ИНЖЕНЕРНЫЙ МЕТОД РАСЧЕТА ИЗОЛЯЦИИ УДАРНОГО ШУМА МНОГОСЛОЙНЫМИ МЕЖДУЭТАЖНЫМИ ПЕРЕКРЫТИЯМИ

The proposed engineering method of calculation of sound insulation of multilayer intercommunication pen-indoor. The calculation takes into account the effect on the sound insulation of cylindrical stiffness and surface density of inertial elements, as well as the stiffness of sound-proof gasket materials, which allows for rational design of the overlap. The calculation is reduced to the calculation of the frequency response of the impact noise reduction due to the multilayer structure of the floor and to the comparison of the calculated value of the index of the reduced level of impact noise with the standard. The list of necessary initial data and the validity of the calculation are given. Formulas are given to determine the boundaries of the natural oscillation frequencies within which the value of the reduced level of shock noise is calculated. The sequence of constructing the dependence of the natural oscillation frequencies of the system and reducing the level of shock noise by multi-layer inter-floor overlap is described. It is shown that above the second resonance frequency of the eigenfrequencies of the multilayer floor, the improvement of the shock noise isolation (relative to the single-layer overlap) is 24 dB per octave in the low frequency region and 12 dB per octave in the medium and high frequency region. Comparison of the calculated and measured frequency characteristics of the impact noise reduction showed a good agreement of the results obtained by the engineering calculation method with experimental studies.