TY - CHAP A1 - Buchner, Stefan A1 - Wagner, Marcus A1 - Höller, Christoph T1 - Inverse Acoustic Characterization of Rigid Porous Media using Artificial Neural Networks T2 - Proceedings of DAS|DAGA 2025, 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen N2 - Porous sound absorbers can be described by the isotropic Biot model, and its fluid phase can be represented by the Champoux-Allard model. To apply these models to a given absorber material, the five acoustical and the four mechanical material parameters must be known. The direct measurement of these parameters is complex and requires cost-intensive measurement equipment. Current inverse methods to obtain these material parameters solve an optimization problem, trying to fit the absorption or impedance curve of the material model to the impedance tube measurement data. Solving this optimization problem, i.e. finding the global minimum, is not guaranteed in an acceptable amount of time, as the optimization problem possesses a multitude of local minima. This work proposes an alternative, data driven approach using artificial neural networks to obtain the material parameters necessary for the characterization of open porous materials. The approach only requires the results of standard impedance tube measurements. The characterization of rigid- and elastic frame materials has been investigated. The datasets were generated using the rigid and elastic frame models for porous absorbers. The approach shows good results for impedance curves generated by the analytical models, the validation with real-world impedance tube measurement data is currently under investigation. Y1 - 2025 SN - 978-3-939296-23-2 U6 - https://doi.org/10.71568/dasdaga2025.142 SP - 847 EP - 850 CY - Berlin ER - TY - RPRT A1 - Höller, Christoph A1 - Quirt, David A1 - Mahn, Jeffrey A1 - Müller-Trapet, Markus T1 - Guide to calculating airborne sound transmission in buildings N2 - In recent years, the science and engineering for controlling sound transmission in buildings have shifted from a focus on individual assemblies such as walls or floors, to a focus on performance of the complete system. Standardized procedures for calculating the overall transmission, combined with standardized measurements to characterize sub-assemblies, provide much better prediction of sound transmission between adjacent indoor spaces. The International Standards Organization (ISO) has published a calculation method, ISO 15712-1 that uses laboratory test data for sub-assemblies such as walls and floors as inputs for a detailed procedure to calculate the expected sound transmission between adjacent rooms in a building. This standard works very well for some types of construction, but to use it in a North American context one must overcome two obstacles – incompatibility with the ASTM standards used by our construction industry, and low accuracy of its predictions for lightweight wood or steel frame construction. To bypass limitations of ISO 15712-1, this Guide explains how to merge ASTM and ISO test data in the ISO calculation procedure, and provides recommendations for applying extended measurement and calculation procedures for specific common types of construction. This Guide was developed in a project established by the National Research Council of Canada to support the transition of construction industry practice to using apparent sound transmission class (ASTC) for sound control objectives in the National Building Code of Canada (NBCC). However, the potential range of application goes beyond the minimum requirements of the NBCC – the Guide also facilitates design to provide enhanced sound insulation, and should be generally applicable to construction in both Canada and the USA. This publication contains a limited set of examples for several types of construction, to provide an introduction and overview of the ASTC calculation procedure. Additional examples and measurement data can be found in the companion documents to this Guide, namely NRC Research Reports RR-333 to RR-337. Furthermore, the calculation procedure outlined and illustrated in this Guide is also used by the software web application soundPATHS, which is available for free on the website of the National Research Council of Canada (see the references in Section 7 of this Guide for access details). Au cours des dernières années, les scientifiques et les ingénieurs ont fait porter leurs efforts en matière d’atténuation de la transmission du son dans les bâtiments davantage sur le rendement du système dans sa totalité que sur les ensembles de construction individuels. Les méthodes normalisées de calcul de la transmission globale, combinées à des mesures normalisées de caractérisation des sous-ensembles, permettent de mieux prédire la transmission du son entre des espaces intérieurs adjacents. L’Organisation internationale de normalisation (ISO) a publié une méthode de calcul, la norme ISO 15712-1, qui utilise des données d’essai en laboratoire pour les sous-ensembles, comme les murs et les planchers, comme données