Review
Chemistry, Physical
Yiwei Wang, Xiaomei Xu, Li Li
Summary: This article summarizes the structures and tuning methods of bandgaps for piezoelectric phononic crystals (PCs), and analyzes the calculation methods. The shortcomings of current research are discussed, and future development directions are proposed.
Article
Chemistry, Multidisciplinary
Jan N. Kirchhof, Kristina Weinel, Sebastian Heeg, Victor Deinhart, Sviatoslav Kovalchuk, Katja Hoeflich, Kirill Bolotin
Summary: This study combines phononics with two-dimensional materials to control phononic crystals through applied mechanical pressure, exploring the vibrational properties of PnC fabricated from monolayer graphene. Under electrostatic pressure, the entire phononic system exhibits a frequency upshift of approximately 350%, while the defect mode remains localized within the bandgap.
Article
Engineering, Mechanical
Chen Sun, Liang Wang, Heng Jiang, Qian Ding, Zhanli Liu, Yongtao Sun, Xinghao Wang
Summary: This paper proposes a multistage grid-pixel refinement method (MGPRM) combined with genetic algorithm to quickly obtain high-quality topology of Phononic crystal (PnC) by optimizing the bandgap. The results show that the MGPRM combined with the optimization algorithm can provide high-quality original configurations for tunable parameterized microstructures, and it has higher quality and a faster convergence rate compared to different densities of invariant grids and traditional refinement methods.
EXTREME MECHANICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Chao Ma, Shiheng Zhao, Jianbo Zhang, Zheng Chang
Summary: Inspired by spider capture silk, a lightweight and tunable one-dimensional (1D) bead-chain phononic lattice (BCPL) with adjustable bandgaps is reported. The width and midfrequency of the bandgaps depend on the shear modulus and mass density of the beads, while axial pre-stretching allows for flexible tunability. A two-dimensional (2D) BCPL, mimicking the local morphology of an orb-web, is proposed and its wave filtering and directional transmission capabilities are verified through numerical simulations. This work provides insights for the design and development of lightweight tunable elastic wave modulation devices.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Physics, Applied
Chaoyu Sun, Ailing Song, Yanxun Xiang, Fu-Zhen Xuan
Summary: This paper proposes a phononic crystal filter to purify the ultrasonic signal in nonlinear guided wave testing. The design principle, theoretical analysis, and numerical simulations of the proposed filter are introduced, and the results demonstrate its applicability in low-frequency S0 mode Lamb wave nonlinear harmonic wave testing.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Mechanical
Soroush Sepehri, Mahmoud Mosavi Mashhadi, Mir Masoud Seyyed Fakhrabadi
Summary: This study aims to provide a semi-analytical model for wave propagation in fractionally damped nonlinear phononic crystals, emphasizing the importance of considering nonlinearities in modeling periodic materials and providing new insight into energy dissipation in phononic crystals.
NONLINEAR DYNAMICS
(2022)
Article
Acoustics
V. F. Almeida, V. D. Lima, J. R. F. Arruda
Summary: This work proposes the redesign of an intake muffler in a refrigerant compressor using the concept of wave attenuation bands caused by Bragg scattering to improve transmission loss. The research focuses on developing and validating numerical and experimental techniques for periodic muffler design and applying them to a real compressor muffler.
Article
Materials Science, Multidisciplinary
Yuefeng Yu, Jan N. Kirchhof, Aleksei Tsarapkin, Victor Deinhart, Oguzhan Yuecel, Bianca Hoefer, Katja Hoeflich, Kirill Bolotin
Summary: Phononic crystals (PnCs) are artificially patterned media that exhibit phononic band structure similar to the electronic band structure of crystalline solids. In this study, we demonstrate the fabrication of suspended graphene PnCs, where the phononic band structure can be controlled by electrostatically applied mechanical tension. Experimental and simulation results show a mechanically tunable phononic band gap of 28-33 MHz, which can be shifted by 9 MHz under a mechanical tension of 3.1 N m(-1). This work is an important step towards the development of tunable phononics based on 2D materials.
Article
Engineering, Mechanical
Ganesh U. Patil, Songyuan Cui, Kathryn H. Matlack
Summary: This study designs a phononic diode that can control the frequency, mode, and direction of nonreciprocal wave propagation by exploiting the mixing of double-frequency waves in nonlinear phononic materials. The dispersion branch associated with the nonreciprocal wave can be tuned by controlling the frequency of the pump waves, allowing nonreciprocal wave propagation at different frequencies. By selecting appropriate frequencies and controlling the band gaps through external precompression, switching between reciprocal and nonreciprocal wave propagation is possible.
