Some aspects to improve sound insulation prediction models for lightweight elements
conference paper
The best approach to include lightweight building elements in prediction models for airborne and impact sound insulation between rooms, as in EN 12354, is not yet completely clear. Two aspects are at least of importance, i.e. to derive the sound reduction index R for lightweight elements for resonant vibrations only and the appropriate method to take into account the vibration reduction over junctions in case of highly damped, often also lightweight and multilayered, building elements. A comparison is made between proposals for correction of measured sound reduction indices. The results are quite comparable; the proposal by Gerretsen seems easier since it needs less input data. Based on calculations with a simple model for a junction between damped building elements, the possible approaches for the vibration transmission over junctions is studied. With the appropriate definitions and measurement approach, the vibration reduction index Kij shows to be applicable also in these cases, if it is realized that it contains both the effect of junction and element damping and each of these aspects can be adjusted separately. For the prediction of sound levels due to service equipment point excitation rather than random excitation is relevant and an adjustment for that application is also indicated. These results can be helpful in improving future versions of EN 12354.
Topics
Building elementEN 12354Impact sound insulationInput datasLightweight building elementsMulti-layeredPrediction modelRandom excitationsResonant vibrationsSound insulation predictionsSound levelSound reduction indexVibration reduction indicesVibration reductionsVibration transmissionBuilding componentsExhibitionsMathematical modelsAcoustic noise
TNO Identifier
471519
ISBN
9781605603858
Source title
36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007, 28-31 August, 2007, Istanbul, Turkey
Pages
2128-2137
Files
To receive the publication files, please send an e-mail request to TNO Repository.