Applied Acoustics最新文献

{"title":"Apertured electrical coils for sound radiation reduction","authors":"Carlos García A.,&nbsp;Amine Benamar,&nbsp;Vincent Lanfranchi,&nbsp;Nicolas Dauchez","doi":"10.1016/j.apacoust.2025.111179","DOIUrl":"10.1016/j.apacoust.2025.111179","url":null,"abstract":"<div><div>Industrial coils, such as air-core dry-type reactors, are well known for emitting high-level low-frequency electromagnetic-induced noise. This type of noise generally results from Lorentz forces exciting the coil. In this study, we investigate the effects of introducing apertures into air-core dry-type reactors on the acoustic radiation and associated dynamic behaviors. A simple analytical model of a coil section is first presented to illustrate how porosity, i.e. the aperture size, changes the radiated acoustic pressure. This model shows the variations in pressure inside and outside the coil, as well as the overall dynamic behavior of the most radiating mode in thin shells, i.e. the “ring mode\". The transition from solid to apertured structures has interesting dynamical consequences: coupled structural modes detach and change the overall dynamics and acoustics, in ways that are not captured by the simplified model. We investigate these effects through a three-step simulation—electromagnetic, mechanical, and acoustic—which reveals that apertured coils exhibit notably lower acoustic radiation efficiency compared to solid structures, with a reduction of approximately 15 dB at 100 Hz. Thus, our findings offer useful considerations for the design and optimization of apertured coils to decrease acoustic noise generation.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111179"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694780","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}

{"title":"Topic modeling of inter-floor noise complaints in apartment buildings: Behavioural and contextual analysis","authors":"Geon-Hee Kim ,&nbsp;Sungchan Lee ,&nbsp;Sang Hee Park ,&nbsp;Joo-Young Hong","doi":"10.1016/j.apacoust.2025.111204","DOIUrl":"10.1016/j.apacoust.2025.111204","url":null,"abstract":"<div><div>Inter-floor noise is a main source of stress and conflict in apartment buildings, yet little is known about how complaints vary according to behavioural patterns, time of day, and social context. This study analyzed 119 real-world inter-floor noise complaints using a combination of Latent Dirichlet Allocation (LDA) topic modeling and Poisson regression. The objective was to examine the primary themes of complaints, how they evolve over time, and how social context influences the frequency of complaints. Through topic modeling, nine distinct complaint topics were identified. Common noise sources included footsteps, furniture movement, and children’s activities. As inter-floor noise exposure persisted, complaints shifted from general noise concerns to expressions of psychological distress and reports of direct confrontation, suggesting inter-floor noise functions as an environmental stressor with social and mental health implications. Poisson regression analysis revealed that households with children in affected units were less likely to file complaints, suggesting a greater tolerance. In contrast, the presence of children in noise-generating households did not affect the likelihood of receiving complaints. Additionally, complaints were more frequent at nighttime compared to during the daytime. These findings underscore the need for time-sensitive regulations, early-stage mediation, and socially informed noise management strategies.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111204"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797721","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}

{"title":"Minimum determinant estimate for source bearing estimation in shallow-water waveguides","authors":"Qian Ma ,&nbsp;Mingyang Li ,&nbsp;Chao Sun","doi":"10.1016/j.apacoust.2025.111211","DOIUrl":"10.1016/j.apacoust.2025.111211","url":null,"abstract":"<div><div>Most prevalent source bearing estimation methods are based on the plane-wave assumption, which might lead to biases in the estimates due to multimode propagation in waveguide channels, especially when the source is near the endfire direction of the sensor array. While the environment-dependent method, such as matched field processing (MFP), can provide unbiased estimates, it requires either a computationally expensive 3-D search over range, depth and bearing or prior knowledge of the source range and depth. The recently-developed subspace intersection method (SIM) circumvents these limitations by exploiting the alignment between the signal vector and the modal subspace, enabling accurate bearing estimation via a 1-D search. However, it requires prior knowledge of the number of sources. This work reformulates source bearing estimation as a matrix similarity measurement problem. It is demonstrated that the maximum likelihood estimate (MLE) for the source bearing can be derived by minimizing a tailored Euclidean distance between the sampled covariance matrix and the modal subspace projection matrix. Furthermore, a novel minimum determinant estimate (MDE) is proposed based on the Jensen-Bregman LogDet divergence, which minimizes the determinant of the sum of the data sampled covariance matrix and the modal subspace projection matrix. Numerical simulations in a shallow water waveguide demonstrate that the MDE achieves accurate bearing estimation of multiple sources without requiring information on the number of sources, and produces ambiguity surfaces with a clean background. The proposed method is also validated using experimental data from the SWellEx-96 trial.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111211"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840707","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}

