@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} } @article{SchoepferHopkinsMayretal.2017, author = {Sch{\"o}pfer, F. and Hopkins, C. and Mayr, A. and Schanda, Ulrich}, title = {Prediction of noise from machinery in timber-frame buildings using transmission functions}, series = {Proceedings of ICSV24}, journal = {Proceedings of ICSV24}, year = {2017}, abstract = {To ensure that building regulations are satisfied, the sound pressure level due to machinery has to be predicted at the design stage of a new building. With the increasing popularity of multistory timber dwellings, prediction becomes an important issue for designers and consultants. At present previous project experience is often used when considering the design of wall and floor constructions and the mounting positions for machinery. Simple tools to calculate the sound pressure levels in rooms based on machinery data and construction details are not currently available. The approach involves two stages: firstly the description of the source and secondly the prediction of vibration transmission across the building and sound radiation into the rooms. In this paper a simple empirical model is proposed for the second stage. This approach is based on measured transmission functions that are defined as the average sound pressure level in a receiving room relative to the injected structure-borne sound power. This is a logical extension of approaches to characterize structure-borne sound sources that also use a power based descriptor (e.g. prEN15657:2016-02: Acoustic properties of building elements and of buildings - Laboratory measurement of structure-borne sound from building service equipment for all installation conditions) and provides a simple method to estimate the sound pressure level in a room.}, language = {en} } @inproceedings{GottschalkPflaumSchneideretal.2017, author = {Gottschalk, L. and Pflaum, D. and Schneider, S. and Schulze, Achim and Becker, F. and Queck, M. and H{\"u}ttl, B.}, title = {Evaluation of a compehensive IV- Outdoor Characterization Method for Photovoltaik Modules}, series = {Proceedings of the 33rd EU-PVSEC}, booktitle = {Proceedings of the 33rd EU-PVSEC}, year = {2017}, language = {en} } @inproceedings{HummelKarlingerSchemme2017, author = {Hummel, Sabine and Karlinger, Peter and Schemme, Michael}, title = {Haftungsuntersuchungen f{\"u}r Leichtbauanwendungen}, series = {Technomer 2017}, booktitle = {Technomer 2017}, publisher = {Technische Universit{\"a}t Chemnitz}, address = {Chemnitz}, isbn = {978-3-939382-13-3}, pages = {1 -- 11}, year = {2017}, abstract = {Die Verst{\"a}rkung von Spritzgussteilen mit Faserhalbzeugen gewinnt immer mehr an Bedeutung. F{\"u}r die Einsatztauglichkeit derartiger Bauteile ist die Verbundhaftung zwischen den angespritzten Strukturen und den Faserhalbzeugen essentiell. Der Vortrag befasst sich mit den {\"a}ußeren und prozesstechnischen Einfl{\"u}ssen zu Erh{\"o}hung der Verbundhaftung auf Faserhalbzeugen. Zudem wird ein Einblick in die Pr{\"u}f und Anlagentechnik in diesem Bereich gegeben.}, language = {de} } @techreport{MeckingKruseWinteretal.2017, author = {Mecking, Simon and Kruse, Tobias and Winter, Christoph and Schanda, Ulrich}, title = {Vibroakustik im Planungsprozess f{\"u}r Holzbauten - Modellierung, numerische Simulation, Validierung, Teilprojekt 3: Parameterentwicklung und SEA-Modellierung, Schlussbericht}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4861}, year = {2017}, abstract = {Auf Basis empirischer Daten wurde die Diffusit{\"a}t des K{\"o}rperschallfeldes von Brettsperrholz-Bauteilen in realistischer Gr{\"o}ße beschrieben und Verteilungssch{\"a}tzungen in Abh{\"a}ngigkeit der verwendeten Antwortanzahl durchgef{\"u}hrt. Ein n{\"a}herungsweise diffuses K{\"o}rperschallfeld liegt im Beispiel nur in einigen Terzb{\"a}ndern im mittleren Frequenzbereich vor. Damit ist eine Energiebestimmung mit wenigen Antwortpositionen nur dort m{\"o}glich. Die Energiebestimmung {\"u}ber die Schnelle ist bei tiefen Frequenzen f{\"u}r einige Frequenzb{\"a}nder ohne Moden nicht geeignet, da hier die Voraussetzung nicht gegeben ist, dass die kinetische gleich der potenziellen Energie ist. Hochfrequent hat der Krafteinleitungsort bezogen auf die Elementst{\"o}ße Einfluss auf die Antwortstreuungen. Dar{\"u}ber hinaus ist bei tiefen wie auch bei sehr hohen Frequenzen eine hohe Antwortanzahl notwendig.