ИНЖЕНЕРНЫЙ МЕТОД РАСЧЕТА ИЗОЛЯЦИИ УДАРНОГО ШУМА МЕЖДУЭТАЖНЫМИ ПЕРЕКРЫТИЯМИ С ПОЛАМИ ИЗ ДРЕВЕСНЫХ МАТЕРИАЛОВ

Abstract

An engineering method for calculating shock noise isolation by floor-to-floor overlappings with wood-based materials is proposed. The calculation considers overlaps with floors made of wood materials laid on glue and with floors laid on an elastic substrate. The calculation takes into account the effect on sound insulation of the surface density and stiffness of the floor covering material and the sound insulation layer. The calculation is reduced to calculating the frequency characteristic of reducing the impact noise level due to the construction of a floor made of wood materials and comparing the calculated value of the index of the reduced impact noise level with the standard ones. The list of necessary input data and the sequence of calculation execution is given. Approximate formulas for calculating the frequencies that limit the application of computational models of the overlaps under consideration are compiled. Equations and approximate formulas are given for determining the critical (antiresonance) and resonant frequencies of vibrations, one -, two-and three-layer overlaps, and their values are determined for various mechanical and geometric parameters of layers. Frequency ranges of growth and decrease of shock noise level by these overlaps are determined. Comparison of the calculated and measured frequency characteristics of shock noise reduction showed a good correspondence of the results obtained by the engineering method of calculation with experimental studies. The developed practical recommendations for improving the isolation of shock noise between floors with floors made of wood materials, used in the construction of civil buildings, can increase acoustic comfort in buildings under construction and under reconstruction.