Measurement and calculation of sound transmission across junctions of solid timber building elements
Regular paper
University of Applied Sciences Rosenheim
Monday 1 june, 2015, 12:00 - 12:20
Auditorium 2 (592)
Abstract:
The number of multi-storey buildings in timber construction increases
continuously. Compared to concrete and brick constructions the planning process
of sound insulation of a wooden building causes much higher effort. Reasons are
missing planning data and planning tools for sound insulation. Suitable,
computer-based tools, which enable a simulation already in an early planning
phase of a building, could help to reduce the planning effort significantly. One
possibility to calculate the in-situ airborne and impact sound insulation is to
combine the Finite Element Method (FEM) and the Statistical Energy Analysis
(SEA) in a coupled model, which consider the direct transmission path of the
building elements and the flanking transmission paths. The SEA-based calculation
of the sound insulation according to EN 12354 requires the vibration reduction
indices of the transfer paths at a junction of structural elements. This paper
shows actual measurement results of the Operational Vibration Analysis and the
vibration reduction indices of coupled Cross Laminated Timber elements. In the
process the elastic layers, the pressure and the fasteners were diversified. In
addition the modelling of the junction by using a commercial SEA tool will be
presented and the comparison of the calculated with the measured results. From
this comparison conclusion about the valid frequency domain for the Statistical
Energy Analysis will be presented. The results are based on the current status
of the research project 'Vibroakustik im Planungsprozess für Holzbauten' funded
by the German Research Foundation (DFG) and German Federation of Industrial
Research Associations (AIF). It is carried out by Technical University Munich,
ift Rosenheim and University of Applied Sciences Rosenheim.