A acústica dos espaços urbanos em microescala: geometria e acurácia em modelos virtuais

Rafaella E. da Rocha; Stelamaris R. Bertoli

doi:10.55753/aev.v33e50.88

Authors

Rafaella E. da Rocha Universidade Estadual de Campinas, Campinas, SP
Stelamaris R. Bertoli Universidade Estadual de Campinas, Campinas, SP

DOI:

https://doi.org/10.55753/aev.v33e50.88

Keywords:

architectural details, noise mapping, methods, ray tracing, image source

Abstract

The International literature indicates different methods for microscale acoustic investigation in urban spaces. However, it is observed a lack of these investigations in Brazil. Some methods are based on computational application of geometric acoustic theory, commonly used in room acoustics simulations. However, some interfaces used in the simulation of sound propagation for microscale urban environments are different when compared to closed spaces, such as a concert hall. The purpose of this study is to identify which virtual acoustic model, with a detailed geometry or with a simplified one, better represent a real urban acoustic space. The accuracy of the model will be also investigated. A real microscale urban space, a square, was measured using the impulse response technique, and, virtually simulated using geometric acoustic software. Acoustic parameters T30, EDT and SPL were investigated. Results showed that the recommendations usually applied to closed rooms are not necessarily the same for open urban spaces. Even when it is applied typical compensations in reduced geometry models, such as the increase of scattering coefficients, the model with a more detailed geometry showed better accuracy and adherence to measured results, thus better representing the reality of the actual urban space.

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