Article
Acoustics
F. A. Pires, C. Claeys, E. Deckers, W. Desmet
Summary: This study investigates the impact of the footprint between resonant inclusions and host structure on the stop band behavior of metamaterials. Both numerical and experimental results show that increasing the footprint narrows the stop bands and shifts them to higher frequencies, which can have a beneficial effect during the design stage of metamaterials.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
Di Mu, Keyi Wang, Haisheng Shu, Jiahao Lu
Summary: In this study, a novel local resonant metamaterial (LRM) beam with elastic foundation is proposed and its bandgap characteristics and the effects of structural parameters are investigated. Experimental results validate the theoretical findings, and three methods for bandgap widening are proposed. This research provides guidance for low and ultra-low frequency broadband flexural waves and vibration control.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Optics
Haoyuan Song, Sheng Zhou, Yuling Song, Xuanzhang Wang, Shufang Fu
Summary: By studying the coupled surface plasmon-phonon polaritons in graphene-hBN metamaterials, it is found that the propagation properties can be adjusted by changing the chemical potential and filling ratio. Additionally, tuning the material parameters such as thickness and number of layers can also improve the tunability of the metamaterial. Furthermore, the presence of ghost SPPP modes with oscillation-attenuation characteristics is observed under special conditions, demonstrating the complexity of the propagation behavior in the material system.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Civil
Chunfeng Zhao, Chao Zeng, Witarto Witarto, Hsuan Wen Huang, Junwu Dai, Y. L. Mo
Summary: This study validates the effectiveness of one-dimensional periodic foundation in reducing seismic response through experiments and numerical simulations, demonstrating its ability to act when seismic wave frequencies fall within the band gap range.
ENGINEERING STRUCTURES
(2021)
Article
Mechanics
Jingru Li, Peng Yang, Sheng Li
Summary: This paper explores the vibration characteristics of functionally graded beams using inertial amplification mechanisms and discusses their applicability in engineering applications. The study finds that multiple stop bands can effectively suppress wave propagation, aiding in vibration and sound reduction.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Xudong Fan, Yifan Zhu, Zihao Su, Ning Li, Xiaolong Huang, Yang Kang, Can Li, Chunsheng Weng, Hui Zhang, Bin Liang, Badreddine Assouar
Summary: A novel reconfigurable acoustic metascreen is proposed for broadband manipulations of transmitted acoustic waves. The metascreen consists of uniquely designed unit cells that can modulate the transmitted phase shift within the full 2pi range and have excellent impedance matching with the background medium. By arranging the reconfigurable elements, different phenomena and functionalities, such as acoustic focusing and acoustic bending, can be easily realized. Numerical and experimental results demonstrate the ultra-broadband and reconfigurable features of the metascreen, covering a frequency range from 3 to 17 kHz, which is the majority spectrum of human hearing. The proposed metascreen opens a promising and pragmatic route for the design of compact broadband acoustic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Mechanical
Jialei Deng, Jinan Yang, Sujuan Jiao, Xinhua Long
Summary: The study investigates a nonlinear anti-resonant vibration isolator by coupling a lever-type vibration isolator with a nonlinear vibration absorber to broaden the vibration attenuation bandwidth of passive isolation systems in low-frequency applications. The results show that the proposed NL-AVI has a much wider bandwidth compared to existing lever-type vibration isolators. The transmissibility and width of the stop band can be flexibly designed with structural parameters, and the cubic nonlinearity of the vibration absorber increases the stop band width by shifting the anti-resonant frequency and resonant peak to higher frequencies. The proposed isolator provides a distinctive mechanical mechanism for achieving a combination of transmissibility and width in vibration attenuation characteristics, and it has been successfully validated through experimental prototypes for low-frequency vibration isolation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Changqi Cai, Jiaxi Zhou, Kai Wang, Hongbin Pan, Dongguo Tan, Daolin Xu, Guilin Wen, John E. Mottershead
