PARAM, EFFMAS

Parameter	Values	Description
EFFMAS	<Integer> Default = -1	When EFFMAS < 0, the modal participation factors and effective mass are not output for normal modes analysis. When EFFMAS > 0, the modal participation factors and effective mass will be computed and output to the .out file for normal modes analysis. They are computed using the following equations: $image\effmas.gif$
		where	$image\effmas2.gif$	is the matrix of eigenvectors.
			[m]	is the system mass matrix.
			[V]	is the objective function matrix. Six rigid body modes are used as objective function in normal modes analysis to obtain [PF] and [EFFMAS].
			[M]	is the diagonal modal mass matrix.