RU2016102993A - ACOUSTIC COMFORT ROOM METHOD - Google Patents

Claims (8)

1. A method of providing an acoustically comfortable room, namely, that the load-bearing walls are lined with sound-absorbing structures, and piece-mounted sound absorbers are installed in which sound-absorbing material is placed, and they are installed over noisy equipment, characterized in that octave sound pressure levels are first determined taking into account the maximum possible sound absorption before installing sound-absorbing structures in the workshop at workplaces in the direct sound zone according to the formula

where S _i is the imaginary surface area of the correct geometric shape surrounding the ith noise source and passing through the calculation point, m is the number of noise sources closest to the calculation point, n is the total number of noise sources in the room, taking into account the average simultaneous operation coefficient of the equipment, χ _i - coefficient taking into account the influence of the near acoustic field, Ф _i - directivity factor of the i-th noise source, dimensionless, determined according to the technical documentation for the noise source, Ψ _1-j - coefficient taking into account the violation the diffusion of the sound field in the room, B _1-j is the constant of the room after its acoustic processing, which is determined by the formula

, where A ₁ = α (S _ogre- S _reg ) is the equivalent area of sound absorption by surfaces not occupied by sound-absorbing lining; α = B / (B + S _ogre ) - the average coefficient of sound absorption in the room before its acoustic processing; B is the room constant before its acoustic treatment, m ² , α _1-j is the average sound absorption coefficient of the acoustically treated room, determined by the ratio, S _ogr = 2 [D⋅W + (D + W) ⋅H] is the total area of the enclosing surfaces of the room, m ² , while observing the following conditions: L ₁ - ΔL _pr-j - ΔL _siz ≤ ΔL _extra and L ₁ - ΔL sf _-j - ΔL _siz ≤ ΔL _extra , where ΔL _siz = L _ei - ΔL _i, L _ei - PPE effectiveness of noise in i-th octave frequency band of normative technical documentation (according to data sheet used PPE) dB, ΔL _i - correction for reliable protection against noise are taken in depending on the frequency of sound. 2. A method for providing an acoustically comfortable room according to claim 1, characterized in that a spherical sound absorber is installed comprising active and reactive sound absorbers placed on a rigid frame, the frame is made spherical in shape with an internal congruent frame with a spherical resonant cavity formed by a rigid continuous spherical shell, equidistant external perforated spherical shell, while the space between the spherical shells is filled with sound-absorbing material, and with The external perforated spherical shell is separated from the object, for example, by the ceiling of the production room, by means of an elastic-damping element that allows damping high-frequency vibrations, and is pivotally connected to a suspension made in the form of a rod, one end of which is connected to a hinge mounted on an elastic-damping element, and the other with a ring designed to fix it on the object, and a spherical resonant cavity is rigidly connected to at least one sleeve with an axial hole performing the function of the neck of the Helmholtz resonator, with an external perforated spherical shell, and the space between them is filled with a sound absorber.