Vibroacoustic simulation of the stage of the grand concert hall of Liszt Academy

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Dr. Augusztinovicz Gusztáv Fülöp
Department of Networked Systems and Services

During the reconstruction of the Liszt Ferenc Academy of Music the vibro-acoustic analysis of the stage of the great concert hall has been suggested. The podium structure is considerably aged by now, so it should undergo a conscious redesign and replacement. In my thesis I provided acceptable results both to the architect and the structural engineer to design the new stage.

The vibro-acoustic characteristics of the old stage floor were first investigated by means of an extended measurement series. After the evaluation of these results, I created a finite element analysis model by using the MSC.Patran program, the results of which confirmed the previous measurements. During the next step I examined the changes in the frequency function by adjusting the model according to the new requirements.

It has been found that the supporting structure of the stage does not play a direct role in the acoustic radiation. Furthermore the vibrations generated in the structure by the instruments laid on the floor have only a small contribution to the sound field, but the partial absorption and secondary radiation of airborne sounds are not negligible. So a compromise can be proposed, which meets the needs of a modern concert hall and changes only a bit the acoustic characteristics of the popular old podium.


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