Recently, a considerable amount of research focused on the efficiency of granular dampers (GD) has been developed 22, 23, 24, 25, 26, 27. Granular materials can also damp impacts and oscillations due to their ability to dissipate mechanical energy through inelastic collisions and friction between particles 21, 22. The maximum damping is obtained when the liquid occupies about 30% of the available space and less notorious for larger liquid volumes. The presence of the fluid does not affect the first rebound, but the second rebound is mitigated by the sloshing and collapsing of the liquid. A recent research 20 showed that the rebound of a hollow sphere can be damped when it is partially filled with a liquid. On the other hand, in some cases it is necessary to damp the impact in order to protect the bouncing object, as in the landing of a massive spacecraft in Mars exploration missions 19 (where a rover, protected by its lander structure and airbags, hits the ground and bounces several times before reaching the repose). This simple system constitutes the basis to describe the rebound of sophisticated objects and more complex systems for example, bouncing viscoelastic spheres 8, non-homogeneous balls 9, solid spheres into fluids 10, balls 11, dimers 12 and trimers 13 on vibrated plates, and vibrated granular materials 14, 15, 16, 17.Ĭertain applications require materials that minimize the loss of energy during the rebound e.g., in the design of small rubber balls in sport science 18. The bounce of a ball dropped over a solid surface is a prolific topic in physics and engineering 1, 2, 3, 4, 5, 6, 7.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |