Modeling of Granular Damper Using Cellular Automata
Toshihiko KOMATSUZAKI, Hidenori Sato, Yoshio IWATA, Shin MORISHITA · TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C · 2003
The present paper deals with flow simulations of granular materials moving inside container using Cellular Automata (CA). CA is a class of computer modeling techniques, which consists of discrete unit elements arranged uniformly on spaces, each of which can vary within a finite set of values to express the physical state of the components of the system. The time of evolution of the element state is performed synchronously according to local neighbor rules, instead of governing equations, taking into account the state of the element itself and its nearby elements. Compared with the conventional method such as DEM, it is addressed that the modeling techniques with CA provide advantages on the point of computation efficiency and numerical stability due to the discrete treatment of time and space. In this study, the damping characteristics of a granular damper is investigated numerically by Cellular Automata model and also by DEM, where a container which incorporates granular materials is attached to the mass of one-DOF vibrating system. The container is treated two-dimensionally with thickness identical to a diameter of particle. The simulated particle motions and the damping effects obtained by CA model is compared with DEM solution as well as experimental results, and the present CA model is evaluated in qualitative aspects.