August 2, 2019 Dataset Open Access

Mathieu Gaborit; Luc Jaouen; Olivier Dazel; Peter Göransson

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    <subfield code="a">acoustic films</subfield>
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    <subfield code="a">impedance tube measurement</subfield>
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    <subfield code="u">Matelys Research Lab, Vaulx-en-Velin, France</subfield>
    <subfield code="0">(orcid)0000-0002-3141-800X</subfield>
    <subfield code="a">Luc Jaouen</subfield>
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    <subfield code="u">LAUM UMR CNRS 6613, Le Mans Université, Le Mans, France</subfield>
    <subfield code="0">(orcid)0000-0002-0534-000X</subfield>
    <subfield code="a">Olivier Dazel</subfield>
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    <subfield code="u">MWL, KTH Royal Institute of Technology, Stockholm, Sweden</subfield>
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    <subfield code="a">Peter Göransson</subfield>
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    <subfield code="u">LAUM UMR CNRS 6613, Le Mans Université, Le Mans, France  &amp; MWL, KTH Royal Institute of Technology, Stockholm, Sweden</subfield>
    <subfield code="0">(orcid)0000-0001-9071-6325</subfield>
    <subfield code="a">Mathieu Gaborit</subfield>
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    <subfield code="a">Statistical characterisation and responses of acoustic screens and two-layers systems</subfield>
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    <subfield code="a">&lt;p&gt;The present dataset contains measurements of the acoustic response of screens in an impedance tube with different backings. It includes as well the characterised parameters for the screens and backings.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;License&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;This dataset is released under Creative Commons with Attribution (CC BY). Any reutilisation of the present dataset in scholarly works must properly cite this work and its authors:&lt;/p&gt;

&lt;pre&gt;&lt;code&gt;Statistical characterisation and responses of acoustics screens and two-layers systems
M. Gaborit, L. Jaouen, O. Dazel, P. Göransson
DOI: 10.5281/zenodo.3358921
&lt;/code&gt;&lt;/pre&gt;

&lt;p&gt;&lt;strong&gt;Protocol&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;Two different films (one woven and one non-woven) were sampled 40 times in order to characterise their parameters in an impedance tube. Sampling is manual, the tube inner diameter is 44.44mm and the samples are cut to a slightly large size in order to be clamped inside the tube for measurements.&lt;/p&gt;

&lt;p&gt;The films are tested in different configurations including some with backings. Two types of backings are considered (melamine and glass wool). These backings are also characterised using 3 and 2 samples respectively. When measuring the response of the film on a backing only 20 samples of each film were used.&lt;/p&gt;

&lt;p&gt;All measurements span the [4, 4520] Hz band. The setup is calibrated anew before each measurement session.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Films&amp;#39; characterisation&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The films are clamped in the seam between the two parts of the tube, a 200mm air plenum is formed downstream and ends with a rigid backing. The samples for each type of film are measured within 4h.&lt;/p&gt;

&lt;p&gt;The characterisation procedure implements the method described in the following reference:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Jaouen L. B&amp;eacute;cot F.-X. JASA 129(3) pp. 1400 - 1406, 2011&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;Backings&amp;#39; characterisation&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The sample and backing piston are placed to give a rigid backing and have the sample&amp;#39;s surface flush with the seam between the two parts of the tube. In the case of the glass wool, the material has a slight (below millimetre) embossing and the supporting surface is placed flush with respect to the seam (the top of the embossing is not considered as the sample surface).&lt;/p&gt;

