Environmental noise emission from a variety of sources affects the surrounding community by causing discomfort and irritation. Current acoustic absorbers are able to be tuned to effectively absorb a selected range of frequencies. However, acoustic absorbers which are designed to absorb low frequencies usually require a large volume of space. It was desired to find small and compact acoustic absorbers capable of attenuating low frequency sound in the range of 100-1500 Hz. Some recent research has shown that reeds, a natural biomaterial, have significant acoustic absorption below 1000 Hz while taking up little space. This phenomenon is not well understood and has led to new interests in developing test campaigns and models to predict its absorptive behavior. This paper investigates the effect of orientation, fill, and reed diameter on low frequency acoustic absorption. Several fixed synthetic reed test samples were designed, additively manufactured, and tested to determine its acoustic absorption coefficient in a normal incidence impedance tube.
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