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Experimentally based statistical analysis of the vibrational energy of CLT building elements

  • The method is based on a simplified Statistical Energy Analysis(SEA) approach. The energy ratios of various subsystems are the main quantities to predict sound transmission. The method has proven to work sufficiently accurate for masonry and concrete buildings, where the building components like walls, floors etc. can be regarded as rather homogeneous structures. To adapt this method for solid timber constructions it is necessary to prove that basic SEA requirements are fullfilled by orthotropic materials and heterogeneous structures that occur in these building types. In a case study, an isolated T-junction formed by Cross Laminated Timber(CLT) elements is experimentally investigated. The buildings elements are subdivided in segments with typical screwed connections. In the experiments the diffusivity of the vibration field is investigated, using point excitation with a shaker at several positions and many, randomly chosen response positions. MONTE-CARLO simulations are conducted for random but fix-sized subsets of the measured response positions to find the necessary number of response positions for an accurate determination of the vibrational energy. As a result the distribution of the mean velocity levels can be approximated. In a second approach a multiple linear regression model based on the least absolute shrinkage and selection operator(LASSO)is applied, because for lower frequency bands multicollinearity is expected. In the context of linear regression modelling, data-driven methods are used to select optimal subsets of response positions, to get an estimating equation.

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Metadaten
Verfasserangaben:Simon Mecking, Markus Scheibengraber, Tobias Kruse, Ulrich Schanda, Ulrich Wellisch
Titel des übergeordneten Werkes (Englisch):24th International Congress on Sound and Vibration, ICSV24, London, United Kingdom, July 2017
Dokumentart:Artikel in einer Zeitung/Zeitschrift
Sprache:Englisch
Erscheinungsjahr:2017
Freies Schlagwort / Tag:Schallmesstechnik
CLT building
Fakultäten / Organisationseinheiten:Fakultät für Angewandte Natur- und Geisteswissenschaften
DDC-Klassifikation:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie