Applied Acoustics最新文献

Adaptive optimization strategy for total focusing ultrasonic imaging using sparse array combined with metric learning in dual-layer medium 双层介质中基于稀疏阵列和度量学习的全聚焦超声成像自适应优化策略

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-05 DOI: 10.1016/j.apacoust.2026.111246

Penghui Zhang , Shiwei Ma , Kaihua Huang , Qi Zhu , Haiyan Zhang

{"title":"Adaptive optimization strategy for total focusing ultrasonic imaging using sparse array combined with metric learning in dual-layer medium","authors":"Penghui Zhang , Shiwei Ma , Kaihua Huang , Qi Zhu , Haiyan Zhang","doi":"10.1016/j.apacoust.2026.111246","DOIUrl":"10.1016/j.apacoust.2026.111246","url":null,"abstract":"<div><div>Phased array ultrasonic testing based on complete matrix data enables high-quality imaging through comprehensive signal processing. However, applying the total focusing scanning imaging to data-intensive complete datasets from composite structures often results in processing delays and defect localization inaccuracies. To overcome these challenges, this paper proposes an adaptive sparse array imaging algorithm incorporating an image quality assessment mechanism. An approximately optimal array element configuration is obtained by applying an improved genetic algorithm that performs real-number encoding and conducts efficient optimization within the initialized array search space. The optimized array element configuration provides the fundamental data required for fast image reconstruction in dual-layer media. A finite element model is then developed to simulate phased array inspection of a medium with discontinuous impedance, from which complete matrix data is extracted for sparse array imaging. Subsequently, image feature extraction and quality evaluation are performed using a Siamese convolutional neural network. Experimental validation is carried out on wedge-coupled thick fiber laminated specimens. Both simulation and experimental results demonstrate that the proposed imaging strategy effectively balances image quality with the number of activated array elements. It significantly improves the reconstruction efficiency for discontinuous impedance materials while maintaining satisfactory levels of signal-to-noise ratio and the array performance index.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111246"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174983","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

Active noise control mechanism for the low-frequency sound field of a cylindrical shell 圆柱壳低频声场的主动噪声控制机制

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-02 DOI: 10.1016/j.apacoust.2026.111241

Jinpeng Liu , Chao Zhang , Dejiang Shang

{"title":"Active noise control mechanism for the low-frequency sound field of a cylindrical shell","authors":"Jinpeng Liu , Chao Zhang , Dejiang Shang","doi":"10.1016/j.apacoust.2026.111241","DOIUrl":"10.1016/j.apacoust.2026.111241","url":null,"abstract":"<div><div>Current research on the active control of low-frequency omnidirectional noise from underwater structures remains limited. Most studies concentrate on control system algorithms, with insufficient attention to the specific mechanisms governing acoustic field control. To address this gap, this study applies the minimum space square sound pressure method to control the low-frequency radiated acoustic field of a typical cylindrical shell structure and analyze sound field control mechanism. The approach follows a control strategy aimed at minimizing the total radiated energy of the acoustic field in space. Numerical simulations and lake experiments are conducted. The results show that the low-frequency radiated acoustic field of the cylindrical shell can be effectively controlled using this method. The findings clarify the mechanism of low-frequency active control, which operates through three pathways: reducing the output power of the primary sound source, enabling energy absorption by the secondary sound source, and the combined effect of both, and clearly establish how the energy is reduced in the sound field control process. This investigation of the acoustic field control mechanism provides a theoretical foundation for optimizing active control systems.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111241"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146096207","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

Feature extraction of rolling bearing fault signal based on adaptive feature mode decomposition algorithm 基于自适应特征模式分解算法的滚动轴承故障信号特征提取

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-02 DOI: 10.1016/j.apacoust.2026.111251

