Table 1 Geometrical parameters of the SFPA-optimized MSSC array consisting of 2 elements, including the predicted resonance frequencies (\({{Re}}\left({f}_{{res},{lossy},n}\right)\)) from Eq. (29) (Analytical) and FEM (Numerical)

From: Simultaneous acoustic perfect absorption and rainbow trapping via topologically optimized sub-wavelength multi-slit sonic crystal metamaterials

\(n\)

\({r}_{o,n}\,\left({mm}\right)\)

\({r}_{i,n}\,\left({mm}\right)\)

\({h}_{n}\,\left({mm}\right)\)

\({d}_{n}\,\left({mm}\right)\)

\({N}_{n}\)

\({\text{Re}}\left({f}_{{res},{lossy},n}\right)\,\left({Hz}\right)\,\left({Analytical}\right)\)

\({\text{Re}}\left({f}_{{res},{lossy},n}\right)\,\left({Hz}\right)\,\left({Numerical}\right)\)

1

32.8

30.5

2.3

0.4

3

540

544

2

35.0

29.1

5.9

0.9

2

458

466