TY - JOUR A1 - Schanda, Ulrich A1 - Konle, E. T1 - Vertraulichkeit und ungestörtes Arbeiten mit Raum-in-Raum-Systemen in offenen Bürolandschaften JF - Deutsche Gesellschaft für Akustik e.V. (ed.), Fortschritte der Akustik - DAGA KW - Schallmesstechnik KW - Bürogestaltung Y1 - 2018 ER - TY - JOUR A1 - Hopkins, C. A1 - Filippoupolitis, M A1 - Ferreira, N. A1 - Völtl, R. A1 - Schanda, Ulrich A1 - Mahn, J. A1 - Krajci, L. T1 - Vibroacoustic finite element modelling of the low-frequency performance of a solid timber floor formed from dowel-connected joists JF - Proceedings of Inter-Noise 2016 N2 - This paper investigates the prediction of low-frequency impact sound insulation for a solid timber floor formed from dowel-connected joists with Swiss hardwood. A finite element model was developed for the dynamic response of the floor as it is neither homogeneous nor isotropic and has complex connections. With point force excitation, a FEM model for the dynamic response of the floor was validated using experimental modal analysis in the laboratory. Two different FEM models were developed, one using spring connectors and the other using join connectors. Good agreement between FEM and measurements in terms of the Modal Assurance Criterion (MAC) and eigenfrequencies was achieved for the first 14 modes with the spring connector model and for the first 7 modes with the join connector model. However, for the vibroacoustic analysis it was necessary to use the join connector model due to the computational instabilities of the spring model above 100 Hz when it was coupled to the acoustic medium. With mechanical excitation the radiated sound power from the underside of the timber floor was measured with sound intensity in order to calculate the radiation efficiency. Comparison of measurements and FEM showed reasonable agreement between 20Hz and 200Hz KW - Schallmesstechnik KW - Holzbau Y1 - 2016 ER - TY - JOUR A1 - Schöpfer, Fabian A1 - Mayr, Andreas R. A1 - Schanda, Ulrich T1 - Übertragungsfunktionen im Holzbau JF - Deutsche Gesellschaft für Akustik e.V. (ed.): Fortschritte der Akustik - DAGA 2018, 44. Deutsche Jahrestagung für Akustik, München, Deutschland KW - Schallmesstechnik KW - Übertragungsfunktionen im Holzbau Y1 - 2018 ER -