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Applied Sciences
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Vibration and Sound Control by Acoustic Meta Structures
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Vibration and Sound Control by Acoustic Meta Structures

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (10 August 2021) | Viewed by 10487

Special Issue Editors

Prof. Dr. Junhong Park

E-Mail Website
Guest Editor
Department of Mechanical Engineering, College of Engineering, Hanyang University, Seoul 04763, Korea
Interests: interior aerodynamic noise in road and air vehicles; micromechanics of polymers and granular materials; measurement of dynamic material properties of polymers; granular and porous materials; fluid-structure interactions and aeroacoustics; vibration; sound radiation analysis of advanced structures; active vibration and noise control using smart materials; structural health monitoring; control of flow-induced sound and vibrations
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Gilho Yoon

E-Mail Website
Co-Guest Editor
School of Mechanical Engineering, Hanyang University, Seoul 04763, Korea
Interests: metamaterial optimization; acoustic; vibration absorber
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the increasing need to reduce vibration and sound with minimal influence on the size, weight, and cost of a system, meta structures are proposed as the medium for efficient wave control. Vibration occurring from internal or external excitations introduces noise to the installed environment and causes fatigue problems in the system itself, thereby reducing the reliability and usage life of a system. Its efficient reduction is crucial to maximize performance. Conventional methods based on spring, mass, dampers, and viscoelastic materials are widely used in vibration control engineering. With the acoustic meta structures, multidisciplinary research involving mathematical, material, and mechanical sciences enables efficient wave control, which was not possible before. Due to the various aspects of a vibration system and wave propagations, the control, design, and reduction strategy requires investigations from many different fields including applied mechanics, solid mechanics, fluid mechanics, acoustics, signal processing, electronics, material science, etc.

Prof. Dr. Junhong Park
Prof. Dr. Gilho Yoon
Guest Editor

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Keywords

  • Meta structures
  • Acoustic meta materials
  • Wave Propagation and control
  • Modeling and simulation of vibration and sound radiation
  • Theoretical and experimental investigations of wave generation and transfer
  • Fluid-structure interactions, acoustic-structure interactions
  • Experimental modal analysis
  • Structural acoustics
  • Vibration analysis of infrastructures
  • Optimization for efficient vibration reduction
  • Ambient excitations and resulting vibrations
  • Excitations from moving loads
  • AI-based understanding of vibration characteristics and design of meta structures

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Published Papers (4 papers)

