### Abstract

In many applications of noise control engineering, knowledge about the sound-absorbing properties of acoustically
reacting surfaces is essential. Being able to measure sound absorption of surfaces in-situ, i.e. at the site but also for the
actual sound source, is very useful and would eliminate the need for laboratory measurements.
This now seems possible using a new quantity called the total intensity which can be determined if we know the sound
pressure and particle velocity in a certain direction. For plane waves, it can be proven that this quantity is the sum of the
incident- and reflected sound intensity in that direction. As the active intensity is also known, the incident- and reflected
intensity can be calculated.
Thus, one obtains the spatially averaged sound absorption coe cient of a surface (in direction n) by measuring the
sound pressure and the particle velocity (in direction n) near that surface and by determining the active- and the incident
intensity in a spatially averaged sense.
In the paper the theory behind the method will be described, preliminary experimental results and some simulation
results will be shown. The paper will conclude with an outlook of future research.

Original language | English |
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Title of host publication | DAGA 2011 |

Editors | M. Klemenz |

Place of Publication | Berlin, Germany |

Publisher | DEGA (www.dega-akustik.de) |

Pages | 1-2 |

Publication status | Published - 21 Mar 2011 |

Event | 37. Jahrestagung für Akustik, DAGA 2011 - Heinrich-Heine-Universität, Dusseldorf, Germany Duration: 21 Mar 2011 → 24 Mar 2011 Conference number: 37 |

### Publication series

Name | |
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Publisher | DEGA (www.dega-akustik.de) |

### Conference

Conference | 37. Jahrestagung für Akustik, DAGA 2011 |
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Abbreviated title | DAGA |

Country | Germany |

City | Dusseldorf |

Period | 21/03/11 → 24/03/11 |

### Keywords

- Onderzoek van algemene industriele aardMechanical engineering and technology
- IR-76411
- METIS-274749

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## Cite this

Kuipers, E. R., Wijnant, Y. H., & de Boer, A. (2011). Theory and application of a new method for the in-situ measurement of sound absorption. In M. Klemenz (Ed.),

*DAGA 2011*(pp. 1-2). Berlin, Germany: DEGA (www.dega-akustik.de).