Acoustics of icelandic lava caves

Małecki, Paweł; Lipecki, Tomasz; Czopek, Dorota; Piechowicz, Janusz; Wiciak, Jerzy

doi:10.1016/j.apacoust.2022.108929

Cited by 2 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some studies [8,9] seem to agree with these hypotheses, also suggesting a deliberate use of such effects in the underground galleries of Chavin de Huantar in Peru [8]. More recently the topic has been further investigated by several large interdisciplinary groups [10][11][12][13], and other studies of cave acoustics have been carried out involving natural caves mostly [14][15][16] or burial places like catacombs [17].…”

Section: Introductionmentioning

confidence: 85%

Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation

2023

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 85%

Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation

2023

View full text Add to dashboard Cite

show abstract

“…The research on dodecahedral source replacement focused on using impulse sources [17][18][19], but they do not offer complete control over the measurement signal. It was proved in previous research that impulse sources can replace electroacoustic sound sources, especially in places where the use of electric devices is limited, such as caves or catacombs [20][21][22]. The other alternatives studied [23,24] have significant limitations, such as the increased measurement length or the complication of measurement conduction.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Different Omnidirectional Sound Sources with the Validation of Coupled Speakers as a Measurement Source for Room Acoustics

Chojnacki,

Brzóska,

Fijałkowska

2023

Applied Sciences

View full text Add to dashboard Cite

Omnidirectional sources used in room acoustics usually take the form of multi-speaker sources. Few alternatives for the most commonly used dodecahedral sound source have been derived recently. The project aimed to measure room acoustic parameters using three different sound sources: a dodecahedron, a cube, and a new source of two coupled loudspeakers. The measurements were made by rotating the sources every 15 degrees. The differences in the EDT, T30, D50, and C80 parameters in the function of the rotation angle of the sources were analyzed. Statistical analysis was carried out to examine the sensitivity of the measured parameters’ JND (just a noticeable difference) on the source’s rotation angle. This presentation will show the results and analysis of measurements showing the influence of the used source on obtained parameters and the validation of coupled speakers’ use. A comprehensive discussion of the results obtained with different sources (coupled, dodecahedral, cubic) will be provided. The results confirmed using the coupled speakers as an alternative for omnidirectional sound source in the range of 250–2000 Hz.

show abstract

Acoustics of icelandic lava caves

Cited by 2 publications

References 9 publications

Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation

Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation

Comparison of Different Omnidirectional Sound Sources with the Validation of Coupled Speakers as a Measurement Source for Room Acoustics

Contact Info

Product

Resources

About