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The finite length pressure dam step bearing is analyzed neglecting step inertia effects, but including the effects of turbulence over the entire bearing surface. Load curves for sample step bearing designs are given along with stiffness and damping coefficients. Bearing stability threshold curves for various pressure dam bearing geometries are compared to plain journal, two-axial groove and grooved lower-half bearings. The optimum Sommerfeld number range for designing a pressure dam bearing to increase stability is S > 2.0. At S values of this order, the recommended film thickness ratio for favorable stability is between 3.0 and 6.0 with the step located at 145° in the direction of rotation from the positive horizontal axis.
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Nicholas et al. (1980) studied this question.
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