Applied Acoustics最新文献

{"title":"Dynamic modeling and optimization method for large amplitude ultrasonic osteotome for surgical robots","authors":"Linwei Wang ,&nbsp;Faming Zhang ,&nbsp;Ming Yan ,&nbsp;Yu Liu","doi":"10.1016/j.apacoust.2025.110694","DOIUrl":"10.1016/j.apacoust.2025.110694","url":null,"abstract":"<div><div>The current clinical application of ultrasonic osteotomes is mainly aimed at use by surgeons, with a lightweight design and small amplitude that limit the ability to fully utilize the advantages of surgical robots, such as load capacity, repetitive accuracy, and overall functionality. The cutting efficiency of traditional small-amplitude ultrasonic osteotomes is relatively low, making them mainly suitable for localized cutting of bone tissue with a thickness of less than 3 mm. To improve the clinical efficacy of ultrasonic osteotomes, this paper introduces a large-amplitude ultrasonic osteotome designed for surgical robots and establishes a corresponding dynamic model. Utilizing the boundary conditions of freedom at both ends and the continuity conditions of displacement and elastic force at each connection, we derive the longitudinal vibration frequency equation and an analysis formula for vibration modes. The dynamic model of the ultrasonic osteotome proposed in this paper serves as the foundation for optimization design and provides a mathematical modeling method that quantitatively describes the resonant frequency and vibration displacement characteristics of the ultrasonic osteotome without the need for complex and time-consuming numerical calculations, such as finite element analysis. A multi-objective optimization model for the ultrasonic osteotome was subsequently developed based on the dynamic model, and the optimal solution was derived using the three-stage method outlined in this paper. The feasibility of this dynamic modeling and optimization method for ultrasonic osteotomes in surgical robotic applications was verified by comparing the vibration characteristics and cutting performance of the ultrasonic osteotome before and after optimization through simulation analysis, performance testing, and cutting experiments. The results of this research provide novel design ideas and performance optimization methods for the application of ultrasonic osteotomes in the field of surgical robots, with the potential to establish a comprehensive design system for ultrasonic orthopedic surgical instruments.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110694"},"PeriodicalIF":3.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686852","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":"Flexural-wave dual bandgaps in elastic metamaterial beam based on L-shaped local resonators","authors":"Jian Zhu ,&nbsp;Rui Zhang ,&nbsp;Kaixiang Wang,&nbsp;Lang Zheng,&nbsp;Tianning Chen,&nbsp;Wei Ding","doi":"10.1016/j.apacoust.2025.110692","DOIUrl":"10.1016/j.apacoust.2025.110692","url":null,"abstract":"<div><div>For achieving multiple bandgaps, a general strategy is to connect single-degree-of-freedom (DOF) resonators in series to form a unit cell with multiple DOF resonators, thus causing a massive and bulky system. This study proposes an L-shaped local resonator attached to a beam to create multiple bandgaps for achieving broadband vibration isolation by utilizing the higher-order eigenmodes of the local resonator. The theoretical model based on the spectral element method (SEM) is developed to investigate the vibration attenuation property of the metamaterial beam. The theoretical and numerical transmissions of finite-length metamaterial beams are calculated and demonstrated by the experiment. The theoretical, numerical, and experimental results demonstrate that, compared to the conventional strategy, the L-shaped resonator can realize multi-bandgaps as well with lighter mass and smaller dimensions. In addition, we investigated the effects of the structural parameters of the L-shaped local resonator on the bandgap and designed a gradient metamaterial beam to obtain a broader vibration attenuation range by special combinations. The L-shaped local resonator proposed in this paper provides a promising solution for lightweight broadband vibration isolation.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110692"},"PeriodicalIF":3.