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      Basic considerations on the practical method for predicting sound insulation performance of a single-leaf window

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            As a basic study of a practical method for predicting sound insulation performance of windows, this report presents a study of the sound reduction index of windows with single glazing below a critical frequency. First, results calculated by an existing theory for a single plate for the sound reduction indices are compared with measured results of actual windows to assess the theory’s applicability for evaluating the sound insulation performance of windows. Next, a regression analysis is employed to measured results of a certain number of actual windows to explore a further development of a more practical prediction. The following findings were obtained: (1) Sound reduction indices of actual fixed windows are predictable using Sewell’s transmission theory for a single plate. However, sound reduction indices of openable windows, especially those of sliding windows, are affected strongly by window frame gaps. Therefore, predicting sound reduction indices of all windows accurately is difficult if using only one theory. (2) The frequency slope of the window reduction index is much lower than that of the mass law. Regression analyses indicate that the frequency slope of the reduction index of all examined windows is 3.0 dB per octave, on average.


            Author and article information

            UCL Open: Environment Preprint
            UCL Press
            8 April 2021
            [1 ] YKK AP Inc., YKK AP R&D Centre, 1 Ogyu, Kurobe, Toyama, Japan
            [2 ] Environmental Acoust. Lab., Graduate School of Engineering, Kobe University 1-1 Rokkodai, Nada, Kobe, Hyogo, Japan
            Author information

            This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY) 4.0 https://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

            : 18 March 2021
            : 20 April 2021
            None. None.

            The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
            architectural acoustics,mass law,measurement,single glazing,sound insulation,window,Built environment


            Date: 21 April 2021

            Handling Editor: Dr Francesco Aletta

            Editorial decision: Accept. This revised article has been accepted following peer review and it is suitable for publication in UCL Open: Environment.

            2021-04-21 09:11 UTC

            Date: 8 April 2021

            Handling Editor: Dr Francesco Aletta

            The article has been revised, this article remains a preprint article and peer-review has not been completed. It is under consideration following submission to UCL Open: Environment Preprint for open peer review.

            2021-04-21 09:10 UTC

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