Article
Materials Science, Multidisciplinary
Jong Yun Jeon, Seok Hyeon Hong, Eui Young Choi, Eun Bok, Seung Ho Choi, Ji Won Seo
Summary: The study investigates the bulk modulus of metamaterials composed of Helmholtz resonators through theoretical and experimental results, and introduces an intuitive method to determine the frequency domain in which the negative bulk modulus appears. The findings suggest that using two resonators can result in wider negative bulk modulus areas compared to using one resonator of the same total cavity volume.
CURRENT APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Mariia Krasikova, Sergey Krasikov, Anton Melnikov, Yuri Baloshin, Steffen Marburg, David A. Powell, Andrey Bogdanov
Summary: This study develops the concept of a metahouse chamber for multiple band noise insulation, using a ventilated structure based on the idea of metamaterial systems. Broad stop-bands are achieved through strong coupling between pairs of Helmholtz resonators in the structure, demonstrating an averaged transmission attenuation of -18.6 dB within the spectral range from 1500 to 16 500 Hz both numerically and experimentally. The sparseness of the structure and the possibility of using optically transparent materials suggest the potential for partial optical transparency depending on the arrangement of structural elements.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Physics, Applied
Dylan A. Kovacevich, Bogdan-Ioan Popa
Summary: In this experiment, an adaptive 2D acoustic metamaterials is demonstrated, in which the effective bulk modulus can be precisely tuned by adjusting the transfer function between sensors and drivers. The material shows high scalability and is capable of producing negative, fractional, and large effective bulk modulus as needed.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Dong-Yu Han, Yao-Yin Peng, Guang-Sheng Liu, Xin-Ye Zou, Jian-Chun Cheng
Summary: This study introduces a novel square piezoelectric side-branch pipe-type structure that can tune the performance of acoustic metamaterials without structural modification or complex active control circuits. By adjusting the capacitances connected to the piezoelectric composite sheets, phase control of transmitted waves and switching between different functions can be achieved.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Xiaofan Yun, Wenkui Lin, Rui Hu, Yizhang Liu, Xiaoyi Wang, Guohao Yu, Zhongming Zeng, Xinping Zhang, Baoshun Zhang
Summary: This article presents a bandwidth-enhanced magnetoelectric (BWE-ME) antenna made of a Mo/AlN/FeGa sandwich stack. By combining high-overtone bulk acoustic resonators (HBARs) and film bulk acoustic resonators (FBARs) in parallel, the antenna achieves a broader bandwidth. Simulation results show that the magnetic flux density bandwidth generated by the multi-resonant mode interaction is 18 MHz, which matches the measured results.
APPLIED PHYSICS LETTERS
(2022)
Article
Acoustics
J. Dandsena, D. P. Jena
Summary: This research demonstrates a significant improvement in the bandwidth of interest by installing porous material in the cavity of periodic Helmholtz resonators. The peak amplitude of transmission loss at the resonance frequency regime is damped and impractical when the porous material is installed inside a single resonator. However, with an array of resonators having porous cores, the observed transmission loss has the desired amplitude and elevated bandwidth, making it practical.
Article
Instruments & Instrumentation
Lei Han, Hongli Ji, Jinhao Qiu
Summary: This paper proposes a modified theory for synthesizing the acoustic impedance of an absorbing panel by considering the interference among parallel absorbers. The results of validation on different absorbing panels and the comparison with the mutual-radiation-impedance method show that the modified theoretical model is better at predicting the absorption coefficient than is the traditional theory.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Acoustics
Leandro Rego, Francesco Avallone, Daniele Ragni, Damiano Casalino, Herve Denayer
Summary: A Helmholtz resonator with a curved cavity is studied for reducing jet-installation noise in a configuration comprised by a subsonic jet and a nearby flat plate. The results show that the resonators not only reduce the strength of the acoustic source, but also lower the sound pressure levels of the plate, achieving a noise reduction of approximately 7 dB at the resonance frequency of the single degree-of-freedom liner. The double degree-of-freedom resonator can further reduce the noise by about 3 dB at higher frequencies.