Meixuan Li , Yingjie Fan , Yuexian Lin

{"title":"Feature extraction of rolling bearing fault signal based on adaptive feature mode decomposition algorithm","authors":"Meixuan Li , Yingjie Fan , Yuexian Lin","doi":"10.1016/j.apacoust.2026.111251","DOIUrl":"10.1016/j.apacoust.2026.111251","url":null,"abstract":"<div><div>Considering that the feature extraction of bearing vibration-acoustic signals (a key carrier of fault information via acoustic radiation of defective bearings) is challenging due to their non-stationarity and strong background noise, a parameter-optimized Adaptive Feature Mode Decomposition (AFMD) algorithm is proposed for acoustic fault feature extraction of rolling bearings. Because the signal feature extraction performance of the traditional Feature Mode Decomposition (FMD) algorithm is affected by its own parameter filter length <span><math><mi>L</mi></math></span>, mode number <span><math><mi>N</mi></math></span> and cut frequency band number <span><math><mi>K</mi></math></span>, this paper uses the Improved Sparrow Search Algorithm (ISSA) to optimize the parameters of the FMD algorithm. Specifically, a new influence index called the Comprehensive Feature-Sensitivity Index (CFSI) is initially designed. By comparing the new influence index with existing evaluation indicators, its higher sensitivity to the fault signals of rolling bearings is verified. Secondly, the CFSI is taken as the objective function of the ISSA, and the optimal parameter combination of the Feature Mode Decomposition algorithm is obtained through the optimization of the algorithm. Based on the optimized parameters, the Adaptive Feature Mode Decomposition algorithm is used to extract the features of the measured signals. Finally, through simulation and practical case experiments, the effectiveness and feasibility of the proposed model in extracting the fault features of rolling bearings are verified.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111251"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174987","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

Correlation characteristics investigation of Flow-Induced noise in Pump-Turbines based on EEMD 基于EEMD的水轮机流致噪声相关特性研究

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-10 DOI: 10.1016/j.apacoust.2026.111259

Xiaojun Li , Dawei Sun , Zhicong Wei , Haijiang Shao , Kun Wang

{"title":"Correlation characteristics investigation of Flow-Induced noise in Pump-Turbines based on EEMD","authors":"Xiaojun Li , Dawei Sun , Zhicong Wei , Haijiang Shao , Kun Wang","doi":"10.1016/j.apacoust.2026.111259","DOIUrl":"10.1016/j.apacoust.2026.111259","url":null,"abstract":"<div><div>Pump-turbines are critical components in Pumped Hydro Energy Storage (PHES) systems; however, the relationship between internal flow characteristics and flow-induced noise generation is not yet fully understood, particularly during pump mode operation.This study aims to elucidate the influence mechanisms of flow characteristics on flow-induced noise in a pump-turbine. Experimental measurements and numerical simulations were employed, with the Ffowcs Williams–Hawkings (FW-H) acoustic analogy applied for noise prediction. The Ensemble Empirical Mode Decomposition (EEMD) method was utilized to perform multi-scale decomposition and energy distribution analysis of Intrinsic Mode Functions (IMFs) derived from the noise signals. The results demonstrate that the dominant noise frequency shifts with varying flow rates: the blade passing frequency (BPF) predominates at low flow rates, while the 3 × BPF becomes more prominent at high flow rates. This shift is directly correlated with the intensity of flow separation and rotor–stator interaction (RSI) within the volute. The highest sound pressure level was identified in the volute, with dipole sources constituting the primary noise origin. A strong positive correlation was observed between the pressure pulsation coefficient of various components and the sound pressure level. These findings provide new insights into the fluid-acoustic mechanisms in pump-turbines.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111259"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174982","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

Characterisation of intrinsically healing fibre-reinforced polymer composites: an acousto-ultrasonic approach 内在愈合纤维增强聚合物复合材料的表征：一种声-超声方法

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-05 DOI: 10.1016/j.apacoust.2026.111249

