Article
Nanoscience & Nanotechnology
Samuli Heiskanen, Tuomas A. Puurtinen, Ilari J. Maasilta
Summary: Controlling thermal transport at the nanoscale is crucial for various applications. This study demonstrates that thermal conductance can be controlled using three-dimensional phononic crystals, without the need for suspension. Experimental results show that at sub-Kelvin temperatures, these structures can enhance thermal conductivity.
Article
Acoustics
Seongmin Park, Wonju Jeon
Summary: Researchers proposed a tapered phononic beam with a unit cell consisting of two identical uniform parts and a thickness- and width-varying part. By controlling the geometrical parameters, the phononic beam achieved an ultra-broad and ultra-low frequency band gap from 3.6 Hz to 237.9 Hz.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Multidisciplinary
Liqun Wang, Zhijie Wang, Xin Lu, Liwei Shi
Summary: In this paper, a finite element method based on the Floquet transform and local optimization semi-Cartesian grid is proposed to compute the complex band structure of phononic crystals. The method is able to calculate the complex band structures of phononic crystals with complicated scatterer shapes and has been demonstrated to be effective in the computation of anisotropic inhomogeneous medium.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Acoustics
Nikos Aravantinos-Zafiris, Frieder Lucklum, Mihail M. Sigalas
Summary: This work presents the theoretical and experimental verification of complete phononic band gaps in the Yablonovite structure with additional spheres in a face-centered cubic arrangement. Different spatial directions and polarizations were numerically and experimentally investigated to calculate the phononic band gaps in the acoustic band structure and transmission spectrum. The theoretical findings were confirmed by experimental measurements of 3D-printed prototype samples, showing good agreement and validation of complete phononic band gaps in these structures.
Article
Engineering, Multidisciplinary
Sanne J. van den Boom, Reza Abedi, Fred van Keulen, Alejandro M. Aragon
Summary: Phononic crystals can exhibit band gaps, which are frequency ranges with strong attenuation in the material. The working principle is based on destructive interference of waves reflecting from the periodic arrangement of material interfaces. However, the commonly used density-based representation in topology optimization methods leads to diffuse staircased boundaries, resulting in large and expensive optimization problems. This paper demonstrates the adverse effect of density-based boundary description and proposes a level set-based topology optimization procedure with an enriched finite element method for improved performance.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Mechanics
V. Sladek, J. Sladek, L. Sator, Yueqiu Li
Summary: Based on the higher-grade continuum theory, this study investigates the propagation of longitudinal and transverse anti-plane elastic waves in nanoscale periodic laminates of piezoelectric dielectrics normal to the material. The inclusion of strain gradients, micro-inertia, and direct flexoelectricity phenomena is analyzed using a phenomenological description. The problem is analyzed using one-dimensional equations derived from the Hamilton variation principle. The results show that the transverse waves are unaffected by electric polarization, while the longitudinal waves are influenced. The study also explores the influence of micro-stiffness, micro-inertial length scale parameters, and flexoelectric coefficients on dispersion curves and frequency gaps through parametric analysis.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Sabiju Valiya Valappil, Johannes F. L. Goosen, Alejandro M. Aragon
Summary: Ultrasonic flowmeters using transit-time ultrasonic transducers suffer from measurement errors caused by crosstalk. We propose a mounting mechanism based on a 3-D phononic crystal waveguide to mitigate crosstalk at high frequencies, improving measurement accuracy. By engineering the bandgap frequency range of the phononic crystal waveguide to match the working signal of the flowmeter, we fabricate the waveguide using additive manufacturing and achieve a 40 dB reduction in crosstalk compared to standard transducer configurations.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Physics, Fluids & Plasmas
B. L. Kim, C. Chong, S. Hajarolasvadi, Y. Wang, C. Daraio
Summary: In this study, the response of a one-dimensional phononic lattice with time-periodic elastic properties is investigated in both linear and nonlinear regimes using experimental, numerical and theoretical approaches. It is found that wave-number band gaps emerge under small-amplitude excitation, while large-amplitude responses are stabilized via the nonlinear nature of the magnetic interactions, resulting in a family of nonlinear time-periodic states. Controlling acoustic and elastic wave propagation by balancing nonlinearity and external modulation offers potential applications in signal processing and telecommunication devices.
