Acoustic enclosures are currently an effective way to suppress mechanical noise. They consist of a cover plate, a damping coating, and a sound-absorbing layer. A 2mm steel plate was used as a cover plate, and the measured sound insulation was 29dB (A). The thickness of the sound absorption layer is 100mm superfine glass wool. Its density is reasonable, and the best sound absorption effect of low and medium frequency is better.
Glass wool with a capacity of 15 kg/m3 was used, and an asbestos cloth was used as a cover. Through a large number of experiments, it is proved that when the piercing rate of the perforated plate of the acoustic enclosure liner is greater than 20%, there is no effect on the sound absorption performance of the sound-absorbing material. Therefore, a perforation rate of 25% was selected for the porous shield (thickness 1.5mm). The aperture was to be sealed after the soundproof cover was installed, and the full elastic hose of the gap selection was blocked, which effectively cut off the noise propagation path and eliminated the flexible connection. Vibration prevents the transmission of solid-borne sound. Due to the requirements of operation, maintenance and inspection, etc., it is necessary to open holes or pass through pipes, etc., and necessary measures must be taken to eliminate vibration and eliminate noise.
The field selection of the boiler fan is a resistive tube muffler. It converts aerodynamic noise into thermal energy through sound-absorbing lining materials, which attenuates the noise. Its cross-sectional area and the length of the draft fan outlet is 2m. In order to improve the sound absorption effect of low and medium frequency sound absorption layer thickness of the pipe wall is 100mm, the thickness of the sound absorption layer of the grille is 100mm. The wall of the cylinder is circular rather than square in order to prevent the standing wave effect and reduce the sound insulation.
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