Article
Mechanics
Zheng-Yang Li, Tian-Xue Ma, Yan-Zheng Wang, Yu-Yang Chai, Chuanzeng Zhang, Feng-Ming Li
Summary: This paper proposes a novel design concept for AAAMM plates based on an AAA control strategy guided by the PSO technique. Numerical results show that the proposed AAAMM plates can automatically evolve different feedback control schemes and exhibit improved and enhanced suppression performance for flexural waves.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Physics, Multidisciplinary
ChengBo Hu, Bin Liang, Jing Yang, JianChun Cheng
Summary: The study presents a design and experimental demonstration of a perforated metamaterial acoustic concentrator that is omnidirectional and broadband. By using an ellipsoidal equifrequency contour to redirect acoustic energy, efficient energy concentration in the central region is achieved, with effective concentration observed within a broadband ranging from 1000-1600 Hz.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Physics, Applied
S. Raval, K. Petrover, A. Baz
Summary: This study introduces a newly developed class of passive nonreciprocal acoustic metamaterials and experimentally characterizes their ability in controlling the flow and distribution of acoustic energy. The results demonstrate that the metamaterial can effectively tune the propagation of acoustic energy by introducing anti-parallel diodes.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
Honggang Zhao, Qiquan Zheng, Yang Wang, Junhui Cao, Chao Wang, Jihong Wen
Summary: This study investigates the absorption properties of a metamaterial panel with local resonators through simulation and experimental validation, confirming the accuracy of theoretical predictions. Local resonators can tune the acoustic surface impedance, resulting in different absorption peaks under various boundary conditions.
Article
Materials Science, Multidisciplinary
Shubhi Bansal, Sriram Subramanian
Summary: While acoustic metamaterials face challenges with limited tunability and narrow operational frequency range, integrating liquids with active actuation mechanisms in metamaterials opens up new design possibilities. The use of active microfluidic techniques enables active tunability in liquid-embedded metamaterial designs, leading to the development of a novel class of microfluidic acoustic metamaterials (MAM) with deep-subwavelength ultra-compact tunable features and multi-stable characteristics. MAM demonstrates active acoustic switching, amplitude modulation, and phase modulation with high transmission efficiency and broadband operations, paving the way for automation, tuning, and miniaturization of metamaterials using microelectromechanical (MEMS) and microfluidic concepts.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Physics, Applied
Craig W. Broadman, Christina J. Naify, Michael J. Lee, Michael R. Haberman
Summary: Acoustic imaging in water traditionally relies on phased arrays of active electro-acoustic transducers to steer acoustic energy in specific directions. A potential alternative approach is to use a single transducer attached to a dispersive antenna, known as a leaky wave antenna (LWA). LWAs have been proven effective in beam steering, but designing an analog device in water presents unique challenges due to low acoustic impedance contrast. The study presents a design of an elastic metamaterial waveguide coupled to an external fluid domain for underwater operation, utilizing mass-in-cavity structures for forward-to-backward radiation.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Yong Luo, Ni Dong, Yue Pei, Feng Qian, Rui Wang, Hengrong Cui, Guangli Yang, Xiaojun Hu
Summary: This study introduces an active metamaterial glucose sensor with programmable functionalities, capable of sensitively detecting glucose solution concentrations up to 7000mg/dL. By utilizing programmable modes for different concentration ranges, the sensor achieves high sensitivity and accurate detection within specific concentration ranges.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Mechanical
Peng Sheng, Xin Fang, Li Dai, Dianlong Yu, Jihong Wen
Summary: This paper investigates a honeycomb sandwich plate based on nonlinear acoustic metamaterials and analyzes its vibration reduction properties through numerical and experimental methods. The results show that the plate can effectively suppress low-frequency and broadband vibrations.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Physics, Applied
Mathieu Padlewski, Maxime Volery, Romain Fleury, Herve Lissek, Xinxin Guo
Summary: This paper presents an acoustic dimer composed of two electronically controlled electroacoustic resonators to explore one-dimensional topological phenomena. Active control allows manipulation of the metamaterial's properties, enabling tunable topological phase transitions. The paper provides an analytical model and electronic control scheme, and demonstrates the realization of a tunable one-dimensional topological insulator through consistent band structure analysis from the analytical model, finite-element simulation, and experimental data.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Qing Tong, Jensen Li, Shubo Wang
Summary: This research investigates the circular dichroism effect in acoustic systems. It is found that the effect is negligible in lossy metamaterials with C4 rotational symmetry but can be strongly enhanced in C2-symmetric systems with inhomogeneous loss. This enhancement is attributed to the presence of polarization band gaps and non-Hermitian exceptional points.
