Absence of Subharmonic Response in Vibrated Granular Systems under Microgravity Conditions

Kollmer, Jonathan E.; Tupy, Martin; Heckel, Maria; Sack, Achim; Pöschel, Thorsten

doi:10.1103/physrevapplied.3.024007

Cited by 14 publications

(12 citation statements)

References 38 publications

(56 reference statements)

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“…While the present manuscript focuses on the damping efficiency based on the conditions of the experiments of [16,18,28], the physics of the granular system in the gas-like regime should be investigated more systematically considering different particle numbers and system sizes. Moreover, it would be interesting to investigate the dissipative behavior of the different particle shapes in more detail, especially close to the critical amplitude where dissipation is maximal (see figure 2).…”

Section: Resultsmentioning

confidence: 99%

“…Initially the particles are deposited under the action of gravity on the bottom of the granular damper, whereupon the damper starts to oscillate with frequency ω and amplitude A damp . While the deposition of the particles with the damper at rest is performed using Earth gravity, the shaking of the damper occurs under conditions of weightlessness [18,28].…”

Section: Simulation Of the Granular Dampermentioning

confidence: 99%

“…Indeed, granular dampers perform particulary well in applications where the acceleration due to gravity can be neglected, because gravity tends to demobilize the granulate (see [15]). This is why much attention has been given to the study of granular dampers in microgravity conditions, in particular to investigate the factors controlling their performance [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Granular dampers: does particle shape matter?

2016

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By means of particle-based numerical simulations using the discrete element method, we address the question of how the performance of granular dampers is affected by the shape of the granular particles. In consistence with previous experiments performed with nearly spherical particles we find that independently of the particles' shape, the granular system is characterized by a gas-like regime for small amplitudes of the container's oscillation and by a collect-and-collide regime for large amplitude forcing. Both regimes are separated by an optimal operation mode-the critical amplitude of the damping oscillation for which the energy dissipation is maximal-which is independent of the particle shape for given conditions of particle mass, material properties and number of particles. However, in the gas-like regime, we find that spherical particles lead to more efficient energy dissipation compared to complex shaped particles of the same mass. In this regime, a dependence on the damper's efficiency on the particle shape is found. performance and operation mode of granular dampers, that is, the average value of total dissipated energy per oscillation cycle, in response to the vibration amplitude [28,29].

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Section: Resultsmentioning

confidence: 99%

Section: Simulation Of the Granular Dampermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Granular dampers: does particle shape matter?

2016

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“…Refs. [17,18,21], the physics of the granular system in the gas-like regime should be investigated more systematically considering different particle numbers and system sizes. Moreover, it would be interesting to investigate the dissipative behavior of the different particle shapes in more detail, especially close to the critical amplitude where dissipation is maximal (see Fig.…”

Section: Numerical Experimentsmentioning

confidence: 99%

Effect of particle shape on the efficiency of granular dampers

2017

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Granular dampers, containers partially filled with granular material, are often applied for attenuating mechanical vibrations in a broad range of systems. However, the role of the particle shape on the performance of the damper has remained largely uncertain and is investigated here by means of particle-based simulations. It is found that, for large excitation amplitudes (collect-and-collide regime), particle shape nearly does not affect the damper's performance. For low excitation amplitudes (gas-like regime), a dependence on the average dissipated energy per cycle on the particle shape is found. In this regime, the spherical particle geometry leads to the highest damper's efficiency.

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“…would also allow for stable motion, however, it was shown in[44] that subharmonic motion requires special initial conditions and unrealistic material properties.Using equation(4), we can predict the critical amplitudes for the onset of motion,( ) …”

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confidence: 99%

Ratcheting and tumbling motion of Vibrots

2016

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Systems of granular rotors (Vibrots), that is, small devices that convert linear vibrational motion into rotation by frictional impact, are of scientific interest since they could reveal various types of collective behavior. Looking at an isolated Vibrot, we note at least two different dynamical modes, depending on the parameters of the vibrational driving. By means of finite element simulations, we reveal the driving mechanism for both cases which may be correspondingly identified as ratcheting and tumbling. The transition between both modes resembles period doubling in certain bouncing ball problems leading eventually to chaotic motion in such systems.

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Absence of Subharmonic Response in Vibrated Granular Systems under Microgravity Conditions

Cited by 14 publications

References 38 publications

Granular dampers: does particle shape matter?

Granular dampers: does particle shape matter?

Effect of particle shape on the efficiency of granular dampers

Ratcheting and tumbling motion of Vibrots

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