Granular dampers in microgravity: sharp transition between modes of operation
Granular dampers in microgravity: sharp transition between modes of operation
复制标题
微重力下的颗粒阻尼器：操作模式之间的急剧转变
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
T. Pöschel
中科院分区：
文献类型：
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作者：
Achim Sack;Kit Windows;Michael Heckel;D. Werner;T. Pöschel
当一个装满颗粒物质的容器在微重力下受到正弦振动时，取决于振动的振幅，振动可能会表现出两种不同的动力学模式之一：在低振幅下，观察到类似气体的状态，其中颗粒相对均匀地分布在容器内，几乎与振动的相位无关。相反，对于大振幅，粒子的集体运动是有利的，称为收集和碰撞制度。这两种制度的特点是非常不同的耗散特性。最近的一个模型预测，由于振动的临界振幅的急剧转变的制度分开。在这里，我们证实了这一预测的急剧转变和临界振幅的数值通过失重条件下进行的实验。
When a container filled with granular material is subjected to sinusoidal vibration in microgravity, dependent on the amplitude of the oscillation, the granulate may exhibit one of two distinct dynamical modes: at low amplitude, a gas-like state is observed, where the particles are relatively homogeneously distributed within the container, almost independent of the phase of the oscillation. In contrast, for large amplitude, collective motion of the particles is favoured, termed collect-and-collide regime. Both regimes are characterized by very different dissipation characteristics. A recent model predicts that the regimes are separated by a sharp transition due to a critical amplitude of the vibration. Here we confirm this prediction of a sharp transition and also the numerical value of the critical amplitude by means of experiments performed under conditions of weightlessness.
影响因子：
2.6
作者：
Harth, Kirsten;Trittel, Torsten;Stannarius, Ralf
通讯作者：
Stannarius, Ralf