Table 3.

The maximum level of stress of the piezoelectric sensor under different impacts.

h/m	$\mathit{\sigma }$/MPa
	S-1 (Z)		S-2 (Y)		S-3 (X)
	Test	Simulation	Test	Simulation	Test	Simulation
1.0	40.72	48.01	6.01	9.86	7.22	7.65
1.5	49.21	56.26	8.02	11.09	8.52	8.77
2.0	50.29	46.66	8.23	10.83	9.75	9.52
2.5	49.23	45.15	10.12	9.31	10.02	10.50
3.0	51.36	44.06	8.96	9.92	10.95	10.75
3.5	49.36	47.83	11.25	11.37	9.53	12.82
4.0	42.67	48.18	10.63	11.02	14.23	13.90