Table 1 Optimized radii of the rubber-lead rods.

From: Omnidirectional acoustic cloaking against airborne sound realized by a locally resonant sonic material

i

1

2

3

4

\(R_{\mathrm {out}}^{(i)}/R\)

0.19909

0.23752

0.16915

0.16365

\(R_{\mathrm {in}}^{(i)}/R\)

0.02452

0.09350

0.00797

0.00000

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