Summary: This paper proposes a novel metamaterial beam with an embedded quasi-zero-stiffness resonator to achieve wave attenuation in very low-frequency band gaps. The configuration of the quasi-zero-stiffness resonator is developed using compliant mechanism with design optimization, and the characteristic of quasi zero stiffness is achieved by proper pre-compression. The dispersion relations of the metamaterial beam are derived using the transfer matrix method, and the dynamic responses of the beam are obtained using the spectral element method to evaluate the transmittance of the flexural wave. Experimental investigation verifies the formation mechanism of the band gaps, demonstrating very low-frequency band gaps. Therefore, the QZS metamaterial beam holds promise for low wave attenuation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Pengyang Li, Yunshuai Chen, Wei Li, Jian Sun, Jian li, Kai Wang, Quandai Wang
Summary: This study investigates the effect of load force and electrical parameter changes in different directions on the high-frequency vibration output characteristics of a giant magnetostrictive transducer. Measures to reduce amplitude attenuation and improve output stability are proposed based on the results.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Selcuk Kacin, Murat Ozturk, Umur Korkut Sevim, Muharrem Karaaslan, Oguzhan Akgol, Zafer Ozer, Mustafa Demirci, Emin Unal, Bayram Ali Mert, Maide Erdogan Alkurt, Fatih Ozkan Alkurt, Mustafa Tunahan Basar, Seyda Gulsum Kaya
Summary: In this study, a sinusoidal located concrete-based borehole design was proposed for seismic shielding applications. Numerical analysis demonstrated that the design has multiband blocking capability, effectively attenuating seismic wave transmission in the 1-15 Hz frequency range. Experimental measurements and simulations showed good agreement, indicating the high blocking capability of the proposed structure for seismic wave transmission.
Article
Physics, Applied
Di Mu, Keyi Wang, Haisheng Shu, Jiahao Lu
Summary: This paper proposes two improved elastic metamaterials (EMs) with lower starting frequencies and larger bandwidths by introducing two-stage inertial amplification structures and introducing structures and elastic foundations simultaneously. The research provides important guidance for the control and utilization of low and ultra-low frequency vibration in engineering applications and the regulation of low and ultra-low frequency broadband elastic waves in scientific research related functional devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Analytical
Feilong Mao, Saiyin Fang, Ming Li, Changlin Huang, Tingting Deng, Yue Zhao, Gezhou Qin
Summary: This paper studies the effect of frequency on the attenuation characteristics of acoustic emission signals in wood. The results show that the amplitude and energy of acoustic emission signals decrease exponentially with the increase of propagation distance. The change of AE source energy level has no significant effect on the attenuation rate at the same frequency. Soft wood is more sensitive to frequency changes and has a smaller attenuation rate compared to hard wood.
Article
Mechanics
Bastian Telgen, Ole Sigmund, Dennis M. Kochmann
Summary: In this paper, a computational framework for topology optimization of spatially varying cellular structures is introduced and applied to functionally graded truss lattices under quasistatic loading. The method utilizes a first-order homogenization approach and employs finite elements to handle the effective continuum description of the truss. The optimization problem is formulated with respect to the spatially varying basis vectors, and its feasibility and performance are demonstrated through benchmark problems.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Chemistry, Multidisciplinary
Joshua Perkins, Haoyang Cheng, Chris Craig, Daniel W. Hewak, Behrad Gholipour
Summary: Refractory metal-oxide semiconductors, with their high melting points and tunable optical constants, are a neglected platform for nanophononics. We demonstrate that these semiconductors can form metacoatings made of highly subwavelength, periodic metal-oxide layers with a varying refractive index profile. These metacoatings exhibit vibrant structural colors and can be tuned across the visible spectrum through thermal annealing techniques.
