Applied Acoustics最新文献_第3页

Multilingual speech emotion recognition using IGRFXG – Ensemble feature selection approach 基于IGRFXG集成特征选择方法的多语言语音情感识别

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-24 DOI: 10.1016/j.apacoust.2025.110905

Astha Tripathi, Poonam Rani

{"title":"Multilingual speech emotion recognition using IGRFXG – Ensemble feature selection approach","authors":"Astha Tripathi, Poonam Rani","doi":"10.1016/j.apacoust.2025.110905","DOIUrl":"10.1016/j.apacoust.2025.110905","url":null,"abstract":"<div><div>In the field of Human–Computer Interaction, it is essential to recognize emotions through speech signals. Selecting the important features from speech signals is crucial to increase the accuracy of machine learning classifiers. Including unnecessary features diminishes model accuracy and increase system complexity. In this study, we propose a novel approach to tackle the feature selection challenge in speech emotion recognition. Our method employs a IGRFXG – ensemble feature selection approach, the name IGRFXG is derived from the three base feature selection techniques it combines: Information gain (IG), Random Forest (RF), and XGBoost (XG), which operates in two stages. In the first stage, to reduce the presence of unnecessary features, we propose an heterogeneous ensemble feature selection technique that integrates three distinct feature selection methods: Information gain, Random Forest and XG Boost. During this stage, we prioritize the features based on their importance score. In the second stage, we intersect the top features selected by various feature selectors and generate a feature kernel. This feature kernel is subsequently passed to machine learning classifiers. The proposed approach is evaluated on four publicly accessible datasets, namely RAVDESS, SUBESCO, EMOVO, and EMODB using six different machine learning classifiers. The performance of the ML models is assessed based on metrics such as accuracy, recall, precision, and F1 score. The performance assessments indicate that the maximum accuracies achieved are 79.28 %, 92.80 %, 95.00 %, and 90.96 % for the RAVDESS, SUBSECO, EMOVO, and EMODB datasets, respectively.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110905"},"PeriodicalIF":3.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365443","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

Improving sound absorption through the filament stringing effect in 3D printed acoustic materials 通过3D打印声学材料的长丝串效应提高吸声效果

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-23 DOI: 10.1016/j.apacoust.2025.110892

Tomasz G. Zieliński , Marco D'Agostini , Andrew Gleadall , Rodolfo Venegas , Paolo Colombo , Giorgia Franchin

{"title":"Improving sound absorption through the filament stringing effect in 3D printed acoustic materials","authors":"Tomasz G. Zieliński , Marco D'Agostini , Andrew Gleadall , Rodolfo Venegas , Paolo Colombo , Giorgia Franchin","doi":"10.1016/j.apacoust.2025.110892","DOIUrl":"10.1016/j.apacoust.2025.110892","url":null,"abstract":"<div><div>This work demonstrates how a well-known malfunction that frequently occurs in material extrusion technologies, known as filament stringing or oozing, can be used to increase the acoustic performance of 3D printed sound absorbing materials. The purpose is first achieved with conventional slicer software by deliberately setting some printing parameters ‘wrong’ to provoke filament stringing. Acoustic materials based on the same original design of narrow slits are 3D printed with retraction enabled or disabled, or using a higher than required printing temperature. The uncontrolled filament stringing that occurs in this way creates fibres in the slits, which ultimately affects the sound absorption measured for these materials. This cannot be ignored in modelling if accurate sound absorption predictions are to be obtained. However, inspired by the uncontrolled stringing, we developed a new concept to print parts with deliberate parametrically adjustable micro-fibre substructures. These are achieved by directly designing innovative toolpaths with recently developed design software (<em>FullControl GCODE Designer</em>), which has never been used previously for sound absorption purposes. The method permits low-cost 3D printers to produce tailored complex acoustic materials with enhanced viscous dissipation effects and improved sound absorption properties. This behaviour is correctly captured by the proposed, experimentally verified, mathematical model of such acoustic composites. The examples presented in the article are also used to discuss some aspects of the reproducibility of acoustic materials 3D printed by extrusion.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110892"},"PeriodicalIF":3.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365081","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

