Article
Instruments & Instrumentation
Pingting Jiang, Tianxi Jiang, Qingbo He
Summary: This study introduces a novel sound absorber based on micro-perforated resonators, which can be easily tuned using origami process under deep sub-wavelength thickness. The absorber can effectively absorb low-frequency noises and broaden the sound absorption bandwidth.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Physics, Applied
Yingjian Sun, Xujin Yuan, Zhongkun Jin, Guangfu Hong, Mingji Chen, Mengjing Zhou, Weiduan Li, Daining Fang
Summary: This study reports a method to broaden the frequency band of underwater sound absorption structure (USAS) by embedding a membrane-type resonator, forming a membrane-type underwater acoustic absorption metamaterial. The mechanism of the membrane-type metamaterial is explained through theory and validated through simulation and experiment. The experimental results show significant improvement in sound absorption coefficient in the specified frequency range, indicating the potential application in acoustic wave communication and device compatibility design technologies.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
M. Mallejac, P. Sheng, V Tournat, V Romero-Garcia, J-P Groby
Summary: In this paper, a passive treatment method that considers the time domain and multiple reflections is proposed. A delay line is designed using slow-sound propagation in periodic structures, allowing the reproduction of sound perception over a larger distance. The limitations of real-time pulse propagation, dispersion, and losses on audio fidelity are also discussed.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Heng Wang, Longxuan Hu, Qibo Mao, Yuan Cheng, Siteng Yan, Junfeng Yuan
Summary: This study presents a mechanically adjustable acoustical metamaterial (AAMM) for low-frequency sound absorption. By integrating Helmholtz resonators and Fabry-Perot (FP) tubes, a deep-subwavelength material with broad low frequency tunability is achieved. The multi-impedance adjustment method is used to improve the sound absorption effect and provide better compression and fire resistance compared to traditional materials.
Article
Engineering, Mechanical
Jun-Young Jang, Choon-Su Park, Kyungjun Song
Summary: According to the mass law, dense and thick materials are typically used for blocking low-frequency sound waves. However, this study introduces the use of lightweight and thin metamaterials for effective soundproofing. The proposed soundproofing consists of a thin membrane combined with an ultralight membrane-type acoustic metamaterial. Through vibration in the membrane, the soundproofing can be easily tuned to achieve broadband sound insulation. The results of numerical and experimental tests demonstrate the excellent sound-blocking characteristics of this soundproofing material, making it suitable for applications in noise insulation, such as acoustic enclosures, automobile insulation, walls, and engine rooms.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Qishan Xu, Jing Qiao, Jiayue Sun, Guangyu Zhang, Longqiu Li
Summary: A novel sound absorber based on massless membrane-type acoustic metamaterial is proposed in this study, which achieves nearly perfect sound absorption below 500 Hz. Compared to traditional materials, this absorber has flexible tunability and a simple manufacturing process.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Multidisciplinary Sciences
Xindong Zhou, Xiaochen Wang, Fengxian Xin
Summary: In this research, an ultrathin acoustic metamaterial composed of space-coiled water channels with a rubber coating is proposed for underwater sound absorption. The proposed metamaterial achieves perfect sound absorption at 181 Hz with a deep subwavelength thickness. The introduction of a rubber coating leads to slow-sound propagation, which is crucial for achieving perfect low-frequency sound absorption.Parametric studies are conducted to investigate the effects of specific structural and material parameters on sound absorption. By tailoring key geometric parameters, an ultra-broadband underwater sound absorber is constructed, paving a new way for designing underwater acoustic metamaterials and controlling underwater acoustic waves.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Tong Cai, Shuang Huang, Hui Guo, Pei Sun, Tao Yuan
Summary: In this paper, the sound insulation performance of membrane-type acoustic metamaterial with eccentric mass block (MAMEM) is improved by introducing an elastic layer. The study shows that the peak sound insulation frequency of the MAMEM structure can be obtained by introducing the elastic layer in the mass block of MAMEM. The thickness of the elastic and metal layers has an influence on the sound insulation performance of the MAMECM, and under the same mass, the peak frequency of sound insulation can be shifted to the left by reducing the thickness of the metal layer. The experimental results verify the accuracy of the findings.
Article
Chemistry, Physical
Xiaocui Yang, Fei Yang, Xinmin Shen, Enshuai Wang, Xiaonan Zhang, Cheng Shen, Wenqiang Peng
Summary: An adjustable parallel Helmholtz acoustic metamaterial (APH-AM) was developed to address noise control difficulties in the low frequency range. By introducing multiple resonant chambers and adjusting the length of the rear cavity, the APH-AM achieved a broad sound absorption band. Unlike other designs, the adjustment of the APH-AM's sound absorption performance could be directly conducted in transfer function tube measurement. The optimization process resulted in sound absorption coefficients above 0.9 in the frequency range of 602-1287 Hz and above 0.85 in the range of 618-1482 Hz.
