iCity 1: AenoF_Facade Linings

Within the framework of the strategic partnership for the intelligent city i_city, novel concepts for sustainable, energy-efficient and resource-saving urban development are being developed, which, with increased use of information technology, ensure a higher degree of networking of energy systems, smart buildings and network infrastructure. In the field of action "Innovative building structures and technologies", investigations into the sound insulation of energy-optimised façade systems are being carried out in cooperation with the Bundesverband Kalksandstein e.V. (Federal Association of Sand-lime brick). Due to the already existing and further increasing noise pollution caused by road and rail traffic, high demands are placed on the sound insulation of energy-optimised facades when creating or refurbishing inner-city living space (redensification). Decentralised energy supply also creates new noise sources distributed in urban areas (e.g. heat pumps), often with increased noise radiation. At the same time, current, energy-optimized exterior wall constructions (for example, solid walls with thermal insulation composite systems) have considerable acoustic deficits. Despite known problems, almost no data is available for the acoustic planning process.

From the point of view of manufacturers and builders, a calculation model is needed to calculate the sound insulation of multi-shell facades, which also takes into account the coupling between the shells.

In the course of the research project, the effect of the complex interplay of masonry walls made of sand-lime brick and different solid linings on the sound insulation is determined by measurements and simulations. The airborne sound insulation, the loss factor, and the vibration characteristics of heavy-weight walls made of sand-lime brick without and with different solid linings are determined by vibration measurements and modal analysis.

The aim of the project is to develop a useful prediction method of airborne sound insulation by appropriately simplifying the complex vibrational system of the masonry walls with different lining and fastening variants. This prediction is to be incorporated, on the one hand, into the German sound insulation standards and on the other, into the "KS sound insulation".