Clocking effect of relative position matching on the hydrodynamic and flow-induced noise characteristics in a centrifugal pump 相对位置匹配对离心泵流体动力和流致噪声特性的时钟效应

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-23 DOI: 10.1016/j.apacoust.2025.110899

Zhicong Wei , Xiaojun Li , Ran Tao , Dawei Sun , Ruofu Xiao , Honglin Hu

{"title":"Clocking effect of relative position matching on the hydrodynamic and flow-induced noise characteristics in a centrifugal pump","authors":"Zhicong Wei , Xiaojun Li , Ran Tao , Dawei Sun , Ruofu Xiao , Honglin Hu","doi":"10.1016/j.apacoust.2025.110899","DOIUrl":"10.1016/j.apacoust.2025.110899","url":null,"abstract":"<div><div>This paper investigates the influence of the clocking effect caused by the relative position matching(RPM) between the rotating and stationary blades in a single-stage centrifugal pump. Numerical simulations are used to study the hydrodynamic performance and flow-induced noise characteristics under different speed configurations. Acoustic predictions are made using the Ffowcs Williams-Hawkings (FW-H) analogy. Experimental validations are carried out for validation. The results indicates that the clocking effect caused by RPM can improve pump hydrodynamic performance and noise characteristics. A non-dimensional parameter describing the clocking effect caused by RPM is proposed, which absolute value shows a significant negative correlation with the pump head and sound pressure. The variation of hydrodynamic performance and noise characteristics among the different <span><math><msub><mi>C</mi><mi>e</mi></msub></math></span> are compared, suggesting that the <span><math><msub><mi>C</mi><mi>e</mi></msub></math></span> is not the only factor and is also affected by the blade tilt angle. The analysis of the flow field indicates that the clocking effect primarily enhances noise reduction by improving the transmission characteristics of pressure fluctuation, and then improves the unsteady surface pressure distribution on the wall of the volute. The above results demonstrate that it is able to achieve the effect of increasing the head and reducing the noise by adjusting the RPM.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110899"},"PeriodicalIF":3.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365080","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

Joint 2D DOA and spectrum estimation of incoherently distributed wideband sources via frequency-domain matching 基于频域匹配的非相干分布宽带源联合二维DOA和频谱估计

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-20 DOI: 10.1016/j.apacoust.2025.110886

Yinian Liang, Fangjiong Chen, Jie Li, Hua Yu, Fei Ji

{"title":"Joint 2D DOA and spectrum estimation of incoherently distributed wideband sources via frequency-domain matching","authors":"Yinian Liang, Fangjiong Chen, Jie Li, Hua Yu, Fei Ji","doi":"10.1016/j.apacoust.2025.110886","DOIUrl":"10.1016/j.apacoust.2025.110886","url":null,"abstract":"<div><div>This paper aims at the problem of joint two-dimensional (2D) direction-of-arrival (DOA) and frequency-spectrum estimation of incoherently distributed wideband (IDW) sources. The typical methods of 2D DOA estimation for distributed sources are based on the narrowband-source assumption and usually require multiple eigenvalue decomposition, followed by exhaustive searching-based pair-matching, which is computationally complicated. In this paper, we extend the existing scheme to wideband sources and propose a simpler pair-matching method based on the frequency-domain parameters including central frequency and frequency spectrum. First, the 2D IDW source estimation problem is decomposed into two one-dimensional (1D) estimation problems by dividing an L-shape array into two orthogonal uniform linear arrays (ULAs) and then estimating the joint angular-frequency distribution (JAFD) matrices through the low-rank recovery method along the two ULAs. We further proposed a pairing scheme to match the individual source estimates from different JAFD matrices based on the fact that the estimated frequency spectrum on the same source is identical. The proposed method achieves a 100% accuracy rate of successful pairing in the 100 Monte-Carlo experiments when signal-to-noise ratio SNR=5 dB, which is higher than the central frequency paired method at least 10%. The root-mean-square-error (RMSE) results based on parametric and real-world source signals also demonstrate the effectiveness of the proposed method comparing with the traditional subspace methods and the central frequency paired method.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110886"},"PeriodicalIF":3.4,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322732","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

