LS Dyna

LS Dyna

LS-dyna perturbation_node

    • minchunh
      Subscriber

      Hello,

      I'm using perturbation_node type 3 (read perturbations from a file) to define a perturbation over the model. Here's the file I modified the output data from implicit_buckle analysis:

      *KEYWORD

      $TIME_VALUE = 3.78E+01

      $STATE_NO = 1

      $Output for State 1 at time = 37.7669

      $NODAL_DISPLACEMENT

      $ NID x-disp

      1 -1.44E-02

      2 -1.70E-01

      3 9.66E-02

      4 3.23E-07

      5 -9.61E-02

      6 -1.43E-07

      7 2.93E-07

      8 -9.66E-02

      9 -1.25E-01

      10 0.00E+00

      11 1.40E-01

      12 9.66E-02

      13 1.64E-06

      14 0.00E+00

      15 -2.83E-06

      16 1.18E-06

      17 1.18E-06

      18 0.00E+00

      19 1.70E-06

      20 3.78E-08

      21 -1.70E-06

      22 0.00E+00

      23 3.78E-08

      24 6.86E-07

      25 -1.01E-02

      26 -1.81E-01

      27 0.00E+00

      28 -4.71E-03

      29 1.16E-06

      30 -9.66E-02

      31 5.10E-02

      32 1.51E-06

      33 1.16E-06

      34 -3.73E-06

      35 -1.76E-02

      36 1.76E-02

      37 0.00E+00

      38 -1.40E-01

      39 0.00E+00

      40 1.76E-02

      41 -6.30E-02

      42 -3.45E-02

      43 5.09E-02

      44 3.23E-07

      45 1.70E-01

      46 -6.74E-02

      47 -5.09E-02

      48 0.00E+00

      49 3.48E-02

      50 1.01E-02

      51 -3.48E-02

      52 1.58E-06

      53 0.00E+00

      54 -3.73E-06

      55 -5.10E-02

      56 7.07E-07

      57 6.61E-02

      58 4.71E-03

      59 9.61E-02

      60 -5.10E-02

      61 6.86E-07

      62 6.63E-07

      63 -1.70E-01

      64 -1.01E-02

      65 0.00E+00

      66 -3.48E-02

      67 8.38E-08

      68 1.74E-06

      69 1.74E-06

      70 3.45E-02

      71 1.51E-06

      72 0.00E+00

      73 1.25E-01

      74 4.71E-03

      75 -9.61E-02

      76 3.48E-02

      77 -3.45E-02

      78 6.30E-02

      79 0.00E+00

      80 -1.76E-02

      81 2.19E-08

      82 1.17E-01

      83 6.63E-07

      84 0.00E+00

      85 0.00E+00

      86 1.17E-06

      87 -6.62E-02

      88 6.30E-02

      89 1.17E-01

      90 5.10E-02

      91 9.61E-02

      92 -6.62E-02

      93 1.01E-02

      94 -4.07E-06

      95 0.00E+00

      96 0.00E+00

      97 0.00E+00

      98 -1.40E-01

      99 1.58E-06

      100 -4.71E-03

      101 1.44E-02

      102 2.62E-07

      103 -7.18E-07

      104 1.40E-01

      105 -1.70E-06

      106 5.09E-02

      107 -1.17E-01

      108 0.00E+00

      109 -5.09E-02

      110 -6.30E-02

      111 6.61E-02

      112 0.00E+00

      113 0.00E+00

      114 -1.43E-07

      115 7.07E-07

      116 7.19E-07

      117 6.74E-02

      118 -2.83E-06

      119 3.45E-02

      120 8.38E-08

      121 4.05E-08

      122 -1.17E-01

      123 2.41E-07

      124 -7.18E-07

      125 1.44E-02

      126 -1.44E-02

      127 0.00E+00

      128 2.19E-08

      129 2.62E-07

      130 1.18E-06

      131 1.55E-06

      132 4.05E-08

      133 2.41E-07

      134 2.93E-07

      135 1.55E-06

      136 1.17E-06

      137 1.81E-01

      138 7.19E-07

      139 1.70E-01

      140 0.00E+00

      141 1.58E-06

      142 1.18E-06

      143 1.58E-06

      *END

      The file works successfully when using an older solver, e.g. R8.0.0 but the analysis terminates with an error as follows when using the solver R11.1.0:

    • Imtiaz Gandikota
      Ansys Employee
      I don't think the format has changed. Please try a different version or import the file into LSPP as user-defined nodal results to check if its read correctly.
      You can also use csv format for the values (1,-1.44E-02).
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