Optimum design of recess parameters for a high-speed hybrid journal bearing using fluid-structure interaction and improved orthogonal experiment method

In order to make an optimum design for a novel hybrid journal bearing considering fluid/solid interaction, cavitation and oscillation characteristic of journal to reduce friction force and apply under high speed condition, an approach combining fluid-structure interaction with an improved orthogonal experiment method was discussed. Cavitation was analysed based on a phase change model. Sensitivity study was performed firstly to determine design variables. The length, width and deepth of shallow recess and the width of deep recess had significant effects on friction force. The influence of the width of deep recess on oscillation characteristic of journal was maximum. The improved result of optimisation was very obvious and remarkable, the friction force decreased by 47.3%. This presented approach can be a suitable and useful tool for optimum design of rotor-bearing system.