Acoustic metamaterial using hollowed star-shaped structure with slits 声学超材料采用中空的带缝隙的星形结构

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-19 DOI: 10.1016/j.apacoust.2025.110893

Yung Boon Chong , Zhenyu Chen , Yapeng Li , Kian Meng Lim , Heow Pueh Lee

{"title":"Acoustic metamaterial using hollowed star-shaped structure with slits","authors":"Yung Boon Chong , Zhenyu Chen , Yapeng Li , Kian Meng Lim , Heow Pueh Lee","doi":"10.1016/j.apacoust.2025.110893","DOIUrl":"10.1016/j.apacoust.2025.110893","url":null,"abstract":"<div><div>Undesirable noise negatively affects quality of life, yet current noise reduction solutions often struggle with low-frequency sounds. Recent interest in acoustic metamaterials stems from their lightweight nature, airflow facilitation, and tunable acoustic bandgaps. Advances in additive manufacturing enable the creation of complex metamaterials more easily. This study investigates a 3D-printed hollow star-shaped structure with slits at each vertex, arranged periodically. The star-shaped structure acts as a Helmholtz resonator due to its air cavities, allowing for effective sound absorption at selected frequency. By leveraging Helmholtz resonance and a hexagonal lattice arrangement, such acoustic metamaterial can control and expand the bandgaps for targeted frequencies. Numerical simulations using finite element methods (FEM) and laboratory experiments were conducted to assess the acoustic performance of this metamaterial. Results showed a significant insertion loss (IL) peak of + 12 dB between 4000 and 5000 Hz, influenced by the orientation of the star-shaped resonators. Acoustic cameras were used to visualize energy flow in and around the metamaterial chamber. Overall, experimental and simulation results demonstrated a strong correlation, highlighting the effectiveness of the star-shaped resonators in noise mitigation.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110893"},"PeriodicalIF":3.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314331","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

Experimental assessment of a programmable Electroacoustic Liner in a representative turbofan facility 可编程电声衬垫在某典型涡扇设备上的试验评估

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-18 DOI: 10.1016/j.apacoust.2025.110896

E. De Bono , E. Salze , M. Collet , M. Gillet , M. Ouisse , M. Volery , H. Lissek , J. Mardjono

{"title":"Experimental assessment of a programmable Electroacoustic Liner in a representative turbofan facility","authors":"E. De Bono , E. Salze , M. Collet , M. Gillet , M. Ouisse , M. Volery , H. Lissek , J. Mardjono","doi":"10.1016/j.apacoust.2025.110896","DOIUrl":"10.1016/j.apacoust.2025.110896","url":null,"abstract":"<div><div>The Flightpath 2050 European Union stringent regulations for aviation noise reduction, along with the new generation of Ultra-High-Bypass-Ratio turbofans to reduce fuel consumption, significantly challenge the scientific community to find unprecedented acoustic liner designs. The SALUTE H2020 project has taken up this challenge, by designing and testing a programmable metasurface made up of electroacoustic resonators. Each electroacoustic resonator is composed by a loudspeaker and four microphones in a compact design, allowing to synthesize tunable local impedance behaviours thanks to a current-driven control strategy. A steel wiremesh mounted onto a perforated plate allows to protect the elctromechanical devices from the aerodynamic disturbances. For the first time, such advanced liner concept has been tested in a scaled turbofan rig: the ECL-B3 PHARE-2 in the Laboratory of Fluid Mechanics and Acoustics of the Ecole Centrale of Lyon. The performances of the electroacoustic liner reported in this paper, correspond to three different regimes: 30%, 40% and 100% of the nominal engine speed. The electroacoustic technology demonstrated robustness faced with a realistic reproduction of actual turbofan conditions, as well as its tunability to target different frequency bandwidth, attaining good radiated noise reduction. The results reported in this experimental campaign open the doors for unprecedented liner designs, by exploiting the huge potentialities of programmable surfaces.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110896"},"PeriodicalIF":3.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306840","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

