Abstract
The sound field around a finite barrier is analyzed by two- and three-dimensional boundary element methods. These results are compared with the results measured for an experimental model by a sound visualization method using three color-light-emitting diodes. In the case of two-dimensional analysis, considering the difference between the distance attenuation of the cylindrical wave caused by a line source and that of the spherical one caused by a point source, the sound pressure levels calculated are corrected to express those for the three-dimensional field approximately. For the sound field on the source side of the barrier, both of the sound pressure distributions calculated by two- and three-dimensional analyses agree fairly well with the measured ones. In the case of the opposite side to the source, the two-dimensional results are in good agreement with measured ones for lower frequencies but become inaccurate for higher frequencies. The three-dimensional results show good distribution patterns of sound pressure levels.
