Vibroacoustic characteristics of light-weighted slabs – Part 1: Aspects of Numerical Modeling, Model Updating and Parametric Studies using the Buckingham Pi-Theorem

Nowadays a trend towards using wooden constructions in multi-story buildings for industrial and for residential use is recognized. This can be explained by reasons of profitability and by the necessity to develop sustainable engineering concepts. The serviceability linked with vibrations is a key issue for light-weighted structures especially for wooden slabs. In particular in a frequency range beneath 100Hz these structures are prone to pedestrian-induced vibrations, footfall noise and reradiated sound caused by induced vibrations. Measures to tackle these problems can consist in tuned-mass-dampers or adequate suspended ceilings respectively floating floors. In order to assess those systems complex models have to be built, which consider the sensibility of the structural vibration and the radiation behavior to the geometrical and material parameters. This contribution focuses on aspects for appropriate numerical models, such as support conditions, element types and contact phenomena, which usually are sources for numerical errors. Furthermore these models are calibrated with measured data using a model-updating algorithm based on the system’s eigenmodes. Parametric studies for different system geometries based on an updated model are presented using dimensionless parameters derived by the Buckingham Pi-Theorem. Nomograms of the results can give a prediction of the structures sound-radiation-characteristics for varying geometries.      «

Nowadays a trend towards using wooden constructions in multi-story buildings for industrial and for residential use is recognized. This can be explained by reasons of profitability and by the necessity to develop sustainable engineering concepts. The serviceability linked with vibrations is a key issue for light-weighted structures especially for wooden slabs. In particular in a frequency range beneath 100Hz these structures are prone to pedestrian-induced vibrations, footfall noise and reradia...     »