Article
Construction & Building Technology
Lei Gao, Chenzhi Cai, Cheuk Ming Mak, Xuhui He, Yunfeng Zou, Dizi Wu
Summary: This study proposes two types of periodic hollow steel trenches that can simultaneously exhibit Bragg band gaps and local resonance band gaps, aiming to attenuate surface waves induced by ambient vibration and seismic vibration. The effectiveness of these trenches in vibration isolation is demonstrated through numerical calculations and analysis.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Multidisciplinary Sciences
Aydin Ozmutlu
Summary: This study examined the dispersion of an infinite shear beam with periodic lumped masses on an elastic foundation. The dispersion relationship for the periodic masses was derived using the transfer matrix method. Simulations were performed to evaluate the effect of parameters on the dynamic response of the shear beam. It was found that periodic masses have a positive effect on wave attenuation.
Article
Chemistry, Multidisciplinary
Dong Hyeon Oh, Gil Ho Yoon
Summary: This research focuses on theoretical and experimental studies of cylindrical and conical periodic structures for controlling longitudinal wave motion. The results suggest that hybrid structures of cylindrical and conical periodic structures are effective in wave motion control and stiffness.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Lili Yuan, Zhanhua Cai, Peng Zhao, Yong Ding, Tingfeng Ma, Ji Wang
Summary: In this paper, a one-dimensional phononic crystal composed of periodic tunnels on elastic foundations is proposed to meet the needs of vibration reduction in complex vibration environments. The results show that the elastic foundation stiffness, elastic modulus ratio, and axial prestress have significant effects on the location and width of the band gap.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Xiao Wang, Shui Wan, Yuze Nian, Peng Zhou, Yingbo Zhu
Summary: This study explores the use of common building materials like concrete, rubber, and soil to prepare seismic metamaterials. It proposes design solutions for 1D and 2D seismic metamaterials, and analyzes the influence of geometric and material parameters on the band gaps.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Marine
J. Cui, L. F. Cong, B. Teng
Summary: An eigenvalue model is developed to study the band structure of water surface waves in the presence of an infinite array of periodically arranged scatterers. The scattering of waves over arbitrary terrain or bodies is described as a boundary value problem of the Laplace equation, and the boundary integral equation is transformed into an eigenvalue problem using the boundary element method to obtain the band structure. The proposed model is validated and its accuracy is confirmed by comparing with existing models and experimental reflection coefficients. The dependence of the stopbands on the relative size of scatterers and relative water depth is investigated and analyzed.
Article
Engineering, Geological
Liangliang Wu, Zhifei Shi
Summary: This study investigates the attenuation of surface waves in saturated viscoelastic soil by periodic in-filled trench, considering the role of soil viscosity and periodic barriers. Findings show that soil viscosity enhances attenuation when surface wave frequencies fall within the attenuation zone, but plays a key role when frequencies are outside this zone.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Mechanical
Bo Yang, Abdelmalek Zine, Christophe Droz, Mohamed Ichchou
Summary: This paper explores the wave propagation characteristics of micro-sized structures using higher order gradient elasticity theories, specifically the Second Strain Gradient (SSG) theory. The study derives the governing equations and boundary conditions of the continuum model and provides a valuable Lattice Spring Model (LSM) to explain the SSG-based model. The dynamic properties of a 2D beam grid are analyzed within the Wave Finite Element Method (WFEM) framework, and the results demonstrate the significant potential of this approach in investigating the wave propagation characteristics of complex micro-sized periodic structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Yongqiang Ling, Xiaoli Zhu, Lei Song
Summary: Conventional wave impeding boards (WIBs) have limited isolation frequency band due to their dependence on the soil cut-off frequency. To overcome this limitation, a new periodic structural wave impeding board (PSWIB) based on the principles of phononic crystals is proposed. Theoretical and numerical analyses show that PSWIB exhibits bandgap characteristics, allowing for effective isolation of target frequency vibrations.
FRONTIERS IN MATERIALS
(2023)
Article
Acoustics
Sunao Tomita, Hidekazu Nishigaki, Ryuji Omote
Summary: Low noise and vibrations are important for comfortable and environmentally friendly engineering structures. Periodic structures like phononic crystals can effectively suppress noise and vibrations by creating band gaps. This study proposes a metaplate (MP) with periodic hollow structures, which can form band gaps by changing the surface shapes of thin plates. Numerical simulations and experimental results demonstrate that the proposed MP has the potential to tune band gap frequencies and suppress vibrations in engineering structures.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Seung Yoon On, Hyemi Moon, Seong Yeon Park, Tae Woong Ohm, Wonvin Kim, Hyunsoo Hong, Seong Su Kim
Summary: In this study, a Roman-bridge-inspired metamaterial for vibration isolation is proposed that combines a geometrical nonlinear structure and band gap effect by arranging periodic materials in a semicircular arched structure. Finite element analysis and band diagram analysis are conducted to verify the effectiveness of the periodic arch-structured metamaterial. The geometrical parameters of the metamaterial are optimized using a machine learning model, and the optimized structure is validated through numerical analysis and frequency response testing.
MATERIALS & DESIGN
(2022)
Article
Engineering, Civil
Pengcheng Zhao, Kai Zhang, Fang Hong, Zichen Deng
Summary: A spider web-inspired resonator is designed to adjust the band gaps of periodic lattices, increasing the relative density and generating multiple resonant band gaps.
THIN-WALLED STRUCTURES
(2022)
Article
Acoustics
Ajinkya Baxy, A. Rajan, Arnab Banerjee
Summary: The paper reveals a peak phenomenon in curved beams and proposes a solution by introducing the concept of layered periodic curved beams to reduce the impact of this peak, thus improving the application performance of curved beams.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
D. Z. Ning, S. B. Zhang, L. F. Chen, H. -W. Liu, B. Teng
Summary: This study investigates the Bragg scattering of nonlinear surface waves over a wavy bottom using two-dimensional fully nonlinear numerical wave tanks. The results show the existence of classic Bragg resonances as well as newly captured resonances, and demonstrate the opposite roles of surface wave and bottom nonlinearities in shifting the resonance conditions.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Xiaobin Chen, Yeshun Wang, Fei Meng, Kang Xie, Liqin Yi, Yun Zheng
Summary: This paper presents a numerical method to obtain the complex band diagram of a three-dimensional model with periodic underground surface wave barriers. The circular concrete pile was studied using this method, and several evanescent modes with non-zero imaginary parts were observed, which can quantitively measure the attenuation of vibrations. A transmission model with semicircle boundary was established to calculate transmission spectra and investigate the direction of reflected vibration energy. The influence of pile length and number of rows on the isolation effect were studied. Both the evanescent modes and the existence of leaky surface waves (LSWs) contribute to surface wave mitigation.
COMPUTERS AND GEOTECHNICS
(2023)
