Cambridge

Discussions on Acoustic Modelling

Date: 3 Sep 2015
Time: 18:30

Location: Anglia Ruskin University
Anglia Ruskin University East Road, CB1 1PT
Cambridge

This session will include 3 short papers on the topics of acoustic absorber design, the use of virtual acoustics for the study of medieval drama and the application of computer models to the study of cathedrals.

Holistic Acoustic Absorber Design: from modeling and simulation to laboratory testing and practical realization
Dr Rob Toulson (CoDE Research Institute, Anglia Ruskin University)
Dr Silvia Cirstea (VERU, Anglia Ruskin University)

Mathematical models for many acoustic absorption methods have previously been developed; however there is very little accessible data describing how those models perform in a practical implementation of the design. This paper describes the development of a novel slotted film sound absorber and presents the results at each design iteration. Initially a number of mathematical models are considered, in order to optimise the design. The modelled designs are laboratory tested with an impedance tube system, and finally, the practical acoustic absorber design is tested in an ISO accredited reverberation chamber. The results presented demonstrate that the simulation and impedance tube results match very closely, whereas the practical implementation performance is lower in terms of acoustic absorption.

Medieval Drama Acoustics
Dr Mariana Lopez (CoDE Research Institute, Anglia Ruskin University)

Research on pre-seventeenth century theatre acoustics has focused either on Greek and Roman or Elizabethan theatre, leaving aside the variety of performance venues used in medieval times. This paper focuses on research on the York Mystery Plays, a series of plays that were performed in the streets of York (UK) from the fourteenth to the sixteenth century. The application of impulse response measurements on site and the design of a multiplicity of computer models are analysed according to ISO 3382-1: 2009 parameters. A methodology for the study of medieval performance spaces is presented and results demonstrate that organisers of medieval plays were very likely aware of the impact of the staging configuration on acoustics, allowing them to make decisions that considered the aural dimension of the plays.

Acoustics of large places of worship: Spanish Cathedrals
Lidia Alvarez-Morales (PhD Candidate, University of Seville)

The last few years have seen an increase in the interest in the acoustic behaviour of heritage buildings and how such studies can increase our understanding of the cultural use of the space. This work describes the methodology used for studying the acoustic environment of the Catholic cathedrals of southern Spain, nowadays conceived as multifunctional enclosures. Sound propagation in these large reverberant spaces is assessed through the analysis of monaural and binaural impulse responses measured throughout the audience area considering sound source positions that correspond to the liturgical, musical, and cultural activities that take place in the temple nowadays. Furthermore, a 3D simulation model is created for each cathedral, which is used to assess the influence of occupancy and to evaluate different rehabilitation options and acoustic treatments.