On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements
The article focuses on the determination of the acoustic properties (sound transmission loss, sound absorption and transmission coefficient under acoustic plane wave excitation) of membrane-type of specimens by means of a combination of incident plane wave sound pressure and membrane surface displac...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/21/10357 |
| _version_ | 1797512820897611776 |
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| author | Daniel Urbán N. B. Roozen Vojtech Jandák Marek Brothánek Ondřej Jiříček |
| author_facet | Daniel Urbán N. B. Roozen Vojtech Jandák Marek Brothánek Ondřej Jiříček |
| author_sort | Daniel Urbán |
| collection | DOAJ |
| description | The article focuses on the determination of the acoustic properties (sound transmission loss, sound absorption and transmission coefficient under acoustic plane wave excitation) of membrane-type of specimens by means of a combination of incident plane wave sound pressure and membrane surface displacement information, measuring the sound pressure with a microphone and the membrane displacement by means of a laser Doppler vibrometer. An overview of known measurement methods and the theoretical background of the proposed so-called mobility-based method (MM) is presented. The proposed method was compared with the conventional methods for sound transmission loss and absorption measurement in the impedance tube, both numerically and experimentally. Finite element model (FEM) simulation results of two single layer membrane samples of different shape configurations were compared, amongst which six different variations of the backing wall termination. Four different approaches to determine the sound transmission loss and two methods to determine sound absorption properties of the membranes were compared. Subsequently, the proposed method was tested in a laboratory environment. The proposed MM method can be possibly used to measure the vibro-acoustic properties of building parts in situ. |
| first_indexed | 2024-03-10T06:06:06Z |
| format | Article |
| id | doaj.art-f27876c200f0430d945ec9368612f0e4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T06:06:06Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-f27876c200f0430d945ec9368612f0e42023-11-22T20:31:40ZengMDPI AGApplied Sciences2076-34172021-11-0111211035710.3390/app112110357On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface DisplacementsDaniel Urbán0N. B. Roozen1Vojtech Jandák2Marek Brothánek3Ondřej Jiříček4Department of Physics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague, Czech RepublicDepartment of Physics and Astronomy, Soft Matter and Biophysics, Laboratory of Acoustics, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, BelgiumDepartment of Physics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague, Czech RepublicDepartment of Physics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague, Czech RepublicDepartment of Physics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague, Czech RepublicThe article focuses on the determination of the acoustic properties (sound transmission loss, sound absorption and transmission coefficient under acoustic plane wave excitation) of membrane-type of specimens by means of a combination of incident plane wave sound pressure and membrane surface displacement information, measuring the sound pressure with a microphone and the membrane displacement by means of a laser Doppler vibrometer. An overview of known measurement methods and the theoretical background of the proposed so-called mobility-based method (MM) is presented. The proposed method was compared with the conventional methods for sound transmission loss and absorption measurement in the impedance tube, both numerically and experimentally. Finite element model (FEM) simulation results of two single layer membrane samples of different shape configurations were compared, amongst which six different variations of the backing wall termination. Four different approaches to determine the sound transmission loss and two methods to determine sound absorption properties of the membranes were compared. Subsequently, the proposed method was tested in a laboratory environment. The proposed MM method can be possibly used to measure the vibro-acoustic properties of building parts in situ.https://www.mdpi.com/2076-3417/11/21/10357membranesacousticsmeasurement methodtransmission losssimulationsexperiment |
| spellingShingle | Daniel Urbán N. B. Roozen Vojtech Jandák Marek Brothánek Ondřej Jiříček On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements Applied Sciences membranes acoustics measurement method transmission loss simulations experiment |
| title | On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements |
| title_full | On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements |
| title_fullStr | On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements |
| title_full_unstemmed | On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements |
| title_short | On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements |
| title_sort | on the determination of acoustic properties of membrane type structural skin elements by means of surface displacements |
| topic | membranes acoustics measurement method transmission loss simulations experiment |
| url | https://www.mdpi.com/2076-3417/11/21/10357 |
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