Applied Acoustics最新文献_第8页

Vibro-acoustic-modulation pseudo-force spectrum: A new concept for localizing “breathing” debondings in laminated beams 振动声调制伪力谱：层合梁“呼吸”脱粘的新概念

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-08 DOI: 10.1016/j.apacoust.2025.110762

Wang Xiao , Yuchen Yang , Maosen Cao , Jianping Zhou , Wei Xu , Zhongqing Su , Wiesław Ostachowicz

{"title":"Vibro-acoustic-modulation pseudo-force spectrum: A new concept for localizing “breathing” debondings in laminated beams","authors":"Wang Xiao , Yuchen Yang , Maosen Cao , Jianping Zhou , Wei Xu , Zhongqing Su , Wiesław Ostachowicz","doi":"10.1016/j.apacoust.2025.110762","DOIUrl":"10.1016/j.apacoust.2025.110762","url":null,"abstract":"<div><div>Laminated beams, although extensively utilized in engineering structures, are vulnerable to local debondings. When subjected to a vibro-acoustic excitation, the opening-closing motion of a “breathing” debonding generates contact-induced nonlinearity. Such nonlinearity allows for manifesting the presence and evaluating the extent of debonding by sideband harmonics, known as the vibro-acoustic modulation (VAM) technique. To further sharpen the capability of the VAM technique in localizing debondings, this study incorporates the emerging concept of nonlinear pseudo-force (NPF) into the VAM technique, producing a new concept of VAM pseudo-force spectrum (VAM-PFS). As NPFs exist exclusively within debonding regions, the VAM-PFS built on a group of NPFs linked to the neighboring sideband harmonics can serve as an ideal indicator for localizing debondings. Notably, the NPFs are reconstructed directly from operating deflection shapes (ODSs) associated with the sideband harmonics, eliminating the need for prior knowledge of material and structural parameters. Additionally, to suppress interference in the VAM-PFS from measurement noise, multiscale analysis is applied to the measured sideband ODSs. The VAM-PFS is numerically proven using the finite element method, and its applicability is experimentally validated on steel laminated beams with through-width debondings, whose sideband ODSs are measured via laser scanning using a scanning laser vibrometer. The results demonstrate that VAM-PFSs are ideal indicators to manifest the presence of “breathing” debondings and characterize their locations and sizes.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110762"},"PeriodicalIF":3.4,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923450","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

Incorporating extended neck Helmholtz resonators into an advanced multi-degree of freedom acoustic metamaterial for low-frequency, broadband acoustic absorption 将扩展颈亥姆霍兹谐振器集成到先进的多自由度声学超材料中，用于低频宽带声吸收

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-07 DOI: 10.1016/j.apacoust.2025.110750

Jiayu Wang, Gareth J. Bennett

{"title":"Incorporating extended neck Helmholtz resonators into an advanced multi-degree of freedom acoustic metamaterial for low-frequency, broadband acoustic absorption","authors":"Jiayu Wang, Gareth J. Bennett","doi":"10.1016/j.apacoust.2025.110750","DOIUrl":"10.1016/j.apacoust.2025.110750","url":null,"abstract":"<div><div>This study investigates the novel design and evaluation of a low-frequency, broadband, noise-absorbing acoustic metamaterial. The technology combines the sound-absorbing characteristics of micro-perforated panels with extended neck Helmholtz resonators. Individual sub-chambers can have unique properties such as depth, porosity, hole diameter, extended neck length, and neck internal diameter. An optimisation algorithm is implemented to ensure that broadband absorption is maximised in a low-frequency range of interest. The Helmholtz resonators couple with the response of the micro-perforated panels so that the combined response is both more broadband and of lower frequency than could be attained by the elements individually. Low frequencies below 500 Hz are of interest in the study, and the area exposed to the sound field is limited to 0.04 m<sup>2</sup>, so the technology is considered to be a locally reacting absorber. Experimental results indicate that perfect sound absorption of over 99.9% at 329.6 Hz with a 51 mm thickness (sub-wavelength ratio = 1/20.4) can be achieved with one configuration, which emphasises maximum absorption. A second configuration, which emphasises broadband absorption, achieves an average sound absorption coefficient of 0.8 in the 254 Hz to 500 Hz range. Experimental results compare well with analytical and numerical results and outperform some results found in the literature.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110750"},"PeriodicalIF":3.4,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918542","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

Calculation method with experimental validation of underwater acoustic radiation of composite laminate structures 复合材料层合结构水声辐射的实验验证计算方法