Article
Engineering, Mechanical
Xi Zhang, Xiaodong Huang, Guoxing Lu
Summary: In this study, a novel perforated Miura-ori phononic structure (PMPS) is introduced, and the tunability of complete or partial bandgaps in specific directions is investigated. The validity of the bandgaps is verified through simulation and experimental measurement of sound transmission loss in a three-dimensional printed Miura-ori panel. The results demonstrate extensive bandgap tunability of PMPS with different design parameters during deployments and folds. Additionally, potential applications of PMPS, such as programmable acoustic waveguides, are demonstrated. Lightweight PMPSs offer an attractive alternative for designing tunable, programmable, and reconfigurable acoustic structures, including sound waveguides, sound barriers, and broadband wave tailors.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Hailong Guo, Xu Yang, Yi Zhu
Summary: In this paper, an unfitted Nitsche's method for computing the band structures of phononic crystal with periodic inclusions of general geometry is proposed. The method avoids the expensive cost of generating body-fitted meshes and simplifies the inclusion of interface conditions. Theoretical results are demonstrated through numerical examples, showing the capability of the proposed method for computing band structures without fitting the interfaces of periodic inclusions.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
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
Chemistry, Physical
Jack A. Logan, Srinivas Mushnoori, Meenakshi Dutt, Alexei Tkachenko
Summary: This study presents a comprehensive framework for characterizing complex self-assembled structures using orientational order parameters. Two classes of tensor order parameters are discussed, which are associated with polyhedral nematic and bond orientational order. The proposed framework allows for the identification of coherent domains within self-assembled structures, including crystalline domains and compact amorphous clusters.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Engineering, Multidisciplinary
Haifeng Gao, Jianguo Liang, Bingxun Li, Changjun Zheng, Toshiro Matsumoto
Summary: This paper presents a level set based topology optimization method for unidirectional phononic structures with finite lattice layers, using Boundary Element Method (BEM) to solve acoustic problems. The study demonstrates the effectiveness of the proposed optimization method for finite unidirectional phononic structures by achieving optimized designs and investigating acoustic wave transmission.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
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
Multidisciplinary Sciences
Negar Yasi, Mahdi Boozari, Mohammad G. H. Alijani, Mohammad H. Neshati
Summary: This paper presents a new technique for analyzing a non-uniform transmission line (NUTL) and waveguides using the explicit Runge-Kutta technique. The proposed method shows suitable sensitivity to discretization error and is compared with the popular uniform cascaded sections (UCS) technique. The accuracy and advantages of the proposed method are demonstrated through theoretical and practical investigations.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
Zhibao Cheng, Min Li, Gaofeng Jia, Zhifei Shi
Summary: This paper proposes an adaptive Gaussian process (AGP) model to efficiently predict the complex dispersion relations for periodic structures. It first predicts the coefficients of the dispersion equation at selected frequencies, and then analytically solves the dispersion equation to establish the complex dispersion relation. PCA is used to reduce the dimension of these coefficients, and an adaptive procedure is integrated to improve the accuracy of the GP model.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Zhibao Cheng, Qun Zhang, Zhifei Shi
Summary: This paper proposes an inerter enhanced dynamic vibration absorber (IDVA) to improve the low-frequency vibration mitigation performance of the floating slab track (FST). The analytical derivations and numerical simulations show that the IDVA is more effective in reducing vibrations and significantly decreasing the relative displacement response of the absorber compared to a regular dynamic vibration absorber.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Yiran Zhang, Hongjun Xiang, Housong Deng, Xuebin Zhang, Jiawang Zhan, Zhifei Shi
Summary: This work focuses on vibration-based piezoelectric energy harvesting and considers two typical types of vibration sources. A stable system-level modeling method is presented, allowing the harvester to be modeled using conventional finite element software and co-simulated with nonlinear circuits. The proposed method is validated and employed to investigate the performances of harvesters under typical real vibrations. Design suggestions for PEHs under different types of vibration sources are also provided.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Construction & Building Technology
