Dear all, I have been using Timoshenko beams recently to model wind turbine blades in the QBlade code.
Overall the beams are performing great (both "standard" and FPM) and the prediction of internal blade shear forces is improved greatly. The anisotropic damping feature is also of great use and I could validate its correct functionality based on a very large blade design (22MW). I have a question regarding the functionality of *ChBeamSectionTaperedTimoshenkoAdvancedGeneric*, which does not seem to work as intended in my tests. The only way I can get the simulation to run is by using the same *ChBeamSectionTimoshenkoAdvancedGeneric *for both sections (sectionA and sectionB) of the tapered section. I tried to look into the issue that I am having, and it seems like during the evaluation of *ChBeamSectionTaperedTimoshenkoAdvancedGeneric*:: ComputeAverageSectionParameters() material values can turn out to be negative. I found at least the value *EImyy *to appear as a negative values my tests. I think that this happens during the "rotation" of *EIyy *onto the mass axis, as nothing "prevents" the values from turning negative (for certain angles of *mass_phi*), see below: double cosphi1 = cos(mass_phi1); double sinphi1 = sin(mass_phi1); double EImyy1 = EIyy1 * cosphi1 + EIzz1 * sinphi1; double EImzz1 = -EIyy1 * sinphi1 + EIzz1 * cosphi1; double GAmyy1 = GAyy1 * cosphi1 + GAzz1 * sinphi1; double GAmzz1 = -GAyy1 * sinphi1 + GAzz1 * cosphi1; I am not sure if this really is the problem, but wanted to ask if someone has experience using the tapered section and has some suggestions or tips on how to get it to work correctly. Thanks and best regards, David -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/3f7e36c8-e209-4839-b100-6591124b8477n%40googlegroups.com.