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-06 DOI: 10.1016/j.apacoust.2025.110798

Ling-Wen Jiang , Ming-Song Zou , Yadong Zhou , Wentao Guo

{"title":"Calculation method with experimental validation of underwater acoustic radiation of composite laminate structures","authors":"Ling-Wen Jiang , Ming-Song Zou , Yadong Zhou , Wentao Guo","doi":"10.1016/j.apacoust.2025.110798","DOIUrl":"10.1016/j.apacoust.2025.110798","url":null,"abstract":"<div><div>Enhancing the acoustic radiation performance of typical composite structural parts of underwater vehicles is crucial for reducing the risk of acoustic detection and improving low-noise capabilities. This paper conducts an in-depth exploration of the acoustic radiation characteristics of composite laminate structures and introduces a numerical simulation method based on the three-dimensional (3D) sonoelasticity theory. The study analyzes and evaluates the underwater acoustic radiation of composite laminates by combining calculation method and experimentation. First, we use finite element method (FEM) to perform dynamic modeling and modal analysis of the typical laminates. The composite plate is modeled by defining the ply angle of each layer with shell elements, in order to obtain their natural frequencies and vibration modes with satisfactory calculation accuracy and efficiency. Subsequently, we use the 3D sonoelastic analysis software THAFTS-Acoustic to perform a detailed analysis of the acoustic radiation characteristics. To form a closed surface of the wet elements, a cuboid box is proposed to model the wet surface in present method. The results for the composite cylindrical shell demonstrate the good agreement of present method with the reference solution. Lastly, this paper compares the experimental results of underwater acoustic radiation of composite laminates with numerical simulation data. The calculated and experimental sound pressure level (SPL) curves are consistent in the 20–420 Hz, with differences of maximum and total SPL at each measuring point within 3 dB. This further validates the proposed numerical method. In summary, the paper proposes a numerical method for the acoustic radiation of typical composite structures, providing a scientific basis for the low-noise design of new composite materials in marine engineering equipment.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110798"},"PeriodicalIF":3.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911771","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

Medium to high intensity super-resolution focused ultrasound constructed by hyperbolic-superimposed binary phase modulation 双曲叠加二元相位调制构造的中高强度超分辨聚焦超声

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-06 DOI: 10.1016/j.apacoust.2025.110778

Yujin Liu , Zhentian Liu , Wei Yue , Qinyi Wang , Gepu Guo , Yuzhi Li , Qingyu Ma

{"title":"Medium to high intensity super-resolution focused ultrasound constructed by hyperbolic-superimposed binary phase modulation","authors":"Yujin Liu , Zhentian Liu , Wei Yue , Qinyi Wang , Gepu Guo , Yuzhi Li , Qingyu Ma","doi":"10.1016/j.apacoust.2025.110778","DOIUrl":"10.1016/j.apacoust.2025.110778","url":null,"abstract":"<div><div>Super-oscillatory phenomenon, essential for breaking the diffraction limit, often trades huge side-bands for a super-resolution focus. In this study, the hyperbolic-superimposed binary phase modulation method is introduced to achieve medium to high intensity super-resolution focused ultrasound in water at ∼ MHz frequencies. Utilizing the summarized system transmission function, the hyperbolic-superimposed binary phase lens is designed and optimized by considering the mutually dependent parameters of the full width at half maximum (FWHM) and side lobe to peak ratio (SLPR). The influence of excitation frequency on focal length and super-resolution performance is further analyzed, achieving a focal spot with FWHM of 0.42 λ/NA, SLPR of 44 %, and pressure gain of 17.8, along with a flexibly adjustable focal length from 30 to 70 mm within 0.8–1.2 MHz. The flexibility and robustness of the proposed method are validated by the super-resolution imaging and the particle manipulation, paving the way for new breakthroughs in high-precision ultrasonic diagnosis and treatment.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110778"},"PeriodicalIF":3.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911772","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 of an UWA-OTFS communication receiver based on single-element two-dimensional virtual passive reversal 基于单元件二维虚拟无源反转的UWA-OTFS通信接收机设计

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-06 DOI: 10.1016/j.apacoust.2025.110790

