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13.06 Performance Hall and Auditorium Acoustics

Big Acoustics in Small Spaces – Achieving HS Auditorium Design Goals with Space Constraints
Time: 11:40 am

Author: Robert Tanen

Abstract ID: 2058

When designing a high school auditorium there are several factors that determine the outcome of the final construction.  Prior to establishing acoustical design goals, the restrictions outlined from the design team typically start at budget and may extend to the size of the box in which the auditorium is to fit.  A fluent balance between design restrictions and internal acoustical goals is critical to create a successful end-product. This case study shows the actions taken to increase the volume, provide custom diffusion, and isolate an auditorium from mechanical sources directly above the space.  Furthermore, critical acoustical metrics such as loudness, spaciousness, ITDG, intimacy, reverberation time, clarity, etc., were analyzed in design and measured post construction.  Results, based on ISO 3382-1 testing are provided, as are the noise control measures implemented to achieve the established set of design criteria.  The overall intent of this case study presentation is to exhibit how goals across each design team discipline can be met, through sometimes unwilling compromise, ultimately producing a rewarding end-result for acousticians, architects, engineers, and ownership.

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Concert hall: acoustic design comparing analytical results and ray tracing
Time: 11:20 am

Author: Jose Carlos Giner

Abstract ID: 2445

With the intention of designing architecture for music and inspired by music, the J.C. Martins Concert Hall was created with 1008 seats and an approximate volume of 49400 ft³. Among all the architectural aspects considered, such as strategic location analyzed from the mass plan, study of volumetries, acoustics is the highlight due to its importance and complexity of the project. The Concert Hall is the object of the present study, the purpose of the article is to compare the simulated results in the EASE software with the analytical results of the reverberation time calculated by the Sabine and Eyering equations for the Concert Hall. Acoustic parameters such as reverberation time, clarity, among others, were simulated to verify the acoustic quality of the room in question. With that, it was possible to analyze and discuss the limitations of the analytical method and the simulations. Even so, the results were satisfactory to reach the adequated indexes of the acoustic parameters.

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Acoustical modelling of a Swedish 13th century church ruin, and its use for musical production.
Time: 11:00 am

Author: Sebastian Holm

Abstract ID: 1640

Visby is an old hanseatic town on the island of Gotland in Sweden. The town has a large number of old church ruins, one of which goes by the name of St. Lars. The church is believed to be a 13-century orthodox church, and abandoned in the 16 century, all that is left today are the stone walls and parts of the inner ceiling vaults. Through collaboration with the local museum, St.Lars has now been measured and 3D-modelled by the author, Sebastian Holm from Efterklang, who is also a part-time musician. The model has been fitted with what is assumed to be an historically accurate ceiling structure and materials as well as windows, doors, various furnishings and a make-up stage. With acoustical modelling and auralisations made in Odeon, various source and receiver positions has been tested for acoustical qualities, and the impulse responses are now used for musical production for the medieval band known as Patrask. The mixing process uses the impulse response from left and right side of the stage to produce a stereo reverb, and the results are compared to auralisations of the music made with Odeon. The overall process is discussed, with links to the music itself.

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Reuse of coffee and tea waste for acoustical panel applications in architectural design studios
Time: 12:00 pm

Author: Ece Sel

Abstract ID: 2515

This study has been initiated with an aim of enhancing the acoustical comfort levels in the architectural studios of Bilkent University in Ankara. Initial assessment of the studios by field tests indicated very long reverberation times, supporting the complaints by the students and instructors. In order to be applied in studio environment, acoustical panels are developed out of recycled materials. The increasing coffee demand and consumption of our era have motivated the reuse of both paper cups and coffee waste.  The end-product is composed of two layers. The outer layer is out of recycled coffee cups, placed in different arrangements in terms of orientation, size, and spacing. The backing layer is a panel of compressed and kiln-dried coffee grains and tea leaves. The coffee/tea residues are adhered together by using natural binders. In order to determine the best possible alternative of the waste materials with the highest sound absorption performance, different density variations have been explored. Both impedance tube tests and acoustical field measurements are utilized during the process of research and development. Considering the increasing demand for green technology, the layered panel system is proposing cost minimized, environmentally friendly, and biodegradable solutions with improved acoustical and aesthetical values.

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