E5053

E5053	WARNING: E5053	EXCESSIVE ORTHOGONALITY LOSS DETECTED FOR ONE OR MORE MODES
	Cause:	The extraction orthogonality loss for one or modes was greater than 0.01. Orthogonality of modes means each mode shape is unique and one mode shape cannot be obtained through a linear combination of any other mode shapes. A valid eigenvector should be orthogonal to all other extracted eigenvectors. If two eigenvectors were exactly orthogonal to each other, their orthogonality loss would be exactly zero. Orthogonality loss is measured using adjacent eigenvectors and should be less than 1.0E-6 for a valid solution. Like extraction error measure, usually the lowest mode has the smallest orthogonality loss and the highest accuracy. The opposite is true for the highest mode.
	Action:	For the subspace eigensolver: If an E5046 message is also given, increase the maximum number of subspace iterations permitted on the EIGRL Bulk Data entry. If an E5052 message is also given, add PARAM, EIGENSOLACCEL, OFF to the Model Input File Case Control Section. Otherwise, change the following parameters on the EIGRL Bulk Data entry one at a time in the order shown: Decrease the convergence tolerance. Increase the number of additional iteration vectors. Increase the number of desired roots. For the Lanczos eigensolver change the following parameters in the order shown: Decrease the value of PARAM, SPARSEITERTOL (default 1.0E-5). Decrease the convergence tolerance on the EIGRL Bulk Data entry.
	Remarks:	See Autodesk Nastran Reference Guide, Section 4, Bulk Data, for entry format, and Section 5, Parameters, for more information.