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  1. nhekipa

    NEGATIVE EIGENVALUES

    hello all I'm doing an 3D airplane's tail using beam elements and when I run job a error occur, in the message file is written that i´ve negative eigenvalues, how to solve this problem? thanks for the help
  2. nhekipa

    airplane's tail

    Hi, I'new here and I need to simulate an aiplane's tail composed with trusses and covered with an aluminum skin. Can any one help me? P.S. sorry me English
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