24th International Congress on Sound and Vibration ICSV, July 23-27, 2017, London, UK
radiation efficiency; plasterboard wall
The radiation efficiency of different plasterboard walls was determined through measurements in the direct sound transmission facilities at the University of Applied Science in Stuttgart. The radiation efficiency was determined using airborne sound excitation in the source room. The velocity on the plasterboard on the receiving room side was measured using accelerometers and the radiated sound power was calculated from the sound pressure level in the diffuse receiving room. In this study it was identified that the radiation efficiency of identical boards depends strongly on the construction of the wall (shaft wall, single stud wall, double stud wall) and in the low frequency range also on the mass-spring-mass resonance frequency of the double walls. The typical shape of the radiation factor, going from high to low frequencies, shows a decrease below the critical frequency of the plasterboard (at approx. 3 kHz) down to approx.-15 dB in the frequency range from 1250 Hz to 250 Hz. Below 250 Hz the radiation factor increases again, almost up to 0 dB in the frequency region close to the resonance frequency of the mass-spring-mass resonance. Why there is this increase of the radiation efficiency at low frequencies is explained through calculations that are related to the stiffness of the complete construction.
International Congress on Sound and Vibration
Proceedings of the 24th International Congress on Sound and Vibration.
Proceedings of the ... International Congress on Sound and Vibration.