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Primary sound absorption maxima and minima and their corresponding frequencies depending on the air gap size for the investigated ABS samples with Cartesian and Starlit structures.
| Structure Type | t (mm) | a (mm) | fmax1 (Hz) | αmax1 (−) | fmin1 (Hz) | αmin1 (−) |
|---|---|---|---|---|---|---|
| Cartesian | 30 | 0 | 2096 | 0.76 | 4184 | 0.25 |
| 10 | 1304 | 0.73 | 3000 | 0.23 | ||
| 50 | 656 | 0.63 | 1864 | 0.22 | ||
| 100 | 432 | 0.55 | 1136 | 0.17 | ||
| Starlit | 10 | 0 | 5328 | 0.81 | - | - |
| 10 | 2064 | 0.71 | 5912 | 0.15 | ||
| 50 | 904 | 0.55 | 2992 | 0.08 | ||
| 100 | 552 | 0.48 | 1312 | 0.09 |
