Finite difference nearfield errors for a baffled vibrating piston

Abstract

Two-microphone finite difference errors for velocity, intensity, and radiated power were analyzed in the near- and farfield of a vibrating piston in a baffle. Since a closed form solution is not available for nearfield radiation, numerical solutions were used to obtain the sound pressure, velocity, and intensity. Newton's method was used for the numerical integration. The finite difference errors were calculated for two different intensity probe locations. These locations were in a plane parallel to the surface of the piston and on a sphere centered around the piston. The results were analyzed in terms of sound intensity and sound power measurements. In addition, experimental data were measured for comparison purposes.