}, language = {de} } @misc{MeckingScheibengraberKruseetal.2017, author = {Mecking, Simon and Scheibengraber, Markus and Kruse, Tobias and Schanda, Ulrich and Wellisch, Ulrich}, title = {Experimentally based statistical analysis of the vibrational energy of CLT building elements}, series = {24th International Congress on Sound and Vibration, ICSV24, London, United Kingdom, July 2017}, journal = {24th International Congress on Sound and Vibration, ICSV24, London, United Kingdom, July 2017}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4883}, year = {2017}, abstract = {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.}, language = {en} } @misc{TimpteMeckingSchandaetal.2017, author = {Timpte, A. and Mecking, S. and Schanda, Ulrich and Rabold, A.}, title = {Vibration reduction indices of CLT junctions}, series = {Proceedings of ICSV24}, journal = {Proceedings of ICSV24}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4982}, year = {2017}, abstract = {The multi-disciplinary research project "Vibroacoustic analysis in the planning process of timber constructions" carried out in cooperation between the University of Applied Sciences Rosenheim, the ift Rosenheim and the Technical University Munich is a comprehensive study of direct as well as flanking structure-borne and airborne sound insulation of Cross Laminated Timber (CLT) elements and their junctions. The aim is to optimize and simplify the acoustical planning process of wooden multi-storey buildings and thereby to contribute to the increase growth of timber construction industry in Europe. For a prediction of the acoustical performance of solid wood constructions, the vibration reduction index Kij is needed. The vibration reduction index can be determined i.a. of the direction-averaged junction velocity level difference and the structural reverberation time. Both quantities need to be measured according to EN ISO 10848. Alternatively, vibration reduction indices for a T- or cross-junction can be derived following the procedures described in prEN ISO 12354-1:2016. However, further knowledge and data of the sound transmission across junctions of CLT is inevitable for a reliable prediction. In this paper a collection of frequency dependent vibration reduction indices for CLT structures will be presented and compared, involving L-, T- and cross-junctions measured by six international laboratories.}, language = {en} } @misc{TimpteMeckingSchandaetal.2017, author = {Timpte, A. and Mecking, S. and Schanda, Ulrich and Rabold, A.}, title = {Stoßstellend{\"a}mm-Maße von Brettsperrholzkonstruktionen}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, journal = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4979}, year = {2017}, abstract = {Ein Ziel des DFG-AiF-Clusterforschungsvorhabens Vibroakustik im Planungsprozess f{\"u}r Holzbauten ist die Reduktion des schalltechnischen Planungsaufwandes bei der Massivholzbauweise. Hierzu soll das Prognoseverfahren der DIN EN 12354 zur Ermittlung der Flanken{\"u}bertragung f{\"u}r Holzbaukonstruktionen angepasst werden. Da es sich bei der Massivholzbauweise um keine starre Verbindungen wie beim Massivbau handelt, ist zur Berechnung der Flanken{\"u}bertragung ein Maß f{\"u}r die Schall{\"u}bertragung an den Stoßstellen erforderlich. Das sogenannte Stoßstellend{\"a}mm-Maß Kij wird u.a. aus der richtungsgemittelten Differenz der Schnellepegel je Bauteil und der K{\"o}rperschallnachhallzeit gebildet, welche nach der DIN EN ISO 10848 messtechnisch zu ermitteln sind. Alternativ wird im Entwurf E DIN EN 12354-1:2016 ein erster Vorschlag zur Berechnung des Stoßstellend{\"a}mm-Maßes f{\"u}r einen T- und einen Kreuz-Stoß in Brettsperrholz aufgef{\"u}hrt. In diesem Beitrag werden Stoßstellend{\"a}mm-Maße unterschiedlich ausgef{\"u}hrter Brettsperrholzkonstruktionen pr{\"a}sentiert und gegen{\"u}bergestellt. Es handelt sich um frequenzabh{\"a}ngige Werte, die von internationalen Laboren gem{\"a}ß DIN EN 10848 f{\"u}r L-, T- und Kreuz-St{\"o}ße ermittelt wurden.}, language = {de} }