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

Table 3

RMS and relative differences of displacement and acceleration response under stochastic 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	0.011	0.742	2.37 × 10^−3	−78.45	0.242	−67.39	1.67 × 10^−3	−84.82	0.074	−90.03
40	0.013	1.163	3.54 × 10^−3	−72.77	0.441	−62.08	2.04 × 10^−3	−84.31	0.126	−89.17
50	0.021	1.654	5.89 × 10^−3	−71.95	0.647	−60.88	3.35 × 10^−3	−84.05	0.187	−88.69