Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation
Rupestrian churches are spaces obtained from excavation of soft rocks that are frequently found in many Mediterranean countries. In the present paper the church dedicated to Saints Andrew and Procopius, located close to the city of Monopoli in Apulia (Italy) is studied. On-site acoustical measures w...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-04-01
|
| Series: | Acoustics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2624-599X/5/2/23 |
| _version_ | 1797596653124845568 |
|---|---|
| author | Francesco Martellotta Stefania Liuzzi Chiara Rubino |
| author_facet | Francesco Martellotta Stefania Liuzzi Chiara Rubino |
| author_sort | Francesco Martellotta |
| collection | DOAJ |
| description | Rupestrian churches are spaces obtained from excavation of soft rocks that are frequently found in many Mediterranean countries. In the present paper the church dedicated to Saints Andrew and Procopius, located close to the city of Monopoli in Apulia (Italy) is studied. On-site acoustical measures were made, obtaining a detailed description of the acoustics in the current state pointing out, thanks to a combination of analysis techniques, the presence of significant modal behavior in the low frequencies, causing reverberation time to be about 2 s, four times longer than in the other bands, as well as being strongly dependent on source and receiver position (with variations of about 1 s when source is moved outside the chancel). However, as the church is characterized by significant degradation of surfaces and large amounts of debris cover the floor, the original acoustic conditions can be expected to somewhat differ. Acoustical modelling can be very helpful in grasping the original conditions, but given the small dimensions of the space, conventional geometrical acoustic prediction methods cannot be applied to simulate the low-frequency behavior. Thus, the present paper proposes an application of finite-difference-time-domain (FDTD) computation to simulate the low-frequency behavior and analyze a possible reconstruction of the original state. Results showed that a very good agreement was obtained between predictions and measurements, both in terms of resonance frequencies and reverberation times that differed by less than 5%. Modal response strongly affected the acoustical conditions also in the hypothetical reconstruction of the original state, although the sound field proved to be more uniform than in the current state. |
| first_indexed | 2024-03-11T02:54:10Z |
| format | Article |
| id | doaj.art-ce76608db88d4cdaac076a314cd46890 |
| institution | Directory Open Access Journal |
| issn | 2624-599X |
| language | English |
| last_indexed | 2024-03-11T02:54:10Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Acoustics |
| spelling | doaj.art-ce76608db88d4cdaac076a314cd468902023-11-18T08:48:15ZengMDPI AGAcoustics2624-599X2023-04-015239641310.3390/acoustics5020023Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD SimulationFrancesco Martellotta0Stefania Liuzzi1Chiara Rubino2Dipartimento di Architettura, Costruzione e Design, Politecnico di Bari, 70125 Bari, ItalyDipartimento di Architettura, Costruzione e Design, Politecnico di Bari, 70125 Bari, ItalyDipartimento di Architettura, Costruzione e Design, Politecnico di Bari, 70125 Bari, ItalyRupestrian churches are spaces obtained from excavation of soft rocks that are frequently found in many Mediterranean countries. In the present paper the church dedicated to Saints Andrew and Procopius, located close to the city of Monopoli in Apulia (Italy) is studied. On-site acoustical measures were made, obtaining a detailed description of the acoustics in the current state pointing out, thanks to a combination of analysis techniques, the presence of significant modal behavior in the low frequencies, causing reverberation time to be about 2 s, four times longer than in the other bands, as well as being strongly dependent on source and receiver position (with variations of about 1 s when source is moved outside the chancel). However, as the church is characterized by significant degradation of surfaces and large amounts of debris cover the floor, the original acoustic conditions can be expected to somewhat differ. Acoustical modelling can be very helpful in grasping the original conditions, but given the small dimensions of the space, conventional geometrical acoustic prediction methods cannot be applied to simulate the low-frequency behavior. Thus, the present paper proposes an application of finite-difference-time-domain (FDTD) computation to simulate the low-frequency behavior and analyze a possible reconstruction of the original state. Results showed that a very good agreement was obtained between predictions and measurements, both in terms of resonance frequencies and reverberation times that differed by less than 5%. Modal response strongly affected the acoustical conditions also in the hypothetical reconstruction of the original state, although the sound field proved to be more uniform than in the current state.https://www.mdpi.com/2624-599X/5/2/23acousticsrupestrian churchacoustical simulationFDTD modellingheritage buildings |
| spellingShingle | Francesco Martellotta Stefania Liuzzi Chiara Rubino Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation Acoustics acoustics rupestrian church acoustical simulation FDTD modelling heritage buildings |
| title | Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation |
| title_full | Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation |
| title_fullStr | Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation |
| title_full_unstemmed | Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation |
| title_short | Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation |
| title_sort | reviving the low frequency response of a rupestrian church by means of fdtd simulation |
| topic | acoustics rupestrian church acoustical simulation FDTD modelling heritage buildings |
| url | https://www.mdpi.com/2624-599X/5/2/23 |
| work_keys_str_mv | AT francescomartellotta revivingthelowfrequencyresponseofarupestrianchurchbymeansoffdtdsimulation AT stefanialiuzzi revivingthelowfrequencyresponseofarupestrianchurchbymeansoffdtdsimulation AT chiararubino revivingthelowfrequencyresponseofarupestrianchurchbymeansoffdtdsimulation |