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Investigation of five recital halls designed by Arup : uncertainty-based validation of reverberation time prediction models vs. measured performance

Chiara Ehrhardt

Investigation of five recital halls designed by Arup : uncertainty-based validation of reverberation time prediction models vs. measured performance.

Rel. Arianna Astolfi, Alessio Carullo, Helen Butcher , Luca Dellatorre, Ian Knowles. Politecnico di Torino, Corso di laurea magistrale in Architettura Costruzione Città, 2013

Abstract:

Prediction models and computer simulations have become indispensable tools for designing and Consulting in acoustics. The reliability of thè results obtained from these tools is dependent on different causes. Low frequencies, for example, proved to be less accurate both in thè spread sheet and computer models.

The main subject of this dissertation is to study five small music halls that Arup has completed in the last few years and to compare their measured performances at low frequencies with different prediction methods. This is owing to thè fact that at low frequencies all thè investigated concert halls show consistent differences between predicted and measured results. The aim of this dissertation is to determine whether this difference is a result of prediction errors or if it is a measurement error (lab/site). Considering thè uncertainties that come from thè analysis of all thè data collected during thè researches done in Arup, this thesis develops a statistical method, Monte Carlo, to estimate thè uncertainties that can provide possible reasons for thè different results obtained between predictions and measurements.

The concert halls that have been investigated are: Kings Place, Royal Welsh College of Music and Drama, Hoddinot Hall, Milton Court and Elisabeth Murdoch Hall.

The reverberation time parameter is thè parameter used to investigate and determine thè accuracy of prediction against thè measurements.

The prediction tools used for thè design of thè hall, which will be investigated below, are both spread sheets and Odeon® software version 12.

Room acoustics measurements of the Concert Halls were done using WinMLS®, running on a Dell® laptop.

Relatori: Arianna Astolfi, Alessio Carullo, Helen Butcher , Luca Dellatorre, Ian Knowles
Tipo di pubblicazione: A stampa
Soggetti: A Architettura > AO Progettazione
S Scienze e Scienze Applicate > SH Fisica tecnica
Corso di laurea: Corso di laurea magistrale in Architettura Costruzione Città
Classe di laurea: NON SPECIFICATO
Aziende collaboratrici: NON SPECIFICATO
URI: http://webthesis.biblio.polito.it/id/eprint/3389
Capitoli:

1. Introduction

2. How to develop thè design of a concert hall: strategies adopted by Arup over thè years

2.1. The ‘six requirements for an outstanding chamber music room’

2.1.1. A well-proportioned room

2.1.2. Appropriate room fìnishes

2.1.3. Sound diffusion

2.1.4. Absence of noise

2.1.5. Acoustic variability

2.1.6. Facilities

2.2. Acoustic Design Targets

3. The five concert halls

3.1. Kings Place, London

3.2. Royal Welsh College of Music and Drama, Cardiff

3.3. BBC Hoddinott Hall, Cardiff

3.4. Milton Court, London

3.5. Elisabeth Murdoch Hall, Melbourne

4. Reverberation Time: thè key index to evaluate thè acoustics of concert halls

4.1 How to predict and measure thè Reverberation Time

4.1.1 Spread sheet vs. Odeon Model

4.1.2 Room acoustics measurements by Arup

4.2 Prediction vs. measurement results of thè five concert halls

4.2.1 Kings Place

4.2.2 Royal Welsh College of Music and Drama

4.2.3 BBC Hoddinott Hall

4.2.4 Milton Court

4.2.5 Elisabeth Murdoch Hall

4.3 Final considerations about this first analysis

5. Evaluation of thè uncertainty using thè Monte Carlo method

5.1 Evaluation of uncertainty

5.1.1 Main stages of uncertainty evaluation

5.2 The Monte Carlo method

5.2.1 Propagation of distribution using thè Monte Carlo method

5.3 Evaluation of RT uncertainty of: Royal Welsh College of Music and Drama

5.3.1 Volume uncertainty 5.3.2Absorption coefficient uncertainty

5.3.2.I Tested materials 5.3.2.2Literature materials:

5.3.3 Recap of thè absorption areas inside thè investigated halls

5.4 Distribution functions for thè Monte Carlo

5.5 Distribution function tables of thè investigated concert halls 6 Results

6.1 Royal Welsh College of Music and Drama

6.2 Kings Place

6.3 Milton Court

7. Conclusions

APPENDIX A: pictures and drawings of thè five concert halls

APPENDIX B: volume measurement data

APPENDIX C: four models to evaluate thè absorption coefficient of thè resonant absorb thè resonant absorbers graphs obtained inside thè investigated halls.

