O'Reilly logo

Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition by Tim Mellow, Leo Beranek

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

4.15. Radiation from an oscillating sphere

We saw that the monopole point source is effectively a pulsating sphere with an infinitesimally small radius. Similarly, the dipole point source can be considered as a rigid sphere with an infinitesimally small radius oscillating back and forth along its axis. This provides us with some useful insight into the operation of a loudspeaker without any baffle or enclosure whatsoever, but unlike the more accurate circular piston in free space (see Section 13.10), it yields simple closed-form solutions for the pressure field and radiation impedance. As in the case of the pulsating sphere, the impedance can be represented by a simple equivalent circuit. We shall now consider a sphere of radius R that oscillates ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required