Applied Acoustics最新文献_第4页

Urban noise pollution prediction using traffic patterns and AI models in Sahloul Road, Sousse City, Tunisia 突尼斯苏塞市Sahloul路使用交通模式和人工智能模型进行城市噪音污染预测

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.apacoust.2025.111218

Najah Kechiche , Jawher Bouaziz , Nader Boumrifeg , Walid Hassen , Tarek Salem Abdennaji , Chemseddine Maatki , Badr M. Alshammari , Lioua Kolsi

{"title":"Urban noise pollution prediction using traffic patterns and AI models in Sahloul Road, Sousse City, Tunisia","authors":"Najah Kechiche , Jawher Bouaziz , Nader Boumrifeg , Walid Hassen , Tarek Salem Abdennaji , Chemseddine Maatki , Badr M. Alshammari , Lioua Kolsi","doi":"10.1016/j.apacoust.2025.111218","DOIUrl":"10.1016/j.apacoust.2025.111218","url":null,"abstract":"<div><div>This study evaluates multiple machine learning and deep learning approaches for forecasting A-weighted equivalent continuous sound levels (LAeq) and investigates spatiotemporal fluctuations in road traffic noise at the Sahloul Road in Sousse City, Tunisia. Road traffic noise levels (dB)) were measured at five urban sites with differing traffic intensities using TES 1352A sound level meter, with data collected at both hourly and 15-minute intervals. Classification of traffic composition into motorcycles, light vehicles, and heavy vehicles is carried out using the video-monitored traffic count. Results show that heavy vehicles and total traffic volume present the strongest correlation with noise levels. Maximum noise occurred during the morning (07:00–09:00) and evening (16:00–18:00) hours, which exceeded the World Health Organization (WHO) guideline by more than 50 % for the entire measurement study. Four machine learning algorithms (XGBoost, Random Forest, LightGBM, and LSTM) are applied, utilizing vehicle counts as factors indicating traffic volume for the prediction of LAeq. On an hourly timescale, the performance of the XGBoost algorithm was best (R2 = 0.952, MAE = 0.18 dB). However, the performance of the algorithm decreased progressively for smaller temporal resolutions, which showed a marked difference among the two timescales, indicating higher variability of noise at the smaller timescale. As such, the LSTM algorithm indicated poor performance, specifically at the temporal resolutions (15 min). this study’s findings have brought out the effectiveness of ensemble tree-based methods for predicting urban noise levels, as well as the importance of considering the time resolution when structuring measures for reducing urban noise pollution.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111218"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884046","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

A Bayesian subspace equivalent source method based on proper orthogonal decomposition for jet noise identification 基于适当正交分解的贝叶斯子空间等效源方法用于射流噪声识别

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.apacoust.2025.111188

Liangshuo Yuan , Daofang Feng , Youtai Shi , Qixin Guo , Junjian Hou , Liang Yu , Yudong Zhong

{"title":"A Bayesian subspace equivalent source method based on proper orthogonal decomposition for jet noise identification","authors":"Liangshuo Yuan , Daofang Feng , Youtai Shi , Qixin Guo , Junjian Hou , Liang Yu , Yudong Zhong","doi":"10.1016/j.apacoust.2025.111188","DOIUrl":"10.1016/j.apacoust.2025.111188","url":null,"abstract":"<div><div>Jet noise source identification represents an important research direction in the field of aeroacoustics and has significant importance for aviation engine noise reduction and environmental protection. Jet noise belongs to typical distributed coherent sources, and strong coherence generated by large-scale turbulent structures poses major challenges to traditional acoustic source identification methods. To address this problem, this paper proposes a Bayesian subspace equivalent source method based on proper orthogonal decomposition (POD). The proposed method first extracts the primary coherent structures of acoustic fields through proper orthogonal decomposition, effectively suppressing background noise interference. The method then establishes a Bayesian regularization framework that utilizes marginal likelihood functions to achieve automatic optimization of regularization parameters, effectively avoiding singularities in inverse problems. Algorithm performance was systematically validated through three approaches: line source simulations, large eddy simulation data analysis of Mach 0.9 jets, and free jet wind tunnel experiments. The validation successfully separated and localized the spatial distribution of jet noise sources under different Strouhal number conditions. Results demonstrate that the proposed method has good reconstruction accuracy and directivity characteristics within the large-scale turbulent frequency range. Compared to traditional equivalent source methods, the proposed method exhibits significant advantages in acoustic source distribution characteristic estimation. The advantages are primarily attributed to the synergistic effect of intrinsic coherence between source decomposition techniques and equivalent sources.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111188"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748730","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

