How do I create non-linear springs in Simulation?
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You can't do this directly but this can be done with the help of command snippets. The database attached to this article contains three models: 1) All linear springs. Springs are new at 11.0 but linear only. 2) As above but with a command snippet added for each spring that makes it non-linear and defines the curve Pro's - minimum of APDL - Can have different curves for each spring. Could use arg1 etc for keyboard entry. Note that you are limited to 9 inputs so only 4 segments directly. - You can see the springs and control where they go. Con's - manual insertion of springs - can be slightly time consuming. 3) Same model as before but all APDL driven. You need to define the ring of nodes via a named selection on a line and also define local CS's with a manual ANSYS number. Same snippet is used twice - once of each end. Pro's - If this is a spider and all springs are the same this is easy to use - Number of springs, the curve etc can be keyboard driven outside the snippet Con's - Assumes a spider and all springs are the same. - Does require more knowledge of APDL than 2. - Cannot see the springs inside Simulation. In both cases the spring probes will not work. You can use the APDL script to use /post26 to export the force deflection curve. |
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