论文标题

分析在符合摩擦的表面上强烈旋转球弹跳的点接触模型

Analysis of point-contact models of the bounce of a hard spinning ball on a compliant frictional surface

论文作者

Biber, Stanisław W., Champneys, Alan R., Szalai, Robert

论文摘要

受高尔夫球场的互动的启发,本文试图理解可以将球模仿为刚性球体和表面的球的弹跳,因为除了库仑摩擦外,还提供了弹性塑料接触力。提出了一般的公式,该公式将弹跳的有限时间间隔从触摸到升降机进行建模。分析的关键是了解反弹过程中滑动和滚动之间的过渡。从刚体的限制开始,具有恢复原状的能量或泊松系数,这表明在这种情况下不能捕获接触阶段的滑移反转,这将概括为纯正常依从性。然而,引入线性切向刚度和阻尼确实可以使滑动逆转。该结果扩展到一般弱的非线性正常和切向依从性。使用FILIPPOV的分段平滑系统理论的分析导致一个自然限制的论点,即在滚动时升起是非通用的,并且几乎所有升级的轨迹都可以在滑移条件下进行。此外,在传入速度和自旋的空间中,有一个编成imensimension-One的表面,可以将带有反旋转的球从Topspin抬起的球中脱落。将结果与最新的高尔夫球弹跳实验测量进行了比较,该理论被证明可以捕获数据的主要特征。

Inspired by the turf-ball interaction in golf, this paper seeks to understand the bounce of a ball that can be modelled as a rigid sphere and the surface as supplying an elasto-plastic contact force in addition to Coulomb friction. A general formulation is proposed that models the finite time interval of bounce from touch-down to lift-off. Key to the analysis is understanding transitions between slip and roll during the bounce. Starting from the rigid-body limit with a an energetic or Poisson coefficient of restitution, it is shown that slip reversal during the contact phase cannot be captured in this case, which result generalises to the case of pure normal compliance. Yet, the introduction of linear tangential stiffness and damping, does enable slip reversal. This result is extended to general weakly nonlinear normal and tangential compliance. An analysis using Filippov theory of piecewise-smooth systems leads to an argument in a natural limit that lift-off while rolling is non-generic and that almost all trajectories that lift off, do so under slip conditions. Moreover, there is a codimension-one surface in the space of incoming velocity and spin which divides balls that lift off with backspin from those that lift off with topspin. The results are compared with recent experimental measurements on golf ball bounce and the theory is shown to capture the main features of the data.

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