In analysis of cables via robot, a pretension value has to be inserted and then iterations have to be made. I was wondering if there was a way to predetermine a good judgement for the pretension to be used for the cable which eliminates the need for doing many iterations. This may not be a pure robot question but I would appreciate the help nevertheless.
Structural Design Engineer
MZ & Partners Engineering Consultancy
For preliminary analysis of models containing many cables it is much more efficient to define cables not by pretension but by elongation or length:
In such case when specifying for instance zero relative elengation the unloaded cable length equal to the distance of end nodes will be used. For instance +0.01 relative elongation corresponds to unloaded cable length 1 percent longer than the distance of end nodes.
In case of defining cables by pre-tension it is sometimes very difficult to predict what unloaded cable lengths may be necessary to obtain it and moreover there is a risk that equilibrium and convergence is not possible with reasonable lengths of cables. See:
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