Research on load characteristics of squeeze-film air bearings based on fluid–solid coupling

In order to obtain the loading capacity and its variation of the squeeze-film air bearing, taking an air bearing as the research object, the structure model and the equivalent disk model of the squeeze-film air bearing are established. The modal analysis of the designed structure is carried out, and the mode of the bearing structure in the ultrasonic frequency range and the working squeeze frequency of the bearing are obtained. At the same time, the influence of air film thickness on the load characteristics of squeeze-film air bearing is analyzed by the fluid–solid coupling method. The relationship between air film thickness and loading capacity, and the relationship between contact area and loading capacity are obtained, respectively, by the above method. The results show that reducing the gap between the bearing bush and the rotor, increasing the amplitude of the bearing bush, and increasing the contact area between the bearing bush and the rotor can improve the loading capacity of the squeeze-film air bearing.