Built-in perforated plate type Helmholtz resonator and low-frequency broadband sound absorbing structure based on Helmholtz resonator
A resonator and perforated plate technology, applied in the field of low-frequency broadband sound-absorbing structures to achieve effective noise reduction
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[0032] Such as Figure 1 ~ Figure 4 As shown, in the low-frequency broadband sound-absorbing structure based on the built-in perforated plate Helmholtz resonator in this embodiment, eight cavity resonators are arranged in the frame 9, and four of the eight cavity resonators are Helmholtz resonators. Helmholtz resonators, and the rest are built-in perforated plate Helmholtz resonators; the four Helmholtz resonators are respectively denoted as the first Helmholtz resonator 1, the second Helmholtz resonator 2, and the third Helmholtz resonator. Helmholtz resonator 3 and fourth Helmholtz resonator 4; first Helmholtz resonator 1, second Helmholtz resonator 2, third Helmholtz resonator 3 and fourth Helmholtz resonator The diameters of the small holes 10 on the surface of the Holtz resonator 4 are 1.5mm, 1.4mm, 1.4mm and 1.4mm respectively, and the thicknesses are 41mm, 30mm, 25mm and 21mm respectively; the four built-in perforated plate Helmholtz resonators are all A partition 12 i...
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