Article
Acoustics
Zoe Yaw, Weijian Zhou, C. W. Lim
Summary: An adaptive elastic metasurface composed of piezoelectric stacks shunted with negative capacitance circuit is proposed in this paper to actively control the propagation of elastic longitudinal waves. By tuning the negative capacitance, adaptive phase velocity manipulation is achieved, allowing for multiple functionalities at broadband frequencies.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Optics
Bintao Du, Zhihai Wu, Chengkun Dong, Jun Wu, Jun Xia
Summary: In this paper, all-dielectric metasurfaces with dynamic tunability and a large area are fabricated using an easy nanofabrication technique. The metasurfaces exhibit remarkable electric dipole and magnetic dipole resonances.
CHINESE OPTICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Yongjian Luo, Zhen Wang, Yu Chen, Minghui Qin, Zhen Fan, Min Zeng, Guofu Zhou, Xubing Lu, Xingsen Gao, Deyang Chen, Jun-Ming Liu
Summary: Ferroelectrics with negative capacitance effects can amplify the gate voltage in field-effect transistors for low power operation. The tuning of negative capacitance effect in ferroelectric KNbO3 through strain engineering is demonstrated, where the voltage reduction and negative slope in polarization-electric field curves can be controlled by imposing various epitaxial strains. Adjusting the negative curvature region in the polarization-energy landscape under different strain states is responsible for the tunable negative capacitance. This work paves the way for fabricating low-power devices and reducing energy consumption in electronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Mechanical
Huan Li, Jianchun Li, Kaiming Bi
Summary: This paper proposes a novel quasi-active negative stiffness damper (QANSD) for effective and robust seismic protection. The concept of quasi-active control (QAC) is introduced and a specific realization, QANSD, is presented. Comparative numerical studies show that the QANSD is capable of producing the required active control force with much less energy, and its performance matches with active control.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mechanics
Kai Zhang, Liyuan Qi, Pengcheng Zhao, Cheng Zhao, Zichen Deng
Summary: This paper investigates a negative-stiffness mechanical metamaterial consisting of reconfigurable beam elements that can tune its bandgap through deformation. The study shows that the metamaterial exhibits different band structures and band gap ranges under different deformation states, allowing for bandgap tuning. The research provides a new avenue for the design and study of negative-stiffness mechanical metamaterials with bandgap tuning capabilities.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Hong Wang, Ji Zhou, Duofu Song, Yi Wang
Summary: In this study, the researchers achieved tunable electromagnetic responses in the near-infrared region by utilizing the advantages of all-dielectric nanohole arrays and graphene. The graphene/silicon hybrid nanohole arrays demonstrated high performance in terms of resonance quality factor (Q), resonant wavelength, and exhibited interesting optical phenomena and slow polarization response in the ion gel. The proposed platform, compatible with complementary metal-oxide-semiconductor technology, offers potential applications in modulators, photonic memory, artificial intelligence, and neuromorphic computing.
Article
Engineering, Civil
Xiang Shi, Zhiwei Wu, Yingyu Hua, Wei Shi, Songye Zhu, Jinyang Li
Summary: The traditional semi-active suspension system suffers from low energy consumption and compromised control performance. This paper proposes a novel semi-active suspension system that combines passive negative stiffness spring and semi-active damper to achieve both low energy consumption and excellent control performance.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Construction & Building Technology
Xiang Shi, Xiu Guan, Wenai Shen, Lanchang Xing
Summary: This paper proposes a low-power semi-active control strategy to fully track active control force using a semi-active damper (SD) with a passive negative stiffness (NS) device embedded. The strategy avoids the clipping phenomenon of SD forces and enhances control performance by supplying transient power into the cable. Numerical simulations show that the SD with an NS embedded provides superior control performance for the stay cable.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Physics, Applied
Zheng Feng, Dacheng Wang, Caihong Zhang, Song Sun, Xingcheng Xiang, Xiaoqing Jia, Biaobing Jin, Wei Tan
Summary: Active metasurfaces have gained attention for their function switching and wavefront shaping capabilities. This study introduces a new paradigm for controlling metasurfaces by integrating a tunable and programmable spintronic terahertz emitter. Compatibility with conventional materials enables passive metasurfaces to become active, as demonstrated in a quarter-wave plate design. The integration of the spintronic emitter opens possibilities for programmable metasurfaces using spatial light modulators, bridging metasurface and spintronic THz emitter research.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Computer Science, Information Systems
Bowen Zheng, Han Ren, Sensong An, Hong Tang, Hang Li, Mohammad Haerinia, Yunxi Dong, Clayton Fowler, Hualiang Zhang
Summary: Tunable metasurfaces have the potential to control both phase and amplitude of the transmitted wavefront, but current research mainly focuses on phase manipulation while neglecting amplitude control. This article introduces a novel design that can simultaneously control amplitude and phase, validating the design approach and demonstrating flexibility in phase and amplitude tuning.
