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- W1971682011 abstract "Purpose The purpose of the present study is to provide the dynamic characteristics of long journal bearings lubricated with couple stress fluids. Design/methodology/approach Based upon the micro‐continuum theory generated by Stokes, the dynamic Reynolds‐type equation governing the film pressure is derived to account for the couple stress effects resulting from the non‐Newtonian behavior of complex fluids. By applying the linear stability theory to the non‐linear equations of motion the journal rotor, the equilibrium positions and dynamic characteristics of the system are evaluated. Findings As compared to the classical Newtonian model, the effects of couple stresses signify enhanced stiffness and damping coefficients (including K XX , K XY , B XX and B XY ) at moderate values of the steady eccentricity ratio. Totally, as the rotor center operates at an eccentricity ratio about ε s ≤0.71, long bearings lubricated with couple stress fluids under small disturbance results in a higher stability threshold speed than that of the Newtonian‐lubricant case. Originality/value These findings provide engineers useful information in designing journal‐bearing systems." @default.
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- W1971682011 date "2005-02-01" @default.
- W1971682011 modified "2023-09-27" @default.
- W1971682011 title "Linear stability analysis of long journal bearings: couple stress fluid model" @default.
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- W1971682011 doi "https://doi.org/10.1108/00368790510575950" @default.
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