Analyses¶
Common feature¶
Rereduction¶
Model order rereduction is a specific feature of MORe. It allows MORe to perform the analyses faster by dropping parametric dependencies. This means, that the number of degrees of freedom is reduced during the analysis to the smallest amount necessary.
The default setting for the analyses allowing rereduction is true. You can unselect the feature by unticking rereduce systems. The following table lists the analyses that support the rereduction feature.
Analysis |
Physics |
|---|---|
Modal analysis |
Mechanical |
Stiffness analysis |
Mechanical |
Frequency response analysis |
Mechanical |
Transient analysis |
Mechanical |
The speedup factor using the rereduction feature is shown in the following table. The times were measured using the the RMT-MORe model which is used in our courses.
Analysis |
Without rereduction |
With rereduction |
Speedup factor |
|---|---|---|---|
Frequency response analysis |
30s |
3s |
10 |
Modal analysis |
7s |
1.5s |
4.67 |
Transient |
433.15s |
44.5s |
10 |
This gain in speed, however, has some drawbacks. Parametric dependencies are lost, which means the analyses can only be performed at one specific operational point. Furthermore, no profile evaluation can be performed in the postprocessor.
Linearize link properties¶
With the implementation of non-linear link properties MORe is able to simulate effects depending on the state of the links, such as displacement or velocity. This increases the complexity of the system that has to be solved in the analyses. Tick the linearize link properties box to omit the non-linearities in the simulation, which will decrease the simulation time. However, the non-linear effects will not be calculated.
Hysteretic damping¶
More information about damping can be found here: https://www.more-simulations.ch/docs/user_help/composition/link_properties/link_properties.html.
The following analyses support hysteretic damping for links. Untick the use equivalent damping box to use hysteretic damping. If the box is ticked, the equivalent viscous damping will be used for the analysis.
Analysis |
Physics |
|---|---|
Modal analysis |
Mechanical |
Frequency response analysis |
Mechanical |