Review
Thermodynamics
Mohammed Al Rifaie, Hasanain Abdulhadi, Ahsan Mian
Summary: This study provides a review of vibration fundamentals and emphasizes the application of porous materials and mechanical metamaterials as isolation structures. Metamaterials, with their ability to attenuate oscillation waves, control vibration behavior, and offer good mechanical properties, have a wide range of practical applications. The study also highlights the advantages of metamaterials over porous materials, showing the future potential of using metamaterials as isolators.
ADVANCES IN MECHANICAL ENGINEERING
(2022)
Article
Engineering, Civil
Sudip Chowdhury, Arnab Banerjee, Sondipon Adhikari
Summary: This paper studies the optimal design of inertial amplifier base isolators (IABI) for mitigating the dynamic response of multi-storey buildings under base excitations. The H-2 optimization method is used to obtain closed-form expressions for the optimal design parameters of IABI. The effectiveness of these expressions is evaluated by comparing the frequency and time domain responses of isolated structures to those of uncontrolled structures. The results show that the response reduction capacity of the optimal inertial amplifier base isolator is increased by 50% to 60% compared to traditional base isolators.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Acoustics
Sudip Chowdhury, Arnab Banerjee
Summary: This paper introduces an enhanced inerter-based isolation system (EIBI) for improving broadband vibration control. The optimal design parameters of EIBI, such as frequency and viscous damping ratio, have been derived using the H-2 optimization method. The results show that EIBI has greater response reduction capacity compared to traditional base isolators (TBI), both for harmonic and random white-noise base excitations. Numerical studies further confirm the superior displacement and acceleration reduction capacities of EIBI compared to TBI under near-field earthquake base excitations.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Multidisciplinary
Sudip Chowdhury, Arnab Banerjee, Sondipon Adhikari
Summary: This paper introduces the negative stiffness inertial amplifier tuned mass dampers (NSIA-TMD) and its two novel variants, as well as the nonlinear negative stiffness inertial amplifier tuned mass dampers (NNSIA-TMD). The optimized system parameters and dynamic response reduction capacities of these dampers are obtained and compared with traditional tuned mass dampers.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Materials Science, Multidisciplinary
Ajinkya Baxy, Arnab Banerjee
Summary: A diatomic chain with a periodic structure forms an attenuation bandgap due to Bragg scattering. Breaking the periodicity can yield an edge-state phenomenon where waves and energy are localized at a point of asymmetry. This study proposes an efficient vibrational energy harvesting technique by inserting a piezo-electric harvester at the junction of the asymmetry. Results show that breaking the symmetry of a conventional diatomic chain can significantly improve the performance of the energy harvester. The proposed edge-state energy harvester holds promise for simultaneous energy harvesting and vibration control.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Mechanics
Sudip Chowdhury, Arnab Banerjee, Sondipon Adhikari
Summary: This paper introduces the optimum inertial amplifier tuned mass dampers (IATMD) for vibration reduction of linear and nonlinear dynamic systems. H-2 and H-infinity optimization methods are used to derive the exact closed-form expressions for optimal design parameters of IATMD. The results show that the optimized IATMD systems are significantly superior to the conventional tuned mass damper (CTMD) in terms of dynamic response reduction.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Engineering, Civil
Somya Ranjan Patro, Arnab Banerjee, G. V. Ramana
Summary: This paper investigates the vibration suppression characteristics of a base-excited cantilever beam with a series of lumped masses and spring-mass resonator systems. Both analytical and experimental investigations were conducted to compare the transmittance of the dynamic displacement response of the entire system. The results show the validity of the proposed methodology and provide insights into the influence of the number and location of the spring-mass resonator systems on the vibration characteristics of the system.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Sudip Chowdhury, Arnab Banerjee, Sondipon Adhikari
Summary: This paper introduces a method of combining negative stiffness devices with inerters to traditional base isolators and tuned mass dampers. The optimal design parameters of these novel passive vibration dampers are derived using H2 and H & INFIN; optimization methods. The results show that the optimized negative stiffness inerter-based base isolators and tuned mass dampers outperform traditional base isolators and tuned mass dampers in terms of dynamic response reduction capacity.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Kamal K. Bera, Arnab Banerjee