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
Physics, Applied
Houyin Li, Zhenyu Wang, Jinlong Luo, Rongli Wang, Jian Huang, Xiaoyan Wang, Hai Yang
Summary: By designing a supermolecular structure consisting of two identical scatterers with opposite orientations, we can achieve topological phase transitions by adjusting the interval between them and rotating them. The study on subwavelength interface states propagating through a T-shaped junction provides promising prospects in developing acoustic double-channel transmission devices based on interface states.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
Maxime Lanoy, Fabrice Lemoult, Geoffroy Lerosey, Arnaud Tourin, Valentin Leroy, John H. Page
Summary: Research has shown that sound waves traveling in water are scattered by a periodic arrangement of air bubbles, with the local structure of the bubbles impacting the wave propagation significantly. Depending on the arrangement of the bubbles, different effects such as bandgap formation and additional branches may occur. At a specific frequency, the material behaves as if its refractive index is -1, enabling the design of a three-dimensional lens.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Yaxin Zhen, Tong Gu, Ye Tang
Summary: This paper analyzes the aeroelastic characteristic and active control of one-dimensional acoustic black hole structures in supersonic airflow. The motion equation of the structures with attached piezoelectric elements is established using Hamilton's principle. The first-order piston theory is used to simulate the aerodynamic pressure, and a controller is designed based on speed feedback and proportional feedback algorithms. Numerical simulations are conducted to study the variation of natural frequency with aerodynamic pressure and analyze the influences of piezoelectric actuators and sensors on aeroelastic flutters.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Acoustics
Junyi Liu, Wenkai Dong, Ting Wang, Meixia Chen, Youmin Lu
Summary: Currently, there is a growing concern about noise pollution in ducts, and studies on sound absorption in pipes are being conducted globally. In order to tackle the issue of eliminating low-frequency noise in pipelines, a multi-resonant cavity duct metamaterial is proposed. The acoustic properties of the metamaterial are calculated using the energy method based on the Hamilton principle and the transfer matrix methodology. The results show that the duct metamaterial, with its band gaps and negative bulk modulus, achieves multiple sound absorption peaks and is beneficial for eliminating low-frequency sound. The plate-cavity interaction contributes to the excellent acoustic characteristics of the duct metamaterial for sound insulation. Parametric analysis of the proposed structure is also conducted. This study demonstrates the potential application of duct metamaterials for multi-frequency sound absorption in engineering practice.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Mechanics
W. Akl, M. Nouh, O. Aldraihem, A. Baz
MECHANICS OF TIME-DEPENDENT MATERIALS
(2019)
Article
Physics, Applied
Salih Alan, Ahmed Allam, Alper Erturk
APPLIED PHYSICS LETTERS
(2019)
Article
Acoustics
Ahmed Allam, Karim G. Sabra, Alper Erturk
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2020)
Article
Physics, Applied
Ahmed Allam, Karim Sabra, Alper Erturk
PHYSICAL REVIEW APPLIED
(2020)
Article
Engineering, Aerospace
Sherif Okda, Amr Elbanhawy, Valery Chernoray, Wael Akl, Adel Elsabbagh
JOURNAL OF AEROSPACE ENGINEERING
(2020)
Article
Physics, Applied
Ahmed Allam, Karim Sabra, Alper Erturk
Summary: The study demonstrates the enhancement of sound energy harvesting by focusing acoustic waves using a 3D-printed gradient-index phononic crystal lens. Numerical simulations and experimental validations show excellent agreement, with the lens significantly increasing the intensity of sound energy and enabling micro-Watt level power output. This technology has potential applications for wireless sensors and other low-power electronic components.
