Bioinspired Low-Frequency Material Characterisation

Table 3

Material	Sound velocity (ms^−1)	Attenuation coefficients (Npm^−1Hz^−1)
		𝑎	𝑏
PP	2510 ± 20	(81 ± 3) × 10^−6	(−64 ± 7) × 10^−6
PVC	2330 ± 20	(31 ± 3) × 10^−6	(10 ± 7) × 10^−6
Brass	4540 ± 20	(7 ± 3) × 10^−6	(41 ± 7) × 10^−6