Article
Engineering, Mechanical
Yacob Medhin, Kamran A. Khan
Summary: The paper proposes using heterogeneous integrated metamaterials to enhance sound insulation over a broad frequency range. The research found that a broader band of sound absorption can be achieved through hybrid design. The suggested structures may be utilized for creating metamaterials with wider absorption bands for various applications.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
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
Polymer Science
Heyuan Huang, Ertai Cao, Meiying Zhao, Sagr Alamri, Bing Li
Summary: The study introduces the design concept of bionic configuration philosophy into membrane-type acoustic metamaterials to achieve wide sound-attenuation bands in the low frequency range. Two bio-inspired designs show significant sound attenuation with lightweight performance in comparison to traditional MAM configurations.
Article
Mechanics
Yu-Zhou Wang, Li Ma
Summary: This paper proposes a new structure that combines the pyramidal truss core sandwich structure with membrane-type metamaterials, showing good mechanical properties and excellent acoustic performance at low frequency. An analytical model and finite element method are employed to investigate the sound transmission loss (STL) performance, discussing the effects of various factors on the STL of the structure.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Mingxin Xu, William S. Harley, Zhichao Ma, Peter V. S. Lee, David J. Collins
Summary: Acoustic metasurfaces with complex 3D structures complicate their fabrication and applicability to higher frequencies, but an ultrathin metasurface approach utilizing planarized micropillars in a discretized phase array is demonstrated here. This subwavelength metasurface can be easily produced via a single-step etching process and is suitable for megahertz-scale applications. The flexibility of this approach is further demonstrated in the production of complex acoustic patterns via acoustic holography. This metasurface approach, combined with predictive models, has broad potential for robust, high-frequency acoustic manipulation in various applications.
ADVANCED MATERIALS
(2023)
Article
Engineering, Mechanical
D. Roca, J. Cante, O. Lloberas-Valls, T. Pamies, J. Oliver
Summary: MLAM is a novel concept of acoustic metamaterials based on coupled resonance mechanisms, providing enhanced sound attenuation capabilities suitable for large scale manufacturing.
EXTREME MECHANICS LETTERS
(2021)
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
Yu-Zhou Wang, Li Ma
Summary: Sandwich structures, especially curved ones, have garnered significant attention due to their superior stiffness and strength. These structures are essential for meeting mechanical loads as well as thermal, acoustic, optical, and electrical challenges. This paper proposes a composite structure that combines curved shell sandwich structures with acoustic metamaterials to achieve desired mechanical and acoustic properties. The theoretical model is established using the harmonic expansion method and principle of virtual work, and the sound transmission loss (STL) performance is studied along with the impact of structural geometry and material parameters.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Chemistry, Multidisciplinary
Juan Mo, Zongren Peng, Xu Wang
Summary: This paper presents theoretical and numerical studies on the vibrating mechanisms of acoustic micromembranes (A mu Ms) and demonstrates their unique behavior in terms of sound insulation. The results provide a theoretical foundation for designing large-scale, high-insulation assemblies of A mu Ms.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Junyu Li, Yuanyuan Shi, Renjie Jiang, Zhifu Zhang, Qibai Huang
Summary: A fast prediction method for the sound transmission loss (STL) of membrane-type acoustic metamaterials (MAMs) is proposed in this paper. Through numerical simulations, the accuracy of the method is validated and the influence of mass surface density change on STL is investigated.
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
Gino Iannace, Giuseppe Ciaburro, Amelia Trematerra
Summary: Metamaterials are a new technology in the field of noise control, capable of deflecting acoustic waves through resonance effects and periodic geometric structures. Research shows that acoustic barriers made with metamaterials can effectively reduce noise, potentially used for manufacturing acoustic filters for HVAC systems and noises generated by rotating elements.
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
Sunil Kumar Sinha, Arun Kumar, Rajendar Bahl
Summary: The study developed an acoustic attenuation model for estimating the transmission loss of acoustic signals generated by maneuvering aerial vehicles, and validated the model through experimental results, demonstrating its accuracy and reliability for designing and testing algorithms related to maneuvering aerial vehicles.
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, 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.
