Advanced Features

Advanced Features

The advanced features allow you to include the turbulence effect, oil flooded, and types of boundary conditions in the circumferential direction. It also allows for the clearance discontinuity in the individual pad. The Advanced Feature must be checked (ON) for bearings with clearance discontinuity, such as Pressure Dam Bearing, Multi-Pocket Bearing, Step Bearing, and Taper Land Bearing. Also, for 3D pressure file plot, the Advanced Feature must be checked. Without Advanced Features, the pads are identical and no discontinuity in the bearing clearance for each pad. Therefore, only one (1) degree-of-freedom at each finite element node, that is, pressure is unknown at each finite element node without the Advanced Feature. However, with Advanced Features, the clearance can have sudden changes, such as pressure dam bearings and taper land bearings, therefore, three (3) degrees-of-freedom at each finite element node are assumed, that is, pressure, and pressure gradients in both axial and circumferential directions at each finite element node are unknown and are to be solved to accommodate the sudden changes in bearing clearance. With Advanced Features ON, the computational time will be greatly increased due to the increase of the degrees-of-freedom.

Although 3 types boundary conditions are provided, one should always use Reynolds boundary condition for design and practical purposes. Sommerfeld and half Sommerfeld (Gumbel) boundary conditions are only provided for educational and research purposes.

Pressure Dam Bearing

When the PocketAxL = Bearing Axial Length, pressure dam becomes a step as shown below:

Taper Land Journal Bearing, click here for more descriptions on taper land bearings.

For Taper Land Bearing, the undercut and taper length are normally specified in the design process, however, the arc center and arc radius are typically specified in the manufacturing drawings. A Tools button is provided for this conversion.