一様でない地表面上での音響伝搬
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概要
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A theory of sound propagation based on Niessen's method is developed. The velocity potential at a given point above a boundary is expressed in the form of surface integral on the boundary. The advantage of the theory is that it is applicable not only to a homogeneous plane surface but also to a surface with irregularity or a composite surface of different kinds. Theoretical examinations are made in three cases, i. e. , a boundary of perfect reflection, a boundary of finite impedance and a boundary of finite impedance with irregularity. In the last examination, it is assumed that the boundary is almost flat but has some concaved portions distributed with a certain pattern. On this assumption, the theoretical result is found in good agreement with the experimental result measured over a turf-covered ground. A way of applying the theory to the case of a composite surface is also described. In connection with the theory, the strict mathematical formulation of Huygens principle is given.
- 社団法人日本音響学会の論文