Applied Acoustics最新文献

{"title":"Experimental observation of reflected acoustic beam tilting with temperature in quasi-collinear acousto-optic filters","authors":"Sergey N. Mantsevich ,&nbsp;Ekaterina I. Kostyleva ,&nbsp;Konstantin B. Yushkov ,&nbsp;Vladimir Ya. Molchanov","doi":"10.1016/j.apacoust.2025.110632","DOIUrl":"10.1016/j.apacoust.2025.110632","url":null,"abstract":"<div><div>This paper is devoted to the experimental investigation of temperature influence on the acoustic beam reflection in quasi-collinear acousto-optic (AO) tunable filters, fabricated on the base of paratellurite crystal. Such AO devices apply acoustic beam reflection from the input optical facet in such a way that the reflected beam Poynting vector is collinear to the incident optical radiation wave vector. This allows achieving abnormally high AO interaction length and consequently both high diffraction efficiency and spectral resolution and to realize the multi-frequency diffraction applied for ultrashort laser pulse spectrum and phase control. Due to the acoustic power absorption, the significant heating of AO crystal near the reflecting facet is observed.</div><div>The crystal heating affects the acoustic beam reflection condition through the ultrasound velocity variation and causes the reflected beam tilt from the initially chosen direction. The original method of reflected ultrasound beam structure measurement is proposed. The acoustic beams were visualized for various temperatures in two different quasi-collinear AO filters.</div><div>The temperature variation range typical for the quasi-collinear AO filters in multi-frequency operation causes the beam tilt of about 1-2 degrees, depending on the reflection geometry. The beam tilt influence on the quasi-collinear AO filter transmission functions was also studied. It is shown that the observed tilt significantly affects both the AO diffraction efficiency and the transmission functions, changing their shape and bandwidth.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110632"},"PeriodicalIF":3.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478955","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":"Acoustic analysis and data-driven control of vehicle NVH: A framework for manufacturing process optimization","authors":"Daehun Song ,&nbsp;Seongeun Hong ,&nbsp;Changyong Ha ,&nbsp;Young Eun Song","doi":"10.1016/j.apacoust.2025.110618","DOIUrl":"10.1016/j.apacoust.2025.110618","url":null,"abstract":"<div><div>This study introduces a comprehensive data-driven framework for acoustic analysis and control of noise, vibration, and harshness (NVH) in vehicle manufacturing. By integrating advanced techniques such as Transfer Path Analysis (TPA) and Operational Transfer Path Analysis (OTPA) with big data analytics, the framework systematically identifies and mitigates critical noise and vibration sources across key frequency ranges. Experimental validation demonstrated a 47% reduction in physical testing and a 28% shorter optimization cycle, improving vehicle interior acoustic performance. The proposed approach provides a scalable solution for sustainable NVH management by reducing resource consumption and supporting data-driven decision-making in manufacturing processes. These findings underscore the framework's adaptability to various manufacturing environments and its contribution to advancing efficient NVH optimization practices in modern vehicle design.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110618"},"PeriodicalIF":3.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478954","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":"Estimation of time-varying underwater acoustic channels via an improved sparse adaptive orthogonal matching pursuit algorithm","authors":"Yunfeng Hu ,&nbsp;Jun Tao ,&nbsp;Feng Tong","doi":"10.1016/j.apacoust.2025.110624","DOIUrl":"10.1016/j.apacoust.2025.110624","url":null,"abstract":"<div><div>This paper explores the estimation of time-varying sparse channels for single-carrier underwater acoustic (UWA) communications via dynamic compressed sensing algorithms. In light of existing sparse adaptive orthogonal matching pursuit (SpAdOMP) algorithm, we develop an improved SpAdOMP (I-SpAdOMP) scheme suited for UWA channel estimation. The improvement of I-SpAdOMP channel estimation lies in two aspects: First, an adaptive fuzzy threshold (AFT) strategy is proposed to identify the time-varying channel support set, avoiding the requirement of channel sparsity knowledge by original SpAdOMP scheme. Second, a complex-valued online penalty expectation maximization (OPEM) scheme is employed to estimate channel taps, achieving better accuracy compared with the normalized least mean squares (NLMS) adaptive algorithm used in SpAdOMP. Advantages of the I-SpAdOMP based channel estimation have been verified by experimental data of two at-sea UWA communication trials.