LOW-NOISE TECHNICAL ROOM Russian patent published in 2018 - IPC E04B1/82 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to the field of technical means for providing acoustic environmental safety by suppressing (reducing) noise emissions, produced by industrial-technological and engineering equipment, represented, in particular, by pumping, compressor stations, power plants (internal combustion engines, diesel-generator sets), ventilation and air conditioning systems, electric machines (electric motors, electric transformers), mounted inside noise generating (noise) technical rooms (building buildings). Technical room contains load-bearing enclosing rigid sound-reflecting elements in the form of walls, ceiling, floor, doorway with closed entrance door, inlet and exhaust ventilation openings forming an internal three-dimensional air cavity represented by a rectangular parallelepiped with overall dimensions A (L⋅B⋅H). It is characterized by certain physical parameters of the sound and temperature field, in which at least one is mounted, one operated noise generating technical object operating at a given steady-state high-speed operating mode of operation n_s, accompanied by physical processes of radiation of sound and heat energy. Spectral sound composition of the noise of the noise generating technical object contains the discrete values of the workers of the dominant functional frequencies f_ms, characterized by the corresponding lengths of sound waves λ_ms. At least one of the dimensions A of the internal three-dimensional air cavity of the technical room, represented by a rectangular parallelepiped with the dimensions L⋅B⋅H, satisfies the requirements of the interrelated relationship with the physical parameters of the sound and temperature fields of the internal three-dimensional air cavity of the technical room, allowing to exclude resonant frequency-modal interactions of sound radiation of a noise generating technical object with its own acoustic modes (natural frequencies of sound oscillations f_mA) of the internal three-dimensional air cavity of the technical room, defined by the expression:

,

where n_vs is an integer (natural number) of half-lengths ½λ_ms sound waves of the working dominant functional frequency f_ms sound radiation of a noise generating technical object, which fit within the limiting limits of the overall parameter A, characterizing the overall dimensions of the internal three-dimensional air cavity of the technical room (L, B, H); K_t – temperature coefficient of sound velocity correction c and sound wave length λ_ms working dominant functional frequency f_ms, radiated noise generating technical object on a given steady-state high-speed operating mode of operation n_s, in the operating temperature range of air temperature Δt°C in the internal three-dimensional air cavity of the technical room (L, B, H).

EFFECT: implementation of the claimed technical solution makes it possible to prevent the occurrence of air cavity acoustic resonances and physical phenomena of the beats of interacting acoustic signals (sound waves) with close values of the frequencies of the sound oscillations f_ms and f_mA in a technical room with noise-generating technical object installed in it.

1 cl, 30 dwg, 3 tbl