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MESYS Calculation Software

There are some settings available for the 3D-elastic parts.

3D-elastic-part-general

On page "General" the material, speed, temperature can be defined. The color for the part and the mesh can defined which is used in the standard 3D-geometry views. A change of material required a new reduction for the part.

3D-elastic-part-settings

On page "Settings" the number of mode shapes used for modal reduction can be defined. A larger number increases accuracy but required more memory and reduction time. Usually a value larger 20 should be used. The maximum frequency is shown on page "Information". This frequency should be larger than the maximum frequency that is of interest for the system.

An approximation order for elastic bearing rings and elastic gears can be defined here. The transverse approximation order for gears of 2 means a parabola is used for transverse deformations. A factor of 1 would only use a straight line. For gears with a large face width larger orders than 2 might be appropriate.

The reduction of the 3D-elastic parts lead only to mass and stiffness matrices. No gyroscopic matrix is considered. As approximation the polar inertia can be considered a gyroscopic matrix on the connected reduced nodes on the x-axis. The polar inertia will be distributed equally on all available nodes if the option"Consider gyroscopic matrix on connected nodes" is set.

The option "Consider centrifugal expansion" will add the effect of centrifugal expansion to the part. This is only active for 3D-elastic shafts.

The option "Consider bearing ring stiffness" will add the stiffness of the bearing rings to elastic bearings. If the ring is already included in the 3D-elastic part, this option should be disabled. Using "Consider bearing ring contact" will add a contact model between bearing ring and part. Then the fitting calculation will not directly set an operating clearance of the bearing, but the fitting will be influences by expansion or compression of the elastic parts. If the stiffness of the part is not uniform, there will be already a deformation of the bearing ring after mounting.

Activating the option "Cutaway in 3D" will lead to a cut view in the 3D-view for the system like the same setting available for shafts.

A change of the numeric values on the settings page will lead to an update of the reduction, while changing the check boxes won't require an update of the reduction.

The button "Remesh" allows to remesh the part. Either to change the mesh size or the type hexahedral/tetrahedral. Note that this is a remesh of the previous mesh, generally it would be better to do a new import of the CAD file in case the mesh size is changed. "Scale mesh" allows to apply a scale factor on the mesh. This could help, in case the unit system of the import was not correct. The use of either button requires a new reduction of the part.