LAUSR

Noise prediction and room acoustic design rely on simulation methods to model sound propagation. The sound particle simulation method (SPSM), among others, is an increasingly popular choice to do so. In recent years, the combination with the uncertainty based diffraction (UBD), where particles are deflected according to edge bypass distances measured in wavelengths, has helped to overcome typical high frequency limitations. To evaluate SPSM with UBD, 3D simulations are compared to measurements in full scale. As previous attempts to evaluate in real rooms suffered from difficulties to acquire accurate material coefficients, measurements are conducted in a controlled environment. A semi-anechoic chamber allows to examine free-field conditions as well as combinations with floor and wall reflections. This paper focuses on diffraction measurements around one or multiple screens of finite size. This allows the examination of higher order diffraction in combination with reflections. Impulse responses are measure...