A hybrid meta-structure with topology-optimized composite porous material and Helmholtz resonator for low-frequency and broadband sound absorption 具有拓扑优化的复合多孔材料和用于低频和宽带吸声的亥姆霍兹谐振腔的混合元结构

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-08 DOI: 10.1016/j.apacoust.2025.111189

Feifei Feng, Chuan He, Lei Diao, Shihao Tang, Meng Tao

{"title":"A hybrid meta-structure with topology-optimized composite porous material and Helmholtz resonator for low-frequency and broadband sound absorption","authors":"Feifei Feng, Chuan He, Lei Diao, Shihao Tang, Meng Tao","doi":"10.1016/j.apacoust.2025.111189","DOIUrl":"10.1016/j.apacoust.2025.111189","url":null,"abstract":"<div><div>A hybrid <em>meta</em>-structure composed of composite porous material modulation crowns and Helmholtz resonators with embedded porous material is designed for low-frequency, broadband, and highly efficient sound absorption. The sound absorption coefficients of the hybrid <em>meta</em>-structure are calculated by combining the equivalent medium theory and the double porosity theory, and their accuracy is validated through an experimental method and a finite element method. The acoustic performance of the hybrid <em>meta</em>-structure is analyzed, and it is shown that, similar to the traditional Helmholtz resonator, the hybrid <em>meta</em>-structure can trigger the resonance sound absorption mechanism. In comparison with the Helmholtz resonator with embedded porous material and the traditional Helmholtz resonator, the hybrid <em>meta</em>-structure has a lower peak frequency and a broader absorption band. Driven by the embedded porous material and composite porous material modulation crown, the cavity dominates the sound energy dissipation near the resonance frequency, and the hybrid <em>meta</em>-structure retains a certain sound energy dissipation capability away from the resonance frequency. Finally, a hybrid <em>meta</em>-structure consisting of nine subunits in parallel is designed, and the Helmholtz resonators with embedded porous material and composite porous material modulation crowns are sequentially designed using a structural optimization algorithm and a non-gradient topology optimization algorithm. The optimized hybrid <em>meta</em>-structure with a thickness of 60 mm achieved highly efficient absorption (<span><math><mrow><mi>α</mi><mo>≥</mo><mn>0.8</mn></mrow></math></span>) across a frequency band of [289 1230] Hz, which can be widely used for low-frequency noise control at subwavelength scales in various engineering fields.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111189"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749022","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

Dynamics of the harmonic acoustic pneumatic source for active control of time-varying tonal noise 气动谐波声源的动态特性及其对时变音调噪声的主动控制

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI: 10.1016/j.apacoust.2025.111219

Alexandre Schiavini , Philippe Micheau , Pierre Grandjean , Gwénaël Gabard , Thomas Humbert

{"title":"Dynamics of the harmonic acoustic pneumatic source for active control of time-varying tonal noise","authors":"Alexandre Schiavini , Philippe Micheau , Pierre Grandjean , Gwénaël Gabard , Thomas Humbert","doi":"10.1016/j.apacoust.2025.111219","DOIUrl":"10.1016/j.apacoust.2025.111219","url":null,"abstract":"<div><div>The Harmonic Acoustic Pneumatic Source (HAPS), a mechanical airflow modulator, is a promising alternative to loudspeakers as secondary sources for the active control of harmonic noise, thanks to its ability to generate high sound pressure levels and to precisely control signal frequency, phase, and amplitude. However, this source requires a specialized control strategy, as it operates through mechanical modulation at a predetermined frequency. Hence, conventional adaptive control techniques are not directly applicable. Furthermore, when dealing with time-varying harmonic noise, the dynamic performance of the control system, which is influenced by the dynamic properties of the HAPS, is challenged. The originality of this study lies in considering this source, not as a tonal source, but as a narrow-band mechanical modulator that generates a narrow-band anti-noise by driving its complex envelope, allowing the active control of time-varying primary noise. A model of the dynamic response of the Harmonic Acoustic Pneumatic Source and of its controller is presented, with an analysis of the theoretical dynamic performances and limitations of this control system. The controller uses either a far-field error microphone or a near-field error microphone with a previously established compensation strategy. The closed-loop model is validated with experimental results. Simulations and experiments of far-field and near-field active noise control on slow time-varying primary noise are conducted to characterize the dynamic performances and limitations of the controller. The simulations are in good agreement with the experimental results.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111219"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938573","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

