Results of stability experiments on different sizes of particles.

<p>The horizontal axis shows the maximum acceleration (cm/s²) within back-and-forth motion. The blue, red, and green lines show the results of 0.6 mm, 1.0 mm, and 2.0 mm, respectively. (Left) The vertical axis shows the average number of times (the duration divided by the periodic time). (Right) The vertical axis shows the average duration of suspension [s]. Both show the same experimental results.