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Appl. Sci. 2018, 8(5), 703; https://doi.org/10.3390/app8050703

Vibrometry Assessment of the External Thermal Composite Insulation Systems Influence on the Façade Airborne Sound Insulation

1
STU Bratislava, Faculty of Civil Engineering, Radlinského 11, 81368 Bratislava, Slovakia
2
A&Z Acoustics s.r.o., Repašského 2, 84102 Bratislava, Slovakia
3
Laboratory of Acoustics, Soft matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Belgium
4
Versuchsanstalt TGM, Fachbereich Akustik und Bauphysik, Wexstrasse 19-23, 1200 Wien, Austria
5
KU Leuven, Faculty of Architecture, Hoogstraat 51, 9000 Gent/Paleizenstraat 65, 1030 Brussel, Belgium
This paper is based on the authors’ presentation: Measuring the sound insulation of external thermal insulation composite system (ETICS) by means of vibrometry, which was orally presented at Forum Acusticum 2017, Boston, MA, USA, 25–29 June 2017.
*
Author to whom correspondence should be addressed.
Received: 21 February 2018 / Revised: 26 March 2018 / Accepted: 30 March 2018 / Published: 2 May 2018
(This article belongs to the Section Acoustics and Vibrations)
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Abstract

This paper verifies the impact of the use of an external thermal composite system (ETICS) on air-borne sound insulation. For optimum accuracy over a wide frequency range, classical microphone based transmission measurements are combined with accelerometer based vibrometry measurements. Consistency is found between structural resonance frequencies and bending wave velocity dispersion curves determined by vibrometry on the one hand and spectral features of the sound reduction index, the ETICS mass-spring-mass resonance induced dip in the acoustic insulation spectrum, and the coincidence induced dip on the other hand. Scanning vibrometry proves to be an effective tool for structural assessment in the design phase of ETICS systems. The measured spectra are obtained with high resolution in wide frequency range, and yield sound insulation values are not affected by the room acoustic features of the laboratory transmission rooms. The complementarity between the microphone and accelerometer based results allows assessing the effect of ETICS on the sound insulation spectrum in an extended frequency range from 20 Hz to 10 kHz. The modified engineering ΔR prediction model for frequency range up to coincidence frequency of external plaster layer is recommended. Values for the sound reduction index obtained by a modified prediction method are consistent with the measured data. View Full-Text
Keywords: building acoustics; vibrometry assessment; facade airborne sound insulation; sound reduction index improvement; prediction model; external thermal composite system (ETICS) building acoustics; vibrometry assessment; facade airborne sound insulation; sound reduction index improvement; prediction model; external thermal composite system (ETICS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Urbán, D.; Roozen, N.; Muellner, H.; Zaťko, P.; Niemczanowski, A.; Rychtáriková, M.; Glorieux, C. Vibrometry Assessment of the External Thermal Composite Insulation Systems Influence on the Façade Airborne Sound Insulation. Appl. Sci. 2018, 8, 703.

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