*MATRIX CHECK

Check the quality of the generated stiffness and mass matrices.

This option is used to check the quality of the generated stiffness and mass matrices. It can be used only in matrix generation or substructure generation analyses.

This page discusses:

See Also
*MATRIX GENERATE
*SUBSTRUCTURE GENERATE
In Other Guides
Generating Matrices as a Linear Analysis Step
Generating Substructures

ProductsAbaqus/Standard

TypeHistory data

LevelStep

Optional parameters

ERROR

Include this parameter to treat any problem reported by the matrix check as an error.

REFERENCE NODE

Set this parameter equal to an existing node label to define the origin of the coordinate frame to use for the matrix check.

TOLERANCE

Set TOLERANCE=ON to modify the tolerance values to use for the matrix check.

Data line to modify the matrix check tolerances

First (and only) line

  1. Maximum acceptable ratio of the strain energy of a rigid body mode divided by the maximum element of the stiffness matrix. The default value is 1.0 × 10−10.

  2. Tolerance to check the consistency of the 3 × 3 upper-left submatrix of the projected 6 × 6 rigid body mass matrix. This submatrix must be a diagonal matrix with the mass on its main diagonal. The tolerance defines the maximum acceptable ratio of the square sum of all of the off-diagonal elements divided by the square sum of all elements. The default value is 1.0 × 10−3.

  3. Factor and divisor by which a diagonal element of the substructure stiffness matrix can deviate from the median value of its diagonal elements (only for a substructure generation analysis). The default value is 1.0 × 107.

  4. Factor and divisor by which a diagonal element of the substructure mass matrix can deviate from the median values of its main diagonal elements (only for a substructure generation analysis). The default value is 1.0 × 107.

  5. Minimum reciprocal 1-normalized condition number of the substructure stiffness matrix (only for a substructure generation analysis). The default value is 1.0 × 10−17.

  6. Minimum reciprocal 1-normalized condition number of the substructure mass matrix (only for a substructure generation analysis). The default value is 1.0 × 10−12.