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This paper presents the acoustic design process of an acoustic shell for open-air Chamber Music concert, which we refer to as Resonant String Shell (ReS). Each and every part of the shell is made of timber and reversible joints with no glue, thus allowing a simple manufacturing, a sustainable process and a cost effective structure. A sophisticated...
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The full text is available herhttps://www.aes.org/tmpFiles/elib/20220820/21850.pdf .
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Citations
... Resonant String Shell (ReS) is an acoustic shell developed to improve the acoustic experience of concertgoers attending outdoor music performances [9] . From 2011, The ReS research group worked on three different topics: a. structural and technological design of the shell; b. development of computational tools for acoustic prediction and design; c. methods for acoustic measurements; addressing a specific objective for each of them: ...
Acoustic shells for outdoor concerts are a specific subclass of passive acoustic systems aimed to amplify and equally distribute sound over an audience area in outdoor conditions. The objective of this paper is to describe an automated design methodology that takes advantages of Computational Morphogenesis to generatively inform an efficient acoustic shape. Numerical predictions combine geometrical acoustic principles, descriptive geometry and Evolutionary Algorithms to explore a multivariate topology and achieve convergence to a series of viable and performing solutions. The case of Resonant String Shells-ReS-is used to show a sample workflow where acoustical, computational and construction problems are addressed under a unique, comprehensive and holistic investigation. The formulation of the problem is general and adaptable to different cases and objectives. The design targets a highly portable structure that results from the aggregation of very simple geometrical elements to support small orchestras over an open-air audience area of up to 400 people. Three acoustic objectives, measured on the audience area, are considered to deliver the project-the maximisation of the sound pressure level, minimisation of the deviation between sound pressure levels and minimization of the sound pressure level difference between different sources. Two technological objectives are pursued in the form of hard constraints of the generative process: the planarity of every reflective panel and adjacency between their edges to realize a watertight enclosed shell. The final, definitive solution is subject to detailed acoustic measurements.
... The design method that led to Soundforms ® , described by Bassuet et al. [2], which opened the way to a more accurate design for acoustic chambers. 2. The acoustic shell that provided the design basis of the artefact presented in this paper, ReS, explained by Di Rosario et al [4] and Pignatelli et al [11]. The design of such acoustic chamber is hereafter explained, from the morphogenesis to the construction of three among the four acoustic devices of ReS: the main shell, the cilia system, the array canopy. ...
... The structural concept was strictly related to the definition of a regular acoustic shell made by small elements, easy to manage and to be lift up. At the last step of the research, which leads to ReS 3.0, the morphogenetic approach has been introduced as a form-improvement tool, controlling just local orientations of the given panels -depicted by Pignatelli et al. [11]. For the current work, since the panels dimensions are not provided, the structural design and the specific problems of an unexpected shape can be faced only once the optimal solution is reached. ...
This paper presents a deterministic method to design acoustic chambers for outdoor performances, and emphasises the benefits of a computational morphogenetic approach to the problem. It represents the newest outcome of a research program, conducted by ReS-Team and sponsored by VPM, on the development of the acoustic chamber ReS. The research work is based on the interaction between two different topics – Computational Morphogenesis and Acoustics-which proceed on independent but parallel paths. As a computational tool for any Python ®-based environment, it aims to fill the gap between the architectural and acoustic design. By means of geometrical acoustics theory, descriptive geometry and genetic algorithms, the acoustic performance of a given topology is optimised according to defined acoustical parameters. The awareness of possible variations in the acoustic configuration is also increased. Applications are meant to predict the acoustic behaviour within any semi-reverberant field of an acoustic environment.
A one-day seminar on structures, algorithms and stone/timber prototypes was held on 11 January, 2016 at the Department of Civil Engineering and Architecture (DICAR) of the Politecnico di Bari. The event included an exhibition of student work, in the morning session, followed by a series of lectures by international academics.
ReS is a sustainable hand-built temporary acoustic shell, developed since 2011 and built during the architectural workshop at Villa Pennisi in Musica in Acireale, Sicily, every year since 2012. It is the product of a research program started at the Department of Architecture (Diarc) of the University of Naples Federico II, Italy, which involves a team of Italian experts in architectural design, product design, computational analysis and acoustics, together with the invaluable help from the soloists of the Santa Cecilia Orchestra of Rome. The design concept aims to provide a portable structure by reducing the on-site construction problems and the skills required by the builders, together with maximizing the acoustic performance for the audience and the musicians. The shell is built using only wood, mostly recycled. It can be built and dismantled by non-specialized workers, even students, in just 3 days, thanks to the use of mechanical reversible joints between the parts of the structure and to the lack of any kind of glue. A bespoke digital tool has been designed to calculate the optimal inclination of the reflecting panels for different orchestra configurations and music programs. An innovative construction technique has also been developed in order to improve the transition between these digital models and the fabrication phase. This paper describes the research process, which spans over 4 years now and presents the final results in form of acoustic simulations performed by acoustic modelling software and real world measurements.