Yang Yang , Lu Ma , Boon-Chong Seet , Songzuo Liu , Siang Ma

{"title":"Design of an UWA-OTFS communication receiver based on single-element two-dimensional virtual passive reversal","authors":"Yang Yang , Lu Ma , Boon-Chong Seet , Songzuo Liu , Siang Ma","doi":"10.1016/j.apacoust.2025.110790","DOIUrl":"10.1016/j.apacoust.2025.110790","url":null,"abstract":"<div><div>Orthogonal Time Frequency Space (OTFS) modulation offers a novel solution to enhance the reliability of mobile underwater acoustic (UWA) communication systems. In this study, a receiver architecture tailored for UWA-OTFS communication is presented, leveraging single-element two-dimensional virtual passive reversal (2D-VPR) technology in the delay-Doppler (DD) domain. To enhance the concentration of main lobe energy in the equivalent channel after 2D-VPR equalization, a block orthogonal matching pursuit with dynamic power weighting (BOMP-DPW) channel estimator is proposed, resulting in an order-of-magnitude reduction in the communication system's raw bit error rate (BER). Furthermore, considering the impact of signal distortion and noise, the 2D-VPR processor driven by the BOMP-DPW estimator is coupled with a minimum mean square error (MMSE) equalizer to further suppress sidelobe interference and noise. The proposed scheme was tested in the South China Sea, where data processing results confirmed that the receiver achieved reliable communication within a frequency band of <span><math><mn>2</mn><mo>−</mo><mn>4</mn></math></span> kHz, a data rate of 1.8 kbps, a maximum towing distance of 5 km, and a relative speed of 2 m/s between the transmitter and receiver.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110790"},"PeriodicalIF":3.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911770","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

Improved Bayesian regularization of inverse problems in vibrations and acoustics using noise-only measurements 改进贝叶斯正则化反问题的振动和声学使用噪声测量

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-05 DOI: 10.1016/j.apacoust.2025.110756

Keaton Coletti , R. Benjamin Davis , Ryan Schultz

{"title":"Improved Bayesian regularization of inverse problems in vibrations and acoustics using noise-only measurements","authors":"Keaton Coletti , R. Benjamin Davis , Ryan Schultz","doi":"10.1016/j.apacoust.2025.110756","DOIUrl":"10.1016/j.apacoust.2025.110756","url":null,"abstract":"<div><div>This paper studies Tikhonov regularization (ridge regression) parameter selection for problems in vibrations and acoustics. The selection method is based on a popular Bayesian method, but it incorporates measurements of sensor noise. The regularization parameter is closely related to the ratio of system input energy to noise energy, so noise measurements inform the inference procedure and improve parameter identification. In cases where standard Bayesian regularization identifies zero as the optimal regularization parameter, noise measurements guarantee a unique nonzero optimum. Sufficient theoretical criteria are developed for this guarantee. The method is verified in even-determined and under-determined configurations in an acoustic source localization simulation and a vibration load identification experiment. It is shown to yield significant improvements over existing empirical Bayesian regularization. Improvements are larger in the even-determined case and smaller in the under-determined case, wherein the inverse solution is less sensitive to the regularization parameter.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110756"},"PeriodicalIF":3.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903400","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 sound radiated by tip clearances submerged in a boundary layer 淹没在边界层中的尖端间隙所辐射的声音

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-05 DOI: 10.1016/j.apacoust.2025.110741

Manuj Awasthi , Danielle Moreau , Paul Croaker , Paul Dylejko

{"title":"The sound radiated by tip clearances submerged in a boundary layer","authors":"Manuj Awasthi , Danielle Moreau , Paul Croaker , Paul Dylejko","doi":"10.1016/j.apacoust.2025.110741","DOIUrl":"10.1016/j.apacoust.2025.110741","url":null,"abstract":"<div><div>The present study investigates the behaviour of the far-field sound radiated by low Mach number tip clearance flow induced by placing a stationary cambered airfoil adjacent to a stationary wall. The tip clearance heights ranged from 14% to 30% of the incoming, undisturbed boundary layer thickness and the clearance heights based Reynolds numbers were between 2,600 and 16,000. The far-field sound measured using a microphone array was beamformed to reveal the dominant noise sources and how they behave when the flow Mach number, angle of attack and the clearance height were varied. The near-field behaviour was also examined through PIV measurements and surface pressure fluctuation measurements on the tip. The results show that the mid-to-high frequency noise generated by tip clearances is dominated by the leakage flow in the mid-chord and leading-edge regions, while a distinct low-frequency noise source with a different scaling behaviour exists close to the trailing-edge of the tip clearance. The origin of this low-frequency noise source is believed to be the tip separation vortex that resides close to the trailing-edge and induces significant turbulence levels in the region. The strength of this noise source decreases with clearance height which is consistent with a reduction in turbulence levels associated with the separation vortex. The magnitude of the mid-frequency clearance noise which scales with the sixth power of the Mach number, decreases with tip clearance height due to a reduction in the fluctuating pressure on the airfoil tip surface. The time-scale of this sound was independent of the flow velocity, implying that the source is non-compact. Smaller tip clearances were also found to generate louder high-frequency noise due to intense turbulence and pressure fluctuation levels concentrated near the leading-edge of the clearance.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110741"},"PeriodicalIF":3.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903398","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 role of windows in sonic boom indoor transmission 窗在音爆室内传播中的作用

