Figure 4
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(a) Absorption coefficient and (b) impedance as a function of the normalized frequency when one (mono-articulated beam, in magenta) or two (bi-articulated beam, in blue) modes are considered. For the first mode, the parameters are the same that in Figure 2. The second mode is defined by ωb2 = 6.05 ωb, kb2eb2 = kbeb/8 and δ2 = 2.5δ.
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