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686850","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":"Broadband sound absorption and slow wave in truncated sonic black hole","authors":"Yong-Hua Yu ,&nbsp;Weichun Huang ,&nbsp;Long-Xiang Xie ,&nbsp;Zhi-Han Li ,&nbsp;Xing Li ,&nbsp;Ming-Hui Lu","doi":"10.1016/j.apacoust.2025.110677","DOIUrl":"10.1016/j.apacoust.2025.110677","url":null,"abstract":"<div><div>The sonic black hole (SBH) exhibits significant potential for trapping and dissipating acoustic waves. In this article, we propose a truncated-tail SBH (TSBH) composed of 20-unit cells, with heights increasing according to an exponential law. The truncated-tail SBH enhances low-frequency absorption peaks below the first-order cut-on frequency by promoting global resonance along the entire length of the structure. This results in an expansion of the sound absorption bandwidth towards lower frequencies, while maintaining the overall structural length. At low frequencies, the high-quality factors of resonance impede the formation of broadband sound absorption peaks. To address this, porous materials are integrated into the unit cells, effectively mitigating the inherent radiation leakage at frequency below 850 Hz. This approach significantly enhances sound absorption in the low-frequency range, ensuring better energy dissipation and addressing the challenges posed by strong dispersion effects in this regime. Slow wave phenomena are also observed in the same frequency range by calculating the effective bulk modulus and sound speed. Test samples are manufactured using 3D printing and tested in a square cross-section impedance tube. An average sound absorption coefficient greater than 80 % is measured over a broadband range from 250 to 1700 Hz with a structure thickness of 100 mm. The proposed slow sound theory and the properties of truncated SBH with added porous materials may pave the way for perfectly absorbing SBH, potentially broadening its application.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110677"},"PeriodicalIF":3.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686848","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":"Double sonic boom of an aerial bomb and a ballistic missile","authors":"Rufin Makarewicz","doi":"10.1016/j.apacoust.2025.110675","DOIUrl":"10.1016/j.apacoust.2025.110675","url":null,"abstract":"<div><div>Acceleration during the supersonic descent of an aerial bomb or a ballistic missile in the atmosphere is considered. On the ground, inside the circle of radius <span><math><msub><mi>r</mi><mrow><mi>max</mi></mrow></msub></math></span> with its center at the target, an explosion and double sonic boom are recorded. Outside this circle only the explosion is heard. The time gaps between the sonic booms and the explosion are calculated. Drag force and refraction are taken into account.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110675"},"PeriodicalIF":3.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686849","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":"Sound source localization in a natural soundscape with autonomous recorder units based on a new time-difference-of-arrival algorithm","authors":"Laurent Lellouch,&nbsp;Sylvain Haupert,&nbsp;Jérôme Sueur","doi":"10.1016/j.apacoust.2025.110648","DOIUrl":"10.1016/j.apacoust.2025.110648","url":null,"abstract":"<div><div>Acoustic sound source localization is an emerging approach in animal behavior and ecology to either monitor individuals or to describe the spatial and temporal structure of natural soundscapes. The localization of sound sources mainly rely on the deployment in the field of microphone arrays and on the subsequent pairwise comparison of signals to infer position through triangulation. However, most of the current methods face the challenge of separating or not the sound sources before estimating their spatial position. On the one hand, source localization with upstream separation is particularly challenging in noisy outdoor environments. On the other hand, no-separation sound source localization can be possible only when calling rates are low. Here, using four outdoor low-cost recorders, we propose a new method which is an intermediate between the separation and no-separation strategies. Our deterministic algorithm combines a rough call separation, the computation and self-consistency check of time difference of arrivals, the separation or aggregation of sound sources, the localization of the sources in Cartesian or polar coordinates, and the final identification by an expert. We tested this method on a 190 min soundscape recording achieved in a temperate freshwater environment. The automated analysis revealed the space and time pattern of an amphibian, avian and human complex soundscape. This procedure opens the possibility to deploy similar passive acoustic programs to monitor either predetermined individuals or the composition of dynamic soundscapes.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110648"},"PeriodicalIF":3.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686846","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}

