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F. Dolezal, M. Neusser, H. Müllner, M. Teibinger:
"ACA - New Research and Testing Competence for Timber Constructions with a focus on low frequencies in Austria";
Vortrag: Euronoise 2015, Maastricht; 01.06.2015 - 03.06.2015; in: "How to create quietness, Proceedings of Euronoise 2015", (2015), ISSN: 2226-5147; 6 S.

A new research project in building acoustics has been started in Austria in 2014. The overall goal of ACA is to establish the required infrastructure and concentrate the competence of three institutions (HFA, TGM, TU Vienna) with different approaches to building acoustics. This cooperative project will lead to acoustic test facilities for lightweight components where attention is drawn to the research topics "low frequencies" and "subjective perception". Therefore, installation of two transmission suites is intended, taking into account experience of several leading European laboratories, current research results and ongoing worldwide discussion process on this topic. To get an idea about the optimal dimensions of the transmission suites to fulfill the conditions for reproducible building acoustic measurements in the extended frequency range below 100 Hz, a parametric study was carried out. The indicators of diffusivity of the sound field like eigenmode density, distribution and shapes where calculated by a FEM Model. The Model was validated through a comparison of the calculated and measured sound pressure field in the source- and receiving room of the test facility at TGM during a sound transmission loss measurement. This paper shows the comprehensive considerations which led to the design of two transmission suites for lightweight building components and describes the scientific approach within numerous opposing poles that have to be respected in the design process.