Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Vibrations in lightweight structures - Efficiency and reduction of numerical models
Multi-storey wood buildings have been increasing in popularity since a century-old ban on the construction of such buildings was lifted in 1994. Compared to conventional concrete structures, it is more difficult to build lightweight structures in such a way that noise and disturbing vibrations is avoided. To design buildings of high performance regarding sound and vibrations, it is desirable to have tools for predicting the effects of structural modifications prior to construction. The long-term aim of the studies presented in the dissertation is to develop such tools by means of numerical models. Accurately assessing the dynamic behaviour of multi-storey wood buildings requires use of models representing the geometry in considerable detail, resulting in very large models which easily exceed the limits of computer capacity, at least for computations to be performed within reasonable time. It is therefore desirable to avoid unnecessarily detailed models, while at the same time describing the phenomena of interest accurately. Moreover, the computational efficiency of the models can be improved by employing model order reduction, reducing the size and computational cost of the models without affecting the accuracy appreciably. A common way of employing model order reduction is through substructure modelling, in which full finite element models are divided into smaller parts, or substructures, that are reduced in size and assembled to form reduced global models. The dissertation includes an investigation into the effect of modelling acoustic media inside cavities of multi-storey wood buildings on the transmission of structural vibrations. Air and insulation inside cavities were modelled as acoustic media in different ways and the resulting finite element models were compared. It was concluded that the acoustic media in cavities close to the source of vibration affect the vibration transmission and that it, therefore, has to be included in the models to some extent. Furthermore, the efficiency of different methods ...
Vibrations in lightweight structures - Efficiency and reduction of numerical models
Multi-storey wood buildings have been increasing in popularity since a century-old ban on the construction of such buildings was lifted in 1994. Compared to conventional concrete structures, it is more difficult to build lightweight structures in such a way that noise and disturbing vibrations is avoided. To design buildings of high performance regarding sound and vibrations, it is desirable to have tools for predicting the effects of structural modifications prior to construction. The long-term aim of the studies presented in the dissertation is to develop such tools by means of numerical models. Accurately assessing the dynamic behaviour of multi-storey wood buildings requires use of models representing the geometry in considerable detail, resulting in very large models which easily exceed the limits of computer capacity, at least for computations to be performed within reasonable time. It is therefore desirable to avoid unnecessarily detailed models, while at the same time describing the phenomena of interest accurately. Moreover, the computational efficiency of the models can be improved by employing model order reduction, reducing the size and computational cost of the models without affecting the accuracy appreciably. A common way of employing model order reduction is through substructure modelling, in which full finite element models are divided into smaller parts, or substructures, that are reduced in size and assembled to form reduced global models. The dissertation includes an investigation into the effect of modelling acoustic media inside cavities of multi-storey wood buildings on the transmission of structural vibrations. Air and insulation inside cavities were modelled as acoustic media in different ways and the resulting finite element models were compared. It was concluded that the acoustic media in cavities close to the source of vibration affect the vibration transmission and that it, therefore, has to be included in the models to some extent. Furthermore, the efficiency of different methods ...
Vibrations in lightweight structures - Efficiency and reduction of numerical models
Flodén, Ola (Autor:in)
01.02.2014
TVSM-3000; (TVSM-3073) (2014) ; ISSN: 0281-6679
Hochschulschrift
Elektronische Ressource
Englisch
Numerical modelling of lightweight structures
| British Library Conference Proceedings | 2002
| British Library Conference Proceedings | 2000
Taylor & Francis Verlag | 1992