Article
Optics
Kyohei Yada, Atsushi Sakurai
Summary: The proposed wavelength-selective emitter using nanoslit graphene metasurface utilizes a graphene sheet, metallic slit, and dielectric layer to tailor radiative properties. Thanks to electromagnetic resonances of graphene, the emitter demonstrates high emissivity and a broad peak wavelength shift. This study may facilitate the initial design of wavelength-selective emitters using graphene metasurfaces.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Engineering, Electrical & Electronic
Sanghoon Kim, Aobo Li, Jiyeon Lee, Daniel F. Sievenpiper
Summary: The article introduces a novel metamaterial surface that actively tunes its resonance frequency to absorb electromagnetic waves, achieving a self-tuning function. Experimental results confirm the performance of the metamaterial surface and the increase in absorption frequency range, demonstrating high practical value.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Physics, Applied
Yifei Hao, Tianlin Li, Yu Yun, Xin Li, Xuegang Chen, Jingfeng Song, Zahra Ahmadi, Jeffrey E. Shield, Xiaoshan Xu, Xia Hong
Summary: Controlling the ferroelectric polarization and transient negative capacitance state can be achieved by adjusting the ferroelectric-dielectric layer thickness ratio. The system undergoes an abrupt transition at a critical ratio of 8 to 7, consistent with the evolution of the free-energy profile. The emergence of a multidomain state is observed below the critical ratio.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Applied
Victor Lopez-Richard, Rafael Schio Wengenroth Silva, Ovidiu Lipan, Fabian Hartmann
Summary: The trapping and detrapping of nonequilibrium charge carriers have a peculiar influence on the electrochemical and transport properties of bulk and nanoscopic structures. The emergence of memory response with hysteresis and multiple crossing in the current-voltage response is a result of the modulation of current-voltage loops' topology. This method offers insights into intrinsic features affecting electronic transport and simplifies the complexity of frequency-dependent electrochemical impedance and cyclic voltammetry.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Qifa Lu, Chun-chuan Liu, Zhaohong Qin, Wensheng Ma, Feng-ming Li
Summary: A finite periodic structure consisting of active functionally graded (FG) metamaterial bars is proposed, and the width and location of band gaps for the periodic FG metamaterial structure can be tuned by adjusting the feedback control gain of the controller and designing the gradient index.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Yue Yu, Cong Zhang, Zhenyu Chen, Zhengdi Zhang
Summary: This paper investigates the singular Hopf bifurcation and mixed mode oscillations (MMOs) in the perturbed Bonhoeffer-van der Pol (BVP) circuit. The authors use a generalized fast/slow analysis to show the generation mechanism of two distinct kinds of MMOs. By using parametric modulation and bifurcation theory, the authors analyze the transition mechanism and characteristic features in the BVP circuit.
Article
Engineering, Mechanical
Zhenyu Chen, Guifeng Wang, Fan Shi, C. W. Lim
Summary: This study proposes a new type of active sandwiched PnC beam for inducing topological geometric phase transition and topologically protected interface modes. Theoretical band structure is derived through analytical modeling and validated through numerical analysis. The study finds that the robust interface modes are immune to defects and disorders.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Zhenyu Chen, Guifeng Wang, C. W. Lim
Summary: This manuscript proposes a new approach to break the spatial symmetry in beam systems by tuning the elastic stiffnesses of periodically alternated elastic supports. The bending characteristics of a phononic crystal beam on such a support system are studied using experimental and numerical methods. The results show the appearance of a bandgap and capture mode shape inversion and Zak phase transition. Furthermore, the topologically protected interface modes in an array constructed with periodically arranged unit cells are analyzed. This general mechanism can potentially be applied to other mechanical and dynamic systems to establish topological phase transitions.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Guifeng Wang, Yanhong Guan, Zhenyu Chen, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim
Summary: This article presents theory and design approaches for three thermally controlled subwavelength acoustic topological insulators and analyzes their band structures and topological interface states. The results show that these structures can achieve active control of acoustic waves, providing a new method for controlling acoustic topological modes and sound wave propagation.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Chen Liang, Zoe Yaw, C. W. Lim
Summary: This study investigates the heat-induced wave propagation characteristics of imperfect functionally graded material (FGM) sandwich cylindrical shells in a thermal environment. The results show that the dispersion relations can be determined analytically by using a novel thermal strain energy approach and solving a generalized eigenvalue problem. Parametric investigations are conducted to study the effects of various factors on the wave propagation characteristics of the shells.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Zhenyu Chen, Guifeng Wang, C. W. Lim
Summary: This paper presents a method that uses designed metamaterial barriers and engineered metaconcrete to reflect and redirect surface Rayleigh waves to avoid disastrous consequences. The metabarrier, constructed by embedding metaconcrete cubes in a semi-infinite space, achieves broadband wave attenuation and enables elastic wave trapping and surface wave mode conversion. The research highlights new applications of metaconcretes and can be applied to the design of novel seismic shields for protecting civil infrastructures against seismic destruction.
