Vibroacoustics in the planning process for timber constructions - modelling, numerical simulations, validation
In recent years, numerous investigations on the sound insulation of wood constructions have been carried out at Rosenheim University of Applied Sciences. The vibrations of modern wooden floors in particular have been examined in the frequencies below 100 Hz, which are the dominant frequencies for sound transmission in timber constructions. In the context of this research project, typical joints of modern timber constructions will be investigated by measurements and calculations. The measurement results will then be used to validate simulation models. The frequency range which is relevant for building acoustics will be calculated using two different, but complementary methods. Finite-Element-Method (FEM) models from the TUM (Technical University of Munich) will be used in the low-frequency range. For the middle and high frequencies, simulation models based on the Statistical-Energy-Analysis (SEA) will be developed at Rosenheim University of Applied Sciences. The results should allow the sound insulation of wood constructions to be predicted more reliably in an early planning phase. Moreover, the competitiveness of wood constructions as opposed to solid structures should be increased.
The aim of the project is a planning process that combines the numerical simulation and proof of the vibroacoustical building characteristics closely with the Building Information Model (BIM). This allows the expert to produce an optimized design of individual building components, the investigation of their vibrational coupling as well as the vibroacoustics of the entire building at an early stage of planning. A combination of the Statistical-Energy-Analysis (SEA) methods with an extension of existing Finite-Element-Methods in terms of a geometric-mechanical and vibroacoustical consistent coupling of building components, as well as the derivation of the geometry of the 3D model in BIM is sought after.
The challenge of the research at Rosenheim University of Applied Sciences lies in the calculation of structure-borne sound across junctions and the reduction of the variety of modern construction details to a few acoustically similar standardized constructions.