Polymer concrete periodic meta-structure to enhance damping for vibration reduction

Kwon, Semin; Ahn, Sangkeun; Koh, Hyo In; Park, Junhong

doi:10.1016/j.compstruct.2019.02.022

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…The viscous damping model that accounts for the energy dissipated by the various sources is generally applied in structural design and analysis, and the equivalent viscous damping ratio is used to represent the damping capacity of concrete structures 11,14,15 . For concrete materials, the viscoelastic damping model and complex damping model are widely used in evaluating their viscous damping 16–18 . For most cases, applying the viscous damping and equivalent viscous damping ratio in characterizing the internal damping characteristics of concrete material and structure is reasonable and acceptable 19–22 …”

Section: Introductionmentioning

confidence: 99%

Relationship between internal viscous damping and stiffness of concrete material and structure

Liang

Wang

et al. 2021

Structural Concrete

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This study focuses on the relationship between the internal viscous damping and the stiffness of concrete material and structure having small deformation amplitude. New damping parameters were proposed to describe the energy dissipation capacity and the vibration–amplitude attenuation rate. An improved damping suspension test method for predicting the essential material parameters, elasticity modulus and loss modulus, was developed and validated. The results show that the viscous damping energy dissipation capacity of concrete material and structure having small deformation amplitude is proportional to the product of the loss factor and the stiffness, and the vibration‐amplitude attenuation rate is proportional to the product of the damping ratio and the natural frequency. The variation in dimensionless damping mainly results from the change in the stiffness of concrete material and structure. The porosity shows the smallest elasticity modulus and the largest energy dissipation capacity of nano‐phase in cement paste under constant loading conditions. The improved damping suspension test method is proposed based on theoretical analysis and is validated using an experiment and finite element analysis.

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Section: Introductionmentioning

confidence: 99%

Relationship between internal viscous damping and stiffness of concrete material and structure

Liang

Wang

et al. 2021

Structural Concrete

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“…Thirdly, when the amount of MWCNTs is too much, it will lead to mutual adsorption and agglomeration. And the water-binder ratio of UHPC was very low, a large number of MWCNTs could not be effectively dispersed in a small amount of water, the agglomerated MWCNTs were loosely wound together without bonding with the cement matrix, the agglomerated part of the winding could not frictionally slip with UHPC [30][31][32], the overall energy dissipation efficiency of MWCNTs decreased. Therefore, when the content of CNT was more than 0.05%, the damping capacity of UHPC will be weakened.…”

Section: Damping Propertymentioning

confidence: 99%

Investigating the influence of multi-walled carbon nanotubes on the mechanical and damping properties of ultra-high performance concrete

Zhang

Weizhao

Zhang

et al. 2020

Science and Engineering of Composite Materials

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In this paper, the effects of multiwalled carbon nanotubes (MWCNTs) on the mechanical and damping properties of ultra-high performance concrete (UHPC) were investigated. The results show that the proper amount of MWCNTs can improve mechanical properties as well as the damping properties. For the mechanical properties, the compressive strength and flexural strength of the specimens increased with the increase of MWCNTs content in the range of 0~0.05% (mass ratio to cement). However, when the content of MWCNTs was more than 0.05wt.%, the mechanical properties of UHPC could not be improved continually because too many MWCNTs were difficult to disperse and agglomerated easily in UHPC. Similar laws also have been found for the damping property of UHPC. The loss factor of UHPC increased with the increase of MWCNTs content in the range of 0 ~ 0.05%. The incorporation of MWCNTs would introduce a large number of interfaces into UHPC, the friction and slip between interfaces were the main reasons for the improvement of the damping property of UHPC. However, when the content of MWCNTs was more than 0.05%, it was difficult to disperse effectively. As a result, the overall energy consumption efficiency of MWCNTs was decreased.

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“…Semin Kwon et al conducted research on the material that is a complex periodic structure composed of cement concrete embedded with a periodic arrangement of polymer concrete (a mixture of polymeric resin and aggregates) [28]. Compared to cement concrete, the material analysed has superior strength, durability and dynamic characteristics.…”

Section: Fig 3 Vibration Sources In Audio Setsmentioning

confidence: 99%

Vibration damping of the anti-vibration platform intended for use in combination with audio/music devices

Breńkacz¹,

Bagiński²,

Korbicz³

2020

J. vibroeng.

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The article presents research on the damping properties of an anti-vibration platform (designed and manufactured by Stacore), which is intended for use in combination with high class audio devices. The platform comprises two parts that are capable of passive vibration damping. The design of this platform is unique and has been developed by applying several technical solutions in a combination not found on any other anti-vibration platform on the audio market. These solutions are described in the article. The first part of the platform is pneumatically operated and the second part uses ball bearings. The casing also fulfils the most important function – vibration damping. It is made of amorphous slate (known for its good vibration-damping properties) and includes a metal plate covered with a special visco-elastic layer that fulfils the role of binding material. The first part of the platform realises the pneumatic damping. It comprises four elastomer pneumatic springs, each with its own air tank. The air tanks are designed to operate at a maximum pressure of 5 bar. The second vibration-damping part of the platform is located above the first part (pneumatic) and consists of ball bearings, used for the isolation of transverse vibration, being relatively difficult to deal with pneumatic springs. The upper part consists of three bearings, each of which comprises of a polished, deep hardened steel racings and a ball made of tungsten carbide. The scientific literature describes many solutions enabling vibration damping, including many anti-vibration platforms. However, the literature lacks the descriptions of analyses conducted on anti-vibration platforms for audio devices. This article is a novelty in the literature as it concerns the experimental research aimed at verifying the vibration-damping capacity of the anti-vibration platform that can be used with audio devices owned by people who appreciate high-quality music. The article describes in detail the whole measurement procedure applied to the vibration damping platform. For research purposes, the anti-vibration platform was suspended on flexible ropes. At first, an electromagnetic vibration exciter was attached to the base on which the platform rested, and then the displacements of the upper and lower part of the platform were measured using laser sensors. Based on these signals, the vibration damping capability (transmissibility) of the platform was determined in two mutually perpendicular directions. In addition to the graph that shows the vibration damping capability of the anti-vibration platform, the signals of the applied force and displacements measured during the research are also presented in this article.

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Polymer concrete periodic meta-structure to enhance damping for vibration reduction

Cited by 15 publications

References 17 publications

Relationship between internal viscous damping and stiffness of concrete material and structure

Relationship between internal viscous damping and stiffness of concrete material and structure

Investigating the influence of multi-walled carbon nanotubes on the mechanical and damping properties of ultra-high performance concrete

Vibration damping of the anti-vibration platform intended for use in combination with audio/music devices

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