Abstract
In this study we make clear dynamic characteristics of a hydrostatic gas journal bearing in consideration of hydrodynamic effect. Trends of diagonal terms of stiffness matrix K_<xx> and damping matrix B_<xx> mainly depend on a feeding parameter Γ and don't so depend on a bearing number Λ which corresponds to rotating speed Ω. On the other hand, trend of cross terms of stiffness matrix K_<xy> and damping matrix B_<xy> mainly depend on Λ. We can stabilize a rotor supported with the hydrostatic gas journal bearing by choosing the optimum feeding parameter Γ in order to increase the stiffness K_<xx> and the daming B_<xx>.
