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Keywords
- Lightweight floors (3)
- Building acustics (2)
- Finiten Elemente Methode (1)
- Holzdecken (1)
- Tapping Machine (1)
- Trittschallberechnung (1)
Institute
Die Optimierung der tieffrequenten Trittschalldämmung von Holzdecken kann durch Berechnungen mit der finiten
Elemente Methode (FEM) effektiv gestaltet werden.
Die mit der FEM berechneten Ei
genwerte und Eigenmoden des
Bauteils bilden hierbei die Basis, um
durch die Modalanalyse Rück
schlüsse für die Bauteiloptim
ierung ziehen zu können.
In diesem Beitrag wird die im Rahmen eines aktuellen Gemeinschaft
sprojektes mit dem ibp Stuttgart und dem ift
Rosenheim erfolgte Anwendung der FEM zur Berechnung der Trittschalldämmung im Überblick vorgestellt und auf die
Modellierung der Anregungskraft detaillierter eingegangen.
Up to now the research and developmen
t in the field of building acoustics is based mainly on measurements. The
consequence is that the development and optimization of a new building component is a very tedious and
expensive task. A considerably reduction of these costs could be achieved, if the optimization relying on
measurements would be replaced – at least to some extent – by a computational prediction model. Motivated by
these aspects a method is presented for using finite element techniques to estimate the impact sound level from
lightweight floors. The overall approach consists of the three-dimensional modeling of the structure and the
excitation source (tapping machine), the subsequent moda
l- and spectral analyses an
d the computation of the
radiated sound from the ceiling.
Optimization of lightweight floors in the low frequency range with a FEM based prediction model
(2009)
The impact noise transmission at low frequencies is a well
known problem of lightweight floors, which is treated in
many publications. A satisfying solution, considering the
different construction principles of lightweight floors,
could not be found so far. To overcome this problem a
FEM based prediction model for the optimization of the
floor construction and the improvement of the impact
sound insulation has been developed and applied in a
current research project at th
e TU München. The details of
the prediction model were published in [1]-[3]. This
contribution gives an overview of the prediction model
and shows the results of the computations and the
construction rules developed for optimized lightweight
floors.
Up to now the research and development in the field of building acoustics is based mainly on measurements. In consequence the development and optimization of a new building component is a very tedious and expensive task. A considerable reduction of these costs could be achieved, if the optimization relying on measurements would be replaced – at least to some extent – by a computational prediction model. For these models it is necessary to represent not only the component and the adjacent rooms but also the excitation in a suitable way. This paper gives an overview of models for the excitation generated by a standard tapping machine taking into account the interaction between the impacting steel cylinders of the tapping machine and the vibrating surface of the floor.