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 it is possible to load already existing property file and change the macro-geometric parameters of the bearing 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 axial cylindrical roller bearing property file (*.rpf) or modify existing one. There are geometrical data of a 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.

 

 

To enable contact preprocessing, it is necessary to define the dimensions of the shaft ring geometry for each bearing class. For the Rollers and cage assemblies bearing class, the rolling element makes contact with a part of the shaft, which is defined as the shaft ring geometry in the Shaft Ring tab of the dialog box for contact computation in Bearing AT. It should be noted that neither the shaft ring geometry nor the inertia will be applied in the Adams model once a bearing element is created with the aforementioned bearing classes.

 

In order to enable contact preprocessing, it is necessary to define the dimensions of the body ring geometry for each bearing class. For the Rollers and cage assemblies bearing class, the rolling element contacts a part of the body, which is defined as the body ring geometry in the Body Ring tab of the dialog box for contact computation in Bearing AT. It should be noted that neither the body ring geometry nor the inertia will be applied in the Adams model once a bearing element is created with the aforementioned bearing classes.

 

The Shaft Ring Mass and Body Ring Mass card allows you to define the mass of the shaft and body ring, respectively, based either 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 on 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 when created.

 

 

You can define different materials for rolling elements, shaft ring and body 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.

Note that in either case the Young’s modulus, Poisson’s ratio and density of chosen material will be stored in the property file.