Meeting Room Acoustic Design in the Historical Building: The Example of Istanbul University Faculty of Science and Letters Building

Öz

In the restoration of historical buildings, the characteristics of the original period and the design decisions of the original period should be preserved. The rich interior volumes of historical buildings should not be reduced, the original ceiling height should not be changed and their original interior forms should be conserved. In addition, the requirements of current standards in the restoration of historical buildings should be met as much as possible. Providing auditory comfort conditions is also one of the important parameters in the restoration process. In this study, the meeting room in the historical building was analysed, the design decisions of the original period of the meeting room were preserved, and an acoustic improvement project was presented depending on the characteristics of the historical building. In the acoustic project proposal, the original room height, the richness of the interior volume, and the perception of the mirrored vault system were preserved to maintain original period design decisions. In the acoustic project proposal, auditory comfort conditions were improved by increasing the total absorption rate in the meeting room. Reverberation time analyses and delayed reflection analyses were performed. In addition, the homogeneous propagation of the sound in the space was examined by using the acoustic simulation program. With the acoustic project proposal, the reverberation time was controlled in line with the DIN18041 standard, the delayed reflections were greatly reduced, the homogeneous propagation of the sound in the space has been improved, and the intelligibility of speech in the meeting room has been increased.

Anahtar Kelimeler

• Conservation of the historical space
• Room acoustic design
• Reverberation time
• Speech intelligibility
• Auditory comfort conditions
• Acoustic problems

Kaynakça

1. Bozkurt T.S., (2022), Acoustic Improvement Proposal in Historical Building: The Example of The Main Lecture Hall at The Beyazıt Campus of Istanbul University, Gazi University Journal of Science Part B: Art Humanities Design and Planning, cilt.10, sa.1, ss.13-29, https://dergipark.org.tr/tr/pub/gujsb/issue/69238/1075978
2. Bozkurt, T.S., Demirkale, S.Y., (2019), Laboratory analyses and numerical simulation for sound absorption of plasters in historical buildings, Journal of Cultural Heritage, Volume 36, Pages 103-117, https://doi.org/10.1016/j.culher.2018.09.012
3. Bozkurt, T.S., Demirkale, S.Y., (2020) The experimental research of sound absorption in plasters produced with perlite aggregate and natural hydraulic lime binder, Acoust Aust 48, 375–393, https://doi.org/10.1007/s40857-020-00203-4
4. Bozkurt T. S., Sayın B., Karakas A. S., Akcay C., (2019), Retrofitting of Modern Heritage Masonary Infilled RC Buildings, 5th International Conference on Engineering and Natural Sciences, ICENS, June 12-16 2019, Prague, Czech Republic, Book of proceedings 2019, pp. 645-653, ISBN 978-605-81426-1-9, https://www.icens.eu/sites/default/files/2019_icens_proceedings_v5.pdf
5. Cox, T., D'Antonio, J.P., (2004), Acoustic Absorbers and Diffusers: Theory Design and Application, Spon Press; Taylor and Francis, ISBN 0-203-49299-4
6. Demirkale, S.Y., (2007), Çevre ve Yapı Akustiği, Birsen yayınevi, ISBN: 978-975-511-472-9
7. DIN Standard, DIN 18041:2016, Acoustic Quality in Rooms – Specification and Instructions for the Room Acoustic Design, Berlin, Germany, 2016
8. Everest, F., A. Pohlmann, K., C., (2009), Master Handbook of Acoustics, McGraw-Hill, Beşinci Baskı, ISBN: 978-0-07-160333-1

9. Günergun, F., Kadıoğlu S., İstanbul Üniversitesi’nin Yerleşim Tarihçesi Üzerine Notlar, Osmanlı Bilimi Araştırmaları VIII/1 (2006), https://dergipark.org.tr/tr/download/article-file/13256
10. Istanbul University Construction and Technical Department, meeting room design suggestion, Date: 2014
11. Jaramillo, A. M., Stell, C., (2015), Architectural Acoustics, Taylor & Francis Group, ISBN: 978-1-315-75284-6 (ebk)
12. Long, M., (2006), Architectural Acoustics, Elsevier, Academic Press, ISNB 13: 978-012-455551-8 and ISNB 10: 0-12-455551-9
13. Mehta, M., Johnson, J. and Rocaford J., (1999), Architectural Acoustics Principles and Design, Prentice Hall, ISBN: 0-13-793795-4
14. Maekawa, Z., Rindel, J.H., Lord, P., (2011), Environmental and Architectural Acoustics, Second edition, Spon Press, Taylor & Francis Group, ISBN13: 978-0-203-93135-6 (ebk)
15. Nocke, C., New standards in Architectural Acoustics - a German view, Proceedings of Acoustics 2016, 9-11 November 2016, Brisbane, Australia
16. Nocke, C., The new standard DIN 18041 – acoustic quality in rooms, Legislation and Regulations in Building Acoustics: Paper ICA2016-716, Legislation and Regulations in Building Acoustics: Paper ICA2016-716, 22nd International Congress on Acoustics, ICA 2016, Buenos Aires – 5 to 9 September, 2016
17. Republic of Turkey Ministry of Culture and Tourism, 4nd Istanbul Regional Board of Protection of Cultural Heritages, Decision no.107 of 05.06.2013
18. URL1 (2022), İstanbul Üniversitesi Fen ve Edebiyat Fakülteleri 1942-1947, Edhem Eldem Koleksiyonu, https://archives.saltresearch.org/handle/123456789/79585, Date of access: 12.09.2022
19. URL2 (2022), Decustic, Technical specifications acoustic panels, Acoustic panel with aligned holes, https://www.decustik.com/arxius/docs/FTP_PAP038_2015_uk.pdf, Date of access: 12.09.2022