Acoustical improvements in Kulturhuset Oceanen using slitted low frequency absorbers

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Master Thesis
Title: Acoustical improvements in Kulturhuset Oceanen using slitted low frequency absorbers
Authors: Davidsson, Mattias
Abstract: The task was to improve the acoustic properties in the concert hall at Kulturhuset Oceanen. Measurements showed that the main problem was related to resonance frequencies around 70 and 110 Hz. There was also a peak at 40 Hz, but since the P.A. system does not excite such low frequencies, it was left without any consideration. The other two strong peaks were treated with slitted Helmholtz absorbers. The actual project did not include mounting of the full-scale absorbers; instead a prototype was constructed and built for experimentation and measurements in a reverberation chamber at Chalmers.The measurements showed that the absorber worked very well within the targeted frequency range, that is around 70 to 110 Hz. Since the absorber is mainly consisting of wood, it will also have higher absorption coefficients in the high frequency region, compared to the concrete walls that now are exposed in the concert hall. This implies that there will be a reduction of the reverberation times in the upper frequencies as well. Measurements on the prototype, together with simulations in CATT-Acoustic show a possible reduction of the reverberation time at the 125 Hz octave band with about 0.2 -0.3 seconds.
Keywords: Byggnadsteknik;Building engineering
Issue Date: 2006
Publisher: Chalmers tekniska högskola / Institutionen för bygg- och miljöteknik, Teknisk akustik
Chalmers University of Technology / Department of Civil and Environmental Engineering, Applied Acoustics
Series/Report no.: Examensarbete - Institutionen för bygg- och miljöteknik, Chalmers tekniska högskola : 2006:18
Collection:Examensarbeten för masterexamen // Master Theses

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