PARAM, DISIFMCK

Bulk Data Entry Skip indefinite mass matrix check.

Parameter Values Description
DISIFMCK <YES, NO> For vibrational eigenvalue analysis, the mass matrix must be positive semi-definite. However, if this is simply caused by numerical ill-conditioning, then PARAM,DISIFMCK may be used to skip the indefinite mass matrix check.
YES
Skip indefinite mass matrix checking.
NO (Default)
Perform indefinite mass matrix checking.