Radiation of sound Radiation of sound from structures occurs most efficiently when there is a net volume velocity of the structure surface into the fluid. The process of radiation can be described using radiation modes. Radiation modes are the assumed forms of the volume velocity which couple in independent ways the radiated acoustic field.
The following animations illustrate the radiation of sound waves from a vibrating source in 2-D. The source is a long cylinder which is oscillating in the radial direction only (all vibrations along the length of the cylinder are ignored).
The sound field of a dipole is the same as for two identical but opposite phase monopoles.
The sound field of a quadrupole is the same as for two identical but opposite phase dipoles.
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