Bearing AT has a built-in catalogue of many bearings, and after selecting any bearing based on the internal diameter, the macro-geometry of the selected bearing is automatically calculated.

In Create mode you define a new property file by selecting one of available bearings from catalogue and calculating the macro-geometry by using Compute geometry button. This can be also done by entering the basic bearing dimensions (inner diameter, outer diameter, bearing width) and the static load rating.

In Edit mode is possible to load already existing property file and change the macro-geometric parameters of the bearings manually. How to proceed not only in the Edit mode case, is explained in the following steps in Bearing AT Online Help. Meaning of all required input parameters is explained below.

In both modes, it is possible to make a preview of bearing macro-geometry. There are also sketches, which show the meaning of each macro-geometry parameter.

This dialog box allows you to create cylindrical roller bearing property file (*.rpf) or modify existing one. There are geometrical data of the bearing stored in this file. This preprocessing step will automatically generate FE meshes of bearing inner and outer ring and rolling element and submit Nastran computation (SOL101) which provides intermediate results (*.PCH) required for contact preprocessing.

 

 

Two types of inner ring are currently supported for cylindrical roller bearings: NU and NJ. The difference between them is noticeable in the Inner Ring card. In the case of the NJ bear class, the inner ring card contains two additional parameters that define the diameter of the inner collar: Inner Collar Diameter (d_col_ir) and the width of the inner collar: Inner Collar Width (c_w_ir). In the case of NU bear class these two parameters are not present on the Inner Ring card.

In order to make contact preprocessing possible, each bearing class requires to have inner ring defined. In case of Without inner ring bearing class a rolling element makes contact pair with shaft part, which is for the purpose of contact computation in Bearing AT represented by inner ring geometry defined in the Inner Ring tab of the dialog box. Neither inner ring geometry nor inertia will be applied in Adams model once a bearing element is created with previously mentioned bearing classes.

 

 

The Inner Ring Mass and Outer Ring Mass card allows you to define the mass of the inner and outer ring, respectively, based on the Geometry and Material Type or by specific User Input. In the former case the mass, center of mass and inertia tensor is computed later by the mesher based on FE mesh volume. In the latter case enter all required data in current model units. In either case, inertia data are written to the *.rpf file and applied to the bearing element once created in Adams.

 

 

You can define different materials for rolling elements, inner ring and outer ring. When defining via the Material Type option, you can use predefined materials from the library or you can create a new one. Using the User input option, it is necessary to enter values of Young’s Modulus, Poisson’s Ratio and Density appropriate for the material you require.

 

 

You can control FE mesh division and number of load cases defined over contact surface of rolling elements, inner ring and outer ring.