Version 12/2017 of the MESYS Software is now available under Downloads.

Extensions to general program features

A COM-interface was added to the software, which allows remote control of the calculations using other programs. It can be used for example to post-process bearing loadings calculated by time integration in multi-body-system programs.

The software documentation is finally available as context sensitive help allowing faster access of information to certain inputs. An online version of the help is available here. Graphics can be frozen inside the program to allow comparisons and a copy option using the system clipboard was added for graphics for quicker transfer into other documents. The default format for reports is now PDF/A instead of standard PDF.

Version 12/2017 is available under macOS too.

Bearing calculation software under macOS

Extensions to the bearing calculation software

An addition option for roller crowning was added to the bearing calculation software. Until now a tangential crowning was available. Now on customer request, a crowning with a non-tangential arc is available too.

The track roller calculation with elastic outer ring requires the geometry of the outer ring. Now a proposal of the geometry can be generated by the software and the geometry can be imported using a XLS-file with point data. In case of a track roller calculation with load spectra now the axial position and the angle of each load can be varied within the load spectra.

The selection for tolerances and the tolerance report now also include a probable minimum clearance and a probable maximum clearance in addition to minimum, mean and maximum values. Based on the assumption of normal distributions for fits and bearing clearance, the resulting probable values are calculated and can be selected for the calculation of the load distribution and life.

For the calculation of interference fits according to the thick ring theory two options for the race diameter are available now. Both options can be compared with axisymmetric FEA results using a new diagram.

Radial expansion of inner race compared with axisymmetric FEA results


The radial expansion of bearing rings because of rolling element loads can be considered. In version 12/2017 not only the expansion of the bearing rings as before, but also the influence of the shaft or housing is considered. This has an effect in case of thin shafts or housings.

The SKF bearing database was updated and now includes information about bearing availability.

Extensions to the shaft calculation software

In addition to modal reduction of imported CAD geometry for fixed housings now the modal reduction is also possible for free 3D elastic parts like planet carriers or shafts. So far, the modal reduction does not include gyroscopic matrices, therefore there is still a limitation for high speed applications.

Parametric planet carrier with static and modal reduction (video of torsional mode)

All bearings types are now drawn with separated inner and outer rings in 2D and 3D-views of the shaft calculation. The animations for 3D mode shapes therefore allow a better understanding of the movement in the bearings.

Supported bearing types

For shaft systems in addition to connections by gears or belts a generic coupling connection with a user defined ratio is available. This allows to consider hydraulic or electric connections between subsystems.

Many small extensions had been added like splitting or merging shafts, applying options to all rolling bearings in one operation or adding comments to load spectra elements.

Extensions to the calculation of axial-radial-roller bearings

The FEA-based software for axial-radial-roller bearings now allows contact between parts. This can be used to consider a gap within a bolted joint.