Kosuke TOGASHI

Development of Noise propagation model using Cellular Automaton

Yasuyuki MIYAKI

This research developed the noise propagation model using Cellular Automata (CA) method. The CA method is mainly used to calculate for the fluid propagation, the traffic flow and the phenomena of nature. CA analysis models are calculated by a local interaction rule. This rule is composed of a cell which an analytic area was divided into. The cell's shape is a square. T.KOMATSUZAKI et al. has studied acoustic wave propagation using CA method. They have testified CA method can render the form of acoustic wave propagation. In this study, the local interaction rule is made in view of the finite difference method. However, they haven't compared the analytic solutions with the calculated solutions for CA method. Accordingly, the calculated solutions using CA method is compared with some analytic solutions. The wave equation is used for the analytic solution in the one-dimensional acoustic pipe. The analytic solutions for attenuation in distance were obtained from a theory in the two-dimensional. About diffraction of attenuation in the two-dimensional, the analytic solutions were used to Fresnel-Kirchhoff's theory of diffraction and chart of Maekawa. These results were confirmed no great difference between the analysis solutions and the noise propagation solutions.