Bioinspired Low-Frequency Material Characterisation

Table 2

Material	Sound velocity (ms^−1)	Attenuation coefficients (Npm^−1Hz^−1)
		𝑎	𝑏
PP	2520 ± 20	(82 ± 3) × 10^−6	(−73 ± 7) × 10^−6
PVC	2320 ± 20	(30 ± 3) × 10^−6	(15 ± 7) × 10^−6
Brass	4560 ± 20	(6 ± 3) × 10^−6	(68 ± 7) × 10^−6