Hybrid prediction tool implemented for acoustic design studies of open plan office spaces

Artikel i vetenskaplig tidskrift, 2026

A hybrid room acoustics prediction tool using image sources and acoustic radiosity has been implemented. The theory and implementation are described including the specular reflection modelling in frequency domain using phased image sources, the diffuse reflection modelling using a downsampled time-domain acoustic radiosity approach, and how the models are combined with a successive transfer of energy from the image source model to the radiosity model. In particular, modelling of the shielding effect of screens is described in detail. The predicted results are compared with measured data, with and without shielding screens, showing reasonable agreement in the time-domain response as well as in the frequency-domain insertion loss of one screen. The results of a listening experiment show reasonably good agreement in perceived similarity between measurements and model predictions, both with and without a shielding screen, indicating the usefulness of the model.