{"title":"A multi-channel active road noise control system using incremental SVD based virtual references and local-clustered control strategy","authors":"Ziheng Xia,&nbsp;Yansong He,&nbsp;Zhifei Zhang,&nbsp;Hao Chen,&nbsp;Xiaoyu Fu","doi":"10.1016/j.apacoust.2025.111216","DOIUrl":"10.1016/j.apacoust.2025.111216","url":null,"abstract":"<div><div>Active road noise control (ARNC) systems use multiple acceleration signals from the chassis as the references to attenuate vehicle interior road noise. However, due to the coupling effect among the chassis structures, the predetermined reference signals cannot always ensure their independence and coherence to the interior noises. In addition, the computational complexity of the conventional centralized ARNC systems increase rapidly as the growth of the channels. To address the above issues, this study proposes a multi-channel ARNC system using virtual references and local-clustered control strategy. Firstly, a virtual reference method based on incremental singular value decomposition is developed to generate an orthogonal virtual reference set, which improves the system’s noise reduction performance. The conventional centralized system is then decomposed into two independent active headrest subsystems based on the local-clustered control strategy to reduce the computational complexity. Numerical simulations and on-board experiments are conducted to validate the effectiveness of the proposed ARNC system. The results demonstrate that the proposed system can effectively attenuate the interior road noises with lower computational effort compared to the conventional centralized ARNC system: when the vehicle is driving at the speed of 60 km/h, the overall noise reduction values improved by 1.5 dB(A), and when the vehicle is driving at the speed of 80 km/h, the values improved by 1.0 dB(A).</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111216"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840710","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}

{"title":"Proposed Welsh translations for soundscape attributes","authors":"Llewelyn Hopwood ,&nbsp;Guto Dafydd ,&nbsp;Jenna Turnbull ,&nbsp;Andrew Mitchell ,&nbsp;Tin Oberman ,&nbsp;Jian Kang ,&nbsp;Francesco Aletta","doi":"10.1016/j.apacoust.2025.111199","DOIUrl":"10.1016/j.apacoust.2025.111199","url":null,"abstract":"<div><div>ISO/TS 12913-2:2018 (Method A) proposes a standardized method for collecting data on soundscape perception via questionnaires that use eight perceptual attributes: Pleasant, Calm, Uneventful, Monotonous, Annoying, Chaotic, Eventful, Vibrant. The Soundscape Attributes Translation Project (SATP) seeks to provide translations for these attributes to facilitate data collection in places where English is not the primary or only language. This includes Wales, which has two official languages: English and Welsh. Furthermore, soundscapes is a recently legislated area of Welsh Government environmental policy, and so data collection is due to increase in Wales, including via ISO/TS 12913-2:2018 (Method A), as recommended by the Government. Therefore, Welsh Language translations of the eight attributes are needed. This article proposes said translations, developed through four phases of research: linguistic research by the Welsh Government’s Translation Service; a workshop attended by non-specialist Welsh-speaking civil servants; a review stage that included bibliographic research; and a second, informal, consultation with Government translators. Results detail the issues of comprehensibility and semantic suitability that arose when discussing translations, including discussions of English loanwords, cf. ‘Chaotic’, and the unfamiliarity of ‘eventfulness’ as a concept. Single word translations are suggested for four of the terms in the final proposed set, which consists of: <em>Dymunol</em>/<em>Pleserus</em>, <em>Llonydd</em>, <em>Digynnwrf</em>/<em>Diddigwydd</em>, <em>Undonog</em>, <em>Niwsans</em>/<em>Amhleserus</em>, <em>Cynhyrfus</em>/<em>Llawn digwydd</em>, <em>Caotig</em>, <em>Bywiog</em>. The article closes with suggestions for how the provisional translations ought to be tested and validated at a future date and highlights how the data generated may be useful when involving other Celtic languages in the SATP as well as the unique opportunity that Welsh offers in that all its speakers are naturally bilingual in Welsh and English, thereby allowing for comparison between the two languages without having to compare different sets of contributors.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111199"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748731","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}

