Hello,
I tried to use the APDL command to extract the mass and stiffness matrices, then solve them linearly as an Eigen value problem in MATLAB to get the modal matrix (combination of Eigen vectors), but there was a serious problem: the corresponding Eigen values (which are supposed to be natrural frequencies) don't match totally with those given by the ANSYS modal analysis. I think this problem needs some intention. It is a really serious one.
Regards
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