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110624"},"PeriodicalIF":3.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474397","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":"Meta-structure underwater transducer with low-frequency broadband efficient acoustic emission","authors":"Yunzhong Lei,&nbsp;Jiu Hui Wu,&nbsp;Shaokun Yang,&nbsp;Tengyue Zheng","doi":"10.1016/j.apacoust.2025.110622","DOIUrl":"10.1016/j.apacoust.2025.110622","url":null,"abstract":"<div><div>It is difficult for traditional underwater acoustic emission transducers to possess low-frequency, broadband and high-efficiency characteristics simultaneously. In this paper, we propose a novel kind of <em>meta</em>-structure underwater transducer with its cover composed of a circular plate, ribs and additional mass units, and reveal the mechanisms of local resonance efficient acoustic emission and synergistic coupling broadband acoustic emission. The genetic algorithm (GA) is adopted to optimize the parameters of the <em>meta</em>-structure cover, and the low-frequency broadband efficient underwater acoustic emission with the sound pressure level (SPL) fluctuation of 6 dB in 100–2500 Hz is realized. Subsequently, the radial magnetic circuit is used as the driving device, and the prototype of the <em>meta</em>-structure underwater acoustic transducer is developed. The experimental results confirm the acoustic emission performance of the prototype, which is expected to show significant potential in long-range underwater acoustic communication.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110622"},"PeriodicalIF":3.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464703","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":"Fuzzy dispersion entropy-based Lempel-Ziv complexity and its multiscale version for measuring the complexity of time series","authors":"Yuxing Li ,&nbsp;Yang Liu ,&nbsp;Xiang Gao","doi":"10.1016/j.apacoust.2025.110620","DOIUrl":"10.1016/j.apacoust.2025.110620","url":null,"abstract":"<div><div>Lempel-Ziv complexity (LZC) has important significance in nonlinear science as a measure of time series complexity. The previously proposed dispersion entropy-based Lempel-Ziv complexity (DELZC) effectively improves the performance of traditional LZC, but it still has problems such as information loss and inaccurate complexity characterization. To overcome these limitations, fuzzy dispersion entropy-based Lempel-Ziv complexity (FDELZC) is proposed, which utilizes fuzzy function to obtain accurate pattern partitioning and the accurate pattern information makes the symbol information more accurate, the result is a more accurate complexity characterization for signals. Furthermore, FDELZC is extended to multiscale fuzzy dispersion entropy-based Lempel-Ziv complexity (MFDELZC), which characterizes the sequence complexity information from different scales. Three sets of simulation signal experiments show that FDELZC can effectively captures dynamic time series changes, and has good anti-interference and differentiation ability. Two sets of real-world signal experiments demonstrate the significant advantage of FDELZC over LZC, PLZC, DLZC, and DELZC in distinguishing real-world hydroacoustic signals.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110620"},"PeriodicalIF":3.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464741","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":"Vibroacoustic optimization of electric motors taking advantages of viscoelastic resins","authors":"Émeline Sadoulet-Reboul ,&nbsp;Kévin Jaboviste ,&nbsp;Morvan Ouisse ,&nbsp;Adrien Parpinel ,&nbsp;Pascal Bouvet ,&nbsp;Fabien Maugan ,&nbsp;Christophe Espanet","doi":"10.1016/j.apacoust.2025.110600","DOIUrl":"10.1016/j.apacoust.2025.110600","url":null,"abstract":"<div><div>Electric drivelines are the source of tonal noise which can be particularly unpleasant in many industrial settings, and in particular in vehicles. Different approaches are investigated to minimize this phenomenon, based on the control of the electromagnetic source for example, or on the optimization of the structural design. This paper introduces a framework allowing time-efficient reduction of noise radiation without affecting electromagnetic performance of electric motors, based on the combination of reduced order model and optimization of viscoelastic properties of potting resins. Although