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Recent content by nd308

  1. nd308

    Optimisation run with statics and buckling causing constraint error

    Hi, I am trying to optimize a wing for weight with regard to three very simple sub-cases: SUBCASE 1 ANALYSIS = STATICS LOAD = 103050 DESSUB = 6 SUBCASE 2 ANALYSIS = STATICS LOAD = 103060 DESSUB = 6 SUBCASE 3 ANALYSIS = BUCK METHOD = 10...
  2. nd308

    Nastran Normal Modes Analysis - getting the same modes?

    Thanks for all the help chaps, it works now, turns out there was a pretty major problem with the QUAD element definitions in the entire model.
  3. nd308

    Nastran Normal Modes Analysis - getting the same modes?

    I am doing a simple normal modes analysis on a high AR wing which has been meshed and verified. All I want to do is compared the normal modes of the clean wing to a wing with added point masses (added through CONM2 elements). For some inexplicable reason I am getting exactly the sames modes...
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