Short-Bearing Hydrodynamic Oil Film Thickness (Classical Reynolds Approximation) calculator

Quick Answer

Calculate Short-Bearing Hydrodynamic Oil Film Thickness (Classical Reynolds Approximation)

Result Interpretation

Short-Bearing Hydrodynamic Oil Film Thickness (Classical Reynolds Approximation) calculator computes Minimum oil film thickness in m using the defined engineering formula and the input values provided. Minimum oil film thickness is expressed in m. No universal acceptance threshold is defined by this calculator.

Worked Example

Verified calculation

Given:

Dynamic viscosity of lubricating oil = 0.08
Journal rotational speed = 314.159
Bearing journal diameter = 0.05
Radial load per unit bearing length = 200000
Radial clearance between journal and bearing = 2.5E-5

Expected Result:

Minimum oil film thickness = 7.546E-6

Engineering Interpretation:

Under the given input conditions, the calculated result is: Minimum oil film thickness = 7.546E-6 m.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

minimum oil film thickness = 1.35 * pow((dynamic viscosity of lubricating oil * journal rotational speed * pow(bearing journal diameter, 2)) / (radial load per unit bearing length * radial clearance between journal and bearing), 0.5) * radial clearance between journal and bearing

Formula family: formula_rotating_bearing_oil_film_thickness_calculator_classical_reynolds_equation_approximation

Variables

Symbol	Label	Role	Description
viscosity	Dynamic viscosity of lubricating oil	INPUT	Dynamic viscosity of lubricating oil
rotational_speed	Journal rotational speed	INPUT	Journal rotational speed
diameter	Bearing journal diameter	INPUT	Bearing journal diameter
load_per_unit_length	Radial load per unit bearing length	INPUT	Radial load per unit bearing length
radial_clearance	Radial clearance between journal and bearing	INPUT	Radial clearance between journal and bearing
minimum_oil_film_thickness	Minimum oil film thickness	OUTPUT	Minimum oil film thickness

Calculation Steps

Enter the dynamic viscosity of lubricating oil in Pa·s.
Enter the journal rotational speed in rad/s.
Enter the bearing journal diameter in m.
Enter the radial load per unit bearing length in N/m.
Enter the radial clearance between journal and bearing in m.
Step 1: Compute minimum oil film thickness.
Read the minimum oil film thickness (m) from the results.

Engineering Summary

Calculate Short-Bearing Hydrodynamic Oil Film Thickness (Classical Reynolds Approximation)

Frequently Asked Questions

What does this calculator calculate?

The Short-Bearing Hydrodynamic Oil Film Thickness (Classical Reynolds Approximation) calculator estimates Minimum oil film thickness based on the input parameters you provide

Why is dynamic viscosity of lubricating oil important in this calculation?

dynamic viscosity of lubricating oil is used directly in the calculation of minimum oil film thickness. Its effect on the result depends on the complete formula and the values of the other inputs.. When you enter dynamic viscosity of lubricating oil in Pa·s, the calculator uses it in the engineering formula to compute the output

How should I interpret the result minimum oil film thickness?

The calculator outputs minimum oil film thickness in m. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Dynamic viscosity of lubricating oil (Pa·s), Journal rotational speed (rad/s), Bearing journal diameter (m), Radial load per unit bearing length (N/m), Radial clearance between journal and bearing (m). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment