Abstract
Design charts of a sound absorbing wedge made of glass wool are proposed. They arecalculated using a computer simulation model developed for porous sound absorbing materials, such as glass wool. The model is confirmed experimentally using a precise measurement method of complex sound reflection coefficients of acoustic materials. Using the design charts an optimum wedge structure can be easily designed by specifying wedge parameters, that is, cutoff frequency, base width of the wedge and airflow resistivity of glass wool. Relation between airflow resistivity and volume density of a glass wool material which is conformed to Japanese Industrial Standard is also investi gatedfor designing a wedge using density instead of airflow resistivity.