{"title":"Characterization and warning criteria of metro rail corrugation based on vibration and noise data fusion","authors":"Yang Wang ,&nbsp;Hong Xiao ,&nbsp;Shaolei Wei ,&nbsp;Xiubo Liu ,&nbsp;Jiafu Cai ,&nbsp;Weize Zhao","doi":"10.1016/j.apacoust.2025.110686","DOIUrl":"10.1016/j.apacoust.2025.110686","url":null,"abstract":"<div><div>Online monitoring of track conditions using commercial trains is pivotal for advancing intelligent railway maintenance. This study introduces a novel Corrugation Vibration-Noise Index (CVNI) based on vibration-noise data fusion to detect rail corrugation via train body dynamic responses. The correlation between train body vibrations, carriage interior noise, and rail corrugation is systematically analyzed, and the CVNI calculation process is derived. The effects of measurement point location, train type, track structure, and curve radius on CVNI are thoroughly investigated. Additionally, an Energy Coupling Index (ECI) is introduced as an auxiliary indicator for rail corrugation detection. A rail corrugation warning criterion based on CVNI is established and validated using field data. The results indicate that, under the same rail corrugation excitation, vertical vibration acceleration signals of the train body are more sensitive to short-wavelength corrugation of 40–60 mm, while carriage interior noise signals are more sensitive to medium-to-long wavelength corrugation of 160 mm. CVNI balances the Vibration Index (VI) and Noise Index (NI), demonstrating robust generalization across varying curve radii and track structures. The combined use of CVNI and ECI effectively mitigates low-frequency noise interference during low-speed operations and accurately identifies rail corrugation sections. When compared to traditional testing methods, the error is reduced to just 1.27 %.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110686"},"PeriodicalIF":3.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686847","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":"Speech intelligibility improvement for public address systems in noisy environments based on automatic gain selection in octave bands","authors":"Józef Kotus,&nbsp;Grzegorz Szwoch","doi":"10.1016/j.apacoust.2025.110683","DOIUrl":"10.1016/j.apacoust.2025.110683","url":null,"abstract":"<div><div>A method of speech intelligibility improvement in public address (PA) systems installed in reverberant acoustic spaces is proposed. The method is mainly intended for systems operating in high background noise levels. The algorithm is based on the near end listening enhancement approach. Signal-to-noise ratio (SNR) is evaluated in the octave frequency bands. Signal levels in the acoustic space are estimated using the measured impulse response of the room. Noise level is measured with the microphone, also a method of noise level estimation in presence of speech is proposed. Based on the calculated SNR values, a set of gain limits is selected, which allows for optimal utilization of the available acoustic power. Finally, gain values for the octave bands are calculated and applied to the speech signal. The overall performance of the proposed method was evaluated in a series of experiments performed in real acoustic spaces. Speech intelligibility was estimated using the STIPA index, measured with and without an additional, high-level noise source. The results indicate that the proposed method improved speech intelligibility in all tested cases, compared with the default PA system, especially in presence of a high-level background noise. The proposed method may be integrated with PA systems equipped with a digital signal processor.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110683"},"PeriodicalIF":3.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686829","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":"Analysis and validation method for polarization phenomena based on acoustic vector Hydrophones","authors":"Zi Yang ,&nbsp;Erzheng Fang","doi":"10.1016/j.apacoust.2025.110669","DOIUrl":"10.1016/j.apacoust.2025.110669","url":null,"abstract":"<div><div>The concept of polarization originated in optics and has been extensively developed and applied in fields such as electromagnetism and seismicity. With the advent of vector sensors, this concept has been introduced into acoustics. However, research on acoustic polarization phenomena in underwater acoustics remains relatively scarce. Therefore, it is necessary to conduct an in-depth investigation into polarization phenomena in acoustic fields. This study proposes a method to analyze and verify the polarization phenomenon in underwater acoustic vector fields. Firstly, the article establishes the basic model of polarization phenomenon in an acoustic vector field, illustrates the time evolution of a bivariate signal in a three-dimensional representation, and elucidates the physical significance underlying this phenomenon. Subsequently, the polarization ellipse in the acoustic vector field and its characterization parameters are derived theoretically and estimated by simulation images. On this basis, the theory is extended to three-dimensional space, and a visual representation of signal polarization characteristics is achieved through the concept of polarization degree. Finally, the proposed method is validated by external field experiments and data analysis. The experimental results are consistent with the theoretical expectations, demonstrating the existence of polarization phenomena in the acoustic vector field.