viscoelastic resins are frequently used in electric motors, they are primarily used for insulation, protection, and mechanical stability. The originality of this work is to endow them with a new functionality by dimensioning them in such a way as to reduce acoustic radiation. Indeed, the elastodynamic properties of resins depend on the frequency and on the temperature, and can be optimized to reduce the vibrations and thus the radiated noise. The design is complex because it involves coupled multiphysical phenomena that cannot be considered separately, and because the numerical models considered are large-scale models. A methodology is proposed in this paper and applied to the case of a high-speed electric motor. To guarantee fast and accurate estimation of the acoustic power in the optimization process, a reduced order model of the engine is developed from a multi-model basis taking into account the thermal and frequency dependencies of the materials. The numerical optimization thus carried out allows to identify the optimal resin properties, and a motor is coated to experimentally validate the results. Experimental characterization thus confirms that the radiated noise can be considerably reduced by using a suitable resin. This work opens the way to a new design strategy for electric motors providing resin coating with an acoustic function.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110600"},"PeriodicalIF":3.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464702","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":"Empirical formulas for the prediction of the diffraction field around rigid, absorbing, single or multiple wedges","authors":"Penelope Menounou,&nbsp;Sotirios Salagas,&nbsp;Petros Nikolaou","doi":"10.1016/j.apacoust.2025.110592","DOIUrl":"10.1016/j.apacoust.2025.110592","url":null,"abstract":"<div><div>The diffraction field around infinitely long wedges is investigated. Empirical formulas are derived based on a recently published approximate analytical diffraction solution. Empirical formulas reduce drastically the time required for the evaluation of the diffracted field compared to analytical solutions. Empirical formulas can, therefore, be of practical interest in cases of complex geometries with many diffracting edges. Compared to existing empirical formulas they provide increased accuracy, greater computational speed, and a wider range of applicability. Specifically, unlike existing empirical formulas, the proposed formulas can be applied: (i) to all wedge angles, (ii) to all receiver locations, and (iii) for all three types of simple sound sources: plane wave sources, line sources or point sources, both omni-directional and directional. Furthermore, they can be applied to low frequencies, a characteristic that is unique to the best of the authors’ knowledge. For low frequencies, their validity is limited to the cases where the distances of the source and the receiver from the edge differ by at least one order of magnitude. The suggested empirical formulas are incorporated into appropriate analytical models and can be applied to absorbing wedges and to diffraction by multiple wedges. Finally, good agreement is shown with published experimental data and numerical results for: (i) rigid or absorbing wedges, (ii) multiple rigid wedges, (iii) multiple absorbing wedges, and (iv) wedges with mixed surfaces (rigid /absorbing).</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110592"},"PeriodicalIF":3.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464701","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":"CAS-TJ: Channel attention shuffle and temporal jigsaw for audio classification","authors":"Yongmin Kim,&nbsp;Kyungdeuk Ko,&nbsp;Junyeop Lee,&nbsp;Hanseok Ko","doi":"10.1016/j.apacoust.2025.110590","DOIUrl":"10.1016/j.apacoust.2025.110590","url":null,"abstract":"<div><div>Audio classification, including speech emotion, has been a topic of extensive research and applies to various virtual assistants and intelligent systems. Previous methods relied on handcrafted features such as spectrograms, but these features often have limitations due to their manual nature. Recently, hybrid models that use both end-to-end learning from raw audio with CNNs and Transformers have been developed to address this issue. However, when raw audio features are compressed through convolutional neural networks (CNNs), numerous channels are created, leading to redundancy or irrelevant information, while Transformers also have their limitations. Therefore, we propose Channel Attention Shuffle and Temporal Jigsaw (CAS-TJ) to generate more effective features and improve robustness. CAS divides channels into groups, multiplies them by attention weights, aggregates, and shuffles them. This process allows information to be exchanged among various channels, creating more discriminative channels. TJ generates frame patches of a specific size and uses mixing and matching during the learning process. This helps to better understand temporal relationships and detect discriminative patterns. Finally, we conduct experiments on the ESC-50 and Urban-8k datasets and find that the overall performance of CAS-TJ is better than the baseline models.