Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 10, 2017 - July 12, 2017
Perforated plates with backing cavity are effective for sound absorption and often used for noise control. In this study, we measured the sound absorption coefficient of perforated plates with inclined holes. Since the inclination of holes is not considered in the prediction by Guess, we compared the measured impedance with the prediction and then tried to correct the prediction to fit the measurement. The obtained profile of sound absorption coefficient of the plate with inclined holes has lower frequency of the peak and higher peak than that without inclination. We can revise the prediction considering the effective thickness of the plate when backing cavity is thick. (Backing cavity depth is up to 3.5mm) When the backing cavity depth is under 2.2mm, it is necessary to consider both the effective thickness and depth of backing cavity. We can revise using consider thickness of the plate and backing cavity depth frequency of peak of sound absorption coefficient.
