This study investigates the dynamic characteristics of a two-degree-of-freedom vibration isolation system that allows vertical translation and rotational motion. The isolator consists of two pairs of air suspensions with slit restrictions and reservoir tanks. The system's performance changes a lot when the center of gravity of the mass and the center of the air suspension pair are not aligned. The study gives guides for changing the equivalent damping ratio to account for eccentric setups. There exists a damping ratio that minimizes the resonance amplitude regardless of the eccentricity. However, since the direct calculation of this damping ratio is not straightforward, the resonance amplitude can be easily minimized by determining the damping ratio based on the frequency at which the frequency response curves under extremely high and low damping conditions intersect.
SUEDA et al. (Wed,) studied this question.