作者: Eugen Skudrzyk
DOI: 10.1007/978-3-7091-8255-0_22
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摘要: Sound propagation in cylindrical ducts or thin layers of fluid, sound radiation cylinders, and a great number other interersting problems can be solved by using coordinates. These solutions depend on the distance r from an axis — called z axis, azimuth φ, coordinate. Boundary conditions are usually specified for surfaces = const, possibly φ const.