participant burden and increase task relevance. These initiatives aim to enhance compliance and diversify data collected. Current work involves integrating smartwatches and additional sensor technology into our next generation NEMA platform. This progression aims to facilitate a more comprehensive capture of diverse data sets, ultimately leading to a deeper understanding of individual auditory experiences.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New road surface noise corrections for New Zealand 新西兰新的路面噪声修正

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0022813

R. Jackett, John Bull, S. Chiles, Rob Wareing, George Bell

{"title":"New road surface noise corrections for New Zealand","authors":"R. Jackett, John Bull, S. Chiles, Rob Wareing, George Bell","doi":"10.1121/10.0022813","DOIUrl":"https://doi.org/10.1121/10.0022813","url":null,"abstract":"New Zealand’s transport agency has developed a close-proximity (CPX) noise trailer and primarily operates it as a road surface research tool. Early CPX survey data revealed very high longitudinal variability in the performance of porous asphalts on the highway network (±5 dB). Further study and optimization of porous asphalt mixes has resulted in high-performance low-noise surfaces that are reliably 5 dB quieter than standard NZ porous asphalt. The new surfaces and improved surface data inspired a recalibration of NZ’s implementation of the CRTN road-traffic noise model, for which a novel method based on CPX survey data and individual vehicle pass-by measurements was employed. The relationship between CPX and wayside levels was more complex than anticipated; CPX measurements did not capture all the surface attributes/interactions contributing to the wayside level (such as porosity, directivity). The methodology proved successful and a new table of surface corrections has been published, embodying the recalibration of CRTN for NZ in 2023. CRTN predictions using the new corrections have performed well when evaluated against independent road-traffic noise monitoring data from NZ highways.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Features and limitations of the Weston α parameter as a descriptor of seafloor bottom loss 威斯顿 α 参数作为海底损失描述符的特点和局限性

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0023154

Adrian D. Jones

{"title":"Features and limitations of the Weston α parameter as a descriptor of seafloor bottom loss","authors":"Adrian D. Jones","doi":"10.1121/10.0023154","DOIUrl":"https://doi.org/10.1121/10.0023154","url":null,"abstract":"It is straightforward to prove that, for very small seafloor grazing angles, the Weston α parameter [Weston, J. Sound Vib. 18, 271–287, 1971] provides a reasonable estimate of the slope of bottom loss in dB versus grazing angle. However, for some circumstances, the descriptions of bottom loss versus grazing angle based on the Weston α parameter are valid over a considerable span of grazing angles and to large loss values. By studying the seafloor reflection in terms of impedance, and as linked to the geoacoustic parameters, greater knowledge of the features and limitations of the Weston α parameter as a descriptor of seafloor bottom loss has been obtained. This paper covers the theory, applicable to a variety of seafloor types, each of a uniform half-space. Seafloors considered include those with either fast or slow compressional speed. For fast seafloors, shear speed is considered as one of less than, near to, or greater than the water sound speed. The effects of each of compressional and shear absorption in the seafloor are considered. Numerous sample plots of bottom loss versus grazing angle are used to demonstrate the accuracy of the analysis.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimating mixed gas fluxes with geochemically informed broadband acoustic methods: What the flux? 利用地球化学宽带声学方法估算混合气体通量：通量是多少？

