Modelling structure-borne sound transmission across a timber-frame wall using SEA

© 2016, German Acoustical Society (DEGA). All rights reserved. This paper concerns the modelling of sound transmission across a timber-frame wall under mechanical excitation by a point force using Statistical Energy Analysis (SEA). The aim is to develop and experimentally validate a model that would be relevant to machinery such as a heating device or a ventilation system that are often connected to such walls. The prediction is compared against measurements on a wall that forms part of a lightweight test-rig in the Laboratory for Sound Measurement (LaSM) at the University of Applied Sciences Rosenheim. A basic timber frame was built with a single layer of tongue and grooved chipboard on each side of the wall. With this configuration the structure represented a lightweight construction with horizontal junctions in addition to the vertical junctions that are more typical with lightweight constructions formed from plasterboard. A series of SEA models was developed with an increasing degree of complexity regarding the partitioning of the structure into subsystems. Additional experimental work was carried out to determine coupling loss factors across the chipboard joints which were then incorporated in the model. The SEA predictions show reasonable agreement with measured velocities on both leaves and sound pressure levels in the cavities.

[1]  Delphine Bard,et al.  Challenges for acoustic calculation models in "Silent Timber Build", Part 1- FEM , 2014 .

[2]  Trevor R.T. Nightingale,et al.  Vibration Response of Lightweight Wood Frame Building Elements , 1999 .

[3]  Valtteri Hongisto,et al.  Sound insulation of double panels : Comparison of existing prediction models. Commentary and Author's reply , 2006 .

[4]  U. Schanda,et al.  STRUCTURE-BORNE SOUND PROPAGATION ACROSS A DOUBLE LEAF TIMBER-FRAME WALL , 2015 .

[5]  Carl Hopkins.  Sound transmission across a separating and flanking cavity wall construction , 1997 .

[6]  Stefan Schoenwald.  Flanking sound transmission through lightweight framed double leaf walls : Prediction using statistical energy analysis , 2005 .

[7]  Catherine Guigou-Carter,et al.  Measurement Methods Adapted to Wood Frame Lightweight Constructions , 2006 .

[8]  Jonas Brunskog,et al.  Prediction model for the impact sound level of lightweight floors , 2003 .

[9]  Carl Hopkins.  Case study on the vibrational behaviour of a timber-frame structure , 2014 .

[10]  Catherine Guigou-Carter,et al.  Prediction Method Adapted to Wood Frame Lightweight Constructions , 2006 .

[11]  Robert J.M. Craik,et al.  Vibration transmission through a frame typical of timber-framed buildings , 2005 .

[12]  Carl Hopkins,et al.  Prediction of airborne sound transmission across a timber–concrete composite floor using Statistical Energy Analysis , 2016 .

[13]  Malcolm J. Crocker,et al.  Sound Transmission through Double Panels Using Statistical Energy Analysis , 1970 .

[14]  K. H. Heron,et al.  Resonant and non-resonant acoustic properties of elastic panels. I. The radiation problem , 1986, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[15]  Oliver Kornadt,et al.  Beschreibung Körperschallinduzierter Schalldruckpegel mit Hilfe von Übertragungsfunktionen , 2014 .

[16]  Robert J.M. Craik,et al.  Sound transmission through double leaf lightweight partitions part I: airborne sound , 2000 .