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Measurement of the radiation efficiency of suspended ceilings at low frequencies using swept sine excitation and high-frequency resolution

  • It is common for timber ceiling constructions to include a suspended ceilings made of plasterboard. In order to minimize the radiation from impact excitation, especially in the low frequency range below 100 Hz, a detailed analysis of the vibration behaviour was necessary. An experimental modal analysis was carried out and the radiated sound power from the suspended ceiling was measured using a sweep sine excitation by a shaker connected to the top layer of the timber floor construction. Since the experimental modal analysis was conducted using a high frequency resolution and with a non-stationary sound field, it was necessary to check the validity of the intensity measurements by comparing it with 1/3-octave band measurements. The results show very good agreement. By this means the radiation efficiency can be measured simultaneously with an experimental modal analysis of a structure.

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Metadaten
Author:H.-M. Tröbs, Ulrich Schanda, R. Völtl
Parent Title (English):Internoise 2013
Document Type:Conference Proceeding
Language:English
Publication Year:2013
Tag:Holzbau; Schallmesstechnik
faculties / departments:Fakultät für Angewandte Natur- und Geisteswissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie