Article
Physics, Applied
Santosh Dasila, Chitti Venkata Krishnamurthy, V. Subramanian
Summary: A miniaturized, broadband absorber with high absorption rate (> 95%) has been proposed and constructed, using quarter-wavelength resonator tubes as rectangular meta-atoms. The study presents the basic theoretical aspects, numerical simulations, fabrication process, and experimental validation of the absorber. The use of simple, fabrication-friendly meta-atoms allows for greater spatial coverage by tiling over large surfaces.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Kejing Ma, Ting Tan, Zhimiao Yan, Fengrui Liu, Wei-Hsin Liao, Wenming Zhang
Summary: A novel metamaterial and Helmholtz coupled resonator (MHCR) are proposed in this paper to enhance sound energy density through energy focusing and pressure amplification, with promising results in increasing the transmission ratio and voltage output of energy harvesters.
Article
Chemistry, Physical
Tianrun Li, Zhemin Wang, Hanjie Xiao, Zhimiao Yan, Cheng Yang, Ting Tan
Summary: This study introduces a Helmholtz acoustic metamaterial (HAM) piezoelectric device with dual-band acoustic energy harvesting characteristics, which amplifies both structural and local resonances for improved energy conversion efficiency. Numerical simulations and experimental results demonstrate that the energy conversion efficiency of HAM is significantly higher than that of traditional acoustic metamaterials in both structural and local resonance bands.
Article
Engineering, Mechanical
Guilin Wen, Sidong Zhang, Hongxin Wang, Zhen-Pei Wang, Junfeng He, Zijie Chen, Jie Liu, Yi Min Xie
Summary: Noise reduction is crucial in engineering applications. A novel origami-based acoustic metamaterial (OBAM) with tunable and broad bandwidth sound-eliminating capacities is developed in this study. The OBAM's sound attenuation properties are extensively investigated through theoretical, numerical, and experimental methods, showing good consistency. The OBAM demonstrates powerful and broadband low-frequency sound elimination capacity at sub-wavelength.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Ki Yong An, Hojin Kwon, Jun-Young Jang, Kyungjun Song
Summary: This study investigates the design of acoustic metamaterial (AMM) for reducing flow noise when using a vacuum cleaner. Through acoustic simulations and experiments, the effectiveness of noise reduction in specific frequency bands was verified.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Shaohua Bi, Fei Yang, Shuai Tang, Xinmin Shen, Xiaonan Zhang, Jingwei Zhu, Xiaocui Yang, Wenqiang Peng, Feng Yuan
Summary: A Helmholtz resonator with an embedded aperture is an effective acoustic metamaterial for low-frequency noise reduction, and its sound absorption property is significantly affected by the aperture shape. The sound absorption properties of HRs with different tangent sectional shapes were studied using a two-dimensional acoustic finite element simulation, while the HRs with various cross-sectional shapes were investigated using a three-dimensional acoustic finite element simulation. The reason for these phenomena was analyzed based on the distributions of sound pressure, acoustic velocity, and temperature. On the optimized tangent and cross-sectional shape, the sound absorption property of parallel-connection Helmholtz resonators was optimized, and the experimental sample achieved an average sound absorption coefficient of 0.7821 in the frequency range of 500-820 Hz with a thickness of only 30 mm. The research findings highlight the significance of aperture shape and provide guidance for the development of low-frequency sound absorbers.
Article
Instruments & Instrumentation
Hanjie Xiao, Ting Tan, Tianrun Li, Liang Zhang, Chaolian Yuan, Zhimiao Yan
Summary: This study investigates energy localization in Helmholtz acoustic metamaterials (HAMs) with multiple point defects within two defect bands through numerical simulations and experimental analysis. By intentionally removing multiple Helmholtz resonators (HRs) from the HAM, the localized interaction of elastic waves within these defects enhances the energy harvesting efficiency of the HAM. The results show that the double-defect HAM structures outperform the single-defect HAM in both the first and second band gaps, with the energy harvesting intensifying as the distance between the defects decreases.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Acoustics
Ahmad Yusuf Ismail, Jisan Kim, Se-Myong Chang, Bonyong Koo
Summary: This paper presents a study on the impact of Helmholtz resonator-based acoustic metasurface on sound transmission loss. By optimizing the design variables of the metasurface, such as the number of cells, thickness, and multilayering, the noise reduction performance of the system can be improved. Experimental validation and numerical results demonstrate the effectiveness of the proposed design.
Article
Acoustics
Lianchun Li, Yifan Diao, Haijun Wu, Weikang Jiang
Summary: Passive phase-controlled acoustic arrays based on metamaterial surfaces artificially manipulate acoustic waves, which have a wide range of applications. This study proposes an array based on Helmholtz resonators and labyrinth acoustic metamaterials, which achieves full phase control at a specific frequency through optimized thickness.
Article
Physics, Applied
Xiaobin Cui, Jinjie Shi, Xiaozhou Liu, Yun Lai
Summary: The study introduces and demonstrates an acoustic energy harvester utilizing an acoustic metasurface and Helmholtz resonator, which significantly increases sound intensity and open voltage at the working frequency, showing high efficiency, flat geometry, and scalability.
APPLIED PHYSICS LETTERS
(2021)
Article
Acoustics
Abhishek Gautam, Alper Celik, Mahdi Azarpeyvand
Summary: This study explores the acoustic performance of double degree of freedom Helmholtz resonators and multi-cell acoustic liners made from these resonators. The results suggest that increasing the volume ratio can enhance the sound absorption bandwidth, which is supported by the finite element analysis results.
Article
Mathematics, Applied
A. V. Porubov
Summary: The features of nonlinear strain solitary waves in a metamaterial mass-in-mass lattice model were studied in the continuum limit. The coupling between the masses attached to the main chain is the main characteristic of the model. An asymptotic procedure was developed to decouple the governing continuum equations and obtain a single equation for longitudinal strains. Analytical and numerical solutions of the equation showed that the nonlinearity of the metamaterial model and the attached mass influenced the localization of strain waves and the number of generated localized waves. An improvement of the model was suggested by including a switch-on/off mechanism for the attached masses to control the localization of nonlinear strain waves in the metamaterial.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Acoustics
Xiao-Ling Gai, Xi-Wen Guan, Ze-Nong Cai, Xian-Hui Li, Wen-Cheng Hu, Tuo Xing, Fang Wang
Summary: This paper proposes a honeycomb-like sandwich acoustic metamaterial that can effectively control low-frequency noise. By establishing finite element models and analyzing the effects of different parameters, the role of Helmholtz resonators in transmission loss is studied. Experimental results confirm the excellent sound insulation performance of this acoustic metamaterial.
Article
Acoustics
F. Langfeldt, A. J. Khatokar, W. Gleine
Summary: This paper investigates a new approach for improving the bandwidth of plate-type acoustic metamaterials (PAM) by using Helmholtz resonators. By adding Helmholtz resonators to PAM, the bandwidth of sound transmission loss can be increased without significant reductions in sound transmission loss.
Article
Chemistry, Multidisciplinary
Lingling Wu, Zirui Zhai, Xinguang Zhao, Xiaoyong Tian, Dichen Li, Qianxuan Wang, Hanqing Jiang
Summary: This study introduces a modular design method to create acoustic metamaterials based on nested Helmholtz resonators for low-frequency sound attenuation, utilizing finite element methods and genetic algorithms. The optimized acoustic metamaterials demonstrate noise attenuation properties in both simulated and experimental results, showing potential for practical sound attenuation applications in industries by considering different environments and constraints.
ADVANCED FUNCTIONAL MATERIALS
(2022)
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.
