Name

b2convert_from_nas (B2000++ Pro) — From a Nastran® BDF file create an MDL file

Synopsis

b2convert_from_nas [options] BDF_FILENAME MDL_FILENAME

Description

The b2convert_from_nas program is available in B2000++ Pro. It reads a Nastran® bulk data deck file (BDF) and creates an MDL file. The b2convert_from_nas program is launched from a shell.

Arguments

BDF_FILENAME

The Nastran® bulk data deck file to be read. BDF_FILENAME must exist.

MDL_FILENAME

The B2000++ MDL file to be written. If MDL_FILENAME already exists, it is overwritten.

Options

-h

Print a one-line help message and exit.

-help

Print a help message and exit.

-verbose

Verbose output. The scaling factors for the different quantities are printed.

-permute=[X|x|Y|y|Z|z]

Specifies permutation for the x-, y-, and z-axes. Three characters must be specified. The first character indicates which direction is mapped onto the x-axis. The second character indicates which direction is mapped onto the y-axis. The third character indicates which direction is mapped onto the z-axis. A lowercase characters indicates a negative direction, while an uppercase character indicates a positive direction.

Thus, -permute=XYZ means no permutation. To swap y- and z-axes, specify -permute=XZY. To rotate around the x-axis by -90 degrees, specify -permute=XZy.

-bdf-units=SYSTEM

Specify the unit system of the BDF file, where SYSTEM is one of 'lb-in (force)', 'SI', 'mm-t-s'.

-mdl-units=SYSTEM

Specify the unit system of the MDL file, where SYSTEM is one of 'lb-in (force)', 'SI', 'mm-t-s'. The scaling factors for the different quantities are determined automatically.

-scale-force=factor

Scale forces (e.g. FORCE1 and FORCE2 cards).

-scale-length=factor

Scale lengths (and derived quantities such as areas, volumes, and area moments).

-scale-mass=factor

Scale masses.

-scale-modulus=factor

Scale elastic and shear moduli.

-scale-moment=factor

Scale moments/torques.

-scale-density=factor

Scale densities.

-stabilize-beam-properties=factor

Stabilization factor for beam cross-section properties with zero area moments, torsion moments, etc., to avoid singularities. Default is 1e-6.

-no-shear-panels

Replace cshear/pshear by cshell/pshell.

-ignore-wtmass

Do not take into account the WTMASS parameter if specified in the BDF file.

Additional information

Only a subset of the bulk data deck entries is parsed. When unknown entries are encountered, the converter will print a list of all unknown entries at the beginning of the MDL file.

Any other problems encountered during the conversion process will also be reported at the beginning of the MDL file.