Vortex-shaped acoustic black holes in rotational arrangement for low-frequency vibration suppression 旋涡状声波黑洞的旋转布置对低频振动的抑制

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-18 DOI: 10.1016/j.apacoust.2025.110862

Taehwan Son, Seongmin Park, Wonju Jeon

{"title":"Vortex-shaped acoustic black holes in rotational arrangement for low-frequency vibration suppression","authors":"Taehwan Son, Seongmin Park, Wonju Jeon","doi":"10.1016/j.apacoust.2025.110862","DOIUrl":"10.1016/j.apacoust.2025.110862","url":null,"abstract":"<div><div>We propose a new design of two-dimensional acoustic black hole (2D ABH) aimed at vibration suppression across low and broadband frequencies. The proposed 2D ABH occupies a circular installation space, with multiple vortex-shaped ABHs arranged rotationally along the circumference, exhibiting a whirlpool-like configuration when viewed from above. Each vortex-shaped ABH is formed by coiling a width-tapered straight ABH along a newly designed spiral profile, intended to accommodate a long ABH for a low cut-on frequency and to guide flexural waves from a host structure to the ABH tip. The proposed 2D ABH is embedded within a plate and suppresses broadband vibrations, reducing the surface-averaged mobility by up to 20 dB in the 60–2000 Hz frequency range. Compared to a conventional 2D ABH with a cut-on frequency of around 60 Hz, the proposed ABH requires less than 2 % of the installation area. By breaking rotational symmetry in the arrangement of the proposed vortex-shaped ABHs, we could further reduce structural vibrations in the plate compared to a rotationally symmetric arrangement.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110862"},"PeriodicalIF":3.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of sound source dominance and pressure level on cognitive performance and environmental perception in green space 声源优势和压力水平对绿色空间认知表现和环境感知的影响

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-17 DOI: 10.1016/j.apacoust.2025.110897

Yingqi Lian , Dayi Ou , Ruochen Tan

{"title":"The effects of sound source dominance and pressure level on cognitive performance and environmental perception in green space","authors":"Yingqi Lian , Dayi Ou , Ruochen Tan","doi":"10.1016/j.apacoust.2025.110897","DOIUrl":"10.1016/j.apacoust.2025.110897","url":null,"abstract":"<div><div>Green spaces are essential for inhabitants, as exposure to them can be beneficial to cognitive performance. This research conducted an outdoor experiment to explore the effects of acoustic environments, including sound pressure level (SPL), sound source dominance (SSD), and their interaction, on cognitive performance and acoustic environmental perception in a green space. Cognitive performances and environmental perceptions of 118 participants were collected under a combination of 3 SPLs (55 dB(A), 60 dB(A), and 65 dB(A)) and 4 SSDs (bird SSD, human chatter SSD, traffic SSD, and construction SSD) and a quiet condition (totaling 13 experimental conditions). Seven cognitive abilities were assessed: memory (M-ability), attention (A-ability), planning (P-ability), spatial (S-ability), attention-memory (AM-ability), planning-memory (PM-ability), and spatial-memory (SM-ability). The results showed that SSD and SPL can significantly affect cognitive performance in green space, with the impacts varying depending on the types of cognitive tasks. Acoustic conditions that improve acoustic environmental perception do not always correspond to better cognitive performance. Under certain SPL conditions, specific types of noise within green spaces can even enhance cognitive performance. Significant interaction effects between SPL and SSD on cognitive performance were observed in tasks related to P-ability and AM-ability. Furthermore, significant interaction effects between SPL and SSD on acoustic environmental perception were noted in terms of acoustic environment comfort (AEC) and soundscape pleasantness (SP). These findings can enhance our understanding of how the acoustic environment influences cognitive performance and acoustic environmental perception in green spaces, providing valuable references for the design and management of acoustic environments in green spaces.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110897"},"PeriodicalIF":3.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297935","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