APPLIED PHYSICS LETTERS
(2021)
Article
Instruments & Instrumentation
Ahmed Allam, Karim Sabra, Alper Erturk
Summary: This study achieves simultaneous power harvesting and backscatter communication through frequency multiplexing. A high sensitivity and high bandwidth piezoelectric transducer is designed and a technique to separate power and data into different frequency bands is developed. These technologies can extend the range and bandwidth of ultrasonically powered devices.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Acoustics
A. Allam, O. Alfahmi, H. Patel, C. Sugino, M. Harding, M. Ruzzene, A. Erturk
Summary: This study proposes phased array ultrasonic testing (PAUT) for inspecting thick LPBF components and guided waves for detecting defects in thin curved components. The experimental results demonstrate that these techniques can effectively detect defects of different geometries and sizes.
Article
Automation & Control Systems
Ahmed Allam, Christian Arrington, Christopher St John, Jef Steinfeldt, Alper Erturk, Ihab El-Kady
Summary: In this study, ultrasonic power transfer through metallic barriers was investigated using experiments, analytical modeling, and numerical simulations. A Class E amplifier design was integrated with the ultrasonic system, achieving 83% ac-to-ac efficiency through a 3 mm aluminum barrier at 1 MHz. The system's overall dc-to-dc efficiency peaked at 68% while delivering 17.5 W to a dc load.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Proceedings Paper
Acoustics
Christopher Sugino, Sam Oxandale, Ahmed Allam, Christian Arrington, Christopher St John, Ehren Baca, Jeffrey Steinfeldt, Stephen Hales Swift, Charles Reinke, Alper Erturk, Ihab El-Kady
Summary: The study explores the use of ultrasonic transducers for mechanical communication, and investigates the use of phononic crystal/metamaterial machined into the barrier to reduce crosstalk between channels. Barriers with simultaneous ultrasonic power and data transfer capabilities are fabricated and tested to evaluate the impact of grooving on crosstalk between channels.
INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS 2021)
(2021)
Proceedings Paper
Acoustics
Eetu Kohtanen, Christopher Sugino, Ahmed Allam, Alper Erturk, Ihab El-Kady
Summary: The research focuses on developing a toolkit called COMET to streamline the design and analysis of ultrasonic transducer systems, aiming to achieve optimal data and power transfer rate and efficiency.
INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS 2021)
(2021)
Proceedings Paper
Acoustics
Ahmed Allam, Herit Patel, Christopher Sugino, Christian Arrington, Christopher St John, Jeffrey Steinfeldt, Alper Erturk, Ihab Elkady
Summary: The study introduces a method of using ultrasonic waves for power transmission, utilizing a detachable transmitter and magnetic joint for more efficient coupling, ultimately successfully delivering over 2 watts of power to an electric load.
INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS 2021)
(2021)
Article
Engineering, Multidisciplinary
Ahmed Allam, Christopher Sugino, Matthew Harding, D. Paul Bishop, Alper Erturk, Massimo Ruzzene
Summary: The study explores the use of PAUT as a quality assurance technique for SLM parts by detecting internal defects that could affect mechanical strength and fatigue life. PAUT successfully detected typical internal porosity in Inconel 625 samples produced by SLM due to laser power fluctuation.
JOURNAL OF NONDESTRUCTIVE EVALUATION, DIAGNOSTICS AND PROGNOSTICS OF ENGINEERING SYSTEMS
(2021)
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.
Proceedings Paper
Engineering, Mechanical
Ahmed Allam, Karim Sabra, Alper Erturk
ACTIVE AND PASSIVE SMART STRUCTURES AND INTEGRATED SYSTEMS XIII
(2019)
