@inproceedings{TroebsSchandaVoeltl2013, author = {Tr{\"o}bs, H.-M. and Schanda, Ulrich and V{\"o}ltl, R.}, title = {Measurement of the radiation efficiency of suspended ceilings at low frequencies using swept sine excitation and high-frequency resolution}, series = {Internoise 2013}, booktitle = {Internoise 2013}, year = {2013}, abstract = {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.}, language = {en} } @inproceedings{SchandaTroebsVoeltletal.2013, author = {Schanda, Ulrich and Tr{\"o}bs, H.-M. and V{\"o}ltl, R. and Becker, P.}, title = {Semi-empirical model of the impact force of a walking person in the time domain and generated impact sound spectra}, series = {Internoise 2013}, booktitle = {Internoise 2013}, year = {2013}, language = {en} }