“…One of the fundamental control strategies is to provide feedback regarding the absolute velocity of the isolation table, which is often referred to as skyhook damping (Fuller et al, 1996). State feedback (Miyazaki et al, 1994), feedforward (Mohamed et al, 2005) and active acceleration control (Zhu et al, 2006) have also been applied. Meanwhile, most active vibration isolation systems use high-performance sensors, such as servo-type accelerometers, to detect the vibration of an isolation table with high sensitivity in a low-frequency domain.…”