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The effect of an absorbent lining on the natural frequencies and modal damping factors of a small room

✍ Scribed by A. Craggs; C.J. Buma

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
480 KB
Volume
28
Category
Article
ISSN
0003-682X

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✦ Synopsis

This paper gives the results of experiments conducted on two enclosures, one a rectangular box and the other of an irregular geometry representing the interior space of a car. In the experiments, the interior walls were lined with an absorbent material and the natural frequencies and damping factors of the lowest modes were measured as the area of the material was increased. As might be expected, the damping factors were increased, but the natural frequencies were reduced by 16%--a major part being due to the change in mode shape when there was a complete lining in place. The results presented in this paper should be applicable to the interior acoustics of passenger vehicles.

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