d’entrée en vue d’une méthode détaillée de calcul de la transmission du son prévue entre des pièces adjacentes dans un bâtiment. Cette norme fonctionne très bien pour certains types de construction, mais pour l’utiliser dans un contexte nord-américain, il faut surmonter deux obstacles – l’incompatibilité avec les normes ASTM utilisées par notre industrie de la construction et la faible exactitude de ses prévisions pour la construction à ossature de bois ou d’acier légère. Pour contourner les limites de la norme ISO 15712-1, le présent guide explique comment fusionner les données d’essai de l’ISO et de l’ASTM dans la méthode de calcul de l’ISO, et formule des recommandations relativement à l’application de méthodes élargies de mesure et de calcul pour des types de construction courants. Le présent guide a été élaboré dans le cadre d’un projet mis sur pied par le Conseil national de recherches du Canada afin d’appuyer la transition de la pratique de l’industrie de la construction vers l’utilisation d’un indice de transmission du son apparent (ITSA) satisfaisant aux objectifs de réduction rigoureux du Code national du bâtiment du Canada (CNBC). Toutefois, l’éventail potentiel d’applications va au-delà des exigences minimales du CNBC – le Guide facilite aussi une conception visant à améliorer l’insonorisation et devrait s’appliquer de façon générale à la construction tant au Canada qu’aux États-Unis. La présente publication contient un ensemble limité d’exemples pour plusieurs types de construction, afin de fournir une introduction et un aperçu de la méthode de calcul de l’ITSA. On trouvera d’autres exemples et données de mesure dans les documents d’accompagnement du présent guide, à savoir, les rapports de recherche RR-333 à RR-337 du CNRC. De plus, la méthode de calcul décrite et illustrée dans le présent guide est également utilisée par l’application Web soundPATHS, disponible gratuitement sur le site Web du Conseil national de recherches du Canada (voir les références à la section 7 du présent guide pour les détails d’accès). KW - airborne sound KW - apparent sound transmission class KW - ASTC KW - building KW - building acoustics KW - CLT KW - concrete KW - cross-laminated timber KW - Delta STC KW - flanking KW - hybrid KW - impact noise KW - ISO 12354 KW - ISO 15712 KW - Kij KW - linings KW - masonry KW - National Building Code Canada KW - NBCC KW - precast KW - sound KW - sound transmission KW - sound transmission class KW - STC KW - steel-framed KW - structure-borne sound KW - timber KW - transmission KW - wood-framed KW - ΔSTC KW - ΔTL Y1 - 2019 U6 - https://doi.org/10.4224/40001814 PB - National Research Council of Canada. Construction ET - 5th edition ER - TY - RPRT A1 - Höller, Christoph A1 - Quirt, David A1 - Mueller-Trapet, Markus T1 - Apparent sound insulation in wood-framed buildings N2 - This Report presents the results from substantial experimental studies of sound transmission, together with an explanation of calculation procedures to predict the sound transmission between adjacent spaces in a building with wood-framed walls and floors. This Report presents two types of experimental data for wood-framed constructions: - Test data for direct sound transmission through typical wood-framed wall assemblies and wood-framed floor assemblies, plus a summary of trends for such constructions and references to compilations of additional data - Test data for flanking sound transmission measured following the procedures of ISO 10848 for coupled wall/floor junctions and wall/wall junctions Worked examples for calculating the apparent sound transmission class (ASTC) rating between adjacent dwelling units are presented to illustrate how the experimental data can be applied. Y1 - 2017 U6 - https://doi.org/10.4224/23002820 PB - National Research Council of Canada. Construction ER - TY - CHAP A1 - Höller, Christoph A1 - Zeitler, Berndt A1 - Reinhold, Steffi A1 - Jakob, A. A1 - Hopkins, C. T1 - Charakterisierung von Körperschallquellen auf der Empfangsplatte mit Hilfe von orthogonalen Funktionen T2 - Tagungsband - DAGA 2019 : 45. Jahrestagung für Akustik : 18.-21. März 2019, Rostock Y1 - 2019 UR - https://pub.dega-akustik.de/DAGA_2019/data/daga19_proceedings.pdf SN - 978-3-939296-14-0 SP - 93 EP - 96 PB - Deutsche Gesellschaft für Akustik e.V. CY - Berlin ER - TY - CHAP A1 - Höller, Christoph A1 - Quirt, David A1 - Zeitler, Berndt A1 - Sabourin, Ivan T1 - Apparent sound insulation in cold-formed steel-framed buildings T2 - 24th International Congress on Sound and Vibration (ICSV 24), 23-27 July 2017, London, UK Y1 - 2017 UR - https://www.iiav.org/icsv24/index.php?va=viewpage&vaid=366 PB - Curran Associates, Inc ER - TY - CHAP A1 - Höller, Christoph A1 - Zeitler, Berndt A1 - Schneider, M. A1 - Schanda, Ulrich T1 - Tieffrequenter Trittschall – Stand der Wissenschaft und Technik T2 - Fortschritte der Akustik - DAGA 2020 : 46. Deutsche Jahrestagung für Akustik Y1 - 2020 UR - https://www.dega-akustik.de/publikationen/online-proceedings PB - Deutsche Gesellschaft für Akustik e.V. ER -