Hello again, all. I’m trying to optimise my structure using galapagos/octopus with karamba, but at the moment I’m having serious problems with the karamba bit.
I’m trying to calculate the deflection of the slab using the AnalyzeThi component, and using that value as a factor for my optimisation. However, after I added horizontal ties to my model, it’s been returning insanely high values of displacement (like 9.44 e9 metres). After fiddling with it more I ended up with a failed model and this error message:
- There are 86 rigid body modes in the system. This means some parts can move freely without causing deformation.
Try to use the ‘Eigen Modes’-component and activate the display of local coordinate axes: The first eigen-mode will be the rigid body motion.
If this does not help, check whether you have a pinned support directly attached to a hinge. A hinge introduces an extra node which may cause the problem.
When analyzing a flat shell structure one has to lock the rotation perpendicular to the plate in at least one node.
But I have no idea how to use the Eigen Modes component to fix it. I tried removing duplicate points, but nothing much seems to have changed.
Thanks in advance, everyone.