Article
Acoustics
Seongmin Park, Jae Yeon Lee, Wonju Jeon
Summary: The study introduces a waveguide absorber based on an acoustic black hole for damping vibrations in plate structures, showing that significant reductions in resonance peaks can be achieved below 500 Hz by optimizing the attachment location and direction.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Mechanics
Yingli Li, Gengwang Yan
Summary: An innovative two-dimensional hybrid auxetic elastic metamaterial was proposed for vibration attenuation, with multiple bandgaps at ultra-low frequency. The bandgap and longitudinal elastic wave attenuation were characterized using theoretical and finite element methods. The mechanisms of bandgap formation and frequency-dependent energy flow were investigated through mode shape analysis and iso-frequency contours.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Acoustics
Yingli Li, Gengwang Yan, Xiaohong Dong, Yong Peng, Xudong Jiang
Summary: Inspired by the advantages of grille structures, this study presents an innovative two-dimensional windmill-like elastic metamaterials (EMs) with multiple resonators for ultrawide bandgap formation at a low frequency. The dispersion relations and mechanism of bandgap formation are investigated using an analytical model. The research provides important clues for the design of vibration isolators, beams, plates, and other devices.
Article
Mechanics
Weidi Wang, Alireza V. Amirkhizi
Summary: This work develops a generalized reduced order modeling approach for determining the dynamics of dynamic mechanical metamaterials (MMs) in low frequency ranges with accuracy and speed. The proposed approach treats MM unit cells as assemblies of structural elements with discrete degrees-of-freedom and optimizes their effective stiffness and inertia based on continuum results. This approach provides a parameterized and discretized representation of MM systems, allowing fast and accurate computation of eigen-study results and dynamic responses.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Multidisciplinary
Danilo Karlicic, Milan Cajic, Stepa Paunovic, Aleksandar Obradovic, Sondipon Adhikari, Johan Christensen
Summary: Non-reciprocal wave propagation has attracted much attention in recent years, and researchers have explored breaking reciprocity using space-and/or time-dependent constitutive material properties to overcome the limitations of conventional mechanical lattices. This study investigates non-reciprocity in elastic locally resonant and phononic-like one-dimensional lattices with time-modulated mass and stiffness properties. The frequency-band structures and asymmetric band gaps are determined for each configuration, and the technique is extended to study more complex two-dimensional lattices.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Materials Science, Multidisciplinary
Xiao-feng Li, Shu-liang Cheng, Hong-yun Yang, Qun Yan, Bin Wang, Yong-tao Sun, Qian Ding, Hao Yan, Hong-ge Han, Qing-xin Zhao, Ya-jun Xin
Summary: In this study, eight branching ligament structures for wind models were proposed to achieve multi-frequency vibration suppression and wave propagation modulation. The structures were verified to have multi-frequency bandgaps using lattice theory, dynamical model and finite element release method. Attaching a solid disc at the center of the model improved the bandgap coverage and reduced the bandgap frequency. Modal analysis showed that the vibration of branch ligaments and border ligaments had a suppression effect on elastic waves. The phase constant surface, phase velocity and wave propagation direction plots at specific frequencies confirmed the directional and regional nature of wave propagation, while the good correspondence of group velocity and wave propagation finite element simulation results validated the findings.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Xiaofan Wang, Haojie Chen, Yuhang Yin, Yongdu Ruan, Shan Zhu, Chuanjie Hu, Huanyang Chen
Summary: A multiband elastic waveguide cloak that utilizes metamaterials is introduced for controlling vibration intensity. By converting flexural waves to waveguide-trapped waves, a cloaking region with negligible vibration is created, providing a new approach to modulating elastic waves. The design has a compact structure, exhibits multiband performance, and is highly suitable for vibration control in various scenarios.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Liyun Cao, Yifan Zhu, Sheng Wan, Yi Zeng, Badreddine Assouar
Summary: This study presents a non-Hermitian loss-modulation beam and plate model based on complex wavenumber plane for designing lossy elastic metamaterials. The high-performance absorption of the metamaterial is achieved through a combination of dissipation-radiation balance and multiple reflections. The study provides a new approach for broadband low-frequency vibration suppression and offers an effective paradigm for wave engineering in non-Hermitian elastic wave systems.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Engineering, Civil
Yuan Du, Tongda Zou, Fuzhen Pang, Chao Hu, Yong Ma, Haichao Li
Summary: In this research, a theoretical model of stiffened plate with multiple dynamic vibration absorbers under different boundary constraints is proposed. The model improves the solution efficiency of equivalent mass by 90% compared to FEM. The model allows for easy implementation of different boundary conditions and the connection relationship between stiffened plate and dynamic vibration absorbers. Its reliability is confirmed by comparing with FEM, related literatures, and experiment. The model can be useful for engineering designers in the process of multi-line spectrum vibration control of stiffened plate.
THIN-WALLED STRUCTURES
(2023)
Article
Green & Sustainable Science & Technology
Wenwen Han, Shui Wan
Summary: In this paper, the flexural wave bandgaps in an LR beam under a global axial force and multiple vertical elastic supports are discussed. An array of inerter-based dynamic vibration absorbers (IDVAs) is attached to the LR beam. The band structure of this prestressed multisupported LR beam is derived and illustrated through a numerical example. The effects of IDVA parameters, axial force, and vertical elastic support on the properties of the bandgaps are evaluated, particularly the merging of bandgaps with an exchange of their edge frequencies.
Article
Acoustics
Vinod Ramakrishnan, Michael J. J. Frazier
Summary: We report on a class of architected material lattices that can independently adjust the local effective mass, damping, and stiffness properties to realize congruent alterations to the acoustic dispersion response post-fabrication. The relation between the tuning element geometry and the achieved variability in effective properties is explored. Bloch's theorem facilitates the dynamic analysis of representative 1D/2D systems, revealing bandgap formation, migration, and closure, and positive/negative metadamping according to the tuning element configuration.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Mechanics
Yingli Li, Ahmed Opeyemi Jamiu, Muhammad Zahradeen Tijjani
Summary: In this study, the elastic wave propagation behavior of a diamond-shaped metastructure was investigated analytically and numerically. The metastructure's dispersion relation was derived based on Bloch's theorem, and the transmittance of the metastructure with finite periods was studied. Various extreme cases of lattice structure parameters were examined to analyze different configuration effects. The validity of the finite element solution was confirmed through a vibration experiment on a 3D printed specimen. The proposed metastructure has potential applications in vibration isolator design.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Acoustics
Hui Sheng, Meng-Xin He, Qian Ding
Summary: This paper presents a modified add-on strategy using multiple acoustic black hole dynamic vibration absorbers to reduce the transverse vibration of beam structures, with the intention of achieving broadband vibration suppression by introducing intentional mistuning effect. Several case studies and multi-objective optimization are conducted to demonstrate the effectiveness of the proposed strategy and its potential for widening the attenuation bandwidth of the acoustic black hole structures.
JOURNAL OF SOUND AND VIBRATION
(2023)
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
Engineering, Mechanical
Rihuan Yu, Shiteng Rui, Xingzhong Wang, Fuyin Ma
Summary: This paper proposes an integrated load-bearing, vibration-isolation design by embedding metamaterial absorbers in supporters to suppress vibration transmission and extend the vibration attenuation bandwidth. This design helps attenuate and reduce equipment noise, and has significant engineering application value.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
