乱流軸受の安定性に及ぼすジャーナル壁面せん断応力の影響 : 第1報,無限小幅軸受理論による検討

概要

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In this paper, the dynamic behavior of a perfectly rigid rotating shaft supported by hydrodynamic journal bearings is examined theoretically by considering the combined effects of turbulence and fluid shear stress acting on the journal surface. In the theoretical analysis, the fluid film reaction forces in the normal and tangential directions, which include the effect of fluid shear stress on the journal surface, are derived based on the turbulent lubrication theory under the assumption of a short bearing. Applying the Routh-Hurwitz stability criterion [Hashimoto, et al., Trans. ASME, J, Trib., 109 (1987), 307] to the equations of motion for the rotor-bearing systems, the whirl onset velocities are obtained. Moreover, the journal center trajectories are calculated by the Runge-Kutta method. From the numerical results, the effects of fluid shear stress on the stability of turbulent journal bearings are clarified.
一般社団法人日本機械学会の論文
1994-12-25