Zhibao Cheng, Haomin Ma, Zhifei Shi, Gaofeng Jia
Summary: This paper proposes an inerter enhanced floating floor structure (In-FFS) for seismic hazard mitigation. The In-FFS, equipped with a one-dimensional inerter-based composite system on traditional floating floor structure (FFS), can significantly improve seismic performance. Modal participation property analysis and time history analyses demonstrate that the In-FFS reduces relative displacement and decreases floor acceleration and inter-story drift of the primary structure.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi
Summary: In this study, the concept of topological insulator is introduced into plates in civil engineering, and successfully obtains topologically protected interface states of flexural waves. Through topological wave transport between two domains with distinct topological phases, this novel topological metamaterial plate realizes wave guiding and wave attenuation simultaneously. The influence of geometric and material parameters on the interface states and band gap is discussed in detail. The dynamic characteristics of this novel type of plate are studied through full-field simulation in the frequency domain and experimentally validated. The study demonstrates high transmission efficiency and strong robustness against defects. The performance of the topological metamaterial plate in ambient vibration control is assessed based on measured acceleration records, facilitating the application of topological insulators in vibration mitigation, energy harvesting, and signal detection.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Lingkai Meng, Zhifei Shi, Shengwang Hao, Zhibao Cheng
Summary: The filtering properties of a 2D periodic in-filled trench barrier system subjected to anti-plane and in-plane moving loads are investigated using the spatial Fourier transform and periodic structure theory. The dispersion equations for anti-plane and in-plane wave are obtained using the closed-form solution and the State-Space-Transfer-Matrix-Method (SSTMM), respectively. The vibration isolation regions of the barrier can be determined by comparing the attenuation zones (AZs) with the load-speed-line cluster.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Haomin Ma, Zhibao Cheng, Zhifei Shi, Alessandro Marzani
Summary: This paper proposes a novel passive vibration control system called the Inertial Amplification Mechanism-based Absorber (IAM-A) to mitigate undesired structural vibrations. The design parameters of the IAM-A are obtained using H2 and H & INFIN; optimization methods, and parametric studies and numerical simulations are conducted to evaluate its performance. Results confirm that the IAM-A outperforms the traditional Tuned Mass Damper (TMD) method in suppressing dynamic responses of the primary structure and reducing relative displacement response of the absorber.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi, Qingjuan Meng, C. W. Lim
Summary: This study proposes a novel shallow buried periodic in-filled pipe barrier for mitigating surface waves. Through complex dispersion analysis, numerical simulations, and lab-scale experiments, the effectiveness and robustness of the barrier in attenuating surface waves are verified. The energy dissipation induced by material damping and local resonance of in-filled pipes contribute to wave attenuation. The feasibility of these novel wave barriers for mitigating train-induced vibrations is also preliminarily verified.
ENGINEERING STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Liangliang Wu, Zhifei Shi
Summary: This paper investigates the feasibility of using periodic pile barriers to mitigate vibrations in unsaturated soil. The study finds that periodic wave barriers in unsaturated soil can be designed to have a wide attenuation zone and effectively shield both P1 and S waves. This research removes obstacles for vibration mitigation in unsaturated soil by periodic pile barriers.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Mechanics
Jiahua Zhou, Yonggang Gao, Zhifei Shi
Summary: In this study, a formula for calculating the equivalent radius of detuning periodic pile barriers is proposed and modified using a BP neural network for improved accuracy. The effectiveness and convenience of the equivalent radius formula are verified through the study of the dynamic performances of detuning periodic pile barriers.
JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS
(2022)
Proceedings Paper
Engineering, Civil
Jiahua Zhou, Xingbo Pu, Zhifei Shi
Summary: This paper investigates the application of a new type of metamaterial in vibration mitigation in civil engineering through theoretical analysis and numerical calculations. By generating dispersion effects through local resonance, the propagation of elastic waves in soil is prevented and bandgaps are formed. This has significant implications for designing periodic pile barriers to isolate elastic waves in soil.
ADVANCES IN TRANSPORTATION GEOTECHNICS IV, VOL 3
(2022)
