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SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE

SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE

SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE

(OP)
Hi

I have a really strange problem. I'm making a model of a wind turbine that has shell elements for the tower a rigid body for the nacelle and beam element for the blades. The beam section property of the blades are generalized sections since I only had the mechanical properties of the airfoils. For the beam elements when I use a generalized section, for a simple static analysis, the solver gives a warning and says there are unconnected regions in the model and it also gives me warnings for all the 6 dofs of the blade nodes saying that they do not have stiffness. it does not converge from the first iteration how small the time increments are.
the properties I define for the generalized beam section are A, Ix,Iy, and J. and in the section assignment you have to choose before analysis and give E, and G. I tried giving it damping but it still did not work.
I changed the blade sections to a simple circular section and the model works with no errors. Has anyone worked with generalized beam sections? please let me know what the problem is.

RE: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE

If "numerical singularity" message(s) is/are showing up, one or more nodes are free to translate/rotate. Open the ODB and look for the warning nodes in Create Display Group.

http://www.eng-tips.com/faqs.cfm?fid=376

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