EXTREME MECHANICS LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Chengcheng Luo, Shaowu Ning, Zhanli Liu, Xiang Li, Zhuo Zhuang
Summary: This study proposes a design method for attenuating stress waves pressure using soft matrix embedded with particles. It discusses the relationship between the center frequency and width of the bandgap and the geometric and physical parameters of particle core, and explains the trend of influence by a spring oscillator model. Increasing the radius of hard core could effectively enhance the bandgap width for enhancing the effect of stress wave attenuation.
ENGINEERING COMPUTATIONS
(2021)
Article
Engineering, Mechanical
Qian Geng, Lingyi Kong, Xiongwei Yang, Zhushan Shao, Yueming Li
Summary: This study proposes an easy-to-implement design of a phononic crystal pipe that utilizes attached sleeves to suppress flexural vibration. By utilizing the mechanism of Bragg scattering, a flexural wave bandgap can be obtained through periodic changes in the cross section of the sleeved pipe. The installation of the sleeves simultaneously adds mass and stiffness, resulting in parabolic variations in the bandgap edge frequencies against sleeve dimensions. The asynchronous recovery of the two frequency loci causes the bandgap to close when the sleeve covers approximately half the length of the unit cell. This feature is not observed in analyses of binary phononic crystal pipes. Equivalent models are proposed to discuss the predicted variations, and the singular dependence of bandgap closure on sleeve length is theoretically explained. Experiments validate the feasibility of attaching sleeves for flexural vibration suppression of pipes. The proposed design effectively attenuates vibration energy within the intended bandgap.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
T. A. Taha, Hussein A. Elsayed, Ahmed Mehaney
Summary: In this research study, a 1D photonic crystal (PnC) sensor was designed to monitor small changes in the concentration of NaCl. Experimental results showed that the resonant frequency of the localized mode shifted to lower frequencies with increasing salinity concentration, leading to significant changes in sensitivity and other parameters. Additionally, the effect of fabrication tolerance on sensor performance was found to be negligible. Overall, this sensor design exhibits lower radiation losses and higher stability with temperature changes compared to other 1D and 2D PnC, electrochemical, and optical designs.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Engineering, Mechanical
Xiaohua Liu, Ning Chen, Junrui Jiao, Jian Liu
Summary: This paper presents a computationally designed pneumatic soft phononic crystal for tunable band gap. By mechanically generating deformation through air pressure, the band gap in the crystal can be opened or closed, and its width can be adjusted. The study shows that pneumatic manipulation is a low-cost, fast, and easily integrated means compared to traditional mechanical deformation methods.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Yuqi Jin, Arup Neogi
Summary: This study demonstrates the detections and mappings of a solid object using a thermally tunable solid-state phononic crystal lens for potential use in future long-distance detection. By changing the temperature, the focal length of the phononic crystal lens can be adjusted, and experiments in water show a higher signal-to-noise ratio with the thermo-reversible tunable lens.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Crystallography
Yan Chen, Gen Li, Rujie Sun, Guoping Chen
Summary: This paper investigates elastic wave propagation in one-dimensional discrete local resonance nonlinear phononic crystals using the perturbation method and derives the nonlinear dispersion relation through analytical solution. The results indicate that the band's cut-off frequency is closely related to the degree of nonlinearity and wave amplitude.
Article
Engineering, Marine
Andi Haris, Shahrokh Sepehrirahnama, Heow Pueh Lee, Kian-Meng Lim
Summary: This article presents a methodology for reducing ship structure vibration through local structural stiffness modifications, considering three design criteria. Testing on simple cases and applying the methodology to a containership model demonstrate that increasing plate thickness in localized regions significantly reduces global vibration levels when excitation is near resonant frequencies.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Wenchuan Zhao, Yu Zhang, Kian Meng Lim, Jun Luo, Ning Wang
Summary: The study focuses on the structural characteristics and propulsion mechanism of the sea lion fore flipper and designs a pneumatic soft-bodied bionic flipper with strong underwater mobility. The theoretical model and numerical simulation show that the bionic flipper has superior hydrodynamic performance, and experimental testing confirms its accuracy and feasibility. This research provides methods and references for the research and implementation of underwater propellers.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Acoustics
Heow Pueh Lee, Sanjay Kumar, Saurabh Garg, Kian Meng Lim
Summary: This study measured aircraft flypast noise near Singapore Changi Airport and found that the noise level for taking-off aircraft was significantly higher than that for incoming aircraft, with a significant difference between A-weighting and C-weighting measurements.
