MEDVIC 연구실

 In "hydrostatic bearings", the bearing surfaces are separated by a fluid film mainstained by a pressure source outside the bearing.

 So, Hydrostatic bearing can get advantage in some cases.

1. Extremely high load-carrying capacity at low speeds.

2. Extremely low friction (No friction during starting and stopping)

3. High positional accuracy in high-speed, light-load applications

Upper advantages can not be established when hydrodynamic bearings are considered.

 As the power of small oil-free turbomachinery increases, the load-carrying capacity of thrust bearings supporting axial forces becomes increasingly important.

 However, in the case of hydrodynamic bearings, under low-speed and high-load conditions where fluid film pressure is insufficiently formed, as well as during start-up and shut down, friction between the bearing and the bearing runner leads to reduced bearing lifespan.

 To solve these issues, the performance of a pressurized gas foil thrust bearing, which can provide a solution, was evaluated.

 Fig. 3&4 shows analysis of the minimum film thichkness of the Sloped Recess Type and Stepped Recess Type, respectively, while changing the rotor speed 0 to 100 krpm.