Abstract
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.
Highlights
Many authors have studied the influence of the parameters of the driving [1, 2], material properties and particle size [3,4,5,6] on the performance of granular dampers
We used Discrete Element Method (DEM) to perform a systematic study by investigating a diversity of particle shapes covering a broad range of shape parameter values
By means of DEM simulations under consideration of complex particle shapes, we have shown that particle shape affects the performance of granular dampers in the regime where the amplitude of oscillation is low
Summary
Many authors have studied the influence of the parameters of the driving [1, 2], material properties and particle size [3,4,5,6] on the performance of granular dampers. The role of particle shape has remained largely out of the focus of previous investigations. This role is examined in the present work by means of numerical simulations using the Discrete Element Method (DEM), which consists of simultaneously solving Newton’s equations of translational and rotational motion for all particles as described in detail in Ref. We used DEM to perform a systematic study by investigating a diversity of particle shapes covering a broad range of shape parameter values (specified below). Since granular dampers perform well in applications where the acceleration due to gravity can be neglected (as gravity tends to demobilize the granulate [1]), we focus here mainly on the study of granular dampers in microgravity conditions
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