Zhang Peng, Huang Kai, Miao Guoqing, Wei Rongjue
State key lab of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, PR China.
Ultrasonics. 2006 Dec 22;44 Suppl 1:e1479-81. doi: 10.1016/j.ultras.2006.05.196. Epub 2006 Jun 9.
In this paper, high-speed photography was used to investigate the intrinsic dynamics of subharmonious surface wave in a vertical vibrated and idealized bidimensional granular layer. Using the high-speed photography, velocity fields of the granular layer at different stages through two cycles were obtained, which show the continuous particle motions during a cycle. From the velocity fields, a crystal structure in the wave-hollow was observed, which is reported for the first time. Furthermore, quantitative results of kinetic energy distribution in the layer were calculated, which shows temporal correspondence with the evolution of the wave pattern.
在本文中，利用高速摄影技术研究了垂直振动的理想化二维颗粒层中次谐波表面波的内在动力学。通过高速摄影，获得了颗粒层在两个周期不同阶段的速度场，这些速度场展示了一个周期内颗粒的连续运动。从速度场中，观察到了波谷中的一种晶体结构，这是首次报道。此外，还计算了颗粒层中动能分布的定量结果，其显示出与波型演化的时间对应关系。
