Slipper Bearing의 과도상태에서의 안정해석

This study concerns about stability analysis of slipper bearing in swash type piston pump that used in the EHA(electro hydrostatic actuator) system. The slipper bearing is a kind of hydraulic bearing that locates between swash plate and piston shoe. This hydraulic bearing needs high supply pressure and speed of pump’s rotation to be activated under the stable condition. The EHA system is some power pack that combines bidirectional pump and motor with hydraulic actuator to drive the actuator with motor’s speed and direction. In this system, a hydraulic pump is driven under the low supply pressure and speed of pump’s rotation because the actuator is controlled by pump’s flow. In this study, the author tries to find the stability criterion using Lyapunov function. For this purpose, the motion equation of piston was quoted from reference and the state equation was delivered. After that the Lyapunov function was defined to find the stable condition on equilibrium point.