pyyeti.nastran.op2.OP2.rdop2gpwg

OP2.rdop2gpwg()[source]

Read the OGPWG data block, which contains model mass properties.

Returns:

  • dictionary or None if OGPWG not in file

  • m66 (2d ndarray) – 6x6 rigid body mass matrix

  • s (2d ndarray) – The 3x3 transformation from principal mass directions to the basic csys. This is usually an identity matrix.

  • mass3 (1d ndarray) – A length-3 vector of the model’s mass in each principal mass direction.

  • mass (float) – The model’s mass.

  • cg33 (2d ndarray) – The 3x3 center of mass matrix.

  • cg (1d ndarray) – A length-3 vector of the model’s center of mass.

  • Is (2d ndarray) – The model’s 3x3 inertia matrix at the CG using the principal mass directions.

  • Iq (2d ndarray) – A length-3 vector containing the model’s inertia matrix using the principal axes.

  • q (2d ndarray) – The 3x3 transformation from the basic csys to the principal axes.