&lt;p&gt;The characterisation procedure implements the method described in the following references:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Olny, X. &amp;amp; Panneton, R. JASA 123(2) pp. 814 &amp;ndash; 824, 2008&lt;/li&gt;
	&lt;li&gt;Panneton R. &amp;amp; Olny, X. JASA 119(4), p. 2027, 2006&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;Response measurements&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;To measure responses of the film/backing systems, the backing are placed as described in the previous paragraph. The film is clamped in the seam as described in the &amp;quot;Films&amp;#39; characterisation&amp;quot; section. A plastic grid with thin struts is placed upstream to prevent the film from bending. This setup allows for easily changing the film without replacing the backing sample. Films&amp;#39; samples 1 to 20 are used for response measurements. Measurement of the grid response on a rigid backing and an air plenum of 200mm are provided for reference.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Hardware&lt;/strong&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href="http://www.mecanum.com/en/products/impedance-tube/impedance-and-transmission-tube-3-mic/"&gt;Mecanum 3-microphones tube, diameter: 44.44mm&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;Software&lt;/strong&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href="http://tubecell.matelys.com/"&gt;Matelys TubeCell&lt;/a&gt; (rig control)&lt;/li&gt;
	&lt;li&gt;&lt;a href="http://rokcell.matelys.com/"&gt;Matelys RoKCell&lt;/a&gt; (characterisation)&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;The piece of software controlling the rig implements a 3-microphones technique described in the following references:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Iwase T. Izumi Y. J. Acoust. Soc. Jpn J 52(6) pp. 411&amp;ndash;419, 1996 (in Japanese)&lt;/li&gt;
	&lt;li&gt;Iwase T. Izumi Y. Kawabata R. in proc. Internoise, 1998 (Christchurch, New Zealand)&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;Structure of the datasets and files&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The present dataset comprises two parts. The actual traces and associated measurement parameters as exported from TubeCell are found in the directory &lt;code&gt;measurements&lt;/code&gt;. The results from the characterisation process as exported with RoKCell are in the &lt;code&gt;characterisations&lt;/code&gt; folder. These results were augmented with direct measurements of the weights and thickness of the samples (both for the films and the backings).&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Measurements&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The measurements are stored in the &lt;code&gt;measurements&lt;/code&gt; directory. There are several sub-directory for each of the measurement sessions:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;code&gt;backings&lt;/code&gt;: measurements for the caracterisation of the two backings (all samples, with and without grid)&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;grid&lt;/code&gt;: measurements of the grid alone on a rigid backing and with a 200mm air plenum&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;nonwoven_alone&lt;/code&gt;: measurements for the caracterisation of the non-woven film on a 200mm air plenum, no grid (all 40 samples)&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;woven_alone&lt;/code&gt;: measurements for the caracterisation of the woven film on a 200mm air plenum, no grid (all 40 samples)&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;nonwoven_on_glasswool&lt;/code&gt;: measurements of the response of 20 non-woven film samples clamped with a grid upstream and the same glass wool sample downstream on a rigid backing&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;nonwoven_on_melamine&lt;/code&gt;: measurements of the response of 20 non-woven film samples clamped with a grid upstream and the same melamine sample downstream on a rigid backing&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;woven_on_glasswool&lt;/code&gt;: measurements of the response of 20 woven film samples clamped with a grid upstream and the same glass wool sample downstream on a rigid backing&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;woven_on_melamine&lt;/code&gt;: measurements of the response of 20 woven film samples clamped with a grid upstream and the same melamine sample downstream on a rigid backing&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Each measurement is stored into a &lt;code&gt;.irk&lt;/code&gt; &lt;em&gt;and&lt;/em&gt; a &lt;code&gt;.rok&lt;/code&gt; file. The first one contains some meta-data on the measurement process, the second contains the actual traces.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Structure of irk files&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The &lt;code&gt;.irk&lt;/code&gt; files contain the following meta-data:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Date&lt;/li&gt;
	&lt;li&gt;Medium ID&lt;/li&gt;
	&lt;li&gt;Thickness&lt;/li&gt;
	&lt;li&gt;Size of the air plenum&lt;/li&gt;
	&lt;li&gt;Measure parameter l&lt;/li&gt;
	&lt;li&gt;Measure parameter s&lt;/li&gt;
	&lt;li&gt;Sampling frequency&lt;/li&gt;
	&lt;li&gt;Tube radius [m]&lt;/li&gt;
	&lt;li&gt;Average 1&lt;/li&gt;
	&lt;li&gt;Average 2&lt;/li&gt;
	&lt;li&gt;Temperature [&amp;deg;C]&lt;/li&gt;
	&lt;li&gt;Atmospheric pressure [Pa]&lt;/li&gt;
	&lt;li&gt;Humidity [%]&lt;/li&gt;
	&lt;li&gt;High cut-off frequency (generator) [Hz]&lt;/li&gt;
	&lt;li&gt;Low cut-off frequency (generator) [Hz]&lt;/li&gt;
	&lt;li&gt;Position of the cavity microphone&lt;/li&gt;
	&lt;li&gt;Comments&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;Structure of rok files&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The &lt;code&gt;.rok&lt;/code&gt; files contain the following vector (column-major). The first line is to be omitted when reading the files, it contains the columns title. The columns are these:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Frequency (Hz)&lt;/li&gt;
	&lt;li&gt;Absorption coefficient&lt;/li&gt;
	&lt;li&gt;Real part of the reflection coefficient&lt;/li&gt;
	&lt;li&gt;Imaginary part of the reflection coefficient&lt;/li&gt;
	&lt;li&gt;Real part of the normalised surface impedance&lt;/li&gt;
	&lt;li&gt;Imaginary part of the normalised surface impedance&lt;/li&gt;
	&lt;li&gt;Real part of the transfer function&lt;/li&gt;
	&lt;li&gt;Imaginary part of the transfer function&lt;/li&gt;
	&lt;li&gt;Real part of the normalised density&lt;/li&gt;
	&lt;li&gt;Imaginary part of the normalised density&lt;/li&gt;
	&lt;li&gt;Real part of the normalised compressibility&lt;/li&gt;
	&lt;li&gt;Imaginary part of the normalised compressibility&lt;/li&gt;
	&lt;li&gt;... frequency response functions used to compute the previous quantities&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;Characterisations&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The directory &lt;code&gt;characterisations&lt;/code&gt; contains YAML 1.2 files created from the output files of the characterisation software, exploiting the measurement data. There are three subdirectories:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;code&gt;backings&lt;/code&gt; contains the characterisation of the backings (each sample and an average file)&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;nonwoven&lt;/code&gt; contains the characterisation of the non-woven film (each sample and an average file)&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;woven&lt;/code&gt; contains the characterisation of the woven film (each sample and an average file)&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;&lt;strong&gt;More information&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;For further inquiry write to gaborit at kth dot se&lt;/p&gt;</subfield>
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