SOUND FIELD ANALYZING METHOD

摘要

PURPOSE:To reduce sharply the volume of data and a calculation time by dividing a space to be analyzed into two, and making element division uniform in an area including a sound source and gradually rough in an area distant from the sound source. CONSTITUTION:The closed space inside an imaginary outside boundary 2 provided encircling a structure 1 which includes the sound source in an infinite space is the space to be analyzed. An imaginary inside boundary 3 divides the space to be analyzed into the area 4 including the sound source and the area 5 distant from the sound source. A discrete equation is solved for sound pressure P in the area 4 as it is, so element size in element division is limited to the extent that at least variation in one wavelength is followed up. Further, the sound pressure P is expressed in the area 5 as the product of a function showing a spherical wave and a function P for correcting deviation and a discrete equation is solved for the correcting function P.