Summary: This paper introduces the concept of metadamping and its application in acoustic metamaterials. The use of active feedback control enhances the energy dissipation capability of the metamaterials. The study shows that velocity feedback control provides the highest total damping ratio, but at the expense of reduced attenuation bandwidth. Additionally, it is possible to achieve high damping in stiff metamaterials through active control.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Sudip Chowdhury, Arnab Banerjee, Sondipon Adhikari
Summary: This paper introduces the inertial amplifier viscoelastic tuned mass dampers (IAVTMD) and presents the mathematical formulations for optimal design parameters. The dynamic response reduction capacity of IAVTMD is significantly superior to conventional tuned mass dampers, with an improvement ranging from 20.87% to 26.47% for H-2 optimization and 15.48% for H-8 optimization. In addition, the optimized IAVTMD outperforms tuned mass damper inerters (TMDI) with improved dynamic response reduction capacity by 6.94% for H-2 optimization and 23.29% for H-8 optimization. The closed-form expressions for optimal design parameters are effective for practical applications.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Susmita Panda, Arnab Banerjee, Bappaditya Manna
Summary: This paper investigates the impact mechanism of an elastically supported beam in the design of high-speed simply supported bridges under two-way sequential wheel loads. The results suggest that elastic bearings can effectively mitigate vibration in one-way crossings and certain factors such as the speed parameter ratio need to be considered in two-way traffic.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Civil
Sudip Chowdhury, Arnab Banerjee, Sondipon Adhikari
Summary: This paper introduces the design of negative stiffness inerter-based base isolators, which enhance the dynamic response reduction capacity of conventional base isolators by installing negative stiffness devices and inerters. These novel isolators have been installed at the base of multi-storey buildings to mitigate their dynamic responses during vibration.
Article
Computer Science, Interdisciplinary Applications
Rishab Das, Arnab Banerjee, Bappaditya Manna
Summary: This study thoroughly investigates the overall energy dissipation of a pile embedded in the soil, modeled as visco-elastic springs. The term dissipation is used to measure the rate of decay of amplitude of displacement response in the time domain. The dispersion relation of the pile embedded in the soil medium is obtained by implementing the generalized form of Bloch's theorem, which is solved using the free-wave approach to predict the overall dissipation of the system.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Susmita Panda, Arnab Banerjee, Bappaditya Manna
Summary: This paper presents a hybrid model for predicting dynamic displacement using an artificial neural network and a theoretical non-dimensional framework. The results show that the proposed framework has advantages in computational efficiency and the trained models have high accuracy and statistical metrics.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Mechanical
Sudip Chowdhury, Arnab Banerjee
Summary: This paper introduces the application of inerter base isolators, grounded resonating base isolators, and ungrounded resonating base isolators in mitigating the dynamic responses of multi degrees of freedom (MDOF) systems. The mathematical closed-form solutions for the optimal design parameters of these novel isolators in MDOF systems are derived using the H-2 optimization technique. The dynamic response reduction capacities of the novel isolators are found to be higher than those of conventional base isolators.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Acoustics
Tanmoy Chatterjee, Kamal K. Bera, Arnab Banerjee
Summary: In this study, the effect of stochastic parameters on active metadamping in acoustic metamaterials (AMs) is quantified using machine learning. Active metadamping enhances damping in a feedback-controlled metamaterial and enables faster energy dissipation. The trade-off between spatial attenuation and temporal energy dissipation characteristics is observed when velocity-feedback control is applied within the metamaterial. The results demonstrate that metadamping is robust to system uncertainties and Gaussian process captures the behavior of active AMs with significantly lower computational cost compared to Monte Carlo simulations.
JOURNAL OF SOUND AND VIBRATION
(2023)
