The evaluation of the developed sound absorber in the flow duct.

Abstract

In this paper, we show the results of measured sound absorption characteristic using the proposed acoustic metamaterial in the flow duct. The proposed acoustic metamaterial is based on the Helmholtz resonator with a flexible panel. The point of proposed sound absorber is that wide frequency range of highly sound absorption characteristic is achieved without using damping material. By the evaluation using the sound duct, the validity of this characteristic is indicated. And also, by the evaluation using the flow duct, we indicated this characteristic is sustained.