Damping force characteristics of a separated dual-chamber single-rod type damper utilizing an elastomer particle assemblage (Investigation and consideration of damping force angle dependency)

In this paper, we report the effect of the installation angle of a separated dual chamber single rod type damper using elastomer particles on the damping force characteristics. The particle assemblage damper uses soft / hard particles and suppresses vibrations by the compression reaction force of particles and the friction force between particles or between particle walls. This is attracting attention as a solution to the problem of oil leakage of oil damper. As a result of calculation using the discrete element method (DEM), in the case of only one chamber is filled with particles, when it was found that the mounting angle of the damper is made closer to the vertical from the horizontal, the particles gather at the bottom of the damper due to gravity and the movement of the particles is restricted, so that the damping force increases. In addition, when both chambers are filled with particles, the damping force that becomes larger by compressing particles to the bottom side of the damper, however, it is that by the restoring force of the particles already compressed in the other room is cancelled, so it was found that there was no significant change in damping force even if the installation angle was changed.