Transient analysis¶
Perform a mechanical transient analysis. Two different load cases can be selected. Either a force that changes over time is applied. Furthermore, also position or velocity command values can be used to simulated.
Loads¶
Open the load case container, where load cases can be defined (CTRL+K on load case to configure).
Configure selected load¶
Define and configure the load case here.
Link¶
Define at which link the load is applied.
Force/Moment¶
Define the direction of the force/moment. By entering 1 in a corresponding direction means that a force/moment is applied in this direction scaled by 1.
| Direction | Force/Moment |
|---|---|
| u | Force in axial direction |
| v | Force in transversal direction |
| w | Force in normal direction |
| ru | Torque around axial direction |
| rv | Moment around transversal direction |
| rw | Moment around normal direction |
Add link load¶
Add a new link load which then can be configured.
Add link spacer¶
Add a displacement between the master and slave interface in the link.
Add component acceleration¶
Adds a component acceleration load case. For example, an acceleration of -9,81 m/s2 in w-direction defines the gravitational force to the selected component.
Add composition acceleration¶
Add a composition acceleration. The acceleration is used for the whole composition and not for a component only, as in add component acceleration. For example, an acceleration of -9,81 m/s2 in w-direction defines the gravitational force to the composition.
Hint¶
By right-clicking on the number in the first column, the load can be deleted.
Solver configuration¶
Initial/End time¶
Define the start and end time of the transient simulation.
Solver type¶
Two different solvers are present. The default solver is radau.
Numerical parameters¶
Define the numerical properties of the solver.
Adding transient load data¶
By right-clicking on the transient analysis and by clicking on add load data the time variant load data can be defined. Select the desired load case in the Entity field. This load case has to be defined in advance. There are two ways of importing transient load data. For simple transient load cases the using the table more convenient. For more complex load cases use the import.
Using table¶
| Step | Action |
|---|---|
| 1 | Click on Table |
| 2 | Right-click into newely opened table and click on Copy header |
| 3 | Open Excel and paste the header in a new sheet |
| 4 | Define the time steps in the Time column |
| 5 | Define the values at every time step in the Value column |
| 6 | Copy the whole table including the header Time and Value |
| 7 | Right-click into the MORe-Table and click on Paste |
| 8 | Click on Plot to check if table was copied correctly |
Additionally, the number in Number of rows can be changed. This allows to directly define the transient load data in the table.
Important: The headers of the table imported from Excel have to match the ones given in the MORe-Table.
Using import¶
| Step | Action |
|---|---|
| 1 | Open matlab and define a vector of name time or var which stores the time steps |
| 2 | Define a vector that stores the load data for every time step |
| 3 | Select both vectors and save them in a .mat file |
| 4 | Right-click on load_case_data and click on Import data |
| 5 | Select the .mat file |
| 6 | Click on Plot to check if table was copied correctly |
Important: In the .mat file there has to be a vector called time or var, otherwise the import will not work.
Start calculation¶
Start the calculation.