PARAM, MFILTER

Bulk Data Entry Defines a threshold for the mode tracking matrix to check eigenvector correspondence.

Parameter Values Description
MFILTER <0.0 ≤ real number ≤ 1.0>
Defaults:
  • If this parameter is included in the input file, but, no value is provided, then running the program will result in an error. In such cases a real value between 0.0 and 1.0 must be specified.
  • If this parameter is not included in the input file, then:
    • The value of PARAM, MFILTER is equal to 0.7 if PARAM, TRAKMETH is set to 0 or 1.
    • The value of PARAM, MFILTER is equal to 0.5 if PARAM, TRAKMETH is set to 2.
 This parameter defines a threshold for the mode tracking matrix to check eigenvector correspondence.

If an entry of the mode tracking matrix is greater than the specified threshold, the eigenvectors of previous and current iterations (corresponding to the row number and column number of the entry) are assumed to have correspondence.

If PARAM, TRAKMETH is set to 0, the mass matrix based cross-orthogonality criterion (CORC) is used to check for eigenvector correspondence, and PARAM, MFILTER is set to 0.7.

If PARAM, TRAKMETH is set to 1, the modal assurance criterion square root (MACSR) is used, and PARAM, MFILTER is set to 0.7.

If PARAM, TRAKMETH is set to 2, the modal assurance criterion (MAC) is used and PARAM, MFILTER is set to be 0.5.