Результаты (
английский) 3:
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for cylindrical horns whose diameter is greater than about 0.5 * wavelength (about 5 to 20 khz), longitudinal slots must be used to reduce the transverse coupling due to the poisson effect. such slots are usually radial, although other configurations are sometimes useful. without such slots the harp will either have very uneven amplitude across the face or may not resonate in a nonaxial manner. Slotted cylindrical horns generally have low to moderate gain (1: 1 to 2: 1). Cylindrical horns are used for plunge welding.
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