8. Bibliography

Bibliografia:

1. Beranek, L.L. Concert Halls and Opera Houses: Music, Acoustics, and Architecture. New York : Springer-Verlag New York, INC., 1996.

2. Standard, British. BS EN IS03382-1: Acoustics - Measurement of room acoustic parameters. 2009.

3. Beranek, L.L. Music, Acoustics and Architecture. New York : John Wiley and Son, 1962.

4. D'Antonio, T.J. Cox and P. Acoustic Absorber and Diffusers. London-New York : Taylor and Francis, 2009.

5. Odeon Room Acoustics Software. Development of thè ODEON Room Acoustics Software, http://www.odeon.dk. [Online] Odeon Room Acoustics Software.

6. Kuttruff, H. Room Acoustics. 5th edition. London - New York : Spon Press, 2009

7. Everest, F. Alton. Master Handbook of Acoustics. 4th edition. New York : Me Graw-Hill, 2001.

8. Computer simulations in room acoustics: Concepts and uncertainties. Voraender, Michael. Aachen : s.n., 2012.

9. Simulations, measurements, and auralisations in architectural acoustics. J.H. Rindel, C. L. Christensen and G. Koutsouris. Lyngby, Denemark : s.n., November 2013.

10. Development, Morset Sound. WinMLS 2004; Reference Documentation. 2004.

11. Christensen, C. L. Odeon, a design tool for auditorium, noise control and loudspeaker system. Denemark : s.n.

12. Hidaka, Leo L. Beranek and Takayuki. Sound absorption in concert halls by seats, occupied and unoccupied, and by the hall's interior surfaces. JASA. 1998.

13. Spagnolo, R. Manuale di acustica. Torino : UTET Libreria SRL, 2001.

14. Price, M.J. Crocker and A.J. Noise and Noise control, vol.l. Boca Raton, Florida : CRC Press, 1979.

15. 101:2008, JCGM. Evaluation of measurement data — Supplement 1 to the "Guide to the expression of uncertainty in measurement" - Popagation of distributions using thè Monte Carlo method. 2008.

16. 100:2008, JCGM. Evaluation of measurement data — Guide to thè expression of uncertainty in measurement. 2008.

17. Maci, S. A methodology for thè determination of thè speech transmission index and its uncertainty. Master Thesis. September 2011.

18. Zio, M. Marseguerra and E. Basics of the Monte Carlo method with Application to system reliability. Hagen : LiLoLe- Verlag GmbH, 2002.

19. Standard, British. BS EN ISO 354:2003; Acoustics - Measurement of sound absorption in a reverberation room. 2003.

20. Limited, Sound Research Laboratories. Report number C/07/5L/20115/R01. Suffolk : s.n., 21 February 2008.

21. 9613-1, UNI ISO. Attenuazione sonora nella propagazione all'aperto. Calcolo dell'assorbimento atmosferico, settembre 2006.

22. ISO. ISO/FDIS 17497-1: Acoustics — Sound-scattering properties of surfaces'. Part 1: "Measurement of thè random-incidence scattering coefficient in a reverberation room". 2003.

23. Astolfi, A. Schede di acustica. Torino : Politeko, 2008.

24. Acoustics, Arup. Chamber music room: design development for acoustic excellence. May 2003.

25. The acoustic design of the Royal Welsh College of Music and Drama. 2011. Vol.33 part 2.

26. Stage D acoustic report, Hoddinott Hall Cbay. 2006.

27. Guildhall School of Music and Drama, stage C acoustic design. 2005.

28. Technical specifications Elisabeth Murdoch Hall. Melbourne : s.n.

29. Rindel, J.H. Improving acoustics from the concert hall to the office . s.l. : ISO Focus +, 2012.

30. Astolfi, A. L'acustica delle sale da spettacolo: progettazione preliminare. Torino : s.n
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