Construction of Stiffness and Flexibility for Substructure-Based Model Updating

Table 1

Accuracy of the rigid body eigenvalues and the residual flexibility of the first substructure.

	With the proposed well-conditioned eigenequation		With Moore-Penrose pseudo-inverse for rank-deficient matrix		With a small shift for rank-deficient matrix
	Eigenvalue	Inverse of eigenvalue	Eigenvalue	Inverse of eigenvalue	Eigenvalue	Inverse of eigenvalue
Rigid body modes	1.00	1.00	1.48𝐸−09	6.74𝐸+08	0.1	10
	1.00	1.00	4.62𝐸−09	2.17𝐸+08	0.1	10
	1.00	1.00	1.64𝐸−08	6.07𝐸+07	0.1	10
Error of residual flexibility	0.00%		0.30%		1.60%