Transfer–Function–Interpolated Control–Point augmentation for diffuse acoustic field synthesis 扩散声场合成的传递函数插值控制点增强

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-17 DOI: 10.1016/j.apacoust.2025.110895

Haosheng Liu , Bilong Liu , Fengyan An , Andrew Peplow

{"title":"Transfer–Function–Interpolated Control–Point augmentation for diffuse acoustic field synthesis","authors":"Haosheng Liu , Bilong Liu , Fengyan An , Andrew Peplow","doi":"10.1016/j.apacoust.2025.110895","DOIUrl":"10.1016/j.apacoust.2025.110895","url":null,"abstract":"<div><div>In the automotive, aerospace, and architectural acoustics fields, diffuse acoustic fields are employed to assess sound transmission through various materials. In the context of diffuse acoustic field synthesis using loudspeaker arrays, the conventional approach relies on establishing control points within the target area and measuring transfer functions between the loudspeakers and these points to optimize driving signals. This approach, however, guarantees accuracy only at the control points and results in increased errors elsewhere, while also requiring extensive transfer-function measurements. To enhance the global synthesis accuracy and reduce the measurement effort, we propose a statistical pressure-matching method enhanced by control-point augmentation with transfer-function interpolation. The proposed method increases the density of refined control points within the target region and employs a loudspeaker acoustic model to interpolate transfer functions throughout the entire synthesis area. The loudspeaker’s sound radiation is modeled as distinct pairs of monopole sources, positioned at segmented acoustic centers based on amplitude attenuation and phase delay. Experimental validation conducted with a 1D loudspeaker array in an anechoic chamber demonstrates that this approach achieves improved synthesis accuracy across the entire target region compared to traditional control-point-based methods, while substantially reducing the required number of transfer-function measurements.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110895"},"PeriodicalIF":3.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297934","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

Influence of the cavity flexible bottom wall on the self-sustaining oscillation mode 腔体柔性底壁对自持振荡模态的影响

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-06-17 DOI: 10.1016/j.apacoust.2025.110873

Yuan Liu , Peiqing Liu , Hao Guo , Qiulin Qu , Tianxiang Hu , Yifeng Sun , Shujie Jiang

{"title":"Influence of the cavity flexible bottom wall on the self-sustaining oscillation mode","authors":"Yuan Liu , Peiqing Liu , Hao Guo , Qiulin Qu , Tianxiang Hu , Yifeng Sun , Shujie Jiang","doi":"10.1016/j.apacoust.2025.110873","DOIUrl":"10.1016/j.apacoust.2025.110873","url":null,"abstract":"<div><div>Fluid-structure interaction in a cavity affects self-sustained oscillatory flow and noise. The noise and flow field characteristics of cavities with different flexible bottom walls are investigated in a low-speed wind tunnel. The experimental tests include near-field and far-field noise, and the velocity of the shear layer. The elastic modes were varied using different thicknesses of bottom plates so that the cavity self-sustained oscillatory modes interacted with different elastic modes. The noise results of the flexible cavity measured in the experiment are coupled to both acoustic resonance modes and elastic modes. The results show that the coupling of the self-sustained oscillatory and elastic modes increases the sound pressure level of the mode. The flexible wall affects the velocity spectral characteristics of the shear layer as well as the far-field noise, but does not change the vortex-convection velocity dimensionless parameter <span><math><mi>κ</mi></math></span>. When the Rossiter mode is coupled to both acoustic resonance and elastic modes, the excitation of the two coupled modes is characterized by alternating excitation. Finally, the coupled mode frequencies of the elastic and Rossiter modes are accurately predicted based on the calculation of the phase delay term.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"240 ","pages":"Article 110873"},"PeriodicalIF":3.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297932","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