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Helically-driven granular mobility and gravity-variant scaling relations

机译:螺旋驱动的颗粒迁移率和重力变比例关系

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This study discusses the role and function of helical design as it relates to slippage during translation of a vehicle in glass bead media. We show discrete element method (DEM) and multi-body dynamics (MBD) simulations and experiments of a double-helix Archimedes screw propelled vehicle traveling in a bed of soda-lime glass beads. Utilizing granular parameters from the literature and a reduced Young's modulus, we validate the set of granular parameters against experiments. The results suggest that MBD-DEM provides reliable dynamic velocity estimates. We provide the glass, ABS, and glass–ABS simulation parameters used to obtain these results. We also examine recently developed granular scaling laws for wheels applied to these shear-driven vehicles under three different simulated gravities. The results indicate that the system obeys gravity granular scaling laws for constant slip conditions but is limited in each gravity regime when slip begins to increase.
机译:这项研究讨论了螺旋设计的作用和功能,因为它与车辆在玻璃珠介质中平移时的打滑有关。我们展示了离散元素方法(DEM)和多体动力学(MBD)模拟以及在钠钙玻璃珠床上行驶的双螺旋阿基米德螺旋推进车的实验。利用文献中的颗粒参数和降低的杨氏模量,我们针对实验验证了一组颗粒参数。结果表明,MBD-DEM提供了可靠的动态速度估计。我们提供用于获得这些结果的玻璃,ABS和玻璃–ABS模拟参数。我们还研究了最近开发的应用于三种剪切重力下的这些剪切驱动车辆的车轮的粒度缩放定律。结果表明,对于恒定的滑移条件,该系统遵循重力粒度缩放定律,但当滑移开始增加时,在每个重力范围内都受到限制。

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