Article
Mechanics
Haibin Zhong, Yongjun Tian, Nansha Gao, Kuan Lu, Jiuhui Wu
Summary: This research introduces a new composite underwater honeycomb-type acoustic metamaterial plate with low-frequency broadband sound insulation and high hydrostatic pressure resistance. The structure, consisting of a thin plate clamped between two layers of honeycomb plate, demonstrates good underwater sound insulation performance and local resonance bandgap formation. The theoretical and experimental validations confirm the effectiveness of the proposed metamaterial in achieving significant sound transmission loss performance.
COMPOSITE STRUCTURES
(2021)
Article
Physics, Applied
Zhendong Li, Zhonggang Wang, Zichao Guo, Xinxin Wang, Xifeng Liang
Summary: The study developed a hierarchical acoustic metamaterial with ultra-broadband sound absorption capabilities at high temperatures. The material utilizes a hierarchical design to achieve excellent absorption performance in both low- and mid-frequency ranges, demonstrating unprecedented capabilities in acoustic absorption.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Mechanical
Weitao Zhang, Xuewei Liu, Fengxian Xin
Summary: This study investigates the sound absorption performance of acoustic labyrinthine porous metamaterials at high temperature. The proposed metamaterial, constructed with metal-fibers-based porous matrix and folded slits, exhibits excellent subwavelength absorption due to the pressure diffusion effect. The theoretical model based on the double porosity theory and temperature-dependent parameters is validated by numerical simulations. The results show that the peak frequency of the metamaterial shifts to higher frequencies and the half-absorption bandwidth becomes wider as the temperature increases. The pressure diffusion effect plays a crucial role in suppressing the propagation of long-wavelength sound waves at high temperature. Moreover, the motion of air particles and energy dissipation density increase as the temperature rises, resulting in enhanced sound absorption. The proposed porous metamaterials show promising applications in low-frequency sound absorption at high temperature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Giuseppe Ciaburro, Gino Iannace
Summary: In this study, a new membrane-type acoustic metamaterial was developed using a recycled cork membrane and reusing masses. The results suggest that these structures can be used for the acoustic correction of rooms.
Article
Acoustics
Song Liu, Pan-pan Liu, Ren-jie Zhao, Jian-hua Lu, Kang Yang, Huayu Zhou, Yi-fan Du
Summary: In order to control the noise in the lower frequency band, a new spatial spiral acoustic metamaterial was designed. The calculations and experiments were conducted to analyze the sound absorption and insulation performance.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Article
Acoustics
He Xu, Deyi Kong
Summary: Tunable acoustic properties of a wideband thin-film absorber based on acoustic metamaterial theory are achieved. The absorber is composed of a piezoelectric frame and flexible films with attached mass blocks. By establishing a cellular model of local resonance and exploring the properties of negative effective mass, the absorber's acoustic characteristics under alternating voltage excitation are studied using finite element and experimental methods. The results show that the absorber can effectively absorb sound waves through membrane-cavity coupling resonance, and the absorption can be further enhanced by exciting the mass-spring vibration system with an alternating voltage.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Cailiang Zhang, Zhihui Lai, Zhisheng Tu, Hanqiu Liu, Yong Chen, Ronghua Zhu
Summary: This paper proposes two single-parameter-adjusting SR models to optimize the output performance of SR systems. The effects of the proposed models on SR output under different parameters and signals are investigated through numerical simulations, and their feasibility is verified through experimental results. The research results are of great significance for guiding the design of tri-stable SR models and the application of SR-based signal processing in the context of big data.
Article
Acoustics
Shaoqiong Yang, Hao Chang, Yanhui Wang, Ming Yang, Tongshuai Sun
Summary: In this study, a suspension system based on phononic crystals is designed for vibration isolation of acoustic loads in underwater gliders. The vibration properties of the phononic crystals and the effects of physical parameters on the underwater attenuation zones are investigated. Vibration tests show that the phononic crystal suspension system has a stable vibration isolation effect in the frequency range of 120-5000 Hz.
Article
Acoustics
Xuebin Zhang, Jun Zhang, Tao Liu, Ning Hu
Summary: This study proposes a tunable metamaterial beam to isolate flexural waves. A genetic algorithm-based size optimization is used to obtain a broad low-frequency bandgap. The tunability of the beam is achieved by attaching different numbers of permanent magnets to change the mass of the resonators. Additionally, ultra-broadband flexural wave attenuation is achieved by forming a gradient metamaterial beam based on the rainbow effect. Numerical and experimental results confirm the good flexural wave attenuation ability of the proposed beam.
Article
Acoustics
Luca Rapino, Francesco Ripamonti, Samanta Dallasta, Simone Baro, Roberto Corradi
Summary: This paper presents a method for simulating tyre/road noise using equivalent monopoles, including the synthesis of monopoles through an inverse problem approach and the use of an ISO 10844 road replica for laboratory testing. The method combines acoustic finite element models and numerical simulations of vehicles, and the results are validated by comparing them with measured data.
Article
Acoustics
Xiaoyan Zhu, Tin Oberman, Francesco Aletta
Summary: This paper explores the definition of acoustical heritage and proposes a multidimensional definition based on interviews with experts and detailed analysis of the data.
