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This is Fig. 66 from the 2012 GENOPT paper. This figure shows an enlarged view of part of the same buckling mode as that displayed in the previous slide.
There are 31 nodal points in each segment of the model, which is the nodal point density specified in the “balloon” software, SUBROUTINE BOSDEC (NODSEG = 31) for optimization.
In this case BIGBOSOR4 produces a general buckling eigenvector that has a significant component of local spurious “zig-zag” buckling modal displacement in every segment except those straight segments in the outer wall the thickness of which is TFOUTR and those straight segments in the inner wall the thickness of which is TFINNR.
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