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-05 DOI: 10.1016/j.apacoust.2025.110746

A.A. Valishina, L.R. Gareev, K.A. Zhidyaev, V.V. Vedeneev

引用次数: 0

A least squares based optimization method for grating lobes suppression in parametric array loudspeakers 基于最小二乘的参数阵列扬声器光栅瓣抑制优化方法

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-02 DOI: 10.1016/j.apacoust.2025.110757

Fengyi Fan , Yunxi Zhu , Wenyao Ma , Liwen Qin , Ming Wu , Zheng Kuang , Jun Yang

{"title":"A least squares based optimization method for grating lobes suppression in parametric array loudspeakers","authors":"Fengyi Fan , Yunxi Zhu , Wenyao Ma , Liwen Qin , Ming Wu , Zheng Kuang , Jun Yang","doi":"10.1016/j.apacoust.2025.110757","DOIUrl":"10.1016/j.apacoust.2025.110757","url":null,"abstract":"<div><div>The Parametric Array Loudspeaker (PAL) is a highly directional sound source with a small aperture. By using phased array technology, PALs can achieve sound beam steering without mechanically rotating the source. However, a challenge arises due to the ultrasonic wavelength being typically smaller than the size of the transducers, which violates the spatial Nyquist criterion and leads to the formation of unwanted grating lobes in the radiation pattern. To address this issue, this paper employs a complex weighting scheme that incorporates both element amplitude and phase shifts, effectively suppressing the grating lobes for given element positions while allowing for a compact configuration. The matrix formulation of the PAL convolution model is provided, and a least squares (LS) optimization method is proposed to obtain the optimal complex weights. Simulation and experimental results demonstrate that the LS-based optimization effectively mitigates the grating lobes of the steerable PAL, resulting in significantly reduced computation time, enabling real-time calculation of the required element weights for steering. Compared to conventional simulated annealing algorithms, the proposed method achieves a 2300-fold acceleration in computational efficiency, enabling real-time beamforming in dynamic scenarios. Additionally, the paper analyzes the impact of the number of array elements, carrier frequency, and audio frequency on PAL grating lobes behavior. The analysis reveals the existence of beam steering blind spots where grating lobe suppression is difficult to achieve.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"237 ","pages":"Article 110757"},"PeriodicalIF":3.4,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895824","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

On the nonlinear low-frequency sound absorption performance of Helmholtz resonators with spiral neck 螺旋颈亥姆霍兹谐振器的非线性低频吸声性能

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-02 DOI: 10.1016/j.apacoust.2025.110765

Zhanzhi Li , Qianwen Yang , Yan Lu , Mingmin Chen , Xiaopei Liu , Dong Yang , Min Zhu

{"title":"On the nonlinear low-frequency sound absorption performance of Helmholtz resonators with spiral neck","authors":"Zhanzhi Li , Qianwen Yang , Yan Lu , Mingmin Chen , Xiaopei Liu , Dong Yang , Min Zhu","doi":"10.1016/j.apacoust.2025.110765","DOIUrl":"10.1016/j.apacoust.2025.110765","url":null,"abstract":"<div><div>This paper focuses on improving the sound absorption performance of Helmholtz resonators at low frequencies by optimizing its neck structure with a given limited cavity volume. It is found that the design of incorporating a spiral baffle at the neck can greatly utilize the neck space and effectively improve the low-frequency sound absorption performance. An impedance model based on the effective length and cross-sectional area of the neck is developed and good predictions on the sound absorption performance against the experimental results are achieved. Both the linear and nonlinear resistances are modeled and validated against experimental results. Notably, under higher sound pressure levels (in the nonlinear region), the HR with spiral neck structure could maintain a more robust sound absorption performance compared to the HR with a traditional orifice neck or an extended orifice neck. This includes both a larger peak sound absorption coefficient and a smaller deviation of the resonance frequency at higher sound pressure levels. The theoretical model is finally used to optimize the spiral neck structure parameters and the results are validated by experimental measurements.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"237 ","pages":"Article 110765"},"PeriodicalIF":3.4,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895825","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