Predicting the age effects on concurrent vowel scores using a temporal jitter computational model 使用时间抖动计算模型预测年龄对并发元音分数的影响

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-27 DOI: 10.1016/j.apacoust.2025.111215

Harshavardhan Settibhaktini , Rithik Rathi , Ananthakrishna Chintanpalli

{"title":"Predicting the age effects on concurrent vowel scores using a temporal jitter computational model","authors":"Harshavardhan Settibhaktini , Rithik Rathi , Ananthakrishna Chintanpalli","doi":"10.1016/j.apacoust.2025.111215","DOIUrl":"10.1016/j.apacoust.2025.111215","url":null,"abstract":"<div><div>The difference in fundamental frequency (F0) among vowels is a crucial cue for detecting concurrent vowels. Normal hearing (NH) listeners have higher percent identification scores for both vowels as the F0 difference increased, reaching an asymptote at ∼ 3 Hz. In complex listening environments, aged hearing (AH) listeners exhibit a reduction in the overall concurrent vowel scores across F0 differences, which may be related to age-related loss of neural synchrony in the auditory system. To understand these age effects, the current modeling study predicts the concurrent vowel scores across F0 differences for both NH and AH subjects. The NH model used the neural responses of an auditory-nerve (AN) model with the neurogram similarity index measure (NSIM) metric, instead of the previous F0-guided segregation, to predict concurrent vowel scores. Previous behavioral studies have shown that temporal jitter in the acoustic domain can cause an age-related decrease of neural synchrony, resulting in reduced identification scores. Thus, a temporal-jitter concurrent vowel was implemented in the AH model to obtain the neurograms from the AN model. The NSIM metric was applied on these neurograms to predict the concurrent vowel scores of AH subjects. Both models qualitatively predicted the concurrent vowel scores pattern across F0 differences, obtained from the previous behavioral data. A chi-square test analysis has shown that the scores correlated well with the concurrent vowel data. The temporal-jitter AH model predictions showed neural asynchrony, reducing the concurrent vowel scores among AH listeners. These model predictions suggest that the neural asynchrony in the temporal-jitter AH model might contribute to the reduced concurrent vowel scores across F0 differences.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111215"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840711","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

Automatic detection of Parkinson’s disease from speech signals using the Fourier–Bessel domain adaptive wavelet transform 基于傅里叶-贝塞尔域自适应小波变换的语音信号帕金森病自动检测

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2026-01-03 DOI: 10.1016/j.apacoust.2025.111217

Sudhansu Sekhar Nayak , Anand D. Darji , Prashant K. Shah , Juan Rafael Orozco-Arroyave

{"title":"Automatic detection of Parkinson’s disease from speech signals using the Fourier–Bessel domain adaptive wavelet transform","authors":"Sudhansu Sekhar Nayak , Anand D. Darji , Prashant K. Shah , Juan Rafael Orozco-Arroyave","doi":"10.1016/j.apacoust.2025.111217","DOIUrl":"10.1016/j.apacoust.2025.111217","url":null,"abstract":"<div><div>There has been a growing interest in the development of automated methods to diagnose Parkinson’s disease from speech. These approaches can potentially be used in telemonitoring health applications; however, there is still much to be done in the process of developing accurate methods to perform the diagnosis. The purpose of this paper is to present a novel and efficient approach for detecting Parkinson’s disease from speech signals. Parkinson’s disease speech is modeled utilizing the Fourier–Bessel domain adaptive wavelet transform. The signal is decomposed by the Fourier–Bessel domain adaptive wavelet transform into several modes. Energy, entropy, increment entropy, and spectral entropy are extracted from each of the decomposed signals, and a combination of these features is evaluated using the isolated words and sustained vowels from the PC-GITA database. Support vector machine classifier achieves a maximum classification accuracy of 95 % for /drama/. Furthermore, with the aim of evaluating the generalization capability of the introduced approach, the model optimized with PC-GITA is used to perform the automatic classification of Parkinson’s disease vs. healthy control subjects in an independent dataset with a classification accuracy of 84 %. The results show that the proposed approach based on the Fourier–Bessel domain adaptive wavelet transform decomposition is accurate and efficient. Additionally, it showed robustness against unseen data collected under non-controlled acoustic conditions, making it a good candidate to develop computational systems that work properly in real-world clinical practice.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111217"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884082","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

