自動調整機能を有する空気ばねの最適調整方法

抄録

In this study, we propose an optimum tuning procedure for an air suspension with a variable length slit restriction. The developed isolation system includes tuning systems of an equivalent damping coefficient and an equilibrium position of a supported object. The variable length slit is formed by a grooved plate and a rotating flat plate faced to the grooved plate. The damping coefficient is almost proportional to an adjustment angle of the rotating flat plate. An optimum adjustment angle which provides the minimum resonance amplitude corresponding to a resonance frequency can be obtained by equation showing a relationship between the supported mass and the optimum adjustment angle. If the excited frequency is lower than the resonance frequency, the optimum adjustment angle is very large. On the other hand, if the excited frequency is higher than the resonance frequency, the optimum adjustment angle is very small. The micro-computer calculates the optimum adjustment angle corresponding to the excited frequency which is obtained from the vibration of a foundation and controls the servo motor to adjust the damping coefficient. The equivalent damping coefficient of the proposed air suspension does not depend on the amplitude even if the slit length is changed.