一次元対称形周期構造壁面による音波反射特性 : 壁面による音波反射特性に関する研究その1

概要

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This study presents the reflection characteristics of different wall types whose surfaces are periodically and symmetrically corrugated in one direction. So far on the simulation of sound field in a hall, the reflection from the wall with complicate surface has been considered to be perfectly diffuse or a mixture of partially diffuse and partially specular. The results studied following these idea is hardly used in practice. And recently many researchers in architectural acoustics have reported that the lateral sound reflections to the listening point is very important for getting better hall acoustics. From these facts, it is very meaningful to explain the relationship between reflection characteristics and the structure of the wall. In this study many different shapes of wall cross-sections, let say, rectangular waves, repetition of arcs, sine waves, trianguler waves and Schroeder's quadratic residue sequences, were examined and the results of reflection characteristics were illustrated. As the results, it is found that the repetition of arcs has very nice reflection characteristics as a diffuser contrary to the expectation of the reflection characteristics of Schroeder's diffuser.
1991-10-30