Aeroacoustic impact of heat exchanger installation in an industrial engine cooling module 工业发动机冷却模块中热交换器安装的气动声学影响

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-07 DOI: 10.1016/j.apacoust.2025.111175

Francesco Bellelli , Renzo Arina , Stéphane Moreau , Francesco Avallone

{"title":"Aeroacoustic impact of heat exchanger installation in an industrial engine cooling module","authors":"Francesco Bellelli , Renzo Arina , Stéphane Moreau , Francesco Avallone","doi":"10.1016/j.apacoust.2025.111175","DOIUrl":"10.1016/j.apacoust.2025.111175","url":null,"abstract":"<div><div>Engine cooling fan noise becomes even more difficult to predict when considering the presence of the heat exchanger upstream. This paper investigates the impact of different heat exchanger installations on the noise sources of an industrial engine cooling fan using high-fidelity lattice-Boltzmann simulations. The heat exchanger is simulated using an equivalent porous medium upstream of the fan. Four configurations are analyzed at free discharge: full cooling module (i) without and (ii) with a gap between the heat exchanger and its casing, (iii) Fan+Frame, and (iv) Fan. For the sake of comparison, configurations (iii) and (iv) are simulated by imposing a pressure difference that matches the one across the heat exchanger, to ensure that the same operating point is maintained. Results show negligible differences in the overall aerodynamic performance since the same average pressure rise is achieved. The presence of the porous medium affects the spatial distribution of the pressure field upstream of the fan, thus causing a higher tonal content compared to the configurations (iii) and (iv). Further subharmonic humps are caused by the interaction of the blades with vortex structures generated by flow separation at the tip and the casing’s support structures. The presence of a geometry transition from square to round in the casing causes inflow distortions, increasing low-frequency broadband noise.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"111175"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694777","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

Physical effects of driving an acoustic synthetic jet actuator with a low-cost audio amplifier: A vibration study 用低成本音频放大器驱动声学合成射流驱动器的物理效应：振动研究

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.apacoust.2025.111203

G. Rodríguez-Rojas, S. Sánchez, J.F. Hernández-Sánchez

{"title":"Physical effects of driving an acoustic synthetic jet actuator with a low-cost audio amplifier: A vibration study","authors":"G. Rodríguez-Rojas, S. Sánchez, J.F. Hernández-Sánchez","doi":"10.1016/j.apacoust.2025.111203","DOIUrl":"10.1016/j.apacoust.2025.111203","url":null,"abstract":"<div><div>Synthetic Jet Actuators (SJAs) employ a Helmholtz resonator coupled to a driver, causing rapid periodic volume changes within the cavity. In typical acoustic SJAs, a speaker controlled via a function generator and audio amplifier (AA) drives these changes. While commercial AAs balance cost, linearity, and efficiency, their frequency-response characteristics vary significantly, which may degrade SJA’s performance. This work demonstrates that a low-cost AA introduces an unintended, variable-amplitude harmonic oscillator that acts as a band-suppression filter near 90 Hz, coinciding with the cavity resonance. This filter inhibits cavity resonance, creating competing dynamics that shape the SJA behavior. Frequency and vibration analysis revealed that replacing the low-cost AA with a higher-quality amplifier eliminates this coupling, confirming the oscillator is rooted in the AA. Further investigation shows that the band-suppression oscillator only interacts with the Helmholtz resonance when the cavity is open to the environment. At higher frequencies, the AA-driven oscillation amplitude surpasses the amplitude of the Helmholtz resonance by up to a factor of 13. These results highlight the critical role of amplifier selection, design, and implementation in acoustic SJA performance, with direct implications for actuator design in applications that require precise control.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111203"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748726","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