Article
Mechanics
Cang He, Kian Meng Lim, Xiao Liang, Fang Zhang, Jinhui Jiang
Summary: This study introduces a mechanism for manipulating band structures by adjusting string tensions, allowing for the simultaneous shifting of Bragg and local resonance band gaps, as well as achieving ultra-wide band gaps and narrow band filters.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Hongqiu Li, Jinhui Jiang, Wenxu Cui, Jiamin Zhao, M. Shadi Mohamed
Summary: In this paper, a novel method based on function principles in the time domain is proposed to identify dynamic loads. By establishing a linear relationship between external load and structural response and solving the inverse problem in each micro-segment, this method effectively solves the problem of cumulative errors in the time-domain method and demonstrates strong resistance to noise interference.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Hongji Yang, Jinhui Jiang, Guoping Chen, Jiamin Zhao
Summary: In this study, a novel method based on a deep dilated convolution neural network (DCNN) is proposed for dynamic load identification. By directly constructing the inverse model between vibration response and excitation, the accurate computation of model parameters is avoided. Experimental results show that the proposed method has a strong anti-noise ability and is applicable to engineering applications with uncertain parameters, distributions of measurement points, and frequency data.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Physical
Xiao Liang, Fang Zhang, Jinhui Jiang, Cang He, Hongji Yang
Summary: This study proposes a compact elastic metamaterial (EMM) with a novel ultralow-frequency bandgap, based on the analysis of the propagation properties of Lamb waves. The role of auxeticity in the dissociation between dipole mode and toroidal dipole mode is revealed, and multiple bandgaps are integrated using improved gradient design, resulting in broadband wave isolation.
Article
Multidisciplinary Sciences
Hongzhi Tang, Jinhui Jiang, M. Shadi Mohamed, Fang Zhang, Xu Wang
Summary: This paper proposes a dynamic load identification algorithm based on the extended Kalman filter for structures with unknown mass and stiffness coefficients, which has higher accuracy and a wider application scope compared to the traditional methods.
Article
Mechanics
Cang He, Kian Meng Lim, Fang Zhang
Summary: This paper presents a sandwich beam design that combines the features of Acoustic Black Hole (ABH) and local resonance mechanism for sub-wavelength vibration reduction. Parametric analysis shows that increasing ABH power and reducing truncation thickness can widen the frequency band gaps, while the mass of the viscoelastic layer benefits attenuation intensity. Inserting stiffeners to alleviate stress concentration has negligible impact on the transmission spectra.
Review
Green & Sustainable Science & Technology
Linus Yinn Leng Ang, Fangsen Cui, Kian-Meng Lim, Heow Pueh Lee
Summary: As sustainability is crucial for future cities, natural ventilation is a way to reduce energy consumption and carbon dioxide emissions. Ventilated acoustic metamaterials, which provide both ventilation and noise control, have gained research attention. In this systematic review, three types of ventilated acoustic metamaterials were identified. However, more research is needed to address the challenges of one type, metacages, for its real-world applications in noise control.
Article
Engineering, Civil
Cang He, Fang Zhang, Kian Meng Lim, Jinhui Jiang, Jiamin Zhao
Summary: Acoustic Black Hole (ABH) is a wedged taper that can slow down bending wave speed in thin-walled structures. However, its application is limited by the weakened structural strength caused by digging holes. We propose a compound layout with acoustically soft materials to retain structural topology and enhance load-bearing capacity.
THIN-WALLED STRUCTURES
(2023)
Review
Biochemical Research Methods
Shahrokh Sepehrirahnama, Abhishek Ray Mohapatra, Sebastian Oberst, Yan Kei Chiang, David A. Powell, Kian-Meng Lim
Summary: The motion of small objects in acoustophoresis is influenced by the acoustic radiation force and torque, which are nonlinear phenomena consisting of primary and secondary components. The tutorial presents the theory of acoustic interaction forces, describing their features and comparing theoretical results with experimental measurements. It also demonstrates the clustering patterns induced by close-range interaction of objects.
Article
Acoustics
Heow Pueh Lee, Sanjay Kumar, Saurabh Garg, Kian Meng Lim
Summary: This paper measures the cabin noise of four airport express rail systems and finds that there is significant low-frequency noise below 100 Hz which is not captured by dB(A) measurements. The specifications and maximum speeds of these systems have a significant impact on the noise levels.
Article
Acoustics
Halis Yilmaz
Summary: We construct the N-fold standard binary Darboux transformation for the coupled Gerdjikov-Ivanov equation and use it to obtain explicit solutions of the equation in terms of quasi-Grammians. Furthermore, we present various particular solutions for the equation, including soliton, breather, and rogue wave solutions.
