@article{SchoepferHopkinsMayretal.2016, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Entwicklung eines SEA-Modells f{\"u}r eine Holzrahmenbauwand mit N+F Beplankungslagen}, series = {DAGA 2016, 42. Deutsche Jahrestagung f{\"u}r Akustik, Aachen, Deutschland}, journal = {DAGA 2016, 42. Deutsche Jahrestagung f{\"u}r Akustik, Aachen, Deutschland}, year = {2016}, abstract = {Holzrahmenbaukonstruktionen stellen in Bezug auf ihre vibro-akustischen Eigenschaften komplexe Systeme dar. Eine Prognose des bei der K{\"o}rperschallanregung durch haustechnische Anlagen erzeugten Schalldruckpegels in angrenzenden R{\"a}umen ist b.d. nicht m{\"o}glich und bedarf entsprechender Modelle. In diesem Beitrag wird die Modellierung einer im Labor aufgebauten Holzrahmenbaukonstruktion unter Verwendung der Statistischen Energieanalyse (SEA) vorgestellt. Die Besonderheit der vorliegenden Konstruktion besteht in ihrem sehr einfachen Aufbau mit beidseitig einschaliger Beplankung durch Spanplatten mit Nut- und Federverbindung (N+F), sowie horizontalen und vertikalen Plattenst{\"o}ßen. In dieser Form weist die Konstruktion einen sehr inhomogenen Aufbau auf. Die Ergebnisse experimenteller Untersuchungen zeigten, dass an den N+F Verbindungen eine signifikante Abnahme der Schwingungsenergie vorliegt. Um diese Erkenntnisse im SEA-Modell zu ber{\"u}cksichtigen, wurden gemessene Kopplungsverluste f{\"u}r die Nut- und Federverbindung verwendet, wohingegen alle weiteren im System ben{\"o}tigten Verlustfaktoren aus Literaturwerten prognostiziert wurden. Ein Vergleich der Ergebnisse aus der SEA-Modellierung mit Messdaten der Schwingschnelle auf den Beplankungslagen sowie der Schalldruckpegel in den Wandhohlr{\"a}umen wird vorgestellt.}, language = {de} } @inproceedings{SchoepferHopkinsMayretal.2016, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Modelling structure-borne sound transmission across a timber-frame wall using SEA.}, series = {Proceedings of InterNoise 2016, Hamburg, Germany}, booktitle = {Proceedings of InterNoise 2016, Hamburg, Germany}, year = {2016}, abstract = {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 were 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 are compared with measured velocities on both leaves and sound pressure levels in the cavities.}, language = {en} } @inproceedings{SchoepferHopkinsMayretal.2015, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Measured transmission functions from structure-borne sound sources in a timber-frame construction}, series = {Proceedings of Euronoise 2015, Maastricht, Netherlands}, booktitle = {Proceedings of Euronoise 2015, Maastricht, Netherlands}, year = {2015}, abstract = {The aim of prEN 15657-2 is to provide engineering methods to estimate the structure-borne sound power input from machinery in situations where the source mobility matches or is lower than the receiver mobility. This situation often affects lightweight constructions such as timber-frame buildings. To estimate the sound pressure level in a room that is adjacent or distant from the room containing the source, the installed structure-borne sound power has to be propagated across at least one junction in the timber-frame construction. However, at present there are no generic, validated calculation models due to the complexity and the large variety of timber-frame constructions. A simplified approach to investigate and compare the structure-borne sound transmission is to treat the framed construction as a black box and only consider one parameter, a transmission function which is the ratio of the sound pressure level in the receiving room to the injected structure-borne sound power level. To get information about the variation of this transmission function in different timber-frame constructions, measurements were made in both the laboratory and the field. Experimental results are presented showing the variation due to different building configurations and the effect of the excitation position on the transmission function.}, language = {en} } @inproceedings{SchoepferHopkinsMayretal.2015, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Messungen der K{\"o}rperschallintensit{\"a}t in einer Holzrahmenbaustruktur}, series = {DAGA 2015, 41. Deutsche Jahrestagung f{\"u}r Akustik, N{\"u}rnberg, Deutschland.}, booktitle = {DAGA 2015, 41. Deutsche Jahrestagung f{\"u}r Akustik, N{\"u}rnberg, Deutschland.