Simplified procedure for estimating the acoustic performance over time of floating subfloors in terms of impact noise by the induced creep method

PIRES, H. L. Laboratory of Environmental Comfort, Energy Efficiency and Building Facilities, Institute for Technological Research of the State of São Paulo S.A., São Paulo, SP, Brazil, Professional Master of IPT, São Paulo, SP, Brazil, henriquelpires@gmail.com.br, henriquelp@ipt.br

AQUILINO, M. M. Laboratory of Environmental Comfort, Energy Efficiency and Building Facilities, Institute for Technological Research of the State of São Paulo S.A., São Paulo, SP, Brazil, aquilino@ipt.br

AKUTSU, M. Laboratory of Environmental Comfort, Energy Efficiency and Building Facilities, Institute for Technological Research of the State of São Paulo S.A., São Paulo, SP, Brazil, akutsuma@ipt.br

IKEDA, C. Y. K. Laboratory of Environmental Comfort, Energy Efficiency and Building Facilities, Institute for Technological Research of the State of São Paulo S.A., São Paulo, SP, Brazil, cristinak@ipt.br

Abstract

Within the context of subfloor systems performance concerning the impact noise, there is a concern with the behavior of these systems over time, since the creep suffered by the resilient materials that compose these systems can affect their acoustic performance. The method for evaluating this behavior is the determination of creep. Other researchers proposed a correlation between the mentioned method and the determination of compressibility method, such that, this last-mentioned method can be considered an induced creep, as well as a method that allows estimating the acoustic performance of these materials after ten years, from the resonant frequency and induced creep results. Based on this method, this work objective was to develop a simplified procedure to estimate the acoustic performance of resilient materials projected for after ten years under compression. Fourteen samples of resilient materials found in the Brazilian market were covered. A correlation was verified between the resonance frequency and the thickness of the material after application of the load of 2 kPa and application and removal of the load of 48 kPa. With this, two equations were proposed that make it possible, for preliminary analysis, eliminate the step of applying the additional load of 48 kPa, which originally requires a large apparatus.

Keywords:

deformation

induced creep

over time

dynamic stiffness

impact noise

floating subfloor

resilient materials

resonance frequency

compressibility

impact hammer

housing buildings.

References

[1] International Organization for Standardization. ISO 7626-5: Mechanical vibration and shock — Experimental determination of mechanical mobility — Part 5: Measurements using impact excitation with an exciter which is not attached to the structure. 2 ed. Geneva: Iso Central Secretariat, 2019. 28 p.

[2] International Organization for Standardization. ISO 9052-1: Acoustics - Determination of Dynamic Stiffness. Part 1: Materials Used under Floating Floor in Dwellings. 1 ed. Geneva: Iso Central Secretariat, 1989. 4 p.

[3] International Organization For Standardization. ISO 12354-2: Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 2: Impact sound insulation between rooms. 1 ed. Geneva: Iso Central Secretariat, 2017. 46 p.

[4] International Organization for Standardization. ISO 20392: Thermal - insulating materials - Determination of compressive creep.1 ed. Geneva: Geneva: ISO Central Secretariat, 2007. 17 p.

[5] International Organization for Standardization. ISO 29770: Thermal insulating products for building applications – Determination of thickness for floating floor insulating products. 1 ed. Geneva: Iso Central Secretariat, 2008. 5 p.

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