JOURNAL OF SOUND AND VIBRATION
(2022)
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
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
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, Applied
Vincent Laude, Julio Andres Iglesias Martinez, Yan-Feng Wang, Muamer Kadic
Summary: The study examines the effective velocities of acoustic and elastic composites in the long wavelength limit, deriving explicit formulas based on second-order perturbation theory. It identifies strongly anisotropic sonic crystals and phononic crystals, and observes that quasi-longitudinal waves can be significantly slower than shear waves under specific conditions.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
WenQin Wang, XinSheng Fang, NengYin Wang, Yong Li, Tong Hao
Summary: This study reports the realization of acoustic double-zero-index metamaterials (DZIM) by coupling two identical Helmholtz resonators with a connecting channel. The system can generate independently tunable dipolar and virtually unchanged monopolar modes, allowing for simultaneous crossing of mass density and bulk modulus reciprocal zeros. Experimental results agree well with numerical calculations, and a broadband cloaking effect is demonstrated in a two-dimensional waveguide.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
Mingyu Duan, Chenlei Yu, Fengxian Xin, Tian Jian Lu
Summary: This study presents a tunable acoustic metamaterial constructed with a rubber coating and an embedded metallic neck in a metallic hexagonal honeycomb Helmholtz resonator, achieving deep subwavelength thickness and strong load-bearing capability for underwater low-frequency and ultra-broadband acoustic perfect absorption. By adjusting internal geometrical parameters, tunable perfect absorption from 100Hz to 300Hz and ultra-broadband quasi-perfect absorption from 306Hz to 921Hz can be achieved, contributing to the design of underwater acoustic metamaterials and wave control.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
B. Jiang, N. P. Opondo, S. A. Bhave
Summary: Silicon carbide (SiC) is known for its exceptional mechanical properties and has been widely used in microelectromechanical systems. Recent advancements in mechanical tuning of color centers in 4H-SiC have enhanced its application in quantum spintronics. This work demonstrates a lateral overtone mechanical resonator fabricated from a semi-insulating bulk 4H-SiC wafer, showcasing its potential for manipulating quantum states.
APPLIED PHYSICS LETTERS
(2021)
Article
Acoustics
Ahmed Allam, Adel Elsabbagh, Wael Akl
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
Maaz Farooqui, Tamer Elnady, Wael Akl
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
Maaz Farooqui, Tamer Elnady, Wael Akl
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Physics, Applied
Ahmed Allam, Adel Elsabbagh, Wael Akl
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Engineering, Chemical
Wael Akl, Amr M. Baz
ADVANCES IN POLYMER TECHNOLOGY
(2018)
Article
Physics, Applied
Wael Akl, Amr Baz
JOURNAL OF APPLIED PHYSICS
(2012)
Article
Automation & Control Systems
W. Akl, A. Baz
JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME
(2012)
Article
Acoustics
W. Akl, A. Elsabbagh, A. Baz
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2012)
Article
Mechanics
W. Akl, M. Nouh, O. Aldraihem, A. Baz
MECHANICS OF TIME-DEPENDENT MATERIALS
(2019)
Article
Nanoscience & Nanotechnology
Wael Akl, A. Baz
Article
Chemistry, Multidisciplinary
Loay A. Elalfy, Walid M. I. Hassan, Wael N. Akl
JOURNAL OF CHEMISTRY
(2013)
Article
Engineering, Aerospace
Sherif Okda, Amr Elbanhawy, Valery Chernoray, Wael Akl, Adel Elsabbagh
JOURNAL OF AEROSPACE ENGINEERING
(2020)
Article
Engineering, Mechanical
Wael Akl, Hajid Alsupie, Sadok Sassi, Amr M. Baz
Summary: A new class of drill-strings is proposed with passive periodic inserts integrated with local resonance sources to attenuate undesirable vibrations. Proper design of the inserts tend to confine dominant vibration modes of the drill-string within specific frequency zones, blocking propagation of vibrations along the drill-string. Finite element modeling demonstrates the effectiveness of the design in controlling bending, torsional, and axial vibrations compared to conventional solid periodic inserts. Investigation of design parameters establishes guidelines for this class of drill-strings.
Article
Energy & Fuels
Ahmed H. Abdulaziz, Adel M. Elsabbagh, Wael N. Akl
INTERNATIONAL JOURNAL OF RENEWABLE ENERGY RESEARCH
(2015)
Article
Acoustics
W. Akl, A. Baz
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2013)