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0022906

Y. Ladroit, Sally Watson, Sarah Seabrook, E. Weidner, Thomas C. Weber, Amy Nau, Vanessa Lucieer, G. Lamarche

{"title":"Estimating mixed gas fluxes with geochemically informed broadband acoustic methods: What the flux?","authors":"Y. Ladroit, Sally Watson, Sarah Seabrook, E. Weidner, Thomas C. Weber, Amy Nau, Vanessa Lucieer, G. Lamarche","doi":"10.1121/10.0022906","DOIUrl":"https://doi.org/10.1121/10.0022906","url":null,"abstract":"Over the past few years, improvements in broadband split-beam echosounders have made it possible to obtain precise measurements of bubble-size distribution and density of gas seeps. Here, we model acoustic volume backscattering of a group of bubbles with a multi-modal size distribution that we matched to real-time acoustical measurement over a gas seep. The results are profiles of bubble size distribution descriptors (e.g., distribution type and parameters), density and ratio of the various components (i.e., gas composition). To test the ability of this methodology to differentiate gas flux composition and estimate gas flux magnitudes, we applied it in a semi-automated fashion on broadband data (12 to 250 kHz) acquired in the Bay of Plenty (NZ) over mixed gas seeps (e.g., CO2, CH4). Model outputs were compared with real-time dissolved gas measurements to constrain gas composition, magnitude, and ground-truth methodologies. The method can be applied to a variety of marine seeps to produce regional flux estimations, improving oceanic carbon budgets and our understanding of downstream feedbacks, such as localized deoxygenation or ocean acidification.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating biophilic design and adaptive acoustic comfort in office spaces in the existence of indoor greenery, operable window, and road traffic noise 研究室内绿化、可开启窗户和道路交通噪音条件下办公空间的亲生物设计和适应性声学舒适度

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0022816

Merve Esmebasi, Siu-Kit Lau

{"title":"Investigating biophilic design and adaptive acoustic comfort in office spaces in the existence of indoor greenery, operable window, and road traffic noise","authors":"Merve Esmebasi, Siu-Kit Lau","doi":"10.1121/10.0022816","DOIUrl":"https://doi.org/10.1121/10.0022816","url":null,"abstract":"This study examines how indoor greenery and operable windows influence the annoyance caused by road traffic noise in office spaces. While existing studies have explored how urban landscapes can reduce noise annoyance in residential areas, there is a gap in understanding the effects of indoor greenery in office environments. The present study utilized a structural equation model to analyze the cause-effect relationships concerning noise perception. Thirty-two combinations of greenery levels, window conditions, and traffic noise across four different sound pressure levels (50dBA–65 dBA) were evaluated. To explain noise perception, the model considered perceptual attributes like pleasantness, eventfulness, appropriateness, preference, and visual aesthetics. The results indicated that traffic noise level affects visual perception, and there is a two-way interaction between auditory and visual perceptions. These findings advocate for incorporating biophilic design to create visually appealing and acoustically pleasant office spaces. Moreover, the study emphasized the positive influence of open windows on the perceived appropriateness of traffic noise resulting in less annoyance. Overall, this research contributes valuable insights to discussions on creating adaptive acoustic comfort in naturally ventilated spaces and enhancing visual aesthetics through biophilic design to mitigate noise annoyance in office environments effectively.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"245 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Noninvasive measurement of lung elastic properties 无创测量肺弹性特性

The Journal of the Acoustical Society of America Pub Date : 2023-10-01 DOI: 10.1121/10.0023341

Xiaoming Zhang

{"title":"Noninvasive measurement of lung elastic properties","authors":"Xiaoming Zhang","doi":"10.1121/10.0023341","DOIUrl":"https://doi.org/10.1121/10.0023341","url":null,"abstract":"Many lung diseases are associated with dramatic changes in mechanical properties of the lung. Chest radiographs and computed tomography (CT) are the most common clinical methods for evaluating lung disease, but they are expensive, use radiation, and do not measure lung stiffness. Shear wave elastography (SWE) uses ultrasound radiation force (URF) to generate wave propagation in the tissue. However, URF should not be applied to the lung, because there are air and blood in the alveoli. Relatively high-intensity ultrasound can cause alveolar hemorrhage and lung injury. We have developed a noninvasive, and clinically feasible technology, lung ultrasound surface wave elastography (LUSWE), that is capable of measuring lung elastic properties with speed and accuracy. LUSWE uses a handheld shaker to generate a local small harmonic vibration on the chest surface. The resulting wave propagates through the intercostal muscle and propagates on the lung. The surface wave speed is noninvasively measured using an ultrasound technique. LUSWE is safe because diagnostic ultrasound is only used to detect the wave propagation along the lung duo to mechanical wave generation on the chest. LUSWE may be used to assess multiple lung disorders such as lung fibrosis or lung edema.","PeriodicalId":256727,"journal":{"name":"The Journal of the Acoustical Society of America","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0