Conference Agenda

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Session Overview
Session
Poster introductions 08: Acoustics
Time:
Wednesday, 25/Aug/2021:
11:40am - 12:00pm

Session Chair: Prof. Ryozo Ooka, The University Of Tokyo
Location: Room 5 - Room 019, Building: 116

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Presentations
11:40am - 11:43am

An OpenBIM workflow to support collaboration between Acoustic Engineers and Architects

Tim Pat McGinley1, Thomas Vestergaard2, Cheol-Ho Jeong3, Finnur Kári Pind Jörgensson3

1DTU Byg, Denmark; 2Sweco, Denmark; 3DTU Electro, Denmark

Architects require the insight of acoustic engineers in order to understand how to improve and or optimize the acoustic performance of their buildings. Normally this is supported by the architect providing digital models of the design to the acoustic engineer for analysis in the acoustician’s disciplinary software, for instance Odeon. The challenge with this approach is that these generic design models are often overloaded with geometric information that unnecessarily complicates the analysis process. This is a double frustration because the architect has to spend time adding this unnecessary information and the acoustician has to waste time removing it, meaning that by the time their guidance is offered to the architect, many potential opportunities and alternative design and material strategies that could improve acoustic performance are lost. Furthermore, the need for remodeling the geometry also applies a considerable extra cost to the acoustician’s service, which is a considerable deterrent with regard to involving the acoustician as early in the process as possible. OpenBIM workflows provide opportunities to increase the standardization of processes and interfaces between disciplines by reducing the reliance on the good nature of proprietary software solution providers to support interoperability. This paper therefore follows a design science research methodology to identify an OpenBIM workflow to enable the acoustic engineer to provide real time feedback on the acoustic performance of the architectural design. It is important that these new workflows are also considered to offer a transition from the old workflows. This is made possible by the use of the IFC format, which can then be read in the OpenBIM IfcOpenShell library. In this approach, a novel method of acoustic raytracing based on bounding box representations of the model is presented. The workflow is evaluated here and a method to further standardize this approach into a ‘microservice’ is presented.



11:43am - 11:46am

The e-SAFE energy and seismic renovation solutions for the European building stock: main features and requirements

Gianpiero Evola1, Giuseppe Margani2, Vincenzo Costanzo2, Carola Tardo2, Edoardo Michele Marino2, Giovanni Semprini3, Roberto Tomasi4, Christian Halmdienst5, Bart Voortman6

1Università degli Studi di Catania, Italy - DIEEI; 2Università degli Studi di Catania, Italy - DICAR; 3Alma Mater Studiorum - Università di Bologna; 4Department of Civil Engineering, Norwegian University of Life Sciences (NMBU); 5PINK GmbH; 6WEBO

In the framework of the ongoing four-year EU-funded innovation project called e-SAFE (energy and Seismic Affordable rEnovation solutions), several solutions for the energy and seismic deep renovation of reinforced concrete (RC) framed buildings in the EU countries are going to be developed, certified and demonstrated. These solutions address both the building envelope and the technical systems, and aim to be modular, customizable and sustainable in order to boost the decarbonisation of the largely inefficient building stock.

In particular, e-SAFE will couple modular timber-based energy renovation panels (e-PANEL) to a structural system that increases seismic performance according to two main solutions: i) the application of cross laminated timber (CLT) panels to the outer walls by connecting them to the existing RC frame through specifically designed dampers according to the specific seismicity level, ii) the use of a metallic exoskeleton made of bi-dimensional bracings equipped with dampers and connected to the existing RC-framed structure.

Moreover, e-SAFE will deal with energy systems in several ways, and in particular by using slim modular plug-and-play tanks to store thermal energy (e-TANK) provided by a reversible air-to-water heat pump. Thermal energy storage allows decoupling energy production and demand, while also shaving the peaks in the energy demand for heating and cooling.

This paper presents the main functional and technical requirements needed to ensure effectiveness, durability and sustainability to the e-SAFE renovation solutions, based on EU legislation and standards, as well as on good design practice. The outcomes will lay the foundations for the successive design and implementation stage, but will be also useful to define a design protocol for the proposed solutions.



11:46am - 11:49am

Binaural Speech Intelligibility in a real elementary classroom.

Greta Minelli1, Giuseppina Puglisi1, Arianna Astolfi1, Christopher Haut2, Anna Warzybok2

1Politecnico di Torino, Italy; 2Carl von Ossietzky Universität Oldenburg

Since in elementary classrooms the fundamental phases of the learning process take place, it is necessary to guarantee a proper acoustic environment for the listening activity to children immersed in them. In this framework, speech intelligibility, that is a quantification of the proportion of speech information that is both audible and usable for a listener, is especially important because information is transferred via speech.

In order to better understand and objectively quantify the effect of background noise and reverberation on speech intelligibility various models have been developed. Here, a binaural speech intelligibility model (BSIM) is investigated for speech intelligibility predictions in a real classroom considering the effect of talker-to-listener distance and binaural unmasking due to the spatial separation of noise and speech source. BSIM predictions are compared to the well-established room acoustic measures as reverberation time (RT), clarity or speech transmission index. Objective acoustical measurements were carried out in one italian primary school classroom before (reverberation time RT= 1.52 s±0.03 s) and after (RT= 0.45±0.02 s) the acoustical treatment. Speech reception thresholds (SRTs) corresponding to signal-to-noise ratio yielding 80% of speech intelligibility will be obtained through the BSIM simulations using the measured binaural room impulse responses (BRIRs). A focus on the effect of different speech and noise source spatial positions on the SRT values will aim to show the importance of a model able to deal with the binaural aspects of the auditory system. In particular, it will be observed how the position of the noise source influences speech intelligibility when the target speech source lies always in the same position.



 
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