Sasaki Hirotaka
Analysis of applicability to the road noise of the three-dimensional noise propagation analysis using the cellular automata method
Miyaki Yasuyuki
The noise problems in recent Japan extend to the problem of the life noise as well as the conventional highway, Shinkansen, railroad, airport, factory. The noise problems are one of the environmental problems that people are highly concerned with. As for the predictive technique about the noise propagation, an experiment was important, and the technique by the numerical analysis was not performed very much. Therefore I analyzed noise propagation using the cellular automata method which were a representative method of the bottom up technique (the following CA method).
Because CA analyzed an injection sound source only as a pure tone in the past study, I needed time and trouble for calculation of the analysis sound pressure. Therefore collation did the usefulness of the three dimensions CA model that I made a complex tone sound source, and considered a new injection sound source condition to be able to approach an available model in practical use more. And I performed a comparison with analysis sound pressure calculated by actual survey sound pressure of the vehicle noise that an outdoor experiment provided and three-dimensional CA analysis and inspected applicability to the road noise of the three dimensions noise propagation analysis by the CA method.
As a result, I understood that I received it and could predict the sound pressure of the sound point directly when I assumed complex tone a direct input sound source. The analysis sound pressure that I calculated using the three-dimensional CA model and the actual survey sound pressure by the experiment had very high consistency. Thus, I understood that the three-dimensional noise propagation analysis using the CA method had applicability to the road noise
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