Claudia Barile, Vimalathithan Paramsamy Kannan

{"title":"Characterisation of intrinsically healing fibre-reinforced polymer composites: an acousto-ultrasonic approach","authors":"Claudia Barile, Vimalathithan Paramsamy Kannan","doi":"10.1016/j.apacoust.2026.111249","DOIUrl":"10.1016/j.apacoust.2026.111249","url":null,"abstract":"<div><div>The poor interlaminar properties of the fibre-reinforced polymer (FRP) composites limit their structural applications. One of the novel ways to mitigate this problem is the incorporation of intrinsic healing capability into the FRPs. In this research work, the intrinsic healing capability of two configurations of carbon FRPs (CFRPs) is characterised under 3-point bending tests. The mechanical test results show that one of the CFRP configurations, the unidirectional (UD200) CFRP, is able to significantly recover the flexural properties. The other configuration, twill-weave (TW415) did not recover the flexural properties as efficiently as the UD200. Nevertheless, it is still able to mitigate severe failure modes after healing. To monitor the healing process non-destructively, a stress wave-based analysis, the acousto-ultrasonic (AU) approach is used. A novel risetime parameter <span><math><mrow><mi>R</mi><msub><mi>T</mi><mi>f</mi></msub></mrow></math></span> is developed to analyse the stress wave signals. The results show that <span><math><mrow><mi>R</mi><msub><mi>T</mi><mi>f</mi></msub></mrow></math></span> is able to monitor the healing process efficiently. The final results demonstrated the capability of the novel destructive and non-destructive methods for characterising these innovative composite materials.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111249"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174989","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

Study of broadband noise control by a ventilated metamaterial based on Fabry-Pérot scatterers 基于法布里-帕氏散射体的通风超材料宽带噪声控制研究

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-02 DOI: 10.1016/j.apacoust.2026.111245

Gildean do N. Almeida, Andrey B. da Silva, Rafael R. Goes, Erasmo F. Vergara, Arcanjo Lenzi

{"title":"Study of broadband noise control by a ventilated metamaterial based on Fabry-Pérot scatterers","authors":"Gildean do N. Almeida, Andrey B. da Silva, Rafael R. Goes, Erasmo F. Vergara, Arcanjo Lenzi","doi":"10.1016/j.apacoust.2026.111245","DOIUrl":"10.1016/j.apacoust.2026.111245","url":null,"abstract":"<div><div>The duality between sound insulation and air ventilation currently represents one of the most promising research areas in applied acoustical physics and noise control. In this context, this paper presents the design of a metamaterial that enables air ventilation and sound attenuation over a wide frequency band. The unit cell consists of a square aperture loaded with two combinations of periodic Fabry-Pérot-type scatterers. The transfer matrix method approach is adopted to evaluate the structure’s behavior under normal wave incidence, while the radiation impedance is used to assess its behavior under diffuse incidence. Theoretical and experimental results show that high sound transmission loss values (<span><math><mo>></mo><mn>29</mn></math></span> dB) in different frequency bands are possible due to the bandgap property; furthermore, this magnitude can be easily defined through the periodicity of the scatterers. In addition, the characteristic of air ventilation of the structure was experimentally demonstrated, showing a maximum airflow reduction of <span><math><mn>40</mn><mo>,</mo><mn>0</mn><mi>%</mi></math></span> and a flow resistivity of <span><math><mi>σ</mi><mo>≈</mo><mn>6.04</mn></math></span> Pa<span><math><mo>⋅</mo></math></span>s<span><math><mo>⋅</mo></math></span>m<sup>−2</sup>. Using a full-scale panel, we demonstrated that the low transmissibility of energy that is incident diffusely on the structure is due to physical-geometric effects, that is, due to local resonances and interactions between scatterers. The structure was then evaluated as an enclosure for a refrigerator noise source; consequently, broadband noise attenuation was achieved, demonstrating the effectiveness of the design. Finally, this work contributes to advances in the field of noise control through ventilated metamaterials.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111245"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146096208","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