Tailoring vibration modes in piezoelectric metamaterial beams for sound directivity control 用于声指向性控制的压电超材料梁的振动模式裁剪

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-27 DOI: 10.1016/j.apacoust.2025.111214

Camila Sanches Schimidt , Leopoldo Pisanelli Rodrigues de Oliveira , Virgilio Junior Caetano , Carlos De Marqui Junior

{"title":"Tailoring vibration modes in piezoelectric metamaterial beams for sound directivity control","authors":"Camila Sanches Schimidt , Leopoldo Pisanelli Rodrigues de Oliveira , Virgilio Junior Caetano , Carlos De Marqui Junior","doi":"10.1016/j.apacoust.2025.111214","DOIUrl":"10.1016/j.apacoust.2025.111214","url":null,"abstract":"<div><div>This work presents a reconfigurable piezoelectric metamaterial beam designed to manipulate acoustic radiation and control sound directivity through tailored vibrational modes. The proposed architecture enables the induction of specific modes at arbitrary frequencies via an electromechanical coupling mechanism. The beam incorporates periodically distributed piezoelectric elements, each connected to digitally programmable synthetic impedance shunts that allow adaptive tuning. The metamaterial is divided into three regions: a central section that amplifies a selected target mode shape and two side sections that operate within a programmed band gap to suppress bending waves. A modal-analysis-based modeling framework captures the combined effects of band gap tuning and mode induction, guiding the selection of shunt parameters to achieve the desired vibration patterns. Experimental measurements show excellent agreement with numerical predictions, confirming the model’s accuracy and the effectiveness of the reconfiguration strategy in reproducing similar vibration shapes at different frequencies. Coupled structural–acoustic simulations further demonstrate the steering of radiated sound energy by modulating the beam’s vibration profile. The results highlight the metamaterial’s ability for on-demand wave manipulation and adaptive sound field shaping, exhibiting similar directivity patterns at distinct frequencies. Overall, the findings establish a versatile platform for adaptive wave manipulation and sound directivity control.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111214"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840712","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

An inverse method for source identification in rectangular waveguides with reverberation 含混响矩形波导中声源识别的逆方法

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-19 DOI: 10.1016/j.apacoust.2025.111209

Xin Liu, Xiaodong Jing

{"title":"An inverse method for source identification in rectangular waveguides with reverberation","authors":"Xin Liu, Xiaodong Jing","doi":"10.1016/j.apacoust.2025.111209","DOIUrl":"10.1016/j.apacoust.2025.111209","url":null,"abstract":"<div><div>Closed-section wind tunnels represent a typical reverberant environment where microphone arrays are frequently used to identify noise sources. However, wall reflections can be a serious problem for source localization, especially at lower frequencies or when a source locates close to reflecting walls. To address this problem, a novel inverse method is developed for source localization in a hard walled rectangular duct, which incorporates wall reflections into the proposed algorithm by using an appropriate rectangular waveguide Green’s function. No flow is considered in this study, focusing solely on wall reflection effects. Numerical and experimental results obtained with the conventional beamforming (CBF), the image source model (ISM) and the present inverse method (IM) are presented and analyzed. Pronounced spurious sidelobes appear on the CBF maps, causing reduced resolution or erroneous source location at low frequencies. The ISM can remove most of the spurious side lobes, but it still suffers from low resolution at low frequencies and its spatial resolution is direction dependent. By comparison, the IM shows considerably improved performance in terms of mainlobe width, localization accuracy and sidelobe level, with its resolution close to omnidirectional similar to that obtained under anechoic conditions. It is effective for both coherent and incoherent sound sources. At the low frequency of 500 Hz, it achieves subwavelength resolution by exploiting evanescent modes. Furthermore, the robustness of the IM to noise is examined through both simulations and experiments, showing that it outperforms the other two methods at an SNR of 10 dB.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"245 ","pages":"Article 111209"},"PeriodicalIF":3.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798064","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