{"title":"Aircraft noise propagation under realistic atmospheric conditions: Comparison of a ray-tracing model with in-situ measurements","authors":"Bill Kayser ,&nbsp;Didier Dragna","doi":"10.1016/j.apacoust.2025.111187","DOIUrl":"10.1016/j.apacoust.2025.111187","url":null,"abstract":"<div><div>A ray-based numerical model for aircraft noise propagation that accounts for source motion, ground effects, and atmospheric effects as recently proposed (Kayser et al., 2024, Acta Acustica, 8, 62) is evaluated against measurements. Prior to this comparison, an extension of the model is introduced to incorporate coherence loss due to atmospheric turbulence scattering. To capture realistic conditions, noise of aircraft flyovers was recorded on-site, along with aircraft trajectory and meteorological data, including wind and temperature profiles. The spectrograms at 1.2 m above the ground are extrapolated from the measured spectrograms at the ground level using a transfer function computed from both the proposed ray-tracing model and an existing heuristic model from the literature, which neglects refraction. Comparison with the spectrograms measured at 1.2 m shows that both models are capable of reproducing the spectrograms with good accuracy. However, the ray-based model demonstrates greater precision in capturing interference patterns, particularly when the aircraft is not directly overhead relative to the receiver (i.e., for <em>slant</em> propagation), where refraction plays a more significant role.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111187"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749023","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}

{"title":"Prediction of subjective annoyance penalty of impulsive noise based on objective measurements","authors":"Valtteri Hongisto,&nbsp;Ville Rajala ,&nbsp;Pekka Saarinen","doi":"10.1016/j.apacoust.2025.111186","DOIUrl":"10.1016/j.apacoust.2025.111186","url":null,"abstract":"<div><div>Many regulations and standards penalize noise with an impulsive character by adding a constant correction to the measured equivalent A-weighted sound level, <em>L</em>_Aeq. This is expected to correspond better with perceived annoyance. Annoyance with impulsive noise may not correlate with such a simple procedure. The ISO/PAS 1996-3 describes a method for the measurement of onset rate and level difference of impulses and offers an objective procedure to calculate the penalty. Purpose of our study is to compare the results of this and four other procedures with experimental psychoacoustics data. Based on these comparisons, a procedure that uses the difference between the 1 and 99 percentile levels is recommended for assessing outdoor impulsive sounds in the range 45–65 dB <em>L</em>_Aeq because of its simplicity.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111186"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694779","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}

