A Design Methodology for the Prediction of Squeeze Film Stiffness and Damping Characteristics in Hybrid Journal Bearings under Pulsatile Load Conditions.

Abstract

A theoretical investigation into the prediction and measurement

of squeeze film stiffness and damping for double hole entry

hybrid journal bearings has been undertaken together with a

review of previous work to identify critical bearing parameters.

The analysis used a partial differentiation of the Poiseuille and

Hagen-Poiseuille flow equations to develop a mathematical

model for the bearing squeeze film. A novel transfer function

between bearing displacement and load enabled bearing

stiffness and damping coefficients to be obtained from the

subsequent frequency response characteristics.

Parameter maps were developed from the model for both

stiffness and damping and show that the squeeze film stiffness

is a function of bearing clearance and squeeze film pressure and

is independent of fluid viscosity with damping being a function

of viscosity and clearance.