Article
Acoustics
Zhe Zhang, Xinying Wang, Zhong Yuan Liu, Qiang Fan, Tian Ran Lin
Summary: This paper presents a new design of a perforated plate-type acoustic metamaterial (PAM) that can achieve designated sound insulation while allowing air ventilation and avoiding the influence of membrane pre-tension. The study analyzes the sound insulation mechanism of a typical perforated membrane-type acoustic metamaterial and confirms that the sound transmission loss peaks are due to strong wave interference. An impedance analysis using an electro-acoustic analogy further explores the sound insulation mechanism and validates the strong sound interference as the cause of the peaks. Experimental tests and finite element simulations show that the new perforated PAM design can provide good broadband sound transmission loss at low frequencies, and a practical application in reducing noise propagation from a commercial refrigerator's compressor compartment demonstrates the effectiveness of the design in terms of sound reduction and air ventilation.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
J. Dandsena, D. P. Jena
Summary: Acoustic metamaterials possess unique material properties such as negative effective mass density or negative effective bulk modulus. This study establishes a robust method to estimate and measure the acoustic metamaterial properties of a Helmholtz resonator using the transfer matrix (TM) method and experiments. By introducing perforated panels (PP) and microperforated panels (MPP) in parallel to the resonator, double negative material properties can be achieved. Eight different configurations were analyzed and experimented, demonstrating that the proposed compact model is more effective than a finite array of the same Helmholtz resonators.
NOISE CONTROL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Renjie Jiang, Geman Shi, Chengmao Huang, Weiguang Zheng, Shande Li
Summary: This paper proposes a novel membrane-type acoustic metamaterial (MAM) with asymmetric rings, achieving improved broadband sound isolation performance while maintaining lightweight. The influence of different mass blocks on the membrane is analyzed, demonstrating the superior performance of this MAM compared to traditional MAMs. Furthermore, the tunability of the sound insulation performance of this MAM is proven by discussing the influence of eccentricity and distribution position of the masses. Finally, the MAM is optimized using the Isight platform, resulting in improved average sound transmission loss, bandwidth above 30 dB, and reduced mass density.
Article
Acoustics
Yongzhen Mi, Xiang Yu
Summary: This paper introduces a new type of acoustic metamaterial with improved sound insulation performance by attaching periodic inertial amplification mechanisms to a host beam. The enhancement in low-frequency soundproof capacity is significant, but there is also an undesired sound insulation valley observed at higher frequencies.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Acoustics
C. Gazzola, S. Caverni, A. Corigliano
Summary: Sandwich and composite double panel structures are gaining popularity due to their better sound insulation properties compared to single panel structures. This study introduces a novel acoustic insulation sandwich panel by integrating a metamaterial unit cell with faceplates to achieve an ultra-wide band gap. The panel demonstrates excellent acoustic performance in terms of wave attenuation over a wide frequency range, with critical assessment of solid-air interaction and resonance frequencies using a lumped-parameter model.
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
Multidisciplinary Sciences
H. Q. Nguyen, Q. Wu, H. Chen, J. J. Chen, Y. K. Yu, S. Tracy, G. L. Huang
Summary: An ultra-broadband acoustic barrier assembled from space-coiling metamaterials supporting two Fano resonances is reported, with additional thin viscous foam layers for acoustic hyper-damping. Experimental results show over 10 dB reduction in noise transmission loss across a specific range, along with unconventional broadband absorption observed in the dampened barrier.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Acoustics
Muhammad Ali Bablu, Oluwafemi P. Akinmolayan, James M. Manimala
Summary: Meta-acoustic barriers (MABs) incorporating various local oscillator configurations have tunable TL bandwidths exceeding that of traditional barriers, showing potential for new device implications. The effective-mass modeling approach is an efficient tool for evaluating MAB designs and can easily account for different dynamic features within inclusions. Opportunities exist for creating lightweight barriers for tonal and broadband acoustic applications using recent advances in additive and hybrid manufacturing techniques.
