METHOD FOR SOUNDPROOFING EQUIPMENT Russian patent published in 2018 - IPC G10K11/00 

FIELD: construction; acoustics.

SUBSTANCE: invention relates to a method for soundproofing equipment with broadband noise attenuation. Method comprises installing a sound-insulating enclosure on the floor of a building on vibration-proof supports made of elastic material. Lining it from the inside with a sound-absorbing element. Enclosure is made in form of a rectangular parallelepiped with a recess in its lower face for the base of the process equipment. Base of process equipment is installed on vibration-proof supports. Supports are based on the floor of the building. Between the base of the process equipment and the recess in the lower face of the rectangular parallelepiped, a gap is made to prevent the transmission of vibrations from the process equipment to the sound-insulating enclosure. Said enclosure has ventilation ducts for preventing overheating of the equipment. Internal walls of the ventilation ducts are treated with a sound-absorbing material and an acoustically transparent material of the "poviden" type. Sound-absorbing element is fixed to the inner surface of the sound-insulating enclosure and is made in form of smooth (14) and perforated (15) surfaces between which a multi-layer sound-absorbing structure is placed. Calculation of the required sound insulation of the cover, as an unpressurised enclosure, is carried out according to the following relationship: , where R_kozh.tr – required sound insulation of the cover, dB; R_si – average sound insulation of the solid part of enclosures of the i-th cover, dB; is the reverberation coefficient of sound absorption inside the i-th cover, where α_o is the reverberation coefficient of sound absorption for enclosures without sound-absorbing material; α_m is the reverberation coefficient of sound absorption of sound-absorbing material; ∑S_m is the area of application of sound-absorbing material, m²; τ_i is the energy transmission coefficient of sound through the muffler of the process hole (for a simple hole without a muffler τ_i=1); ∑S_oi is the total area of process holes for the i-th cover of the machine, m²; ∑S_i is the total area of the continuous part of the enclosure, m². Multi-layer sound-absorbing structure of the sound-absorbing element is made with resonant inserts and is disposed in smooth prismatic surfaces (18) of continuous sections (16) and through resonance holes (23) and (24), serving as the mouths of Helmholtz resonators, they are connected to a layer made of foamed sound absorbing material. Frequency band for damping the sound energy of a multi-layer sound-absorbing structure is determined by the diameter and the number of resonant holes (23) and (24).

EFFECT: higher efficiency of noise suppression.

1 cl, 2 dwg