Design and Research of Semiactive Quasi-Zero Stiffness Vibration Isolation System for Vehicles

Table 4

RMS and relative differences of vertical displacement and acceleration under semisinusoidal shock road.

Vehicle speed (km·h^−1)	Body centre			Passive QZS system				Semiactive QZS system
	Displacement (m)	Acceleration (m·s-2)	Displacement (m)	Displacement difference (%)	Acceleration (m·s^−2)	Acceleration difference (%)	Displacement (m)	Displacement difference (%)	Acceleration (m·s^−2)	Acceleration difference (%)
30	0.032	4.278	0.012	−62.50	1.267	−70.38	2.59 × 10^−3	−91.91	0.38	−91.12
40	0.057	6.096	0.023	−59.65	2.118	−65.26	5.65 × 10^−3	−90.09	0.579	−90.50
50	0.064	7.257	0.029	−54.69	2.626	−63.81	9.37 × 10^−3	−85.36	0.735	−89.87