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110669"},"PeriodicalIF":3.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643507","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":"Design and analysis of a microlattice structure for enhanced broadband sound absorption","authors":"Longhu Chen ,&nbsp;Chaoyan Wang ,&nbsp;Hongli Ji ,&nbsp;Jinhao Qiu","doi":"10.1016/j.apacoust.2025.110681","DOIUrl":"10.1016/j.apacoust.2025.110681","url":null,"abstract":"<div><div>This paper presents a novel microlattice structure designed for enhanced broadband sound absorption, leveraging the integration of a body-centered cubic (BCC) lattice with a triply periodic minimal surface (TPMS) I-Wrapped Package (IWP). The proposed microlattice sound absorber (MSA) features a hollow, two-stage parallel-coupled structure, which introduces multi-frequency dissipation components, achieving tunable and broadband sound absorption across a wide frequency range. The study employs both the LRF and JCA models to derive acoustic performance, and results are validated through numerical simulations and impedance tube experiments, demonstrating good agreement. Additionally, parametric analysis results demonstrate that increasing material thickness and reducing unit cell size can enhance overall sound absorption performance. Increasing the depth of the reserved back cavity can lower the peak frequency of the first-order sound absorption. The developed MSA structure is further applied in a muffler system, exhibiting broadband noise reduction and excellent ventilation performance. This research contributes a customizable and efficient approach to noise control, suitable for extreme environments, with broad applications in engineering fields such as aerospace and automotive industries.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110681"},"PeriodicalIF":3.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686813","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":"Multifunctional hybrid metastructure with a combination of flower-shaped Helmholtz resonator and spiral labyrinth: Synergy enhancement in broadband sound absorption and high energy absorption performance","authors":"Weifan Kong ,&nbsp;Tao Fu ,&nbsp;Tao Liu ,&nbsp;Jinxiang Fang ,&nbsp;Sen Wang ,&nbsp;Chao Yang ,&nbsp;Miao Zhao","doi":"10.1016/j.apacoust.2025.110684","DOIUrl":"10.1016/j.apacoust.2025.110684","url":null,"abstract":"<div><div>The increase of the running speed of high-speed trains is accompanied by the continuous increase of the internal noise of the carriage, and the total noise reduction capacity of the sandwich structure, which is the main component of the carriage wall, is limited under the constraints of space dimension and size, which poses a new challenge to the acoustic performance design of the sandwich structure. Based on that, this paper proposes a novel compact composite structure, which consists of a flower-shaped Helmholtz resonator incorporating an embedded tube, a microperforated plate, and a spiral-shaped labyrinth sound-absorbing structure from top to bottom. Simulations of the structure were performed utilizing the finite element analysis software COMSOL, and the results were verified through standing wave tube sound absorption tests. A strong alignment was noted between the experimental outcomes and the simulation results. The results reveal that the average sound absorption coefficient of the structure surpasses 0.95 within the frequency band of 394 Hz to 548 Hz, achieving nearly perfect sound wave absorption. At the resonance frequency of 394 Hz, the peak absorption coefficient attains 0.981369, despite the structure’s thickness being only one-fifteenth of the wavelength corresponding to the absorption peak frequency, highlighting its distinctive deep-subwavelength properties. Even when the structure’s height is reduced to 60 mm, it maintains a wide sound absorption bandwidth, featuring a bandwidth ratio of 70 % where the sound absorption coefficient exceeds 0.5. The structure exemplifies deep-subwavelength properties by effectively managing large wavelengths despite its small size. Furthermore, the energy absorption characteristics of the composite structure are analyzed. It is found that the composite structure has excellent energy absorption characteristics and sound absorption performance. This study proposes a lightweight metastructure with exceptional acoustic performance, it has potential application value in the skin structure of high-speed trains and other transportation equipment.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110684"},"PeriodicalIF":3.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643511","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}