ENGINEERING STRUCTURES
(2023)
Article
Acoustics
Guifeng Wang, Yuanting Wei, Zhenyu Chen, C. W. Lim
Summary: Due to their great application potential in programmable wave transportation, topological metamaterials have received significant research attention in recent decades. This article presents an acoustic metamaterial composed of a perforated nylon substrate and a ceiled air-flowing channel. The resonance frequency and topological phases of the metamaterial are tuned by filling the holes arranged in a honeycomb lattice with water. By adjusting the height of water columns, two subwavelength bandgaps are opened, leading to controllable bandgap and topological phase transitions. The study explores the dependence of topological protected interface mode frequency and quality factor on water height and proposes a design strategy to obtain high-quality topological protected interface mode at the desired frequency. Additionally, the article demonstrates topological rainbow trapping to terminate waves at different frequencies and locations. The controllable bandgap and topological protected interface mode enable the design of topological structures with simpler structures and lower cost.
Article
Thermodynamics
Guifeng Wang, Fan Shi, Zhenyu Chen, Yue Yu, C. W. Lim
Summary: The interest in phononic crystals and acoustic metamaterials has been a hot topic in recent years. This study proposes a prestressed metamaterial beam with actively tunable piezoelectric springs attached to multiple local resonators. The theoretical analysis of the system is conducted using the Euler-Bernoulli beam theory and Timoshenko beam theory. The dispersion relation and transmission ratio are analytically computed using the spectral element method, and excellent agreement with the benchmark is reported. The paper also investigates the influence of external axial force, resonator number, and mass on the bandgap range and attenuation behavior, and demonstrates the active control of bandgap range and frequency.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Mechanical
Zhenyu Chen, Weijian Zhou
Summary: This paper investigates thermally tunable elastic wave transport with controllable topological properties in a thin plate. By using ferroelectric ceramics and temperature variation, topologically protected elastic waveguide devices can be designed to manipulate band properties and working frequencies. The results show that the topological phononic crystal plate with A-shaped prisms realizes broadband interface modes with high quality factors.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Chen Liang, Zhenyu Chen, Guifeng Wang, C. W. Lim
Summary: This study investigates the thermal vibration characteristics of sandwich cylindrical shells made of functionally graded materials (FGMs). The shells are modeled using the Kirchhoff-Love shell theory, accounting for porosity effects that vary with the mixing degree of constituent materials. The material properties are temperature-dependent and show graded variation along the thickness direction. Analytical solutions for the natural frequencies are determined and compared with numerical simulations and data from the open literature. The study comprehensively examines the effects of various parameters on the thermal vibration characteristics of the composite shell structures.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Yue Yu, Weinan Zhu, Wenyao Zhou, Zhenyu Chen
Summary: This study provides a detailed investigation into the occurrence of complex patterns in the memristive Murali-Lakshmanan-Chua (MLC) circuit system. It examines the bifurcation space and oscillation modes of the fast subsystem, as well as the impact of equilibrium dynamics and discontinuous bifurcations on the overall system dynamics.
JOURNAL OF MECHANICS OF MATERIALS AND STRUCTURES
(2023)
Article
Physics, Applied
Guifeng Wang, Yanhong Guan, Zhenyu Chen, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim
Summary: We design a new topological rainbow trapping device by introducing a topological protected interface mode (TPIM) into the prevailing gradient rainbow device. The dependence of bandgap region and group velocity on the reference foundation stiffness is investigated. We successfully predict and demonstrate TPIM using topological phase transition and Zak phase analysis. Furthermore, we quantitatively evaluate the advancement of topological rainbow devices in vibration amplification and broadband wave attenuation compared to the prevailing gradient device.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zoe Yaw, Weijian Zhou, C. W. Lim
Summary: In this paper, a piezoelectric-based elastic metasurface with hybrid shunting circuits is proposed for adaptive control of flexural waves. By tuning negative capacitance and inductance simultaneously, the metasurface achieves a phase shift ranging from 0-2 pi with high transmission. Compared to existing single shunting circuit designs, the proposed metasurface performs better. Analytical modeling and finite element analysis are conducted to study the transmission and phase shift of the metasurface. Numerical simulations demonstrate switchable functionalities of wave refraction and focusing at different working frequencies.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Acoustics
Guifeng Wang, Zhenyu Chen, C. W. Lim
Summary: Wave manipulation has always been a popular research subject, and the birth of topological insulators has opened up new possibilities for wave control. However, research on higher-order topological insulators is still in its early stages. By introducing anisotropy into a local resonance plate, we have uncovered the effects of tuning the distance between resonators on bandgaps and topological properties. This allows for the design of distinct topological edge states and a path-switchable wave-guiding topological insulator. Furthermore, we have designed a higher-order topological insulator that exhibits remarkable energy concentration at corners, providing possible solutions for wave filtering and routing, as well as integrated solid-state phononic circuits.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Construction & Building Technology
Guoliang Zhi, Xin Xu, Tong Guo, Zhenyu Chen, Minte Zhang
Summary: In this study, laboratory vibration tests and finite element modeling were conducted to investigate the vibration transmission characteristics and mitigation measures in over-track buildings. The experiments revealed that adjusting the thickness of floor slabs and columns can reduce vibration propagation. Additionally, a vibration mitigation measure was developed to effectively reduce vibrations, particularly horizontally transmitted bending waves.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)