Design and noise reduction characteristics of wide-frequency acoustic absorber for traction transformer based on Labyrinth − Helmholtz resonator tandem structure 基于迷宫-亥姆霍兹谐振腔串联结构的牵引变压器宽频吸声器设计及降噪特性研究

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-04 DOI: 10.1016/j.apacoust.2026.111250

Xinbiao Xiao , Yuanyuan Hu , Xinte Wang , Yuanpeng He , Xinyi Li , Yanning Tang

{"title":"Design and noise reduction characteristics of wide-frequency acoustic absorber for traction transformer based on Labyrinth − Helmholtz resonator tandem structure","authors":"Xinbiao Xiao , Yuanyuan Hu , Xinte Wang , Yuanpeng He , Xinyi Li , Yanning Tang","doi":"10.1016/j.apacoust.2026.111250","DOIUrl":"10.1016/j.apacoust.2026.111250","url":null,"abstract":"<div><div>This study addresses the challenge of low-frequency continuous noise from traction transformers by proposing a synergistic absorption-insulation design strategy. We introduce a broadband low-frequency sound-absorbing structure based on a tandem configuration of a labyrinth resonator and a Helmholtz resonator (LRHR). A theoretical model of its acoustic performance is developed using the impedance transfer method and validated through numerical simulation and experiment, revealing the underlying absorption mechanisms. The results demonstrate that the series-connected labyrinth resonator enhances acoustic energy dissipation, enabling the LRHR to achieve excellent low-frequency absorption performance. By leveraging the structural tunability of LRHRs, multiple units with varied parameters are arranged in parallel to form a composite absorber, which exhibits broadband and efficient sound absorption across a wide low-frequency range. Finally, an absorption-insulation composite structure (AICS) is constructed by integrating LRHRs with aluminum panels. Both simulations and experiments confirm that this lightweight structure generates broadband sound insulation peaks that align with the primary noise components of traction transformers, significantly improving the average sound insulation performance while providing notable enhancement near key frequency bands. This work validates the strong application potential of the LRHR-based design in low-frequency noise control and offers an innovative solution for noise mitigation in traction transformers and similar power equipment.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111250"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174984","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

Decoupling method for self-sensing low-frequency sound absorbers based on pulsed current 基于脉冲电流的自感低频吸声器解耦方法

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-11 DOI: 10.1016/j.apacoust.2026.111260

Shiqi Zhang, Xiaochen Zhao, Xinyu Zhang

{"title":"Decoupling method for self-sensing low-frequency sound absorbers based on pulsed current","authors":"Shiqi Zhang, Xiaochen Zhao, Xinyu Zhang","doi":"10.1016/j.apacoust.2026.111260","DOIUrl":"10.1016/j.apacoust.2026.111260","url":null,"abstract":"<div><div>The self-sensing impedance control method combines the adjustability of active control technology with the sensorless characteristics of shunt loudspeakers, achieving compact and efficient sound absorption in the low-frequency range. However, in self-sensing impedance control, the internal resistance characteristics of the transducer can decrease the absorption performance. This paper first analyzes the impact of voice coil impedance on the control effect of the finite impulse response (FIR) filter and presents a method for predicting acoustic performance considering resistance of the voice coil. To avoid this, the paper proposes a self-sensing acoustic impedance control method based on pulse current output, which decouples acquisition and output, avoiding the impact of voice coil impedance on acoustic performance. Furthermore, an FIR filter algorithm suitable for pulse output mode is introduced. To implement the above control method in experiments, corresponding output and acquisition circuits were built, and the algorithm was deployed on a low-cost Arduino. Experimental results show that the equivalent impedance prediction method under pulse mode remains effective, and by adjusting the coefficients, both tonal and broadband absorption effects can be achieved.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111260"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174985","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

Sound absorption of resonant composite metastructure based on machine learning reverse-assisted design 基于机器学习反辅助设计的共振复合元结构吸声研究

