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<p>The influence of the raised-bottom on the dissipation behavior of three-dimensional (3D) oscillating closed granular system is studied by discrete element simulation in this work. Firstly, the damping effect and motion phase states of granular balls in a flat-bottom closed container are investigated in the interested range of excitation parameters, which reveals two different high damping granular dissipation behaviors. Then, the damping characteristics of the same quantity of granular balls in flat, concave and raised bottom containers are compared, which indicates that the granular system with a 2&#xa0;mm raised-bottom exhibits relatively better damping effect. Moreover, the difference between flat-bottom and 2&#xa0;mm raised-bottom granular system in the dissipation behavior of optimal damping granules is further analyzed. Finally, the essence of enhanced damping effect of the 3D granular system by the 2&#xa0;mm raised-bottom is revealed, i.e., the fact that the change of injection mode of vibration energy into granular system caused by the raised-bottom makes it easier for ideal dense granular cluster to appear in the oscillating granular bed.</p>

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Better granular damping effect triggered by a single-raised bottom surface

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Wenzhe Li,
  • Kai Zhang,
  • Yan Chen,
  • Siqi Ma

摘要

The influence of the raised-bottom on the dissipation behavior of three-dimensional (3D) oscillating closed granular system is studied by discrete element simulation in this work. Firstly, the damping effect and motion phase states of granular balls in a flat-bottom closed container are investigated in the interested range of excitation parameters, which reveals two different high damping granular dissipation behaviors. Then, the damping characteristics of the same quantity of granular balls in flat, concave and raised bottom containers are compared, which indicates that the granular system with a 2 mm raised-bottom exhibits relatively better damping effect. Moreover, the difference between flat-bottom and 2 mm raised-bottom granular system in the dissipation behavior of optimal damping granules is further analyzed. Finally, the essence of enhanced damping effect of the 3D granular system by the 2 mm raised-bottom is revealed, i.e., the fact that the change of injection mode of vibration energy into granular system caused by the raised-bottom makes it easier for ideal dense granular cluster to appear in the oscillating granular bed.