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Research

14 pages, 5660 KiB  
Article
A Numerical and Experimental Study on an Interconnected Metamaterial for Flexural Vibration Control Based on Modal Strain Energy
by Hyun-Guk Kim, Onyu Jeon and Semyung Wang
Appl. Sci. 2021, 11(10), 4530; https://doi.org/10.3390/app11104530 - 16 May 2021
Cited by 2 | Viewed by 2600
Abstract
In this study, an interconnected metamaterial was proposed to suppress flexural vibration. The interconnected metamaterial can improve the manufacturing and installation processes in terms of convenience because it can be fabricated in the form of a modular multi-celled structure with a single-phase material. [...] Read more.
In this study, an interconnected metamaterial was proposed to suppress flexural vibration. The interconnected metamaterial can improve the manufacturing and installation processes in terms of convenience because it can be fabricated in the form of a modular multi-celled structure with a single-phase material. To evaluate the vibration reduction performance of the metamaterial, stopband analysis was performed, as it solves an iterative eigenvalue problem for the wave vector domain. In order to identify the Bloch mode that contributes to flexural vibration, a concept to extract the Bloch mode based on the modal strain energy was proposed. The vibration-reduction performance of the interconnected metamaterial was numerically verified by using a frequency-response analysis of the multi-celled structure. The interconnected metamaterial proposed in this study was fabricated by using a 3D printer. Finally, the vibration-reduction performance of the multi-celled structure was experimentally verified by using impact testing. Full article
(This article belongs to the Special Issue Vibration and Sound Control by Acoustic Meta Structures)
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10 pages, 3273 KiB  
Article
Analytical Approximations for Sub Wavelength Sound Absorption by Porous Layers with Labyrinthine Slit Perforations
by Keith Attenborough
Appl. Sci. 2021, 11(8), 3299; https://doi.org/10.3390/app11083299 - 7 Apr 2021
Cited by 16 | Viewed by 1987
Abstract
Analytical approximations for the acoustical properties of a rigid-porous matrix perforated by labyrinthine slits are developed using classical theories for sound propagation in tortuous slits and for sound absorption by double porosity materials. Predictions of enhanced low-frequency absorption result from a combination of [...] Read more.
Analytical approximations for the acoustical properties of a rigid-porous matrix perforated by labyrinthine slits are developed using classical theories for sound propagation in tortuous slits and for sound absorption by double porosity materials. Predictions of enhanced low-frequency absorption result from a combination of pressure diffusion and labyrinth tortuosity if there is a high permeability contrast between the matrix and the labyrinthine slit. Additional insight into the predicted influence of the properties of the porous matrix is gained by considering the matrix porosity to be provided by inclined micro-slits. Extra tortuosity can be introduced by alternating the width of the labyrinthine slit. An alternating-width vertical-wall labyrinth perforation is predicted to lead to low-frequency absorption peaks in a relatively low-flow-resistivity and low-porosity matrix. Example predictions, even when using underestimates of labyrinth tortuosity, demonstrate the potential of labyrinthine slit perforations for achieving narrowband deep sub wavelength absorption peaks from thin hard-backed porous layers. Full article
(This article belongs to the Special Issue Vibration and Sound Control by Acoustic Meta Structures)
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25 pages, 9510 KiB  
Article
Dynamical Behaviors Analysis of the Rotor Model with Coupling Faults and Applications of the TPOD Method
by Kuan Lu, Nan Wu, Kangyu Zhang, Chao Fu, Yulin Jin, Yongfeng Yang and Haopeng Zhang
Appl. Sci. 2020, 10(21), 7415; https://doi.org/10.3390/app10217415 - 22 Oct 2020
Cited by 5 | Viewed by 2211
Abstract
The transient proper orthogonal decomposition (TPOD) method is applied for order reduction in the rotor-bearing system with the coupling faults in this paper. A 24 degrees of freedom (DOFs) rotor model supported by a pair of sliding bearings with both crack and rub-impact [...] Read more.
The transient proper orthogonal decomposition (TPOD) method is applied for order reduction in the rotor-bearing system with the coupling faults in this paper. A 24 degrees of freedom (DOFs) rotor model supported by a pair of sliding bearings with both crack and rub-impact faults is established by the discrete modeling method. The complexity of dynamic behaviors of the rotor system with the coupling faults is discussed via the comparison of the rotor system with the single fault (crack or rub-impact). The proper orthogonal mode (POM) energy method is proposed to confirm the DOF number of the reduced model. The TPOD method is used in the coupling faults system to obtain the optimal order reduction model based on the POM energy. The efficiency of the order reduction method is verified by comparing the bifurcation behaviors between the original and the reduced system. The TPOD method provides the optimal order reduction model to study the non-linear dynamic characteristics of the complex rotor system with the coupling faults. Full article
(This article belongs to the Special Issue Vibration and Sound Control by Acoustic Meta Structures)
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13 pages, 2286 KiB  
Article
Free Vibrations of Tapered Horseshoe Circular Arch with Constant Volume
by Byoung Koo Lee, Gweon Sik Kim, Sang Jin Oh and Tae Eun Lee
Appl. Sci. 2020, 10(16), 5431; https://doi.org/10.3390/app10165431 - 6 Aug 2020
Cited by 1 | Viewed by 2798
Abstract
This paper presents free vibrations of the tapered horseshoe circular arch with a constant volume. The volume of the arch is constant, and the cross-sectional shape of the arch is square and circular. The taper function of the arch is a quadratic function. [...] Read more.
This paper presents free vibrations of the tapered horseshoe circular arch with a constant volume. The volume of the arch is constant, and the cross-sectional shape of the arch is square and circular. The taper function of the arch is a quadratic function. Differential equations with the boundary conditions that govern the free vibration of such arches are derived and numerically solved to calculate natural frequencies and mode shapes. The natural frequencies of this study agree well with those of the finite element ADINA. Parametric studies of the geometrical and cross-sectional properties of the arch on frequencies and mode shapes are performed and discussed. Full article
(This article belongs to the Special Issue Vibration and Sound Control by Acoustic Meta Structures)
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