A method for measuring oblique incidence absorption coefficient of absorptive panels by stretched pulse technique

摘要

This paper proposes a pulse method for estimating the acoustical performance of absorp- tive panels to reduce noise reflections when applied to road structures such as parallel walls and ceilings of double deck viaducts. The acoustical performance is specified on the basis of oblique incidence absorption coefficient. It is determined from the ratio of the reflected sound energy from the surface of a test panel to that reflected from a rigid floor.