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frequencies used a Helmholtz sound absorber to demonstrate sound absorption utilizing recycled paper (Hirata, et al., 2003). Moreover, we apply plant structures with minute clearances as sound-absorbing materials (Sakamoto, et al., 2011). This study aims to establish the sound absorption coefficient in sound-absorbing structures formed by bundles of clearances between two surfaces. In previous studies (Sakamoto, et al., 2014) (Sakamoto, et al., 2013), the authors performed and reported the results of experiments and theoretical analysis involving sound-absorbing structures having

journal of advanced mechanical design, systems and manufacturing

Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of &lt;i&gt;Sensu&lt;/i&gt; (folding fan) shaped test samples)