}, year = {2015}, abstract = {In den vergangenen Jahren hat der Holzbau auch im mehrgeschossigen Wohnungsbau an Bedeutung gewonnen. Zur Gew{\"a}hrleistung des Schallschutzes zwischen fremden Wohneinheiten sind Werkzeuge zur Berechnung der Schall{\"u}bertragung in leichten Baustrukturen, wie zum Beispiel Holzrahmenbaukonstruktionen n{\"o}tig. Solche Prognosemodelle m{\"u}ssen f{\"u}r Ingenieuranwendungen robust sein und auf abstrahierten, einfachen Rechenmodellen beruhen. Um die komplexen bertragungsmechanismen in solchen Rechenmodellen abbilden zu k{\"o}nnen, ist jedoch zun{\"a}chst eine detaillierte Kenntnis des Schwingungs- und K{\"o}rperschallverhaltens dieser Konstruktionen n{\"o}tig. In diesem Beitrag werden Ergebnisse von Untersuchungen an einer konkreten Rahmenbaukonstruktion vorgestellt. Hierzu wurde im Labor f{\"u}r Schallmesstechnik an der Hochschule Rosenheim ein Leichtbaupr{\"u}fstand errichtet. Grundlage f{\"u}r ein Prognosemodell k{\"o}nnten Berechnungsmethoden wie die Statistische Energieanalyse (SEA) darstellen. Um deren Anwendbarkeit zu pr{\"u}fen, wurde die Verteilung der K{\"o}rperschallenergie in einer Holzrahmenbauwand bei Anregung durch eine Punktquelle untersucht. Dabei wurde die Abnahme der Oberfl{\"a}chenschnelle mit steigendem Abstand zum Anregungspunkt sowie der Energiefluss in der Struktur mithilfe von K{\"o}rperschallintensit{\"a}ts-Messverfahren analysiert.}, language = {de} } @article{SchoepferHopkinsMayretal.2017, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Measurement of transmission functions in lightweight buildings for the prediction of structure-borne sound transmission from machinery}, series = {Acta Acustica united with Acustica}, volume = {2017}, journal = {Acta Acustica united with Acustica}, number = {103}, pages = {451 -- 464}, year = {2017}, language = {en} } @inproceedings{SchoepferHopkinsMayretal.2014, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Case study on the vibrational behavior of a timber-frame structure}, series = {European Acoustics Association (EAA) (ed.), Forum Acusticum, Krakow, Poland, 2014.}, booktitle = {European Acoustics Association (EAA) (ed.), Forum Acusticum, Krakow, Poland, 2014.}, year = {2014}, language = {en} } @inproceedings{SchoepferHopkinsMayretal.2015, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Structure-borne sound propagation across a double leaf timber-frame wall}, series = {22nd International Congress on Sound and Vibration, ICSV22, Florence, Italy, July 2015.}, booktitle = {22nd International Congress on Sound and Vibration, ICSV22, Florence, Italy, July 2015.}, year = {2015}, abstract = {With the increasing mechanization of buildings, it is necessary to be able to predict both the structure-borne sound power input from building machinery and the subsequent propagation of structure-borne sound in the building. This paper considers lightweight constructions and describes the results of an experimental study in the laboratory on a T-junction that was constructed from a timber joist floor and two double leaf timber-frame walls. The focus in this paper is on the vibrational behaviour of one of the timber-frame walls. To assess the vibration pattern and the propagation of structure-borne sound, the surface velocity levels were measured on a grid on both leaves of the wall with point force excitation on one side. This grid allowed calculation of structural intensity vectors. The influence of elements such as the timber studs and tongue and grooved joints between the boards were apparent in different frequency regions. Experimental modal analysis was carried out using measurements on both leaves of the wall, giving information about the coupling in different frequency regions. The results give insight into how such a timber-frame wall could be modelled using statistical energy analysis.}, language = {en} } @inproceedings{SchoepferHopkinsMayretal.2017, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Prediction of noise from machinery in timber-frame buildings using transmission functions}, series = {Proceedings of ICSV24}, booktitle = {Proceedings of ICSV24}, isbn = {978-1-906913-27-4}, year = {2017}, language = {en} } @inproceedings{SchoepferHopkinsMayretal.2017, author = {Sch{\"o}pfer, Fabian and Hopkins, Carl and Mayr, Andreas R. and Schanda, Ulrich}, title = {Ans{\"a}tze zur Prognose des Installationspegels im Holz-Leichtbau}, series = {Fortschritte der Akustik - DAGA}, booktitle = {Fortschritte der Akustik - DAGA}, organization = {Deutsche Gesellschaft f{\"u}r Akustik e.V.}, isbn = {978-3-939296-12-6}, year = {2017}, language = {de} } @inproceedings{MayrSchoepferSchandaetal.2018, author = {Mayr, Andreas R. and Sch{\"o}pfer, Fabian and Schanda, Ulrich and Hopkins, Carl}, title = {Measurement and prediction of structure-borne sound transmission from machinery in timber-frame buildings}, series = {Proceedings of Euronoise 2018}, booktitle = {Proceedings of Euronoise 2018}, year = {2018}, language = {en} }