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-30 Epub Date: 2026-02-02 DOI: 10.1016/j.apacoust.2026.111242

Nansha Gao , Jiacheng Guo , Mou Wang , Denghui Qin , Qiaogao Huang , Xiao Liang , Guang Pan

{"title":"Sound absorption of resonant composite metastructure based on machine learning reverse-assisted design","authors":"Nansha Gao , Jiacheng Guo , Mou Wang , Denghui Qin , Qiaogao Huang , Xiao Liang , Guang Pan","doi":"10.1016/j.apacoust.2026.111242","DOIUrl":"10.1016/j.apacoust.2026.111242","url":null,"abstract":"<div><div>To realize machine learning reverse-assisted design for resonant sound-absorbing structures, this study introduces resonant composite metastructures, which are constructed from perforated sheets, cavities, insert plates, and porous materials. The sound absorption coefficients within the range of 10,000 Hz were theoretically derived, and the underlying sound absorption mechanisms were thoroughly discussed. A dataset comprising 100,000 randomly generated first peaks was constructed using Latin hypercube sampling to support machine learning applications. Two approaches, a one-stage deep neural network and a two-stage deep neural network incorporating a forward prediction component—were developed to inversely predict the structural dimension parameters of eight resonant sound-absorbing units based on 24 sets of desired first peak characteristics. The results demonstrated that the two-stage model significantly outperformed the one-stage approach, achieving markedly higher accuracy in predicting both the frequency and sound absorption coefficient of the first peaks. The effectiveness of the machine learning predictions was further validated through acoustic impedance tube experiments on two samples designed via the two-stage deep neural network. These findings underscore the potential of machine learning for the efficient and accurate reverse design of resonant sound-absorbing structures.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"247 ","pages":"Article 111242"},"PeriodicalIF":3.4,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174986","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

Tunable acoustic metasurface for low-frequency broadband absorption via asymmetric adjustable apertures 通过不对称可调孔径进行低频宽带吸收的可调谐声学超表面

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2026-03-15 Epub Date: 2026-01-27 DOI: 10.1016/j.apacoust.2026.111237

Jiwan Kim, Yerin Shim, Wonju Jeon

{"title":"Tunable acoustic metasurface for low-frequency broadband absorption via asymmetric adjustable apertures","authors":"Jiwan Kim, Yerin Shim, Wonju Jeon","doi":"10.1016/j.apacoust.2026.111237","DOIUrl":"10.1016/j.apacoust.2026.111237","url":null,"abstract":"<div><div>We propose an acoustic metasurface that achieves low-frequency broadband absorption with tunable target frequencies via mechanically adjustable apertures. The metasurface consists of sub-wavelength Helmholtz resonators, each integrating an aperture into the neck rim without increasing overall thickness. By adjusting aperture closure ratios, geometrical asymmetry between adjacent resonators induces hybrid resonance, yielding perfect absorption. Compared with the design without apertures, the proposed structure lowers resonance frequency and widens bandwidth while maintaining deep sub-wavelength thickness. A theoretical model is developed to calculate the frequency-dependent effective impedance of the metasurface by rigorously accounting for thermo-viscous losses in narrow apertures. This model provides a physics-based framework for selecting aperture closure ratios to ensure impedance matching at arbitrary frequencies. To demonstrate practical feasibility, a metasurface sample with iris-diaphragm-inspired apertures is fabricated using three-dimensional printing, and its absorption performance is experimentally validated using impedance tube measurements. Experimental results confirm perfect absorption at a selected frequency within a tunable range from 400 to 540 Hz. Furthermore, combining multiple unit cells extends the design to broadband absorption, achieving 90% absorption over a one-third octave band (390–485 Hz). Given its compactness and tunability, the metasurface offers an effective solution for low-frequency noise control under dynamically varying spectral conditions.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"246 ","pages":"Article 111237"},"PeriodicalIF":3.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079036","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