Damping of Structural Vibration Using Lightweight Granular Materials

Park, J.; Palumbo, Daniel L.

doi:10.1007/s11340-008-9181-x

Cited by 21 publications

(6 citation statements)

References 12 publications

(24 reference statements)

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“…The response of an oscillating cantilever with respect to periodic forcing has also been studied [25][26][27][28][29][30]. Even more complex systems have been investigated, such as the oscillation modes of a plate with an abundance of granulate filled cavities [31][32][33][34] with the aim of noise reduction [19]. For simple systems, such as cantilever oscillators, some progress has been made.…”

Section: Introductionmentioning

confidence: 99%

Movers and shakers: Granular damping in microgravity

Bannerman¹,

Kollmer²,

Sack³

et al. 2011

Phys. Rev. E

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The response of an oscillating granular damper to an initial perturbation is studied using experiments performed in microgravity and granular dynamics simulations. High-speed video and image processing techniques are used to extract experimental data. An inelastic hard sphere model is developed to perform simulations and the results are in excellent agreement with the experiments. The granular damper behaves like a frictional damper and a linear decay of the amplitude is observed. This is true even for the simulation model, where friction forces are absent. A simple expression is developed which predicts the optimal damping conditions for a given amplitude and is independent of the oscillation frequency and particle inelasticities.

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Section: Introductionmentioning

confidence: 99%

Movers and shakers: Granular damping in microgravity

Bannerman¹,

Kollmer²,

Sack³

et al. 2011

Phys. Rev. E

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“…A sketch of such Granular damping element (GDE) is shown Fig.1, whereas Fig.2 schematically presents its working principle. Described GDE elements differ from the similar elements, devices and patents 30-33 that use sand 34,35 , granulated polymers [36][37][38][39] or metals [40][41][42][43][44][45] for enhanced damping, since in our case enhanced damping is not only the result of friction between particles but also result of changed material properties.…”

Section: A Granular Damping Elementsmentioning

confidence: 91%

Viscoelasticity of new generation thermoplastic polyurethane vibration isolators

et al. 2017

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This paper presents the analysis of pressure dependence of three thermoplastic polyurethane (TPU) materials on vibration isolation. The three TPU Elastollan R materials are: 1190A, 1175A and 1195D. Aim of this investigation was to analyze how much the performance of isolation can be enhanced using patented Dissipative bulk and granular systems technology. The technology uses granular polymeric materials to enhance materials properties (without changing its chemical or molecular composition) by exposing them to 'self-pressurization', which shifts material energy absorption maxima towards lower frequencies, to match the excitation frequency of dynamic loading to which a mechanical system is exposed. Relaxation experiments on materials were performed at different isobaric and isothermal states to construct mastercurves, the time-temperature-pressure interrelation was modeled using the Fillers-Moonan-Tschoegl model. Dynamic material functions, related to isolation stiffness and energy absorption, were determined with the Schwarzl approximation. An increase of stiffness and energy absorption at selected hydrostatic pressure, compared to its stiffness and energy absorption at ambient conditions, is represented with κ k (p, ω), defining the increase of stiffness and κ d (p, ω), defining the increase of energy absorption. The study showed that close to the glassy state, moduli of 1190A and 1195D is about 6-9 times higher compared to 1175A, whereas, their properties at ambient conditions are for all practical purposes the same. TPU 1190A turns out to be most sensitive to pressure: at 300M P a its properties are shifted for 5.5 decades, while for 1195D and 1175A this shift is only 3.5 and 1.5 decades, respectively. In conclusion, the stiffness and energy absorption of isolation may be increased with pressure for about 100 times for 1190A and 1195D, and for about 10 times for 1175A. a) Dedicated to dr. David Binding for his contributions to the field of Rheology.

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“…Granular material arranging in a chain-like structure [22], [23] is attractive for force attenuation, and such a discrete system effectively responds to impact loading via stress wave propagation across various interfaces to reduce the transmitted force. Pioneering work on the characteristics of the solitary wave propagation in a homogeneous chain of metallic spheres based on the Hertz contact law was established by Nesterenko [24].…”

Section: Introductionmentioning

confidence: 99%

A Super Energy Mitigation Nanostructure at High Impact Speed Based on Buckyball System

Xiang

et al. 2013

PLoS ONE

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The energy mitigation properties of buckyballs are investigated using molecular dynamics (MD) simulations. A one dimensional buckyball long chain is employed as a unit cell of granular fullerene particles. Two types of buckyballs i.e. C60 and C720 with recoverable and non-recoverable behaviors are chosen respectively. For C60 whose deformation is relatively small, a dissipative contact model is proposed. Over 90% of the total impact energy is proven to be mitigated through interfacial reflection of wave propagation, the van der Waals interaction, covalent potential energy and atomistic kinetic energy evidenced by the decent force attenuation and elongation of transmitted impact. Further, the C720 system is found to outperform its C60 counterpart and is able to mitigate over 99% of the total kinetic energy by using a much shorter chain thanks to its non-recoverable deformation which enhances the four energy dissipation terms. Systematic studies are carried out to elucidate the effects of impactor speed and mass, as well as buckyball size and number on the system energy mitigation performance. This one dimensional buckyball system is especially helpful to deal with the impactor of high impact speed but small mass. The results may shed some lights on the research of high-efficiency energy mitigation material selections and structure designs.

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Damping of Structural Vibration Using Lightweight Granular Materials

Cited by 21 publications

References 12 publications

Movers and shakers: Granular damping in microgravity

Movers and shakers: Granular damping in microgravity

Viscoelasticity of new generation thermoplastic polyurethane vibration isolators

A Super Energy Mitigation Nanostructure at High Impact Speed Based on Buckyball System

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