1984 年 40 巻 6 号 p. 407-413
High-frequency acoustical pressure fields on a surface exicited by a line source located on the semicylindrical concave rigid wall are analyzed by three methods:1) acoustical ray and canonical integral representation, 2) acoustical ray and mode representation, and 3) near fields representation, with numerical evaluation results. Acoustical pressure fields in all of three representations expressed as functions of frequencies, cylinder radius, and distances between source and observation points can be represented in a universal and simple form. A simple relation to obtain acoustical pressure fields for any combination of frequency and radius from high-frequency acoustical pressure fields for a specific combination is derived. A hybrid ray-mode fields representation is deduced from the infinite ray series constructed by a ray tracing method and is discussed with error evaluation.