{"title":"Vertically spaced ring-like elastic metamaterials for broadband tunability of low-frequency flexural waves","authors":"Duy Binh Pham,&nbsp;Shyh-Chour Huang","doi":"10.1016/j.apacoust.2025.111176","DOIUrl":"10.1016/j.apacoust.2025.111176","url":null,"abstract":"<div><div>Achieving continuous and stable tunability of local resonators without requiring ongoing external stimuli, while maintaining a broad low-frequency bandgap, remains a significant challenge in elastic metamaterials. This study introduces a novel tunable metamaterial for flexural wave isolation, consisting of a compact elastic ring-like frame integrated with a central mass block formed by bolt–nut–gasket assemblies. Tunability is attained by adjusting the vertical separation between two stacked elastic layers through the rotational angle of threaded nuts, thereby modulating the system’s flexural stiffness. This approach enables continuous, reversible, and passive control of flexural wave propagation. The tuning mechanism is systematically investigated through theoretical modeling, finite element simulations, and experimental validation, encompassing dispersion analysis and frequency response studies of both infinite and finite structures. Results confirm the effectiveness of the proposed design in low-frequency vibration attenuation. Parametric studies further elucidate the role of geometric features on bandgap tunability. Potential applications, including vibration isolation, flexural wave barriers, and external vibration absorption for tubular structures, are demonstrated, and a comparative evaluation highlights the advantages of the proposed design relative to state-of-the-art tunable metamaterials.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111176"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694268","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}

{"title":"The scientific works of professor Keith Attenborough","authors":"David L. Berry ,&nbsp;Shahram Taherzadeh ,&nbsp;Olga Umnova ,&nbsp;Anton Krynkin ,&nbsp;Kiril Horoshenkov","doi":"10.1016/j.apacoust.2025.111160","DOIUrl":"10.1016/j.apacoust.2025.111160","url":null,"abstract":"<div><div>Prof. Attenborough’s distinguished career spans over five decades during which he has made seminal contributions to the field of physical acoustics. His extensive research encompasses acoustic propagation in and above porous media, acoustic penetration into rigid frame and poro-elastic materials, and environmental noise control. This article celebrates his work highlighting its foundational basis, scientific impact, and practical applications.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"244 ","pages":"Article 111160"},"PeriodicalIF":3.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529489","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}

{"title":"Noise source identification and its generation causes analysis on wind turbine blade under overall ice-covered conditions","authors":"Zhe Li,&nbsp;Hongmei Cui,&nbsp;Yangxu Fu,&nbsp;Xinkai Wang,&nbsp;Zhili Cui","doi":"10.1016/j.apacoust.2025.111161","DOIUrl":"10.1016/j.apacoust.2025.111161","url":null,"abstract":"<div><div>The wind turbine blade icing significantly affects their aerodynamic performance and power output as well as the noise emission. Therefore, it is important to identify the noise source of the icing wind turbine blade and explore its noise generation causes by means of noise, vibration experiments and numerical simulations. Firstly, it is found that the turbine noise source moves towards the tip of the blade along the blade spanwise direction as the icing mass increases through analyzing the noise signal. Meanwhile, the moving span of the noise source location is not obvious when the icing mass on the blade surface is small. However, the noise source location undergoes a step change when the ice mass reaches a critical value. Furthermore, coherent analysis of measured wind turbine noise and vibration signals indicates that under icing conditions, mechanical noise dominates the wind turbine noise spectrum up to 1000 Hz, while aerodynamic noise becomes predominant between 1000 and 4000 Hz. At the same time, the Large Eddy Simulation (LES) modal combined with Ffowcs Williams-Hawkings (FW-H) equation is used to analyze the causes of aerodynamic noise changes in the wind turbine after icing. It is found that the shape change of the leading and trailing edges of the wind turbine blade from the blade mid-section to the blade tip after icing has the greatest influence on the aerodynamic acoustic characteristics of the wind turbine by combining and analyzing the dynamic pressure cloud diagrams and the noise sound pressure level spectrograms. Finally, it can be found that the size of the vortices structure of the wind turbine blade increases after icing, and the number of vortices structures increases by analyzing the vortices cloud diagram of the wind turbine blade. The number and size of vortices structures in the static ice-covered blades are larger than those in the dynamic ice-covered blades. The maximum pressure is mainly concentrated on the trailing edge of the wind turbine blade. It shows that the blade icing eventually leads to the number and size increase of trailing edge shedding vortices as well as the pressure increase, and finally causes the generation of aerodynamic noise. This research achievement will provide sufficient technical support for non-contact real-time monitoring wind turbine icing condition in the future.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"244 ","pages":"Article 111161"},"PeriodicalIF":3.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571860","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}