JOURNAL OF THEORETICAL AND COMPUTATIONAL ACOUSTICS
(2022)
Article
Physics, Applied
Shuaixing Wang, Yong Xiao, Jiajia Guo, Hao Zhang, Jihong Wen
Summary: A composite acoustic metamaterial is proposed, consisting of double layer metamaterial plates lined with porous material, which can produce very high diffuse field sound transmission loss beyond the mass law. The material has promising applications in noise control engineering due to its simple construction, light weight, and thinness. Measurements show excellent diffuse field sound transmission loss at broadband low frequencies.
APPLIED PHYSICS LETTERS
(2021)
Article
Acoustics
Huabing Wen, Chunming Wu, Taiying Wu, Junhua Guo
Summary: In this study, the acoustic impedance of perforated plates under airflow conditions was extracted using the frequency domain linear Navier-Stokes method. The results were in agreement with published expression and experimental data, validating the accuracy of the method. The effect of perforation angles on the transmission loss of mufflers was analyzed, showing significant influence when certain conditions are met.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Article
Acoustics
Shuai Wang, Xuecong Zhang, Fengming Li, Seyed Mahmoud Hosseini
Summary: A novel acoustic metamaterial sandwich panel with enhanced sound transmission loss (STL) is proposed by periodically distributing local resonators in the stiffened core. The experimental and theoretical results show peaks in the STL curve near the resonant frequency of the local resonators, demonstrating improved insulation performance.
Article
Physics, Applied
Jun Lan, Yunpeng Liu, Tao Wang, Yifeng Li, Xiaozhou Liu
Summary: This study designs a 1-bit coding metamaterial that can flexibly manipulate the sound propagation path. The subwavelength acoustic propagation control is achieved through the dipole-like characteristic of the Mie resonator. Different metamaterial patterns are fabricated to verify the performance of the designed coding metamaterial.
APPLIED PHYSICS LETTERS
(2022)
Article
Mechanics
Wenliang Gao, Jiaxin Hu, Zhaoye Qin, Fulei Chu
Summary: This research presents a novel perforated metamaterial plate with acoustic black holes (ABHs) interconnected by piezoelectric studs for flexural wave manipulation. It derives the governing equations of the metamaterial plate using the differential quadrature element method and the first-order shear deformation plate theory. The proposed model is validated by comparing with finite element simulation results, and the wave propagation characteristics are obtained. The results show that the introduction of piezoelectric patches in the studs brings wider complete bandgaps (BGs) and stronger collimation effect at lower frequencies.
COMPOSITE STRUCTURES
(2023)
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
Acoustics
Weiyun Liu, Jiazhu Li, D. W. Herrin
Summary: The study measured the sound absorption coefficient and transmission loss of different sound absorbing fabrics, and found that these fabrics can be modeled using the equation commonly used for microperforated panels. By least squares curve fitting, effective perforation diameter and perforation rate can be determined, and a sensitivity study was performed.
Article
Acoustics
F. Langfeldt, W. Gleine, O. von Estorff
JOURNAL OF SOUND AND VIBRATION
(2015)
Article
Acoustics
F. Langfeldt, J. Riecken, W. Gleine, O. von Estorff
JOURNAL OF SOUND AND VIBRATION
(2016)
Article
Acoustics
F. Langfeldt, W. Gleine, O. von Estorff
JOURNAL OF SOUND AND VIBRATION
(2018)
Article
Mechanics
M. Breuer, M. Alletto, F. Langfeldt
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2012)
Article
Acoustics
F. Langfeldt, H. Hoppen, W. Gleine
Article
Acoustics
F. Langfeldt, W. Gleine
JOURNAL OF SOUND AND VIBRATION
(2019)
Proceedings Paper
Engineering, Aerospace
Mazharul Islam, Felix Langfeldt, Jiri Furst, David H. Wood
3RD INTERNATIONAL CONFERENCE ON MECHANICAL, AUTOMOTIVE AND AEROSPACE ENGINEERING 2016
(2017)
Article
Physics, Multidisciplinary
Tinggui Chen, Baizhan Xia, Dejie Yu, Chuanxing Bi
Summary: This study proposes a gradient phononic crystal structure for enhanced acoustic sensing. By breaking the symmetry of the PC structure, topologically protected edge states are introduced, resulting in topological acoustic rainbow trapping. The robustness and enhancement properties are verified numerically and experimentally.
