Dynamic Characteristics for Magneto-Hydrodynamic Wide Slider Bearings with an Exponential Film Profile

On the basis of the magneto-hydrodynamic (MHD) thin-film lubrication theory, the dynamic characteristics of wide exponential-shaped slider bearings with an electrically conducting fluid in the presence of a transverse magnetic field are theoretically investigated. Taking into account the transient squeezing motion, the MHD dynamic Reynolds-type equation is derived from the continuity equation and the MHD motion equations. A closed-form solution for the steady film pressure and load-carrying capacity and the dynamic stiffness and damping coefficients are obtained. From the results obtained, the presence of externally applied magnetic fields signifies an enhancement in the film pressure. On the whole, the applied magnetic-field effects characterized by the Hartmann number provide a significant increase in values of the load-carrying capacity, the stiffness coefficient and the damping coefficient as compared to the non-conducting-lubricant (NCL) case. These improvements of bearing dynamics are more pronounced with increasing Hartmann numbers and decreasing minimum film thicknesses. To illustrate the use of the present study, a design example is guided. For engineering application, numerical results are further provided in the Tables.

並列關鍵字

magneto-hydrodynamic characteristics ； exponential film ； slider bearings ； stiffness coefficients ； damping coefficients

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