In hall 25 stand A21 of Hannover industry fair MESYS AG will present its new version of shaft and bearing analysis software. The bearing analysis software allows the calculation of bearing load distribution and bearing life according ISO/TS 16281 and is integrated in a shaft system calculation with additional possibilities like strength calculation for shafts, modal analysis and interfaces to gear calculation programs.
The main new features in bearing analysis are:
- Additional bearing types: double row tapered roller bearing and axial tapered roller bearing are supported now. In total 24 types are supported.
- The parameter variation allows the output of multiple results of same dimension in the same diagram. Therefore, comparison of nominal and modified life can be done using one diagram.
- The parameter variation is extended to a statistical variant. Multiple inputs can be defined using range and statistical distribution and outputs are shown with distribution including minimum, maximum and mean values. An example could be the parallel variation of clearance, fitting, temperatures and tilting angles to see the resulting range of contact stress and bearing life.
- Deformations of rings can be defined by the user. If deformations are known by means of FE analyses, they can be imported to evaluate their influence on bearing life and contact stress.
For the shaft calculation the following main features are added:
- New load element: pulley.
- New support element: hydrodynamic plain bearing.
- Additional options for graphical display, like cutaway view or animation of rotation.
- Load spectra can now include the position of forces.
- External accelerations of the system can be considered as inertia forces.
- Centrifugal forces on planet shafts in planetary gear stages are taken into account
- The parameter variation like for the bearing analysis. This allows the user to vary loading, bearing clearances or offsets, temperatures and more. A statistical variant is added as well.
- Result tables can now be exported as XLS.
- The shaft calculation now also supports US units for inputs and outputs.
As a small example of the statistical evaluation a simple shaft with a ball and a roller bearing is used. Both bearings have the same nominal reference life using mean clearance, no misalignment of shaft and nominal load.
We now can do a variation of clearance within bearing tolerances, consider misalignment of one bearing up to 0.1mm and use a tolerance for loading. For all cases a normal distribution is used with three times standard deviation fitting into the tolerance field.
The number of calculations can be specified by the user. A first insight is already possible with a smaller number of calculations, but for nice-looking curves several thousand calculations are needed. The probability for the results of basic reference life were calculated with 20000 load cases, which took about 12 minutes on a standard desktop computer. Like for the initial calculation the maxima of the curves are close to each other, but the variance for the roller bearing B2 is much larger. The reason is the misalignment of the shaft, which has a larger influence on the roller bearing. The report will also show minimum, maximum, mean value and standard deviation for each selected result.
The default version of parameter variation is helpful to visualize the influence of one parameter on one or multiple results. The statistical version can be used if the influence of multiple uncertainties should be evaluated. Instead of manually checking multiple parameters an automatic calculation of the whole ranges can be done. In order to understand the reasons behind the results it will still be necessary to carry out additional evaluations, but the software shows the ranges of results that have to be expected.
New module for ball screw calculations
In addition to the shaft and rolling bearing calculation software a new calculation of load distribution for ball screws is available now. Life is calculated from load distribution analogously to ISO/TS 16281. This allows the consideration of radial and moment loads in addition to axial loads. As in the other programs, an automatic parameter variation is available as well.
Most users of the bearing calculation software are bearing manufacturers, others use the shaft system calculation for gearbox design and modal analysis. The software is currently used in 22 countries on four continents. A demo version is available under downloads.
For further information or a free test version please contact
+41 44 4556800