Cylindrical acoustic wave
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Nyquist Team
Have you ever wondered why the noise from a busy highway carries much further than the shout of a single person, even if they are shouting very loudly? It’s not a matter of sheer power, but of the geometry of sound propagation. When a sound wave takes the shape of a cylinder rather than a sphere, the laws of physics make it so that energy is transported over a distance much more efficiently.
Professional Definition
A cylindrical acoustic wave is a wave whose front (surface with the same phase) is a cylindrical surface.
In acoustic engineering, this phenomenon occurs in the case of so-called linear sources. A key physical feature of a cylindrical wave is the lower drop in acoustic pressure level with distance. This drop is 3 dB for every doubling of distance from the source (in comparison: in a more common spherical wave, it is 6 dB).
This is because acoustic energy spreads over a surface growing proportionally to the radius (r), rather than to the square of the radius (r^2). This allows sound to
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