Article
Acoustics
Faeez Masurkar, Saurabh Aggarwal, Zi Wen Tham, Lei Zhang, Feng Yang, Fangsen Cui
Summary: This research focuses on estimating the elastic constants of orthotropic laminates using ultrasonic guided waves and inverse machine learning models. The results show that this approach has the potential to accurately predict the elastic constants of a material and reduce computational time.
Article
Acoustics
Feng Xiao, Haiquan Liu, Jia Lu
Summary: Diagnostic methods for cardiovascular disease based on heart sound classification have been widely studied due to their noninvasiveness, low-cost, and high efficiency. However, existing research often faces challenges such as the nonstationarity and complexity of heart sound signals, leading to limited capability of neural networks to extract discriminative features. To address these issues, this study proposes a novel convolutional neural network that combines 1D convolution and 2D convolution, and introduces an attention mechanism to enhance feature extraction capability. The study also explores the advantages and disadvantages of combining deep learning features with manual features, and adopts an evolving fuzzy system for decision-making interpretability.
Article
Acoustics
Hong Xu, Zhengyao He, Qiang Shi, Yushi Wang, Bo Zhang
Summary: This paper presents the development of a directional segmented ring transmitting transducer that can radiate sound waves in any horizontal region. The study focuses on the structure of the segmented ring transducer, its radiation sound field characteristics, and the beam pattern control method based on modal synthesis. The authors propose orthogonal beam pattern functions for adjusting steering angles and establish a three-dimensional finite element model to simulate the transmitting beam patterns. Experimental measurements and tests validate the effectiveness of the proposed transducer, showcasing its ability to steer the beam patterns to different directions.
Article
Acoustics
Jirui Yang, Shefeng Yan, Di Zeng, Gang Tan
Summary: This paper proposes an improved domain adaptation framework, self-supervised learning minimax entropy, to enhance the recognition performance of underwater target recognition models. The experimental results demonstrate that applying domain adaptation methods can effectively improve the recognition accuracy of the models under various marine conditions.
Article
Acoustics
Zonghan Sun, Jie Tian, Yuhang Zheng, Xiaocheng Zhu, Zhaohui Du, Hua Ouyang
Summary: This paper analyzes the noise reduction method of installing a sinusoidal-shaped inlet duct on a cooling fan through theoretical and experimental analysis of the acoustic mode modulation. The study establishes the correlation between the free field noise and acoustic mode of the fan rotor and the unsteady forces on the rotor blade surface. The results show that the sinusoidal-shaped inlet duct achieves greater noise reduction compared to a straight duct, especially at the blade passing frequency and its first harmonic.
Article
Acoustics
Min Li, Rumei Han, Hui Xie, Ruining Zhang, Haochen Guo, Yuan Zhang, Jian Kang
Summary: This study is part of a global collaboration to translate and standardise soundscape research. A reliable questionnaire for soundscape characterisation in Mandarin Chinese was developed and validated. The study found that salient sound sources become the focus of attention for individuals in urban open spaces, and the perception is also influenced by the acoustic characteristics of the soundscape. Certain types of sound sources play a more important role in soundscape perception.
Article
Acoustics
Arezoo Talebzadeh, Dick Botteldooren, Timothy Van Renterghem, Pieter Thomas, Dominique Van de Velde, Patricia De Vriendt, Tara Vander Mynsbrugge, Yuanbo Hou, Paul Devos
Summary: This study proposes a sound selection methodology to enhance the soundscape in nursing homes and reduce BPSD by analyzing sound characteristics and recognition methods. The results highlight the sound characteristics that lead to positive responses, while also pointing out the need for further studies to understand which sounds are most suitable for people with dementia.
Article
Acoustics
Yang Yang, Yongxin Yang, Zhigang Chu
Summary: This paper introduces a grid-free compressive beamforming method compatible with arbitrary linear microphone arrays, and demonstrates the correctness and superiority of the proposed method through examples. Monte Carlo simulations are performed to reveal the effects of source coherence, source separation, noise, and number of snapshots.
Article
Acoustics
Sukru Selim Calik, Ayhan Kucukmanisa, Zeynep Hilal Kilimci
Summary: Computer-Aided Language Learning (CALL) is growing rapidly due to the importance of acquiring proficiency in multiple languages for effective communication. In the field of CALL, the detection of mispronunciations is vital for non-native speakers. This research introduces a novel framework using audio-centric transformer models to detect mispronunciations in Arabic phonemes. The results demonstrate that the UNI-SPEECH transformer model yields notable classification outcomes in Arabic phoneme mispronunciation detection. The comprehensive comparison of these transformer models provides valuable insights and guidance for future investigations in this domain.
Article
Acoustics
Yi-Yang Ni, Fei-Yun Wu, Hui-Zhong Yang, Kunde Yang
Summary: This paper proposes an improved method for compressive sensing by introducing a self training dictionary scheme and a CS reconstruction method based on A*OLS, which enhances the sparse representation performance of propeller signals.