Vibration Isolation in a System Using Granular Medium

Sato, Taichi; Tanaka, Kihachiro; Aida, Shuji; Mouri, Yoshiharu

doi:10.1299/jsmec1993.38.434

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…By using this force, the contact force F and the torque T caused by the contact force are obtained using equations (10) and (11). Then, the particle motion is analyzed using equation (2). The same procedure is repeated for all the particles.…”

Section: Methodsmentioning

confidence: 99%

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Impact Damping With Granular Materials in a Horizontally Vibrating System

Saeki¹

2002

Journal of Sound and Vibration

148

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Section: Methodsmentioning

confidence: 99%

“…However, the signi"cant impact force may result in high noise levels and surface degradation. Sato et al reported that these problems may be reduced by means of granular materials instead of the single particle [2].…”

Section: Introductionmentioning

confidence: 99%

Impact Damping With Granular Materials in a Horizontally Vibrating System

Saeki¹

2002

Journal of Sound and Vibration

148

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“…Granular materials can also damp impacts and oscillations due to their ability to dissipate mechanical energy through inelastic collisions and friction between particles2122. Recently, a considerable amount of research focused on the efficiency of granular dampers (GD) has been developed222324252627. A granular damper consists of a number of grains enclosed in a receptacle that is attached or embedded in a vibrating structure2226.…”

mentioning

confidence: 99%

Rebound of a confined granular material: combination of a bouncing ball and a granular damper

Pacheco-Vázquez

Dorbolo

2013

Sci Rep

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A ball dropped over a solid surface bounces several times before a complete stop. The bouncing can be reduced by introducing a liquid into the ball; however, the first rebound remains largely unaffected by the fluid. Granular materials can also work as dampers. We investigated the rebound of a container partially filled with a given mass of grains m i . During the collision, the kinetic energy of the container is partially transferred to the grains, the rebound is damped, and the fast energy dissipation through inter-particle collisions and friction decreases the bouncing time dramatically. For grain-filled cylinders, a completely inelastic collision (zero rebound) is obtained when m i $ 1.5e o m c , where e o and m c are the coefficient of restitution and mass of the empty container. For grain-filled spheres, the first rebound is almost undamped, but the second collision is completely inelastic if m i ? m c . These findings are potentially useful to design new granular damping systems.T he bounce of a ball dropped over a solid surface is a prolific topic in physics and engineering [1][2][3][4][5][6][7] . This simple system constitutes the basis to describe the rebound of sophisticated objects and more complex systems; for example, bouncing viscoelastic spheres 8 , non-homogeneous balls 9 , solid spheres into fluids 10 , balls 11 , dimers 12 and trimers 13 on vibrated plates, and vibrated granular materials [14][15][16][17] . Certain applications require materials that minimize the loss of energy during the rebound; e.g., in the design of small rubber balls in sport science 18 . On the other hand, in some cases it is necessary to damp the impact in order to protect the bouncing object, as in the landing of a massive spacecraft in Mars exploration missions 19 (where a rover, protected by its lander structure and airbags, hits the ground and bounces several times before reaching the repose). A recent research 20 showed that the rebound of a hollow sphere can be damped when it is partially filled with a liquid. The presence of the fluid does not affect the first rebound, but the second rebound is mitigated by the sloshing and collapsing of the liquid. The maximum damping is obtained when the liquid occupies about 30% of the available space and less notorious for larger liquid volumes.Granular materials can also damp impacts and oscillations due to their ability to dissipate mechanical energy through inelastic collisions and friction between particles 21,22 . Recently, a considerable amount of research focused on the efficiency of granular dampers (GD) has been developed [22][23][24][25][26][27] . A granular damper consists of a number of grains enclosed in a receptacle that is attached or embedded in a vibrating structure 22,26 . In comparison with classical viscous dampers, GD exhibit several advantages for applications under extreme conditions: they are simple, easy to maintain, robust, very durable, no sensitive to temperature and effective over a wide range of frequencies [23][24][25] . It is only natural that ...

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“…All of the publications mentioned in this paragraph to this point have used impact excitations, however the excitation type was found to have an important influence on the vibration response. Sato et al (1995) presented an isolation system, which consists of multiple chambers for several granular materials, to damp the rigid vibrations of a cylinder excited by electromagnetic force. In contrast, Papalou and Masri (1998) studied particle dampers under harmonic excitation and used spherical steel solids instead of granular materials as particles.…”

Section: Introductionmentioning

confidence: 99%

An effective vibration reduction concept for automotive applications based on granular-filled cavities

Duvigneau

Koch

Woschke

et al. 2016

Journal of Vibration and Control

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The acoustic behavior of a combustion engine is primarily dominated by the sound radiation of the oil pan. Therefore, the vibration behavior of the oil pan as the prominent noise emission source is investigated in this paper. The aim of this study is to present a new vibration reduction concept, which is based on the property of high damping possessed by granular materials. The efficiency of this concept is proven by measurements via a scanning laser vibrometer. Finally, it is shown that it is possible to create a lighter oil pan which shows much lower vibration amplitudes than the original one.

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Vibration Isolation in a System Using Granular Medium

Cited by 6 publications

References 3 publications

Impact Damping With Granular Materials in a Horizontally Vibrating System

Impact Damping With Granular Materials in a Horizontally Vibrating System

Rebound of a confined granular material: combination of a bouncing ball and a granular damper

An effective vibration reduction concept for automotive applications based on granular-filled cavities

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