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110590"},"PeriodicalIF":3.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453053","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":"Low-frequency topological edge and corner states in metamaterial sandwich plates","authors":"Hanqing Zhang ,&nbsp;Yingli Li ,&nbsp;Song Yao ,&nbsp;Yong Peng","doi":"10.1016/j.apacoust.2025.110603","DOIUrl":"10.1016/j.apacoust.2025.110603","url":null,"abstract":"<div><div>Recently, topological edge and corner states have attracted significant attention for their unprecedented wave manipulation capabilities. However, most existing advancements in elastic topological wave manipulation have been achieved in metamaterial monolayer plates, operating at high frequencies, which limits their practical applicability. To achieve low-frequency topological edge and corner states, this study presents an innovative topological metamaterial sandwich plate with compression-torsion coupling cores. Mimicking quantum valley Hall effect (QVHE), the gapless topological edge states are achieved by mismatching the sizes of two sandwich cores in C_3v-symmetric rhombic unit cell. To realize higher-order topological corner states, the C_6v-symmetric hexagonal unit cell is constructed by doubling rhombic unit cells. Leveraging quantum spin Hall effect (QSHE), gapped edge states are achieved, laying a critical foundation for the emergence of topological corner states. Eigenstate analysis of rhombic and square lattices presents that corner states can exist at both obtuse and acute angles. Symmetrical topological corner states and anti-symmetrical trivial corner states are observed, with the former being defect-immune. Transmission experiments demonstrate that vibration can be suppressed within the bulk and localized at the edges and corners, validating the presence of edge and corner states. This study could facilitate the development of elastic topological metamaterials and their application in vibration control, energy harvesting, signal sensing, etc.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110603"},"PeriodicalIF":3.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453033","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 method for extracting an average scattering coefficient for room acoustic modeling","authors":"Dingding Xie ,&nbsp;Wouter Wittebol ,&nbsp;Qi Li ,&nbsp;Maarten Hornikx","doi":"10.1016/j.apacoust.2025.110604","DOIUrl":"10.1016/j.apacoust.2025.110604","url":null,"abstract":"<div><div>This work introduces frequency-dependent Average Scattering Coefficients (ASCs) to quantify the room-averaged degree of scattering per mean free path that results from sound wave interactions with objects, elements, and impedance discontinuities. In this work, the sound field of a room is decomposed into two components: (1) specular reflections from boundary surfaces and (2) non-specular component by the room's interiors and elements. Time-dependent coherence coefficients extracted from impulse responses of furnished rooms and their empty averages are used to derive ASCs, which can be used to facilitate the transition from a specular to a non-specular component in room acoustical modeling. This study extracts ASCs in rooms with varying amounts, distributions, and absorptions of interior elements, and different source and receiver positions based on a wave-based solver. Moreover, ASCs are measured in a real furnished room and utilized to reconstruct the measured sound field with a hybrid model. The specular component is calculated from the empty room case, while the non-specular component is modeled with a stochastic technique. Results from the hybrid models show strong agreement with ground truth regarding early decay time, reverberation time, the degree of scattering, and the level of diffuseness, demonstrating the potential of ASCs for high-frequency room acoustic modeling with reduced computational resources.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110604"},"PeriodicalIF":3.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}